ARX · Accelerant Holdings · Insider Trading

The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 8, 2025 and amended on March 24, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.54 to $19.61, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 23, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $12.055 to $12.570, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 24, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $11.89 to $12.335, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

These securities are held directly by Badly Bent LLC. The Reporting Person is the manager of the sole member of Badly Bent LLC. The Reporting Person disclaims beneficial ownership over these securities, except to the extent of his pecuniary interest therein.

The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 23, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $11.89 to $12.3450, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 24, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $11.815 to $12.235, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

These securities are held directly by Badly Bent LLC. The Reporting Person is the manager of the sole member of Badly Bent LLC. The Reporting Person disclaims beneficial ownership over these securities, except to the extent of his pecuniary interest therein.

The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 23, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.15 to $14.95, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 23, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.38 to $14.83, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 24, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.29 to $14.66, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

These securities are held directly by Badly Bent LLC. The Reporting Person is the manager of the sole member of Badly Bent LLC. The Reporting Person disclaims beneficial ownership over these securities, except to the extent of his pecuniary interest therein.

The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 24, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.40 to $14.83, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

These securities are held directly by Badly Bent LLC. The Reporting Person is the manager of the sole member of Badly Bent LLC. The Reporting Person disclaims beneficial ownership over these securities, except to the extent of his pecuniary interest therein.

The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 7, 2025.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.44 to $14.84, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

Represents Class A Common Shares withheld, pursuant to Issuer policy, to satisfy tax withholding obligations upon the settlement of vested Restricted Share Units. Does not reflect a discretionary transaction nor an open market sale of securities.

The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 24, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.08 to $13.705 inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

These securities are held directly by Badly Bent LLC. The Reporting Person is the manager of the sole member of Badly Bent LLC. The Reporting Person disclaims beneficial ownership over these securities, except to the extent of his pecuniary interest therein.

The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 24, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.295 to $14.30, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

These securities are held directly by Badly Bent LLC. The Reporting Person is the manager of the sole member of Badly Bent LLC. The Reporting Person disclaims beneficial ownership over these securities, except to the extent of his pecuniary interest therein.

The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 23, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $12.37 to $12.89, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 23, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $12.61 to $13.38, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 24, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $12.755 to $13.49, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

These securities are held directly by Badly Bent LLC. The Reporting Person is the manager of the sole member of Badly Bent LLC. The Reporting Person disclaims beneficial ownership over these securities, except to the extent of his pecuniary interest therein.

The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 24, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.18 to $13.69, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

These securities are held directly by Badly Bent LLC. The Reporting Person is the manager of the sole member of Badly Bent LLC. The Reporting Person disclaims beneficial ownership over these securities, except to the extent of his pecuniary interest therein.

The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 24, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $12.63 to $13.80, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

These securities are held directly by Badly Bent LLC. The Reporting Person is the manager of the sole member of Badly Bent LLC. The Reporting Person disclaims beneficial ownership over these securities, except to the extent of his pecuniary interest therein.

The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 23, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $12.8750 to $13.78, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 23, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $12.79 to $13.25, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 24, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $12.95 to $13.28, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

These securities are held directly by Badly Bent LLC. The Reporting Person is the manager of the sole member of Badly Bent LLC. The Reporting Person disclaims beneficial ownership over these securities, except to the extent of his pecuniary interest therein.

The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 23, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $12.79 to $13.30, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

These securities are held directly by Famed Ventures Limited. The Reporting Person is the sole director and owner of Famed Ventures Limited.

The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 8, 2025 and amended on March 24, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $12.89 to $13.28, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 23, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $12.89 to $13.6150, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

These securities are held directly by Famed Ventures Limited. The Reporting Person is the sole director and owner of Famed Ventures Limited.

Represents an award of Restricted Stock Units ("RSUs") granted on May 13, 2026. The RSUs are scheduled to vest as to twenty-five percent (25%) of the RSUs on the one-year anniversary of the Grant Date and as to six and one-quarter percent (6-1/4%) of the RSUs on the first day of each of the twelve (12) calendar quarters beginning after such anniversary. Each RSU represents a contingent right to receive one Class A common share upon settlement.

Represents an award of Restricted Stock Units ("RSUs") granted on May 13, 2026 pursuant to the Issuer's non-employee director compensation program. Half of the RSUs (11,658) were awarded as a one-time award in connection with the Reporting Person's appointment as a non-employee director and are scheduled to vest in equal 1/3 increments on each of the three anniversaries following the grant date, and the other half (11,658) were awarded as an annual award and are scheduled to vest on the one-year anniversary of the grant date. Each RSU represents a contingent right to receive one Class A common share upon settlement.

Represents an annual award of Restricted Stock Units ("RSUs") granted pursuant to the Issuer's non-employee director compensation program. Each RSU represents the contingent right to receive one Class A Common Share. The RSUs are scheduled to vest in full on the one-year anniversary of the Grant Date.

