STIM · Neuronetics, Inc.

Represents a restricted stock unit ("RSU") award that vests in four equal installments beginning on July 23, 2027, in each case subject to the Reporting Person's continuous employment with the Issuer through such date.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

The price reported in Column 4 is a weighted average price, rounded to the nearest cent. These shares were purchased in multiple transactions at prices ranging from $1.77 to $1.79, rounded to the nearest cent, inclusive. Mr. Chernett undertakes to provide the Issuer and any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price such shares were purchased.

The reported transactions involved a transfer of shares received by Avinash Amin as director compensation to each of the Madryn Funds as provided for in the respective partnership agreement of each Madryn Fund. Each transfer was made for no consideration.

Represents restricted stock units ("RSU") awarded to Avinash Amin as director compensation. Each RSU represents a contingent right to receive one share of the Issuer's common stock. Pursuant to the partnership agreements of each of Madryn Health Partners II, LP ("Health Partners"), Madryn Health Partners II (Cayman Master), LP ("Cayman Master") and Madryn Select Opportunities, LP ("Select Opportunities" and, together with Health Partners and Cayman Master, the "Madryn Funds"), Avinash Amin is deemed to hold the RSU for the benefit of the Madryn Funds, who are entitled to the shares of common stock underlying the RSUs upon vesting.

Represents shares of common stock held by Health Partners, for which Madryn Asset Management, LP ("Madryn") serves as the investment advisor.

Madryn Health Advisors II, LP ("Health Advisors"), as general partner of Health Partners and Cayman Master, and Madryn Health Advisors GP II, LLC, as general partner of Health Advisors, may be deemed to beneficially own the shares held directly by Health Partners and Cayman Master.

Each of the Reporting Persons disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest.

The reported transactions involved a transfer of shares received by Avinash Amin as director compensation to each of Madryn Health Partners II, LP ("Health Partners"), Madryn Health Partners II (Cayman Master), LP ("Cayman Master") and Madryn Select Opportunities, LP ("Select Opportunities") as provided for in each fund's respective partnership agreement. Each transfer was made for no consideration.

Represents shares of common stock transferred to Health Partners.

The reported transactions involved a transfer of shares received by Avinash Amin as director compensation to each of Madryn Health Partners II, LP ("Health Partners"), Madryn Health Partners II (Cayman Master), LP ("Cayman Master") and Madryn Select Opportunities, LP ("Select Opportunities") as provided for in each fund's respective partnership agreement. Each transfer was made for no consideration.

Represents shares of common stock transferred to Select Opportunities.

The reported transactions involved a transfer of shares received by Avinash Amin as director compensation to each of the Madryn Funds as provided for in the respective partnership agreement of each Madryn Fund. Each transfer was made for no consideration.

Represents restricted stock units ("RSU") awarded to Avinash Amin as director compensation. Each RSU represents a contingent right to receive one share of the Issuer's common stock. Pursuant to the partnership agreements of each of Madryn Health Partners II, LP ("Health Partners"), Madryn Health Partners II (Cayman Master), LP ("Cayman Master") and Madryn Select Opportunities, LP ("Select Opportunities" and, together with Health Partners and Cayman Master, the "Madryn Funds"), Avinash Amin is deemed to hold the RSU for the benefit of the Madryn Funds, who are entitled to the shares of common stock underlying the RSUs upon vesting.

Represents shares of common stock held by Cayman Master, for which Madryn serves as the investment advisor.

Madryn Health Advisors II, LP ("Health Advisors"), as general partner of Health Partners and Cayman Master, and Madryn Health Advisors GP II, LLC, as general partner of Health Advisors, may be deemed to beneficially own the shares held directly by Health Partners and Cayman Master.

Each of the Reporting Persons disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest.

The reported transactions involved a transfer of shares received by Avinash Amin as director compensation to each of Madryn Health Partners II, LP ("Health Partners"), Madryn Health Partners II (Cayman Master), LP ("Cayman Master") and Madryn Select Opportunities, LP ("Select Opportunities") as provided for in each fund's respective partnership agreement. Each transfer was made for no consideration.

Represents shares of common stock transferred to Cayman Master.

The reported transactions involved a transfer of shares received by Avinash Amin as director compensation to each of the Madryn Funds as provided for in the respective partnership agreement of each Madryn Fund. Each transfer was made for no consideration.

