NCSM · NCS Multistage Holdings, Inc.

Pursuant to the Merger Agreement, at the Effective Time, Parent assumed each outstanding equivalent stock unit award of the Company (each, an "Assumed ESU") representing the right to receive a cash payment based on the fair market value of the shares of Common Stock, generally subject to the same terms and conditions as the Assumed ESU immediately prior to the Effective Time, except (i) the maximum value cap of each Assumed ESU in effect immediately prior to the Effective Time ceased to apply and (ii) each Assumed ESU was converted into an award covering a number of Parent Ordinary Shares equal to the product of (A) the number of shares of Common Stock subject to the Assumed ESU immediately prior to the Effective Time, multiplied by (B) 0.5537, rounded down to the nearest whole share.

Represents certain Assumed ESUs which were scheduled to vest on February 28, 2027.

Pursuant to the Merger Agreement, at the Effective Time, Parent assumed each outstanding equivalent stock unit award of the Company (each, an "Assumed ESU") representing the right to receive a cash payment based on the fair market value of the shares of Common Stock, generally subject to the same terms and conditions as the Assumed ESU immediately prior to the Effective Time, except (i) the maximum value cap of each Assumed ESU in effect immediately prior to the Effective Time ceased to apply and (ii) each Assumed ESU was converted into an award covering a number of Parent Ordinary Shares equal to the product of (A) the number of shares of Common Stock subject to the Assumed ESU immediately prior to the Effective Time, multiplied by (B) 0.5537, rounded down to the nearest whole share.

Represents certain Assumed ESUs which were scheduled to vest in two equal annual installments beginning on February 28, 2027.

Pursuant to that certain Agreement and Plan of Merger ("Merger Agreement"), dated May 31, 2026, by and among Weatherford International plc ("Parent"), Trinity Bell Sub, Inc. and NCS Multistage Holdings, Inc. (the "Company"), immediately prior to the effective time of the transactions contemplated thereby (the "Effective Time"), each share of the Company's common stock, par value $0.01 per share ("Common Stock"), was canceled and converted into the right to receive, at the Reporting Person's election: (i) 0.5537 ordinary shares, par value $0.001 per share, of Parent ("Parent Ordinary Shares"); or (ii) a combination of (A) cash in an amount equal to the product of (x) 0.1371 and (y) the closing price for the Parent Ordinary Shares on the Nasdaq Global Select Market on August 31, 2026, subject to a maximum cash election amount; and (B) 0.2392 Parent Ordinary Shares.

Pursuant to the Merger Agreement, at the Effective Time, Parent assumed each outstanding equivalent stock unit award of the Company (each, an "Assumed ESU") representing the right to receive a cash payment based on the fair market value of the shares of Common Stock, generally subject to the same terms and conditions as the Assumed ESU immediately prior to the Effective Time, except (i) the maximum value cap of each Assumed ESU in effect immediately prior to the Effective Time ceased to apply and (ii) each Assumed ESU was converted into an award covering a number of Parent Ordinary Shares equal to the product of (A) the number of shares of Common Stock subject to the Assumed ESU immediately prior to the Effective Time, multiplied by (B) 0.5537, rounded down to the nearest whole share.

Represents certain Assumed ESUs which were scheduled to vest in three equal annual installments beginning on February 28, 2027.

Pursuant to the Merger Agreement, at the Effective Time, Parent assumed each outstanding performance stock unit award of the Company (each, an "Assumed PSU") representing the right to receive shares of Common Stock, generally subject to the same terms and conditions as the Assumed PSU immediately prior to the Effective Time, except (i) each Assumed PSU was converted into an award covering a number of Parent Ordinary Shares equal to the product of (A) the number of shares of Common Stock subject to the Assumed PSU immediately prior to the Effective Time, multiplied by (B) 0.5537, rounded down to the nearest whole share, and (ii) the performance goals were deemed satisfied at the greater of target and actual level of achievement as of the date of the Merger Agreement, as determined by the Company's board of directors.

Represents certain Assumed PSUs which were scheduled to vest in the first quarter of 2027.

Pursuant to the Merger Agreement, at the Effective Time, Parent assumed each outstanding equivalent stock unit award of the Company (each, an "Assumed ESU") representing the right to receive a cash payment based on the fair market value of the shares of Common Stock, generally subject to the same terms and conditions as the Assumed ESU immediately prior to the Effective Time, except (i) the maximum value cap of each Assumed ESU in effect immediately prior to the Effective Time ceased to apply and (ii) each Assumed ESU was converted into an award covering a number of Parent Ordinary Shares equal to the product of (A) the number of shares of Common Stock subject to the Assumed ESU immediately prior to the Effective Time, multiplied by (B) 0.5537, rounded down to the nearest whole share.