Represents an award of Restricted Stock Units ("RSUs") granted on May 13, 2026 pursuant to the Issuer's non-employee director compensation program. Half of the RSUs (11,658) were awarded as a one-time award in connection with the Reporting Person's appointment as a non-employee director and are scheduled to vest in equal 1/3 increments on each of the three anniversaries following the grant date, and the other half (11,658) were awarded as an annual award and are scheduled to vest on the one-year anniversary of the grant date. Each RSU represents a contingent right to receive one Class A common share upon settlement.

Represents an annual award of Restricted Stock Units ("RSUs") granted pursuant to the Issuer's non-employee director compensation program. Each RSU represents the contingent right to receive one Class A Common Share. The RSUs are scheduled to vest in full on the one-year anniversary of the Grant Date.

Represents an annual award of Restricted Stock Units ("RSUs") granted pursuant to the Issuer's non-employee director compensation program. Each RSU represents the contingent right to receive one Class A Common Share. The RSUs are scheduled to vest in full on the one-year anniversary of the Grant Date.

The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 8, 2025.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $12.23 to $13.13, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

Represents an award of Restricted Stock Units granted on March 18, 2026. The RSUs are scheduled to vest as to twenty-five percent (25%) of the RSUs on the one-year anniversary of the Grant Date and as to six and one-quarter percent (6-1/4%) of the RSUs on the first day of each of the twelve (12) calendar quarters beginning after such anniversary.

Represents an award of Restricted Stock Units granted on March 18, 2026. The RSUs are scheduled to vest as to twenty-five percent (25%) of the RSUs on the one-year anniversary of the Grant Date and as to six and one-quarter percent (6-1/4%) of the RSUs on the first day of each of the twelve (12) calendar quarters beginning after such anniversary.

Represents an award of Restricted Stock Units granted on March 18, 2026. The RSUs are scheduled to vest as to twenty-five percent (25%) of the RSUs on the one-year anniversary of the Grant Date and as to six and one-quarter percent (6-1/4%) of the RSUs on the first day of each of the twelve (12) calendar quarters beginning after such anniversary.

Represents an award of Restricted Stock Units granted on March 18, 2026. The RSUs are scheduled to vest as to twenty-five percent (25%) of the RSUs on the one-year anniversary of the Grant Date and as to six and one-quarter percent (6-1/4%) of the RSUs on the first day of each of the twelve (12) calendar quarters beginning after such anniversary.

Represents Class A Common Shares withheld, pursuant to Issuer policy, to satisfy tax withholding obligations upon the settlement of vested Restricted Stock Units. Does not reflect a discretionary transaction nor an open market sale of securities.

Represents Class A Common Shares withheld, pursuant to Issuer policy, to satisfy tax withholding obligations upon the settlement of vested Restricted Stock Units. Does not reflect a discretionary transaction nor an open market sale of securities.

This transaction was executed in multiple trades at prices ranging from $13.15 to $13.58, inclusive. The price reported in Column 4 above reflects the weighted average purchase price. The reporting person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of Class A Common Shares purchased at each respective price within the range set forth in footnote 1 of this Form 4.

This number reflects a minor adjustment to account for a correction in the number of Class A Common Shares reported as beneficially owned by the Reporting Person following the closing of the Issuer's initial public offering on July 25, 2025, as reported in the Form 4 filed by the Reporting Person on July 29, 2025.

The price reported in Column 4 above reflects the weighted average purchase price. This transaction was executed in multiple trades at prices ranging from $13.18 to $13.59, inclusive. The reporting person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of Class A Common Shares purchased at each respective price within the range set forth in footnote 1 of this Form 4.

The price reported in Column 4 above reflects the weighted average purchase price. This transaction was executed in multiple trades at prices ranging from $12.84 to $13.70, inclusive. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of Class A Common Shares purchased at each respective price within the range set forth in footnote 1 of this Form 4.

This number reflects a minor adjustment to account for a correction in the number of Class A Common Shares reported as beneficially owned by the Reporting Person following the closing of the Issuer's initial public offering on July 25, 2025, as reported in the Form 4 filed by the Reporting Person on July 29, 2025.

The price reported in Column 4 above reflects the weighted average purchase price. This transaction was executed in multiple trades at prices ranging from $13.08 to $13.12, inclusive. The reporting person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of Class A Common Shares purchased at each respective price within the range set forth in footnote 1 of this Form 4.

The price reported in Column 4 above reflects the weighted average purchase price. This transaction was executed in multiple trades at prices ranging from $13.15 to $13.83, inclusive. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of Class A Common Shares purchased at each respective price within the range set forth in footnote 1 of this Form 4.

