OBIO

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 18, 2025.

The price reported is a weighted average price. These shares were disposed in multiple transactions at prices ranging from $4.21 to $4.32. 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 disposed at each separate price within the range set forth in this footnote.

Represents the withholding of shares by the Issuer to satisfy tax withholding obligations in connection with vesting of RSUs. No shares were sold in the market as a result of the vesting of these RSUs and the satisfaction of tax withholding obligations.

Represents the withholding of shares by the Issuer to satisfy tax withholding obligations in connection with vesting of restricted stock units ("RSUs"). No shares were sold in the market as a result of the vesting of these RSUs and the satisfaction of tax withholding obligations.

Represents the withholding of shares by the Issuer to satisfy tax withholding obligations in connection with vesting of RSUs. No shares were sold in the market as a result of the vesting of these RSUs and the satisfaction of tax withholding obligations.

Represents the withholding of shares by the Issuer to satisfy tax withholding obligations in connection with vesting of RSUs. No shares were sold in the market as a result of the vesting of these RSUs and the satisfaction of tax withholding obligations.

The stock options will vest on the one year anniversary of the Grant Date, subject to the Reporting Person's continuous service through such date.

The stock options will vest on the one year anniversary of June 23rd, 2026 (the "Grant Date"), subject to the Reporting Person's continuous service through such date.

Represents an award of restricted stock units ("RSUs") awarded to the Reporting Person on June 23, 2026 (the "Grant Date"). Each RSU represents a contingent right to receive one share of Common Stock. The RSUs will vest on the one year anniversary of the Grant Date, subject to the Reporting Person's continuous service through such date.

The stock options will vest on the one year anniversary of June 23rd, 2026 (the "Grant Date"), subject to the Reporting Person's continuous service through such date.

Represents an award of restricted stock units ("RSUs") awarded to the Reporting Person on June 23, 2026 (the "Grant Date"). Each RSU represents a contingent right to receive one share of Common Stock. The RSUs will vest on the one year anniversary of the Grant Date, subject to the Reporting Person's continuous service through such date.

The stock options will vest on the one year anniversary of the Grant Date, subject to the Reporting Person's continuous service through such date.

Represents an award of restricted stock units ("RSUs") awarded to the Reporting Person on June 23, 2026 (the "Grant Date"). Each RSU represents a contingent right to receive one share of Common Stock. The RSUs will vest on the one year anniversary of the Grant Date, subject to the Reporting Person's continuous service through such date.

Represents an award of restricted stock units ("RSUs") awarded to the Reporting Person on June 23, 2026 (the "Grant Date"). Each RSU represents a contingent right to receive one share of Common Stock. The RSUs will vest on the one year anniversary of the Grant Date, subject to the Reporting Person's continuous service through such date.

The stock options will vest on the one year anniversary of the Grant Date, subject to the Reporting Person's continuous service through such date.

Represents the withholding of shares by the Issuer to satisfy tax withholding obligations in connection with vesting of restricted stock units ("RSUs"). No shares were sold in the market as a result of the vesting of these RSUs and the satisfaction of tax withholding obligations.

Represents the withholding of shares by the Issuer to satisfy tax withholding obligations in connection with vesting of restricted stock units ("RSUs"). No shares were sold in the market as a result of the vesting of these RSUs and the satisfaction of tax withholding obligations.

Represents the withholding of shares by the Issuer to satisfy tax withholding obligations in connection with vesting of restricted stock units ("RSUs"). No shares were sold in the market as a result of the vesting of these RSUs and the satisfaction of tax withholding obligations.

The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $3.80 to $3.91. 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 purchased at each separate price within the range set forth in this footnote.

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 18, 2025.

The price reported is a weighted average price. These shares were disposed in multiple transactions at prices ranging from $3.81 to $4.01. 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 disposed at each separate price within the range set forth in this footnote.

Represents the withholding of shares by the Issuer to satisfy tax withholding obligations in connection with vesting of restricted stock units ("RSUs"). No shares were sold in the market as a result of the vesting of these RSUs and the satisfaction of tax withholding obligations.

Represents the withholding of shares by the Issuer to satisfy tax withholding obligations in connection with vesting of restricted stock units ("RSUs"). No shares were sold in the market as a result of the vesting of these RSUs and the satisfaction of tax withholding obligations.