Represents certain Assumed ESUs which were scheduled to vest in two equal annual installments beginning on February 28, 2027.

Pursuant to that certain Agreement and Plan of Merger ("Merger Agreement"), dated May 31, 2026, by and among Weatherford International plc ("Parent"), Trinity Bell Sub, Inc. and NCS Multistage Holdings, Inc. (the "Company"), immediately prior to the effective time of the transactions contemplated thereby (the "Effective Time"), each share of the Company's common stock, par value $0.01 per share ("Common Stock"), was canceled and converted into the right to receive, at the Reporting Person's election: (i) 0.5537 ordinary shares, par value $0.001 per share, of Parent ("Parent Ordinary Shares"); or (ii) a combination of (A) cash in an amount equal to the product of (x) 0.1371 and (y) the closing price for the Parent Ordinary Shares on the Nasdaq Global Select Market on August 31, 2026, subject to a maximum cash election amount; and (B) 0.2392 Parent Ordinary Shares.

Pursuant to the Merger Agreement, at the Effective Time, Parent assumed each outstanding performance stock unit award of the Company (each, an "Assumed PSU") representing the right to receive shares of Common Stock, generally subject to the same terms and conditions as the Assumed PSU immediately prior to the Effective Time, except (i) each Assumed PSU was converted into an award covering a number of Parent Ordinary Shares equal to the product of (A) the number of shares of Common Stock subject to the Assumed PSU immediately prior to the Effective Time, multiplied by (B) 0.5537, rounded down to the nearest whole share, and (ii) the performance goals were deemed satisfied at the greater of target and actual level of achievement as of the date of the Merger Agreement, as determined by the Company's board of directors.

Represents certain Assumed PSUs which were scheduled to vest in the first quarter of 2029.

Pursuant to that certain Agreement and Plan of Merger ("Merger Agreement"), dated May 31, 2026, by and among Weatherford International plc ("Parent"), Trinity Bell Sub, Inc. and NCS Multistage Holdings, Inc. (the "Company"), immediately prior to the effective time of the transactions contemplated thereby (the "Effective Time"), each share of the Company's common stock, par value $0.01 per share ("Common Stock"), was canceled and converted into the right to receive, at the Reporting Person's election: (i) 0.5537 ordinary shares, par value $0.001 per share, of Parent ("Parent Ordinary Shares"); or (ii) a combination of (A) cash in an amount equal to the product of (x) 0.1371 and (y) the closing price for the Parent Ordinary Shares on the Nasdaq Global Select Market on August 31, 2026, subject to a maximum cash election amount; and (B) 0.2392 Parent Ordinary Shares.

Pursuant to that certain Agreement and Plan of Merger ("Merger Agreement"), dated May 31, 2026, by and among Weatherford International plc ("Parent"), Trinity Bell Sub, Inc. and NCS Multistage Holdings, Inc. (the "Company"), immediately prior to the effective time of the transactions contemplated thereby (the "Effective Time"), each share of the Company's common stock, par value $0.01 per share ("Common Stock"), was canceled and converted into the right to receive, at the Reporting Person's election: (i) 0.5537 ordinary shares, par value $0.001 per share, of Parent ("Parent Ordinary Shares"); or (ii) a combination of (A) cash in an amount equal to the product of (x) 0.1371 and (y) the closing price for the Parent Ordinary Shares on the Nasdaq Global Select Market on August 31, 2026, subject to a maximum cash election amount; and (B) 0.2392 Parent Ordinary Shares.

Pursuant to the Merger Agreement, at the Effective Time, Parent assumed each outstanding performance stock unit award of the Company (each, an "Assumed PSU") representing the right to receive shares of Common Stock, generally subject to the same terms and conditions as the Assumed PSU immediately prior to the Effective Time, except (i) each Assumed PSU was converted into an award covering a number of Parent Ordinary Shares equal to the product of (A) the number of shares of Common Stock subject to the Assumed PSU immediately prior to the Effective Time, multiplied by (B) 0.5537, rounded down to the nearest whole share, and (ii) the performance goals were deemed satisfied at the greater of target and actual level of achievement as of the date of the Merger Agreement, as determined by the Company's board of directors.

Represents certain Assumed PSUs which were scheduled to vest in the first quarter of 2028.