These numbers reflect minor adjustments to account for a correction in the number of Class A Common Shares reported as directly and indirectly beneficially owned by the Reporting Person following the closing of the Issuer's initial public offering on July 25, 2025, as reported in the Form 4 filed by the Reporting Person on July 29, 2025.

These securities are held directly by Badly Bent LLC. The Reporting Person is the manager of the sole member of Badly Bent LLC. The Reporting Person disclaims beneficial ownership over these securities, except to the extent of his pecuniary interest therein.

Each holder of Class B Common Shares has the right to convert their Class B Common Shares into Class A Common Shares on a 1-for-1 basis at any time and at their option. Additionally, Class B Common Shares will automatically convert into Class A Common Shares, on a 1-for-1 basis, immediately following a transfer to any non-permitted holder of Class B Common Shares, and all outstanding Class B Common Shares will automatically convert into Class A Common Shares, on a 1-for-1 basis, on the earlier of: (i) if at any time following the consummation of the IPO, the holders of the Class B Common Shares immediately prior to the consummation of the IPO hold less than 50% of the total Class B Common Shares then in issue, and (ii) the third anniversary of the consummation of the Issuer's IPO.

In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class B Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

These securities are held directly by ACP Accelerant Investment Holding Company II, Ltd. ACP Accelerant Holdings, L.P. is the sole owner of ACP Accelerant Investment Holding Company II, Ltd. Each of (i) ACP Insurance Management, LLC, as the general partner of ACP Accelerant Holdings, L.P., and (ii) Mr. Schwartz, as the sole owner and managing member of ACP Insurance Management, LLC, may be deemed to have voting and dispositive power over these securities, but disclaim beneficial ownership over these securities except to the extent of their respective pecuniary interest therein, if any.

These Class B Common Shares converted into Class A Common Shares on a 1-for-1 basis and then were sold pursuant to an underwriting agreement dated as of July 23, 2025, by and among the Issuer, the selling stockholders, and the underwriters named therein in connection with the Issuer's IPO.

These securities are held directly by ACP Accelerant Investment Holding Company II, Ltd. ACP Accelerant Holdings, L.P. is the sole owner of ACP Accelerant Investment Holding Company II, Ltd. Each of (i) ACP Insurance Management, LLC, as the general partner of ACP Accelerant Holdings, L.P., and (ii) Mr. Schwartz, as the sole owner and managing member of ACP Insurance Management, LLC, may be deemed to have voting and dispositive power over these securities, but disclaim beneficial ownership over these securities except to the extent of their respective pecuniary interest therein, if any.

These Class B Common Shares converted into Class A Common Shares on a 1-for-1 basis and then were sold pursuant to an underwriting agreement dated as of July 23, 2025, by and among the Issuer, the selling stockholders, and the underwriters named therein in connection with the Issuer's IPO.

These securities are held directly by ACP Accelerant Co-Invest, LLC. Each of (i) ACP Insurance Management, LLC, as the managing member of ACP Accelerant Co-Invest, LLC, and (ii) Mr. Schwartz, as the sole owner and managing member of ACP Insurance Management, LLC, may be deemed to have voting and dispositive power over these securities, but disclaim beneficial ownership over these securities except to the extent of their respective pecuniary interest therein, if any.

These Class B Common Shares converted into Class A Common Shares on a 1-for-1 basis and then were sold pursuant to an underwriting agreement dated as of July 23, 2025, by and among the Issuer, the selling stockholders, and the underwriters named therein in connection with the Issuer's IPO.

These securities are held directly by ACP Accelerant Investment Holding Company II, Ltd. ACP Accelerant Holdings, L.P. is the sole owner of ACP Accelerant Investment Holding Company II, Ltd. Each of (i) ACP Insurance Management, LLC, as the general partner of ACP Accelerant Holdings, L.P., and (ii) Mr. Schwartz, as the sole owner and managing member of ACP Insurance Management, LLC, may be deemed to have voting and dispositive power over these securities, but disclaim beneficial ownership over these securities except to the extent of their respective pecuniary interest therein, if any.

In connection with the Issuer's initial public offering, these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

These Class B Common Shares converted into Class A Common Shares on a 1-for-1 basis and then were sold pursuant to an underwriting agreement dated as of July 23, 2025, by and among the Issuer, the selling stockholders, and the underwriters named therein in connection with the Issuer's IPO.

These securities are held directly by ACP Accelerant Holdings, L.P. Each of (i) ACP Insurance Management, LLC, as the general partner of ACP Accelerant Holdings, L.P., and (ii) Keoni Schwartz ("Mr. Schwartz"), as the sole owner and managing member of ACP Insurance Management, LLC, may be deemed to have voting and dispositive power over these securities, but disclaim beneficial ownership over these securities except to the extent of their respective pecuniary interest therein, if any.