Upstream Bio Inc. (UPB) - Insider Holders & Insider Ownership

List of insiders holdings for Upstream Bio Inc.:
  1. Shares directly owned by the insider.
  2. Shares indirectly owned by the insider.
  3. Total shares owned by the insider (sum of shares directly and indirectly owned).
  4. Total market value if available.
  5. Shares are not adjusted for stock split.
"Insiders might sell their shares for any number of reasons, but they buy them for only one: they think the price will rise"
- Peter Lynch
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#Insider Holder NameReport
Date Time		Shares Owned
Directly
Indirectly		Total
Shares Owned		Filing
1AI Upstream LLC
AI Biotechnology LLC
Access Industries Holdings LLC
ACCESS INDUSTRIES MANAGEMENT LLC
Blavatnik Len
10% Owner		2024-10-22 16:06:275,494,410
0		5,494,410Form 13D
2ORBIMED ADVISORS LLC
OrbiMed Capital GP VIII LLC
OrbiMed Advisors Israel II Ltd
OrbiMed Israel GP II L.P.
Director
10% Owner		2024-10-17 16:17:520
4,554,873		4,554,873Form 4
3Wellington Biomedical Innovation Master Investors (Cayman) II L.P.
10% Owner		2024-10-15 19:21:47894,733
0		894,733Form 4
4Sutherland Everett Rand
Chief Executive Officer		2026-03-17 17:00:4572,907
0		72,907Form 4
5Deykin Aaron
Chief Medical Officer		2026-03-17 17:02:5732,687
0		32,687Form 4
6GRAY MICHAEL
CFO and COO		2026-03-17 17:03:3329,648
0		29,648Form 4
7Houghton Adam
Chief Business Officer		2026-03-17 16:59:4624,301
0		24,301Form 4
8Ratcliffe Liam
Director		2025-06-12 16:17:2017,096
0		17,096Form 4
9Fleming Harold Edward
Director		2025-06-12 16:17:2117,096
0		17,096Form 4
10Beckman Daniella
Director		2025-06-12 16:17:2917,096
0		17,096Form 4
11Ruddy Marcella K.
Director		2025-06-12 16:17:3017,096
0		17,096Form 4
12Chimovits Erez
Director		2025-06-12 16:17:3117,096
0		17,096Form 4
13Renaud Ronald C JR
Director		2025-06-12 16:17:3317,096
0		17,096Form 4
14Ambrose Allison
General Counsel		2026-03-17 17:00:2316,525
0		16,525Form 4