The reported securities were disposed of in connection with the consummation of a merger of the Issuer into a wholly-owned subsidiary of Weatherford International plc, for aggregate consideration of $19,666,839.72 in cash and 357,159 ordinary shares of Weatherford International plc.

The reported amount gives effect to a 1-for-20 reverse stock split on December 1, 2020.

The board of Advent International GP, LLC appoints the investment committee of Advent International, L.P. (together, "Advent" and the "Investment Committee," respectively). Such Investment Committee has voting and investment power with respect to the securities that were directly held by Advent-NCS Acquisition Limited Partnership on behalf of various funds and accounts managed by Advent (which may have been included on prior Statements filed with respect to the Issuer). Accordingly, Advent International, L.P. and Advent International GP, LLC may each be deemed to beneficially own the securities directly held by Advent-NCS Acquisition Limited Partnership. Each of the Reporting Persons disclaim such beneficial ownership, except to the extent of their respective pecuniary interest therein, if any, and this Statement shall not be deemed an admission of beneficial ownership of any of the reported securities for purposes of Section 16 or any other purpose.

Pursuant to the Merger Agreement, at the Effective Time, Parent assumed each outstanding performance stock unit award of the Company (each, an "Assumed PSU") representing the right to receive shares of Common Stock, generally subject to the same terms and conditions as the Assumed PSU immediately prior to the Effective Time, except (i) each Assumed PSU was converted into an award covering a number of Parent Ordinary Shares equal to the product of (A) the number of shares of Common Stock subject to the Assumed PSU immediately prior to the Effective Time, multiplied by (B) 0.5537, rounded down to the nearest whole share, and (ii) the performance goals were deemed satisfied at the greater of target and actual level of achievement as of the date of the Merger Agreement, as determined by the Company's board of directors.

Represents certain Assumed PSUs which were scheduled to vest in the first quarter of 2027.

Pursuant to the Merger Agreement, at the Effective Time, Parent assumed each outstanding equivalent stock unit award of the Company (each, an "Assumed ESU") representing the right to receive a cash payment based on the fair market value of the shares of Common Stock, generally subject to the same terms and conditions as the Assumed ESU immediately prior to the Effective Time, except (i) the maximum value cap of each Assumed ESU in effect immediately prior to the Effective Time ceased to apply and (ii) each Assumed ESU was converted into an award covering a number of Parent Ordinary Shares equal to the product of (A) the number of shares of Common Stock subject to the Assumed ESU immediately prior to the Effective Time, multiplied by (B) 0.5537, rounded down to the nearest whole share.

Represents certain Assumed ESUs which were scheduled to vest in three equal annual installments beginning on February 28, 2027.

Pursuant to the Merger Agreement, at the Effective Time, Parent assumed each outstanding equivalent stock unit award of the Company (each, an "Assumed ESU") representing the right to receive a cash payment based on the fair market value of the shares of Common Stock, generally subject to the same terms and conditions as the Assumed ESU immediately prior to the Effective Time, except (i) the maximum value cap of each Assumed ESU in effect immediately prior to the Effective Time ceased to apply and (ii) each Assumed ESU was converted into an award covering a number of Parent Ordinary Shares equal to the product of (A) the number of shares of Common Stock subject to the Assumed ESU immediately prior to the Effective Time, multiplied by (B) 0.5537, rounded down to the nearest whole share.

Represents certain Assumed ESUs which were scheduled to vest in two equal annual installments beginning on February 28, 2027.

Pursuant to the Merger Agreement, at the Effective Time each outstanding stock option of the Company representing the right to purchase Common Stock, whether vested or unvested, that was outstanding immediately prior to the Effective Time and had a per share exercise price equal to or greater than the Merger Consideration was, at the Effective Time, canceled without consideration and was of no further force or effect.

Pursuant to that certain Agreement and Plan of Merger ("Merger Agreement"), dated May 31, 2026, by and among Weatherford International plc ("Parent"), Trinity Bell Sub, Inc. and NCS Multistage Holdings, Inc. (the "Company"), immediately prior to the effective time of the transactions contemplated thereby (the "Effective Time"), each share of the Company's common stock, par value $0.01 per share ("Common Stock"), was canceled and converted into the right to receive, at the Reporting Person's election: (i) 0.5537 ordinary shares, par value $0.001 per share, of Parent ("Parent Ordinary Shares"); or (ii) a combination of (A) cash in an amount equal to the product of (x) 0.1371 and (y) the closing price for the Parent Ordinary Shares on the Nasdaq Global Select Market on August 31, 2026, subject to a maximum cash election amount; and (B) 0.2392 Parent Ordinary Shares.