Represents restricted stock units ("RSU") awarded to Avinash Amin as director compensation. Each RSU represents a contingent right to receive one share of the Issuer's common stock. Pursuant to the partnership agreements of each of Madryn Health Partners II, LP ("Health Partners"), Madryn Health Partners II (Cayman Master), LP ("Cayman Master") and Madryn Select Opportunities, LP ("Select Opportunities" and, together with Health Partners and Cayman Master, the "Madryn Funds"), Avinash Amin is deemed to hold the RSU for the benefit of the Madryn Funds, who are entitled to the shares of common stock underlying the RSUs upon vesting.

Represents shares of common stock held by Select Opportunities, for which Madryn serves as the investment advisor.

Each of the Reporting Persons disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest.

Madryn Select Advisors, LP ("Select Advisors"), as general partner of Select Opportunities, and Madryn Select Advisors GP, LLC, as general partner of Select Advisors, may be deemed to beneficially own the shares held directly by Select Opportunities.

Represents a restricted stock unit ("RSU") award that vests on the earlier of (a) May 28, 2027 or (b) the Reporting Person's Board-approved separation of service from the Issuer or change in control of the Issuer, in each case subject to continuous service of the Reporting Person through such date.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

Represents a restricted stock unit ("RSU") award that vests on the earlier of (a) May 28, 2027 or (b) the Reporting Person's Board-approved separation of service from the Issuer or change in control of the Issuer, in each case subject to continuous service of the Reporting Person through such date.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

Represents restricted stock units ("RSU") awarded to Avinash Amin as director compensation. Each RSU represents a contingent right to receive one share of the Issuer's common stock. Pursuant to the partnership agreements of each of Madryn Health Partners II, LP ("Health Partners"), Madryn Health Partners II (Cayman Master), LP ("Cayman Master") and Madryn Select Opportunities, LP ("Select Opportunities" and, together with Health Partners and Cayman Master, the "Madryn Funds"), Avinash Amin is deemed to hold the RSU for the benefit of the Madryn Funds, who are entitled to the shares of common stock underlying the RSUs upon vesting.

Represents shares of common stock held by Select Opportunities, for which Madryn serves as the investment advisor.

Each of the Reporting Persons disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest.

Madryn Select Advisors, LP ("Select Advisors"), as general partner of Select Opportunities, and Madryn Select Advisors GP, LLC, as general partner of Select Advisors, may be deemed to beneficially own the shares held directly by Select Opportunities.

Represents a restricted stock unit ("RSU") award that vests on the earlier of (a) May 28, 2027 or (b) the Reporting Person's Board-approved separation of service from the Issuer or change in control of the Issuer, in each case subject to continuous service of the Reporting Person through such date.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

Represents a restricted stock unit ("RSU") award that vests on the earlier of (a) May 28, 2027 or (b) the Reporting Person's Board-approved separation of service from the Issuer or change in control of the Issuer, in each case subject to continuous service of the Reporting Person through such date.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

Represents restricted stock units ("RSU") awarded to Avinash Amin as director compensation. Each RSU represents a contingent right to receive one share of the Issuer's common stock. Pursuant to the partnership agreements of each of Madryn Health Partners II, LP ("Health Partners"), Madryn Health Partners II (Cayman Master), LP ("Cayman Master") and Madryn Select Opportunities, LP ("Select Opportunities" and, together with Health Partners and Cayman Master, the "Madryn Funds"), Avinash Amin is deemed to hold the RSU for the benefit of the Madryn Funds, who are entitled to the shares of common stock underlying the RSUs upon vesting.

Represents shares of common stock held by Cayman Master, for which Madryn serves as the investment advisor.

Madryn Health Advisors II, LP ("Health Advisors"), as general partner of Health Partners and Cayman Master, and Madryn Health Advisors GP II, LLC, as general partner of Health Advisors, may be deemed to beneficially own the shares held directly by Health Partners and Cayman Master.

Each of the Reporting Persons disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest.

Represents a restricted stock unit ("RSU") award that vests on the earlier of (a) May 28, 2027 or (b) the Reporting Person's Board-approved separation of service from the Issuer or change in control of the Issuer, in each case subject to continuous service of the Reporting Person through such date.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

Represents restricted stock units ("RSU") awarded to Avinash Amin as director compensation. Each RSU represents a contingent right to receive one share of the Issuer's common stock. Pursuant to the partnership agreements of each of Madryn Health Partners II, LP ("Health Partners"), Madryn Health Partners II (Cayman Master), LP ("Cayman Master") and Madryn Select Opportunities, LP ("Select Opportunities" and, together with Health Partners and Cayman Master, the "Madryn Funds"), Avinash Amin is deemed to hold the RSU for the benefit of the Madryn Funds, who are entitled to the shares of common stock underlying the RSUs upon vesting.