The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $3.75 to $3.76. 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 purchased at each separate price within the range set forth in this footnote.

The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $3.75 to $3.79. 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 purchased at each separate price within the range set forth in this footnote.

The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $3.70 to $4.03. 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 purchased at each separate price within the range set forth in this footnote.

The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $4.10 to $4.14. 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 purchased at each separate price within the range set forth in this footnote.

On April 27, 2026, the RTW Funds exercised Pre-Funded Warrants to purchase an aggregate of 1,250,032 shares of the Issuer's common stock for $0.0001 a share. The RTW Funds exercised the Pre-Funded Warrants on a cashless basis, resulting in the Issuer's withholding 32 of such shares to satisfy the exercise price of the Pre-Funded Warrants, and the issuance to the RTW Funds of an aggregate of 1,250,000 shares.

Held by certain affiliated funds (the "RTW Funds") managed by RTW Investments, LP ("RTW"). Roderick Wong, M.D. serves as the Managing Partner and Chief Investment Officer of RTW. The Reporting Persons disclaim beneficial ownership of the reported securities for purposes of Section 16 under the Securities Exchange Act of 1934, as amended, except to the extent of their pecuniary interest therein.

On April 27, 2026, the RTW Funds exercised Pre-Funded Warrants to purchase an aggregate of 1,250,032 shares of the Issuer's common stock for $0.0001 a share. The RTW Funds exercised the Pre-Funded Warrants on a cashless basis, resulting in the Issuer's withholding 32 of such shares to satisfy the exercise price of the Pre-Funded Warrants, and the issuance to the RTW Funds of an aggregate of 1,250,000 shares.

The Pre-Funded Warrants have no expiration date and are exercisable immediately. Notwithstanding the foregoing, the RTW Funds shall not be entitled to exercise the Pre-Funded Warrants to the extent that it would cause the aggregate number of shares of Common Stock beneficially owned by the RTW Funds, together with their Attribution Parties (as defined in the Pre-Funded Warrants), to exceed 19.99% of the total number of issued and outstanding shares of Common Stock of the Issuer following such exercise.

Held by certain affiliated funds (the "RTW Funds") managed by RTW Investments, LP ("RTW"). Roderick Wong, M.D. serves as the Managing Partner and Chief Investment Officer of RTW. The Reporting Persons disclaim beneficial ownership of the reported securities for purposes of Section 16 under the Securities Exchange Act of 1934, as amended, except to the extent of their pecuniary interest therein.

On April 27, 2026, the RTW Funds exercised Pre-Funded Warrants to purchase an aggregate of 1,250,032 shares of the Issuer's common stock for $0.0001 a share. The RTW Funds exercised the Pre-Funded Warrants on a cashless basis, resulting in the Issuer's withholding 32 of such shares to satisfy the exercise price of the Pre-Funded Warrants, and the issuance to the RTW Funds of an aggregate of 1,250,000 shares.

Held by certain affiliated funds (the "RTW Funds") managed by RTW Investments, LP ("RTW"). Roderick Wong, M.D. serves as the Managing Partner and Chief Investment Officer of RTW. The Reporting Persons disclaim beneficial ownership of the reported securities for purposes of Section 16 under the Securities Exchange Act of 1934, as amended, except to the extent of their pecuniary interest therein.

Represents the withholding of shares by the Issuer to satisfy tax withholding obligations in connection with vesting of restricted stock units ("RSUs"). No shares were sold in the market as a result of the vesting of these RSUs and the satisfaction of tax withholding obligations.

Represents the withholding of shares by the Issuer to satisfy tax withholding obligations in connection with vesting of restricted stock units ("RSUs"). No shares were sold in the market as a result of the vesting of these RSUs and the satisfaction of tax withholding obligations.

Represents the withholding of shares by the Issuer to satisfy tax withholding obligations in connection with vesting of restricted stock units ("RSUs"). No shares were sold in the market as a result of the vesting of these RSUs and the satisfaction of tax withholding obligations.

The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $4.28 to $4.30. 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 purchased at each separate price within the range set forth in this footnote.