Pursuant to the Merger Agreement, at the Effective Time, Parent assumed each outstanding performance stock unit award of the Company (each, an "Assumed PSU") representing the right to receive shares of Common Stock, generally subject to the same terms and conditions as the Assumed PSU immediately prior to the Effective Time, except (i) each Assumed PSU was converted into an award covering a number of Parent Ordinary Shares equal to the product of (A) the number of shares of Common Stock subject to the Assumed PSU immediately prior to the Effective Time, multiplied by (B) 0.5537, rounded down to the nearest whole share, and (ii) the performance goals were deemed satisfied at the greater of target and actual level of achievement as of the date of the Merger Agreement, as determined by the Company's board of directors.

Represents certain Assumed PSUs which were scheduled to vest in the first quarter of 2029.

Pursuant to the Merger Agreement, at the Effective Time, Parent assumed each outstanding performance stock unit award of the Company (each, an "Assumed PSU") representing the right to receive shares of Common Stock, generally subject to the same terms and conditions as the Assumed PSU immediately prior to the Effective Time, except (i) each Assumed PSU was converted into an award covering a number of Parent Ordinary Shares equal to the product of (A) the number of shares of Common Stock subject to the Assumed PSU immediately prior to the Effective Time, multiplied by (B) 0.5537, rounded down to the nearest whole share, and (ii) the performance goals were deemed satisfied at the greater of target and actual level of achievement as of the date of the Merger Agreement, as determined by the Company's board of directors.

Represents certain Assumed PSUs which were scheduled to vest in the first quarter of 2027.

Pursuant to the Merger Agreement, at the Effective Time, Parent assumed each outstanding equivalent stock unit award of the Company (each, an "Assumed ESU") representing the right to receive a cash payment based on the fair market value of the shares of Common Stock, generally subject to the same terms and conditions as the Assumed ESU immediately prior to the Effective Time, except (i) the maximum value cap of each Assumed ESU in effect immediately prior to the Effective Time ceased to apply and (ii) each Assumed ESU was converted into an award covering a number of Parent Ordinary Shares equal to the product of (A) the number of shares of Common Stock subject to the Assumed ESU immediately prior to the Effective Time, multiplied by (B) 0.5537, rounded down to the nearest whole share.

Represents certain Assumed ESUs which were scheduled to vest in two equal annual installments beginning on February 28, 2027.

Pursuant to the Merger Agreement, at the Effective Time, Parent assumed each outstanding equivalent stock unit award of the Company (each, an "Assumed ESU") representing the right to receive a cash payment based on the fair market value of the shares of Common Stock, generally subject to the same terms and conditions as the Assumed ESU immediately prior to the Effective Time, except (i) the maximum value cap of each Assumed ESU in effect immediately prior to the Effective Time ceased to apply and (ii) each Assumed ESU was converted into an award covering a number of Parent Ordinary Shares equal to the product of (A) the number of shares of Common Stock subject to the Assumed ESU immediately prior to the Effective Time, multiplied by (B) 0.5537, rounded down to the nearest whole share.

Represents certain Assumed ESUs which were scheduled to vest in three equal annual installments beginning on February 28, 2027.

Pursuant to the Merger Agreement, at the Effective Time, Parent assumed each outstanding performance stock unit award of the Company (each, an "Assumed PSU") representing the right to receive shares of Common Stock, generally subject to the same terms and conditions as the Assumed PSU immediately prior to the Effective Time, except (i) each Assumed PSU was converted into an award covering a number of Parent Ordinary Shares equal to the product of (A) the number of shares of Common Stock subject to the Assumed PSU immediately prior to the Effective Time, multiplied by (B) 0.5537, rounded down to the nearest whole share, and (ii) the performance goals were deemed satisfied at the greater of target and actual level of achievement as of the date of the Merger Agreement, as determined by the Company's board of directors.

Represents certain Assumed PSUs which were scheduled to vest in the first quarter of 2027.

Pursuant to the Merger Agreement, at the Effective Time, Parent assumed each outstanding performance stock unit award of the Company (each, an "Assumed PSU") representing the right to receive shares of Common Stock, generally subject to the same terms and conditions as the Assumed PSU immediately prior to the Effective Time, except (i) each Assumed PSU was converted into an award covering a number of Parent Ordinary Shares equal to the product of (A) the number of shares of Common Stock subject to the Assumed PSU immediately prior to the Effective Time, multiplied by (B) 0.5537, rounded down to the nearest whole share, and (ii) the performance goals were deemed satisfied at the greater of target and actual level of achievement as of the date of the Merger Agreement, as determined by the Company's board of directors.

