SEC Form 4 · accession 0001193125-26-268166
Upstream Bio, Inc. · UPB
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
Daniella Beckman
Director
Period of report
Jun 9, 2026
Accepted (ET)
Jun 11, 2026 · 8:00 pm EDT
Rule 10b5-1 plan
box not checked
Issuer CIK
0002022626
Table I — non-derivative securities
No Table I lines on this filing.
Table II — derivative securities
| Security | Conv. / exercise price | Date | Code | Shares | A/D | Exercisable | Expires | Underlying | Underlying shares | Owned after | D/I |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Stock Option (Right to Buy)F1 | $6.69 | Jun 9, 2026 | A | 17,096 | A | — | Jun 8, 2036 | Common Stock | 17,096 | 17,096 | D |
Explanation of responses
- F1The shares underlying this option shall vest in full upon the earlier of (i) June 9, 2027 and (ii) the date of the next Annual Meeting of Stockholders of the Issuer, subject to the Reporting Person's continued service on such vesting date.