← All stocks

Upstream Bio, Inc.

UPB Net buying

CIK 0002022626 #3343 in the set updated 17 Sep 2026

Bought (120 mo)

$48.03M

out of their own pocket, the only kind of buying there is

Sold (120 mo)

$77.19K

$0.00 on a plan · $0.00 straight out of an exercise

Sold at will

$77.19K

10 of 10 sales

Net

+$47.95M

+$47.95M against sales at will

By person

9 insiders · 15 transactions

Insider

Role

Bought

Sold

Net

Holding

Of company

Worth

Change

AI Upstream LLC entity

10% owner

$19.98M (1)

—

+$19.98M

5,494,410

10.03%

$33.52M

—

Chimovits Erez

Director

$14.03M (2)

—

+$14.03M

4,554,873

8.32%

$27.78M

+3,693%

ORBIMED ADVISORS LLC entity

Director

$14.03M (2)

—

+$14.03M

4,554,873

8.32%

$27.78M

+3,693%

Sutherland Everett Rand

Chief Executive Officer

—

$32.22K (2)

−$32.22K

70,812

0.1293%

$431.95K

—

Deykin Aaron

Chief Medical Officer

—

$13.76K (2)

−$13.76K

33,197

0.0606%

$202.50K

+1,012%

GRAY MICHAEL

CFO and COO

—

$13.12K (2)

−$13.12K

28,795

0.0526%

$175.65K

—

Houghton Adam

Chief Business Officer

—

$10.76K (2)

−$10.76K

23,601

0.0431%

$143.97K

—

Ambrose Allison

General Counsel

—

$7.32K (2)

−$7.32K

16,048

0.0293%

$97.89K

—

Wellington Biomedical Innovation Master Investors (Cayman) II L.P.

10% owner

—

894,733

1.63%

$5.46M

—

Individual transactions

Nothing of that kind in this period.

What was left out

Form 4 filings counted 43

Amendments (4/A) skipped 0

Filings about a different issuer 0

Unreadable filings 0

Joint filings 2

Sales on a Rule 10b5-1 plan 0

Sales straight out of an exercise 0

Sales at will 10

Transactions with no price 0

Shares from compensation/vesting 12,613,221

History held since 15 Oct 2024