Represents certain Assumed PSUs which were scheduled to vest in the first quarter of 2028.

Pursuant to that certain Agreement and Plan of Merger ("Merger Agreement"), dated May 31, 2026, by and among Weatherford International plc ("Parent"), Trinity Bell Sub, Inc. and NCS Multistage Holdings, Inc. (the "Company"), immediately prior to the effective time of the transactions contemplated thereby (the "Effective Time"), each share of the Company's common stock, par value $0.01 per share ("Common Stock"), was canceled and converted into the right to receive, at the Reporting Person's election: (i) 0.5537 ordinary shares, par value $0.001 per share, of Parent ("Parent Ordinary Shares"); or (ii) a combination of (A) cash in an amount equal to the product of (x) 0.1371 and (y) the closing price for the Parent Ordinary Shares on the Nasdaq Global Select Market on August 31, 2026, subject to a maximum cash election amount; and (B) 0.2392 Parent Ordinary Shares.

Pursuant to the Merger Agreement, at the Effective Time, Parent assumed each outstanding equivalent stock unit award of the Company (each, an "Assumed ESU") representing the right to receive a cash payment based on the fair market value of the shares of Common Stock, generally subject to the same terms and conditions as the Assumed ESU immediately prior to the Effective Time, except (i) the maximum value cap of each Assumed ESU in effect immediately prior to the Effective Time ceased to apply and (ii) each Assumed ESU was converted into an award covering a number of Parent Ordinary Shares equal to the product of (A) the number of shares of Common Stock subject to the Assumed ESU immediately prior to the Effective Time, multiplied by (B) 0.5537, rounded down to the nearest whole share.

Represents certain Assumed ESUs which were scheduled to vest on February 28, 2027.

Pursuant to that certain Agreement and Plan of Merger ("Merger Agreement"), dated May 31, 2026, by and among Weatherford International plc ("Parent"), Trinity Bell Sub, Inc. and NCS Multistage Holdings, Inc. (the "Company"), immediately prior to the effective time of the transactions contemplated thereby (the "Effective Time"), each share of the Company's common stock, par value $0.01 per share ("Common Stock"), was canceled and converted into the right to receive, at the Reporting Person's election: (i) 0.5537 ordinary shares, par value $0.001 per share, of Parent ("Parent Ordinary Shares"); or (ii) a combination of (A) cash in an amount equal to the product of (x) 0.1371 and (y) the closing price for the Parent Ordinary Shares on the Nasdaq Global Select Market on August 31, 2026, subject to a maximum cash election amount; and (B) 0.2392 Parent Ordinary Shares.

Pursuant to that certain Agreement and Plan of Merger ("Merger Agreement"), dated May 31, 2026, by and among Weatherford International plc ("Parent"), Trinity Bell Sub, Inc. and NCS Multistage Holdings, Inc. (the "Company"), immediately prior to the effective time of the transactions contemplated thereby (the "Effective Time"), each share of the Company's common stock, par value $0.01 per share ("Common Stock"), was canceled and converted into the right to receive, at the Reporting Person's election: (i) 0.5537 ordinary shares, par value $0.001 per share, of Parent ("Parent Ordinary Shares"); or (ii) a combination of (A) cash in an amount equal to the product of (x) 0.1371 and (y) the closing price for the Parent Ordinary Shares on the Nasdaq Global Select Market on August 31, 2026, subject to a maximum cash election amount; and (B) 0.2392 Parent Ordinary Shares.

Pursuant to the Merger Agreement, at the Effective Time, Parent assumed each outstanding performance stock unit award of the Company (each, an "Assumed PSU") representing the right to receive shares of Common Stock, generally subject to the same terms and conditions as the Assumed PSU immediately prior to the Effective Time, except (i) each Assumed PSU was converted into an award covering a number of Parent Ordinary Shares equal to the product of (A) the number of shares of Common Stock subject to the Assumed PSU immediately prior to the Effective Time, multiplied by (B) 0.5537, rounded down to the nearest whole share, and (ii) the performance goals were deemed satisfied at the greater of target and actual level of achievement as of the date of the Merger Agreement, as determined by the Company's board of directors.

Represents certain Assumed PSUs which were scheduled to vest in the first quarter of 2029.

