Guy Levy - 30 Sep 2021 Form 4 Insider Report for BioAtla, Inc. (BCAB)

Footnote F1

The securities reported in this row are held by Soleus Capital Master Fund, L.P. ("Master Fund"). Soleus Capital, LLC is the sole general partner of Master Fund and thus holds voting and dispositive power over the shares held by Master Fund. Soleus Capital Group, LLC is the sole managing member of Soleus Capital, LLC. Mr. Guy Levy is the sole managing member of Soleus Capital Group, LLC. Each of Soleus Capital Group, LLC, Soleus Capital, LLC and Mr. Guy Levy disclaims beneficial ownership of these securities held by Master Fund and this report shall not be deemed an admission that they are the beneficial owners of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interests therein.

Footnote F2

The securities reported in this row are owned directly by Soleus Private Equity Fund I, L.P. ("Soleus PE"). Soleus Private Equity GP I, LLC ("Soleus GP") is the sole general partner of Soleus PE. Soleus GP holds voting and dispositive power over the shares held by Soleus PE. Soleus PE GP I, LLC ("Soleus PE GP") is the sole manager of Soleus GP. Mr. Guy Levy is the sole managing member of Soleus PE GP. Each of Mr. Guy Levy, Soleus PE GP and Soleus GP disclaims beneficial ownership of these securities held by Soleus PE and this report shall not be deemed an admission that they are the beneficial owners of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interests therein.

Footnote F3

The securities reported in this row are held by Soleus BA SPV, LLC ("Soleus SPV "). Soleus GP is the sole managing member of Soleus SPV. Soleus GP holds voting and dispositive power over the shares held by Soleus SPV. Soleus PE GP is the sole manager of Soleus GP. Mr. Guy Levy is the sole managing member of Soleus PE GP. Each of Soleus GP, Soleus PE GP and Mr. Guy Levy disclaims beneficial ownership of these securities held by Soleus SPV and this report shall not be deemed an admission that they are the beneficial owners of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interests therein.

Footnote F4

Consists of 14,871 restricted stock units ("RSUs"). 33.3% of the RSUs vest on December 7, 2021, with the remainder vesting in 24 substantially equal monthly installments thereafter, subject to Mr. Guy Levy's continued service through the applicable vesting dates.

Footnote F5

The shares of common stock were purchased from the issuer in a transaction exempt from Section 16(b) of the Securities Exchange Act of 1934, as amended, pursuant to Rule 16b-3(d) promulgated thereunder.