COLUMN GROUP III GP, LP - 26 Mar 2025 Form 4 Insider Report for Surrozen, Inc./DE (SRZN)

Footnote F1

Represents a price per unit, consisting of (i) $11.5375 per share of the Issuer's Common Stock and (ii) $0.0625 attributable to accompanying warrants to purchase shares of the Issuer's Common Stock, which The Column Group III, LP ("TCG III LP"), The Column Group III-A, LP ("TCG III-A LP") and The Column Group Opportunity III, LP ("TCG Opportunity III LP") purchased in the Issuer's private placement on March 24, 2025 (the "2025 Private Placement").

Footnote F2

The amount beneficially owned by the Reporting Persons, has been updated to correct an administrative error in previously reported Form 4s.

Footnote F3

The securities are directly held by TCG III LP. The Column Group III GP, LP ("TCG III GP") is the general partner of TCG III LP and may be deemed to have voting, investment and dispositive power with respect to these securities. The managing partners of TCG III GP are David Goeddel, Peter Svennilson and Tim Kutzkey, a member of the Issuer's board of directors (collectively, the "Managing Partners"). The Managing Partners may be deemed to share voting and investment power with respect to such securities. TCG III GP and each of the Managing Partners disclaim beneficial ownership of these securities, except to the extent of their respective pecuniary interest in such securities.

Footnote F4

The securities are directly held by TCG III-A LP. TCG III GP is the general partner of TCG III-A LP and may be deemed to have voting, investment and dispositive power with respect to these securities. The managing partners of TCG III GP are the Managing Partners. The Managing Partners may be deemed to share voting and investment power with respect to such securities. TCG III GP and each of the Managing Partners disclaim beneficial ownership of these securities, except to the extent of their respective pecuniary interest in such securities.

Footnote F5

The securities are directly held by TCG Opportunity III LP. The Column Group Opportunity III GP, LP ("TCG Opportunity III GP LP") is the general partner of TCG Opportunity III LP and may be deemed to have voting, investment and dispositive power with respect to these securities. TCG Opportunity III GP, LLC ("TCG Opportunity III GP LLC") is the general partner of TCG Opportunity III GP LP and the ultimate general partner of TCG Opportunity III LP and may be deemed to have voting, investment and dispositive power with respect to these securities. The managing members of TCG Opportunity III GP LLC are David Goeddel, Peter Svennilson and Tim Kutzkey, a member of the Issuer's board of directors (collectively, the "Managing Members"). TCG Opportunity III GP LP, TCG Opportunity III GP LLC and each of the Managing Members disclaim beneficial ownership of these securities, except to the extent of their respective pecuniary interest in such securities.

Footnote F6

These Series A Common Warrants were initially purchased as part of a unit, consisting of (i) $14.25 per share of the Issuer's Common Stock and (ii) $1.25 attributable to accompanying warrants to purchase shares of the Issuer's Common Stock, which TCG III LP and TCG III-A LP purchased in the Issuer's private placement on April 4, 2024. The exercise price of these Series A Common Warrants was reduced to $11.54 per share in connection with the 2025 Private Placement. These Series A Common Warrants are immediately exercisable and expire on April 4, 2029.

Footnote F7

These Series B Common Warrants were initially purchased as part of a unit, consisting of (i) $14.25 per share of the Issuer's Common Stock and (ii) $1.25 attributable to accompanying warrants to purchase shares of the Issuer's Common Stock, which TCG III LP and TCG III-A LP purchased in the Issuer's private placement on April 4, 2024. The exercise price of these Series B Common Warrants was reduced to $11.54 per share in connection with the 2025 Private Placement. These Series B Common Warrants are exercisable immediately upon issuance and expire on the fifth trading day following the Issuer's announcement that (i) it has completed the enrollment of at least 15 patients with a 30-day mortality rate less than 30% in the Issuer's SZN-043 Phase 1b clinical trial for the treatment of severe alcohol-associated hepatitis, with no recommended changes by the Safety Review Committee to the study design, including changes related to dose or schedule,

Footnote F8

(Continued from footnote 7) and (ii) Safety Review Committee approval for the Issuer to advance to a higher dose cohort.

Footnote F9

These Series C Common Warrants and Series D Common Warrants were cancelled by the Issuer in connection with the 2025 Private Placement.

Footnote F10

These Series E Common Warrants are exercisable immediately and will not expire until exercised in full (subject to certain beneficial ownership limitations).

Footnote F11

Each Second Tranche Unit consists of (a) one share of the Issuer's Common Stock and (b) one half of a Series E Common Warrant to purchase shares of Common Stock. The Second Tranche Units may be purchased in a second closing (the "Second Closing"). The Second Closing is contingent upon the public announcement of the receipt of clearance from the U.S. Food and Drug Administration on or prior to October 31, 2026 of the Issuer's Investigation New Drug Application for SZN-8141 (the "Second Closing Milestone"); provided, that the Second Closing may not occur prior to six months and one day following March 26, 2025. If the Issuer terminates its SZN-8141 program prior to October 31, 2026, then the Issuer is required to provide written notice to each purchaser of Second Tranche Units no later than two trading days following such termination (the "Termination Notice").

Footnote F12

(Continued from footnote 11) Each purchaser of Second Tranche Units will have the right, but not the obligation, for 30 calendar days following the receipt of the Termination Notice, upon written notice to the Issuer, to purchase the Second Tranche Units subscribed for by such purchaser in the Second Closing. In addition, at any time prior to October 31, 2026 or the date of the Termination Notice (if earlier), in lieu of the requirement to purchase Second Tranche Units in the Second Closing, each purchaser of Second Tranche Units has the right, but not the obligation, upon five trading days' prior written notice to the Issuer to purchase all (but not a portion) of the Second Tranche Units subscribed for by such purchaser in the Second Closing.

Footnote F13

Consists of (a) 485,830 shares of the Issuer's Common Stock and (b) 242,915 Series E Warrants to purchase shares of the Issuer's Common Stock.

Footnote F14

Consists of (a) 548,653 shares of the Issuer's Common Stock and (b) 274,327 Series E Warrants to purchase shares of the Issuer's Common Stock.

Footnote F15

Consists of (a) 517,241 shares of the Issuer's Common Stock and (b) 258,620 Series E Warrants to purchase shares of the Issuer's Common Stock.