Pursuant to that certain Agreement and Plan of Merger ("Merger Agreement"), dated May 31, 2026, by and among Weatherford International plc ("Parent"), Trinity Bell Sub, Inc. and NCS Multistage Holdings, Inc. (the "Company"), immediately prior to the effective time of the transactions contemplated thereby (the "Effective Time"), each share of the Company's common stock, par value $0.01 per share ("Common Stock"), was canceled and converted into the right to receive, at the Reporting Person's election: (i) 0.5537 ordinary shares, par value $0.001 per share, of Parent ("Parent Ordinary Shares"); or (ii) a combination of (A) cash in an amount equal to the product of (x) 0.1371 and (y) the closing price for the Parent Ordinary Shares on the Nasdaq Global Select Market on August 31, 2026, subject to a maximum cash election amount; and (B) 0.2392 Parent Ordinary Shares (the "Merger Consideration").

Pursuant to that certain Agreement and Plan of Merger ("Merger Agreement"), dated May 31, 2026, by and among Weatherford International plc ("Parent"), Trinity Bell Sub, Inc. and NCS Multistage Holdings, Inc. (the "Company"), immediately prior to the effective time of the transactions contemplated thereby (the "Effective Time"), each share of the Company's common stock, par value $0.01 per share ("Common Stock"), was canceled and converted into the right to receive, at the Reporting Person's election: (i) 0.5537 ordinary shares, par value $0.001 per share, of Parent ("Parent Ordinary Shares"); or (ii) a combination of (A) cash in an amount equal to the product of (x) 0.1371 and (y) the closing price for the Parent Ordinary Shares on the Nasdaq Global Select Market on August 31, 2026, subject to a maximum cash election amount; and (B) 0.2392 Parent Ordinary Shares.

Pursuant to the Merger Agreement, at the Effective Time, Parent assumed each outstanding equivalent stock unit award of the Company (each, an "Assumed ESU") representing the right to receive a cash payment based on the fair market value of the shares of Common Stock, generally subject to the same terms and conditions as the Assumed ESU immediately prior to the Effective Time, except (i) the maximum value cap of each Assumed ESU in effect immediately prior to the Effective Time ceased to apply and (ii) each Assumed ESU was converted into an award covering a number of Parent Ordinary Shares equal to the product of (A) the number of shares of Common Stock subject to the Assumed ESU immediately prior to the Effective Time, multiplied by (B) 0.5537, rounded down to the nearest whole share.

Represents certain Assumed ESUs which were scheduled to vest on February 28, 2027.

Pursuant to the Merger Agreement, at the Effective Time, Parent assumed each outstanding equivalent stock unit award of the Company (each, an "Assumed ESU") representing the right to receive a cash payment based on the fair market value of the shares of Common Stock, generally subject to the same terms and conditions as the Assumed ESU immediately prior to the Effective Time, except (i) the maximum value cap of each Assumed ESU in effect immediately prior to the Effective Time ceased to apply and (ii) each Assumed ESU was converted into an award covering a number of Parent Ordinary Shares equal to the product of (A) the number of shares of Common Stock subject to the Assumed ESU immediately prior to the Effective Time, multiplied by (B) 0.5537, rounded down to the nearest whole share.

Represents certain Assumed ESUs which were scheduled to vest on February 28, 2027.

Pursuant to that certain Agreement and Plan of Merger ("Merger Agreement"), dated May 31, 2026, by and among Weatherford International plc ("Parent"), Trinity Bell Sub, Inc. and NCS Multistage Holdings, Inc. (the "Company"), immediately prior to the effective time of the transactions contemplated thereby (the "Effective Time"), each share of the Company's common stock, par value $0.01 per share ("Common Stock"), was canceled and converted into the right to receive, at the Reporting Person's election: (i) 0.5537 ordinary shares, par value $0.001 per share, of Parent ("Parent Ordinary Shares"); or (ii) a combination of (A) cash in an amount equal to the product of (x) 0.1371 and (y) the closing price for the Parent Ordinary Shares on the Nasdaq Global Select Market on August 31, 2026, subject to a maximum cash election amount; and (B) 0.2392 Parent Ordinary Shares.

Pursuant to the Merger Agreement, at the Effective Time, Parent assumed each outstanding performance stock unit award of the Company (each, an "Assumed PSU") representing the right to receive shares of Common Stock, generally subject to the same terms and conditions as the Assumed PSU immediately prior to the Effective Time, except (i) each Assumed PSU was converted into an award covering a number of Parent Ordinary Shares equal to the product of (A) the number of shares of Common Stock subject to the Assumed PSU immediately prior to the Effective Time, multiplied by (B) 0.5537, rounded down to the nearest whole share, and (ii) the performance goals were deemed satisfied at the greater of target and actual level of achievement as of the date of the Merger Agreement, as determined by the Company's board of directors.

