ONT · Onterris, Inc.

The price reported in Column 4 is a weighted average price. These shares of common stock of the Issuer were purchased in multiple transactions by the Reporting Person at prices ranging from $17.00 to $17.46, inclusive. The Reporting Person undertakes to provide upon request by the Commission staff, the Issuer, or a security holder of the Issuer full information regarding the number of shares of common stock acquired at each separate price within the range.

The price reported in Column 4 is a weighted average price. These shares of common stock of the Issuer were purchased in multiple transactions by the Reporting Person at prices ranging from $15.84 to $16.00, inclusive. The Reporting Person undertakes to provide upon request by the Commission staff, the Issuer, or a security holder of the Issuer full information regarding the number of shares of common stock acquired at each separate price within the range.

50% of the shares subject to the option vested on June 9, 2017 and the remaining 50% vested on June 9, 2019.

50% of the shares subject to the option vested on September 11, 2017 and the remaining 50% vested on September 11, 2019.

50% of the shares subject to the option vested on September 11, 2017 and the remaining 50% vested on September 11, 2019.

The price reported in Column 4 is a weighted average price. These shares of common stock of the Issuer were sold in multiple transactions by the Reporting Person at prices ranging from $25.19 to $25.90, inclusive. The Reporting Person undertakes to provide upon request by the Commission staff, the Issuer, or a security holder of the Issuer full information regarding the number of shares of common stock sold at each separate price within the range.

The Reporting Person was granted restricted stock units ("RSUs") which represent a contingent right to receive one share of Common Stock for each RSU. 1/3 of the RSUs will vest on each anniversary of the grant, provided that the Reporting Person remains in continuous service on each vesting date.

50% of the shares subject to the option vested on June 9, 2017 and the remaining 50% vested on June 9, 2019.

The price reported in Column 4 is a weighted average price. These shares of common stock of the Issuer were sold in multiple transactions by the Reporting Person at prices ranging from $27.50 to $27.56, inclusive. The Reporting Person undertakes to provide upon request by the Commission staff, the Issuer, or a security holder of the Issuer full information regarding the number of shares of common stock sold at each separate price within the range.

50% of the shares subject to the option vested on June 9, 2017 and the remaining 50% vested on June 9, 2019.

The price reported in Column 4 is a weighted average price. These shares of common stock of the Issuer were sold in multiple transactions by the Reporting Person at prices ranging from $28.00 to $28.06, inclusive. The Reporting Person undertakes to provide upon request by the Commission staff, the Issuer, or a security holder of the Issuer full information regarding the number of shares of common stock sold at each separate price within the range.

50% of the shares subject to the option vested on June 9, 2017 and the remaining 50% vested on June 9, 2019.

The price reported in Column 4 is a weighted average price. These shares of common stock of the Issuer were sold in multiple transactions by the Reporting Person at prices ranging from $28.13 to $28.495, inclusive. The Reporting Person undertakes to provide upon request by the Commission staff, the Issuer, or a security holder of the Issuer full information regarding the number of shares of common stock sold at each separate price within the range.

50% of the shares subject to the option vested on June 9, 2017 and the remaining 50% vested on June 9, 2019.

The price reported in Column 4 is a weighted average price. These shares of common stock of the Issuer were sold in multiple transactions by the Reporting Person at prices ranging from $29.635 to $29.905, inclusive. The Reporting Person undertakes to provide upon request by the Commission staff, the Issuer, or a security holder of the Issuer full information regarding the number of shares of common stock sold at each separate price within the range.

The price reported in Column 4 is a weighted average price. These shares of common stock of the Issuer were sold in multiple transactions by the Reporting Person at prices ranging from $28.55 to $29.53, inclusive. The Reporting Person undertakes to provide upon request by the Commission staff, the Issuer, or a security holder of the Issuer full information regarding the number of shares of common stock sold at each separate price within the range.

This transaction was made pursuant to a contract, instruction or written plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

Withholding of shares of common stock to satisfy tax withholding obligations in connection with the vesting of restricted stock units.

Withholding of shares of common stock to satisfy tax withholding obligations in connection with the vesting of restricted stock units.

Withholding of shares of common stock to satisfy tax withholding obligations in connection with the vesting of restricted stock units.

Withholding of shares of common stock to satisfy tax withholding obligations in connection with the vesting of restricted stock units.

50% of the shares subject to the option vested on September 11, 2017 and the remaining 50% vested on September 11, 2019.

The price reported in Column 4 is a weighted average price. These shares of common stock of the Issuer were sold in multiple transactions by the Reporting Person at prices ranging from $23.720 to $24.620, inclusive. The Reporting Person undertakes to provide upon request by the Commission staff, the Issuer, or a security holder of the Issuer full information regarding the number of shares of common stock sold at each separate price within the range.

50% of the shares subject to the option vested on September 11, 2017 and the remaining 50% vested on September 11, 2019.

The price reported in Column 4 is a weighted average price. These shares of common stock of the Issuer were sold in multiple transactions by the Reporting Person at prices ranging from $24.060 to $25.040, inclusive. The Reporting Person undertakes to provide upon request by the Commission staff, the Issuer, or a security holder of the Issuer full information regarding the number of shares of common stock sold at each separate price within the range.

The price reported in Column 4 is a weighted average price. These shares of common stock of the Issuer were sold in multiple transactions by the Reporting Person at prices ranging from $25.060 to $26.045, inclusive. The Reporting Person undertakes to provide upon request by the Commission staff, the Issuer, or a security holder of the Issuer full information regarding the number of shares of common stock sold at each separate price within the range.