Represents an award of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of Common Stock. The RSUs vest over a three-year period as follows: (i) 25% of the shares will vest 18 months after February 12, 2026 (the "Issue Date"), (ii) 25% of the shares will vest 24 months after the Issue Date, (iii) 25% of the shares will vest 30 months after the Issue Date and (iv) 25% of the shares will vest 36 months after the Issue Date, subject to the Reporting Person's continuous service through such dates.

Represents an award of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of Common Stock. The RSUs vest over a three-year period as follows: (i) 25% of the shares will vest 18 months after February 12, 2026 (the "Issue Date"), (ii) 25% of the shares will vest 24 months after the Issue Date, (iii) 25% of the shares will vest 30 months after the Issue Date and (iv) 25% of the shares will vest 36 months after the Issue Date, subject to the Reporting Person's continuous service through such dates.

The stock options will vest as follows: (i) 25% of the stock options will vest on February 12, 2027 (the "Vesting Commencement Date") and (ii) the remaining 75% stock options will vest in equal installments every three months on the same day of the month as the Vesting Commencement Date, starting on May 12, 2027, subject to the Reporting Person's continuous service through such dates.

Represents an award of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of Common Stock. The RSUs vest over a three-year period as follows: (i) 25% of the shares will vest 18 months after February 12, 2026 (the "Issue Date"), (ii) 25% of the shares will vest 24 months after the Issue Date, (iii) 25% of the shares will vest 30 months after the Issue Date and (iv) 25% of the shares will vest 36 months after the Issue Date, subject to the Reporting Person's continuous service through such dates.

Represents the withholding of shares by the Issuer to satisfy tax withholding obligations in connection with vesting of restricted stock units. No shares were sold in the market as a result of the vesting of these restricted stock units and the satisfaction of tax withholding obligations.

This date represents the date of vesting of a performance stock option granted on April 23, 2025.

The stock option vests over a four-year period as follows: 25% on the April 23, 2026 (the "Vesting Commencement Date") with the remaining 75% vesting in equal installments every three months thereafter on the same day of the month as the Vesting Commencement Date over a three-year period, commencing in the third month after the Vesting Commencement Date.

Represents the withholding of shares by the Issuer to satisfy tax withholding obligations in connection with vesting of restricted stock units. No shares were sold in the market as a result of the vesting of these restricted stock units and the satisfaction of tax withholding obligations.

Represents the withholding of shares by the Issuer to satisfy tax withholding obligations in connection with vesting of restricted stock units. No shares were sold in the market as a result of the vesting of these restricted stock units and the satisfaction of tax withholding obligations.

Represents the withholding of shares by the Issuer to satisfy tax withholding obligations in connection with vesting of restricted stock units. No shares were sold in the market as a result of the vesting of these restricted stock units and the satisfaction of tax withholding obligations.

Represents the withholding of shares by the Issuer to satisfy tax withholding obligations in connection with vesting of restricted stock units. No shares were sold in the market as a result of the vesting of these restricted stock units and the satisfaction of tax withholding obligations.

Represents the withholding of shares by the Issuer to satisfy tax withholding obligations in connection with vesting of restricted stock units. No shares were sold in the market as a result of the vesting of these restricted stock units and the satisfaction of tax withholding obligations.

Represents the withholding of shares by the Issuer to satisfy tax withholding obligations in connection with vesting of restricted stock units. No shares were sold in the market as a result of the vesting of these restricted stock units and the satisfaction of tax withholding obligations.

Represents the withholding of shares by the Issuer to satisfy tax withholding obligations in connection with vesting of restricted stock units. No shares were sold in the market as a result of the vesting of these restricted stock units and the satisfaction of tax withholding obligations.

Represents the withholding of shares by the Issuer to satisfy tax withholding obligations in connection with vesting of restricted stock units. No shares were sold in the market as a result of the vesting of these restricted stock units and the satisfaction of tax withholding obligations.

The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $4.06 to $4.10. 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 purchased at each separate price within the range set forth in this footnote.

Represents the withholding of shares by the Issuer to satisfy tax withholding obligations in connection with vesting of restricted stock units. No shares were sold in the market as a result of the vesting of these restricted stock units and the satisfaction of tax withholding obligations.

Represents the withholding of shares by the Issuer to satisfy tax withholding obligations in connection with vesting of restricted stock units. No shares were sold in the market as a result of the vesting of these restricted stock units and the satisfaction of tax withholding obligations.