Represents certain Assumed PSUs which were scheduled to vest in the first quarter of 2029.

Pursuant to the Merger Agreement, at the Effective Time, Parent assumed each outstanding equivalent stock unit award of the Company (each, an "Assumed ESU") representing the right to receive a cash payment based on the fair market value of the shares of Common Stock, generally subject to the same terms and conditions as the Assumed ESU immediately prior to the Effective Time, except (i) the maximum value cap of each Assumed ESU in effect immediately prior to the Effective Time ceased to apply and (ii) each Assumed ESU was converted into an award covering a number of Parent Ordinary Shares equal to the product of (A) the number of shares of Common Stock subject to the Assumed ESU immediately prior to the Effective Time, multiplied by (B) 0.5537, rounded down to the nearest whole share.

Represents certain Assumed ESUs which were scheduled to vest in three equal annual installments beginning on February 28, 2027.

Pursuant to the Merger Agreement, at the Effective Time, Parent assumed each outstanding performance stock unit award of the Company (each, an "Assumed PSU") representing the right to receive shares of Common Stock, generally subject to the same terms and conditions as the Assumed PSU immediately prior to the Effective Time, except (i) each Assumed PSU was converted into an award covering a number of Parent Ordinary Shares equal to the product of (A) the number of shares of Common Stock subject to the Assumed PSU immediately prior to the Effective Time, multiplied by (B) 0.5537, rounded down to the nearest whole share, and (ii) the performance goals were deemed satisfied at the greater of target and actual level of achievement as of the date of the Merger Agreement, as determined by the Company's board of directors.

Represents certain Assumed PSUs which were scheduled to vest in the first quarter of 2028.

Pursuant to the Merger Agreement, at the Effective Time, Parent assumed each outstanding equivalent stock unit award of the Company (each, an "Assumed ESU") representing the right to receive a cash payment based on the fair market value of the shares of Common Stock, generally subject to the same terms and conditions as the Assumed ESU immediately prior to the Effective Time, except (i) the maximum value cap of each Assumed ESU in effect immediately prior to the Effective Time ceased to apply and (ii) each Assumed ESU was converted into an award covering a number of Parent Ordinary Shares equal to the product of (A) the number of shares of Common Stock subject to the Assumed ESU immediately prior to the Effective Time, multiplied by (B) 0.5537, rounded down to the nearest whole share.

Represents certain Assumed ESUs which were scheduled to vest in three equal annual installments beginning on February 28, 2027.

Pursuant to the Merger Agreement, at the Effective Time, Parent assumed each outstanding equivalent stock unit award of the Company (each, an "Assumed ESU") representing the right to receive a cash payment based on the fair market value of the shares of Common Stock, generally subject to the same terms and conditions as the Assumed ESU immediately prior to the Effective Time, except (i) the maximum value cap of each Assumed ESU in effect immediately prior to the Effective Time ceased to apply and (ii) each Assumed ESU was converted into an award covering a number of Parent Ordinary Shares equal to the product of (A) the number of shares of Common Stock subject to the Assumed ESU immediately prior to the Effective Time, multiplied by (B) 0.5537, rounded down to the nearest whole share.

Represents certain Assumed ESUs which were scheduled to vest on February 28, 2027.

Pursuant to the Merger Agreement, at the Effective Time, Parent assumed each outstanding performance stock unit award of the Company (each, an "Assumed PSU") representing the right to receive shares of Common Stock, generally subject to the same terms and conditions as the Assumed PSU immediately prior to the Effective Time, except (i) each Assumed PSU was converted into an award covering a number of Parent Ordinary Shares equal to the product of (A) the number of shares of Common Stock subject to the Assumed PSU immediately prior to the Effective Time, multiplied by (B) 0.5537, rounded down to the nearest whole share, and (ii) the performance goals were deemed satisfied at the greater of target and actual level of achievement as of the date of the Merger Agreement, as determined by the Company's board of directors.

Represents certain Assumed PSUs which were scheduled to vest in the first quarter of 2028.

Pursuant to that certain Agreement and Plan of Merger ("Merger Agreement"), dated May 31, 2026, by and among Weatherford International plc ("Parent"), Trinity Bell Sub, Inc. and NCS Multistage Holdings, Inc. (the "Company"), immediately prior to the effective time of the transactions contemplated thereby (the "Effective Time"), each share of the Company's common stock, par value $0.01 per share ("Common Stock"), was canceled and converted into the right to receive, at the Reporting Person's election: (i) 0.5537 ordinary shares, par value $0.001 per share, of Parent ("Parent Ordinary Shares"); or (ii) a combination of (A) cash in an amount equal to the product of (x) 0.1371 and (y) the closing price for the Parent Ordinary Shares on the Nasdaq Global Select Market on August 31, 2026, subject to a maximum cash election amount; and (B) 0.2392 Parent Ordinary Shares.