Represents shares of common stock held by Health Partners, for which Madryn Asset Management, LP ("Madryn") serves as the investment advisor.

Madryn Health Advisors II, LP ("Health Advisors"), as general partner of Health Partners and Cayman Master, and Madryn Health Advisors GP II, LLC, as general partner of Health Advisors, may be deemed to beneficially own the shares held directly by Health Partners and Cayman Master.

Each of the Reporting Persons disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest.

Represents a restricted stock unit ("RSU") award that vests on the earlier of (a) May 28, 2027 or (b) the Reporting Person's Board-approved separation of service from the Issuer or change in control of the Issuer, in each case subject to continuous service of the Reporting Person through such date.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

The price reported in Column 4 is a weighted average price, rounded to the nearest cent. These shares were purchased in multiple transactions at prices ranging from $1.27 to $1.36, rounded to the nearest cent, inclusive. Mr. Chernett undertakes to provide the Issuer and any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price such shares were purchased.

The price reported in Column 4 is a weighted average price, rounded to the nearest cent. These shares were purchased in multiple transactions at prices ranging from $1.50 to $1.52, rounded to the nearest cent, inclusive. Mr. Chernett undertakes to provide the Issuer and any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price such shares were purchased.

The price reported in Column 4 is a weighted average price, rounded to the nearest cent. These shares were purchased in multiple transactions at prices ranging from $1.56 to $1.59, rounded to the nearest cent, inclusive. Mr. Chernett undertakes to provide the Issuer and any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price such shares were purchased.

The price reported in Column 4 is a weighted average price, rounded to the nearest cent. These shares were purchased in multiple transactions at prices ranging from $1.23 to $1.26, rounded to the nearest cent, inclusive. Mr. Chernett undertakes to provide the Issuer and any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price such shares were purchased.

This amount corrects a clerical error in the Reporting Person's Form 4 previously filed on March 30, 2026, in which the number of shares beneficially owned by the Reporting Person was under-reported by 270 shares.

The price reported in Column 4 is a weighted average price, rounded to the nearest cent. These shares were purchased in multiple transactions at prices ranging from $1.28 to $1.41, rounded to the nearest cent, inclusive. Mr. Chernett undertakes to provide the Issuer and any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price such shares were purchased.

The price reported in Column 4 is a weighted average price, rounded to the nearest cent. These shares were purchased in multiple transactions at prices ranging from $1.38 to $1.42, rounded to the nearest cent, inclusive. Mr. Chernett undertakes to provide the Issuer and any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price such shares were purchased.

Represents a restricted stock unit ("RSU") award that vests in three equal annual installments beginning on March 23, 2027, in each case subject to continuous service of the Reporting Person through such date.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

The price reported in Column 4 is a weighted average price, rounded to the nearest cent. These shares were purchased in multiple transactions at prices ranging from $1.36 to $1.44, rounded to the nearest cent, inclusive. Mr. Chernett undertakes to provide the Issuer and any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price such shares were purchased.

The sales reported in this Form 4 were non-discretionary sales to satisfy the Reporting Person's tax withholding obligation upon vesting of a portion of a performance restricted stock unit award.

The price reported is a weighted average price. These shares were sold in multiple transactions at per share prices ranging from $1.48 to $1.20. The Reporting Person undertakes to provide upon request to the SEC staff, the Issuer, or any stockholder of the Issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

The Form 4 filed on March 24, 2026 inadvertently reported the disposition of 16,431 shares of common stock in connection with non-discretionary sales to satisfy the Reporting Person's tax withholding obligation upon vesting of a portion of a performance restricted stock unit award. However, the correct amount is 8,569 shares of common stock.

The price reported is a weighted average price. These shares were sold in multiple transactions at per share prices ranging from $1.48 to $1.20. The Reporting Person undertakes to provide upon request to the SEC staff, the Issuer, or any stockholder of the Issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

The sales reported in this Form 4 were non-discretionary sales to satisfy the Reporting Person's tax withholding obligation upon vesting of a portion of a performance restricted stock unit award.

The price reported is a weighted average price. These shares were sold in multiple transactions at per share prices ranging from $1.48 to $1.20. The Reporting Person undertakes to provide upon request to the SEC staff, the Issuer, or any stockholder of the Issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

The price reported in Column 4 is a weighted average price, rounded to the nearest cent. These shares were purchased in multiple transactions at prices ranging from $1.29 to $1.48, rounded to the nearest cent, inclusive. Mr. Chernett undertakes to provide the Issuer and any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price such shares were purchased.

