Ryali Sriram 4

4 · Caribou Biosciences, Inc. · Filed Feb 20, 2026

AI-generated summary of this filing

Updated Feb 20, 2026

Caribou (CRBU) CFO Ryali Sriram Receives RSU & Option Awards

What Happened

Ryali Sriram, Chief Financial Officer of Caribou Biosciences (CRBU), received equity awards on February 20, 2026: 55,000 restricted stock units (RSUs) and 247,500 stock option-type derivative awards. Both grants were issued at $0.00 per share, so no cash changed hands at grant.

Key Details

Transaction date: 2026-02-20. Transaction code: A (grant/award).
Grants: 55,000 RSUs (F1) and 247,500 options/derivative awards (F2), grant price $0.00; total immediate value shown as $0 in the filing.
Vesting for RSUs (F1): vest in four equal annual installments beginning Feb 20, 2027; each tranche will be settled in stock within 30 days of the vesting date, contingent on continued service.
Vesting for options (F2): 1/48 of the option vests monthly (monthly vesting over 4 years), fully vested Feb 20, 2030, subject to continued service.
Shares owned after the reported transactions: not specified in the provided filing details.
Filing timeliness: filing date equals transaction date (2026-02-20); no late filing indicator provided.

Context

These were compensation grants, not open-market purchases or sales. Grants at $0 are typical equity compensation to executives and do not represent an immediate cash outlay or sale of stock.
RSUs convert to actual shares only as they vest; options will vest monthly and may require exercise later (which could have a strike price and tax implications when exercised or sold). These awards are conditional on continued employment and do not by themselves indicate buying or selling sentiment.

Form 4

Period: 2026-02-20

Chief Financial Officer

Transactions

Award
Common Stock
[F1]
2026-02-20+55,000→ 72,360 total
Award
Option to purchase Common Stock
[F2]
2026-02-20+247,500→ 247,500 total
Exercise: $1.80Exp: 2036-02-19→ Common Stock (247,500 underlying)

Footnotes (2)

[F1]This reflects restricted stock units ("RSUs") that vest in four equal annual installments beginning on February 20, 2027, subject to the reporting person continuing to provide service to the Issuer through the applicable vesting dates. The RSUs will be settled in stock within 30 days after each vesting date.
[F2]1/48 of the total number of shares subject to this option will vest on each monthly anniversary of the grant date such that the option will be fully vested on February 20, 2030, subject to the reporting person continuing to provide service to the Issuer through each such vesting date.

Signature

/s/ Barbara G. McClung, as attorney-in-fact|2026-02-20

1 file