Pursuant to that certain Agreement and Plan of Merger ("Merger Agreement"), dated May 31, 2026, by and among Weatherford International plc ("Parent"), Trinity Bell Sub, Inc. and NCS Multistage Holdings, Inc. (the "Company"), immediately prior to the effective time of the transactions contemplated thereby (the "Effective Time"), each share of the Company's common stock, par value $0.01 per share ("Common Stock"), was canceled and converted into the right to receive, at the Reporting Person's election: (i) 0.5537 ordinary shares, par value $0.001 per share, of Parent ("Parent Ordinary Shares"); or (ii) a combination of (A) cash in an amount equal to the product of (x) 0.1371 and (y) the closing price for the Parent Ordinary Shares on the Nasdaq Global Select Market on August 31, 2026, subject to a maximum cash election amount; and (B) 0.2392 Parent Ordinary Shares.

Pursuant to the Merger Agreement, at the Effective Time, Parent assumed each outstanding equivalent stock unit award of the Company (each, an "Assumed ESU") representing the right to receive a cash payment based on the fair market value of the shares of Common Stock, generally subject to the same terms and conditions as the Assumed ESU immediately prior to the Effective Time, except (i) the maximum value cap of each Assumed ESU in effect immediately prior to the Effective Time ceased to apply and (ii) each Assumed ESU was converted into an award covering a number of Parent Ordinary Shares equal to the product of (A) the number of shares of Common Stock subject to the Assumed ESU immediately prior to the Effective Time, multiplied by (B) 0.5537, rounded down to the nearest whole share.

Represents certain Assumed ESUs which were scheduled to vest in two equal annual installments beginning on February 28, 2027.

Includes 1,180 restricted stock units which vest in two equal annual installments beginning on February 28, 2027 and 1,366 restricted stock units which vest in three equal annual installments beginning on February 28, 2027.

Includes 2,174 restricted stock units which vest in two equal annual installments beginning on February 28, 2027 and 2,498 restricted stock units which vest in three equal annual installments beginning on February 28, 2027.

These performance stock units represent a contingent right to receive common stock, based on the Issuer's relative total shareholder return versus that of its peer group, subject to an absolute total shareholder return modifier. Each performance stock unit will settle for between zero and 1.25 shares of common stock in the first quarter of 2029, based on achievement of the performance measures over a three-year period, following certification by the Compensation, Nominating and Governance Committee of the performance results.

Includes 3,221 restricted stock units which vest on February 28, 2027 and 17,698 vested restricted stock units and all of which settle within thirty days following the earlier of (i) the termination of the Reporting Person's service for any reason or (ii) a change of control.

These equivalent stock units settle in cash and represent the economic equivalent of one share of common stock, provided that the amount of cash settled for any equivalent stock unit will not exceed the maximum payout established by the Compensation, Nominating and Governance Committee.

The number of derivative securities reported in column 9 represents 3,070 equivalent stock units which vest on February 28, 2027, 1,689 equivalent stock units which vest in two equal annual installments beginning on February 28, 2027 and 1,940 equivalent stock units which vest in three equal annual installments beginning on February 28, 2027.

These equivalent stock units settle in cash and represent the economic equivalent of one share of common stock, provided that the amount of cash settled for any equivalent stock unit will not exceed the maximum payout established by the Compensation, Nominating and Governance Committee.

The number of derivative securities reported in column 9 represents 3,952 equivalent stock units which vest on February 28, 2027, 2,174 equivalent stock units which vest in two equal annual installments beginning on February 28, 2027 and 2,498 equivalent stock units which in three equal annual installments beginning on February 28, 2027.

These performance stock units represent a contingent right to receive common stock, based on the Issuer's relative total shareholder return versus that of its peer group, subject to an absolute total shareholder return modifier. Each performance stock unit will settle for between zero and 1.25 shares of common stock in the first quarter of 2029, based on achievement of the performance measures over a three-year period, following certification by the Compensation, Nominating and Governance Committee of the performance results.

Includes 4,826 restricted stock units which vest in two equal annual installments beginning on February 28, 2027 and 5,679 restricted stock units which vest in three equal annual installments beginning on February 28, 2027.