The price reported in Column 4 is a weighted average price, rounded to the nearest cent. These shares were purchased in multiple transactions at prices ranging from $1.33 to $1.37, rounded to the nearest cent, inclusive. Mr. Chernett undertakes to provide the Issuer and any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price such shares were purchased.

Represents a restricted stock unit ("RSU") award that vests in three equal annual installments beginning on March 17, 2027, in each case subject to continuous service of the Reporting Person through such date.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

Common stock received for no consideration upon the satisfaction of performance criteria underlying an award of performance based restricted stock units.

Common stock received for no consideration upon the satisfaction of performance criteria underlying an award of performance based restricted stock units.

The price reported in Column 4 is a weighted average price, rounded to the nearest cent. These shares were purchased in multiple transactions at prices ranging from $0.91 to $1.31, rounded to the nearest cent, inclusive. Mr. Chernett undertakes to provide the Issuer and any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price such shares were purchased.

The sales reported in this Form 4 were non-discretionary sales to satisfy the Reporting Person's tax withholding obligation upon vesting of a portion of a restricted stock unit award.

The price reported is a weighted average price. These shares were sold in multiple transactions at per share prices ranging from $1.39 to $1.28. The Reporting Person undertakes to provide upon request to the SEC staff, the Issuer, or any stockholder of the Issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

The sales reported in this Form 4 were non-discretionary sales to satisfy the Reporting Person's tax withholding obligation upon vesting of a portion of a restricted stock unit award.

The price reported is a weighted average price. These shares were sold in multiple transactions at per share prices ranging from $1.38 to $1.31. The Reporting Person undertakes to provide upon request to the SEC staff, the Issuer, or any stockholder of the Issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

The sales reported in this Form 4 were non-discretionary sales to satisfy the Reporting Person's tax withholding obligation upon vesting of a portion of a restricted stock unit award.

The price reported is a weighted average price. These shares were sold in multiple transactions at per share prices ranging from $1.38 to $1.31. The Reporting Person undertakes to provide upon request to the SEC staff, the Issuer, or any stockholder of the Issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Represents a restricted stock unit ("RSU") award that vests in three equal annual installments beginning on February 23, 2027, in each case subject to continuous service of the Reporting Person through such date.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

Represents a restricted stock unit ("RSU") award that vests in three equal annual installments beginning on February 23, 2027, in each case subject to continuous service of the Reporting Person through such date.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

The sales reported in this Form 4 were non-discretionary sales to satisfy the Reporting Person's tax withholding obligation upon vesting of a portion of a restricted stock unit award.

The price reported is a weighted average price. These shares were sold in multiple transactions at per share prices ranging from $1.56 to $1.72. The Reporting Person undertakes to provide upon request to the SEC staff, the Issuer, or any stockholder of the Issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

The sales reported in this Form 4 were non-discretionary sales to satisfy the Reporting Person's tax withholding obligation upon vesting of a portion of a restricted stock unit award.

The price reported is a weighted average price. These shares were sold in multiple transactions at per share prices ranging from $1.56 to $1.72. The Reporting Person undertakes to provide upon request to the SEC staff, the Issuer, or any stockholder of the Issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

The sales reported in this Form 4 were non-discretionary sales to satisfy the Reporting Person's tax withholding obligation upon vesting of a portion of a restricted stock unit award.

The price reported is a weighted average price. These shares were sold in multiple transactions at per share prices ranging from $1.45 to $1.60. The Reporting Person undertakes to provide upon request to the SEC staff, the Issuer, or any stockholder of the Issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

The sales reported in this Form 4 were non-discretionary sales to satisfy the Reporting Person's tax withholding obligation upon vesting of a portion of a restricted stock unit award.

The price reported is a weighted average price. These shares were sold in multiple transactions at per share prices ranging from $1.45 to $1.60. The Reporting Person undertakes to provide upon request to the SEC staff, the Issuer, or any stockholder of the Issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Represents a restricted stock unit ("RSU") award that vests on the earlier of (i) June 30, 2027 and (ii) the termination of Mr. Macan's employment from the Issuer without cause.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

Represents a restricted stock unit ("RSU") award that vests on the earlier of (i) June 30, 2027 and (ii) the termination of Mr. Pfanstiel's employment from the Issuer without cause.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

Pursuant to the Issuer's non-employee directors compensation plan the Reporting Person elected to receive shares of the Issuer's Common Stock in lieu of a cash retainer.

Represents a restricted stock unit ("RSU") award that vested immediately upon the grant.

Each RSU represents a right to receive one share of the Issuer's common stock.