CLYM

insider transactions

Climb Bio, Inc. — buys & sells by directors, officers and 10% owners (SEC Form 4).

30D 90D 1Y

Cluster buy signal: 2 different insiders made open-market purchases in the last 365 days, totalling $779.6K.

Net shares · 365d

+151.1K

321.7K buy · 170.6K sell

Net value · 365d

-$124.5K

$779.6K in · $904.1K out

Sentiment · 365d

Net buying

46% buying · 54% selling

Open-market trades · 365d

321.7K buy · 170.6K sell

Net buy / sell volume

Tap or hover the chart for daily net volume. Green = net buying, red = net selling.

All transactions

Grant·A
Jun 5, 26

RA CAPITAL MANAGEMENT, L.P.

Director, 10% Owner

$0

40.0K sh

Own New
Grant·A
Jun 5, 26

Levin Andrew David

Director

$0

40.0K sh

Own New
Grant·A
Jun 5, 26

Drapkin Kimberlee C

Director

$0

40.0K sh

Own New
Grant·A
Jun 5, 26

WILLIAMS DOUGLAS E

Director

$0

40.0K sh

Own New
Grant·A
Jun 5, 26

Cumbo Alexander

Director

$0

40.0K sh

Own New
Grant·A
Jun 5, 26

Thomas Stephen Basil

Director

$0

40.0K sh

Own New
Grant·A
Jun 5, 26

Dunn Judith

Director

$0

40.0K sh

Own New
Grant·A
Apr 29, 26

RA CAPITAL MANAGEMENT, L.P.

Director, 10% Owner

$20.0M

2.1M sh · $9.50

Own +10%
Sell·S
Feb 26, 26

Thomas Stephen Basil

Director · 10b5-1

$114.4K

16.3K sh · $7.01

Own -10%
Sell·S
Feb 25, 26

Thomas Stephen Basil

Director · 10b5-1

$235.8K

33.7K sh · $7.00

Own -16%
Sell·S
Feb 13, 26

Thomas Stephen Basil

Director · 10b5-1

$58.1K

10.0K sh · $5.81

Own -5%
Sell·S
Feb 12, 26

Thomas Stephen Basil

Director · 10b5-1

$470.7K

90.0K sh · $5.23

Own -30%
Grant·A
Jan 6, 26

Driscoll Cindy KEY

Senior Vice President, Finance

$0

100.0K sh

Own New
Grant·A
Jan 6, 26

Brennan Aoife KEY

President and CEO

$0

700.0K sh

Own New
Grant·A
Jan 6, 26

Wilson Perrin Megan

Chief Business Officer

$0

300.0K sh

Own New
Grant·A
Jan 6, 26

ALTSCHULLER Susan KEY

Chief Financial Officer

$0

142.5K sh

Own New
Buy·P
Jan 5, 26

RA Capital Healthcare Fund LP

Director,TenPercentOwner

$24.9K

7.1K sh · $3.50

Own +0%
Buy·P
Dec 12, 25

Kolchinsky Peter

Director,TenPercentOwner

$290.2K

101.5K sh · $2.86

Own +3%
Grant·A
Dec 11, 25

Kolchinsky Peter

Director,TenPercentOwner

—

20.4M sh

Own New
Other·D
Dec 11, 25

Kolchinsky Peter

Director,TenPercentOwner

$0

20.4M sh

Own -87%
Buy·P
Dec 11, 25

Kolchinsky Peter

Director,TenPercentOwner

$464.6K

213.1K sh · $2.18

Own +7%
Grant·A
Oct 1, 25

ALTSCHULLER Susan KEY

Chief Financial Officer

$0

600.0K sh

Own New
Grant·A
Aug 7, 25

Thomas Stephen Basil

Director

$0

100.4K sh

Own +49%
Sell·S
Jun 30, 25

Brennan Aoife KEY

President and CEO · 10b5-1

$25.2K

20.6K sh · $1.22

Own -30%
Exercise·M
Jun 27, 25

Thomas Stephen Basil

Director

$0

25.1K sh

Own New
Exercise·M
Jun 27, 25

Thomas Stephen Basil

Director

—

25.1K sh

Own +14%
Exercise·M
Jun 27, 25

Brennan Aoife KEY

President and CEO · 10b5-1

$0

68.8K sh

Own +50%
Exercise·M
Jun 27, 25

Brennan Aoife KEY

President and CEO · 10b5-1

—

68.8K sh

Own New

Date▾	Insider	Role	Type	Shares	Own Δ	Price	Value
Jun 5, 2026	RA CAPITAL MANAGEMENT, L.P.	Director, 10% Owner	Grant A	40.0K	New	—	$0
Jun 5, 2026	Levin Andrew David	Director	Grant A	40.0K	New	—	$0
Jun 5, 2026	Drapkin Kimberlee C	Director	Grant A	40.0K	New	—	$0
Jun 5, 2026	WILLIAMS DOUGLAS E	Director	Grant A	40.0K	New	—	$0
Jun 5, 2026	Cumbo Alexander	Director	Grant A	40.0K	New	—	$0
Jun 5, 2026	Thomas Stephen Basil	Director	Grant A	40.0K	New	—	$0
Jun 5, 2026	Dunn Judith	Director	Grant A	40.0K	New	—	$0
Apr 29, 2026	RA CAPITAL MANAGEMENT, L.P.	Director, 10% Owner	Grant A	2.1M	+10%	$9.50	$20.0M
Feb 26, 2026	Thomas Stephen Basil 10b5-1	Director	Sell S	16.3K	-10%	$7.01	$114.4K
Feb 25, 2026	Thomas Stephen Basil 10b5-1	Director	Sell S	33.7K	-16%	$7.00	$235.8K
Feb 13, 2026	Thomas Stephen Basil 10b5-1	Director	Sell S	10.0K	-5%	$5.81	$58.1K
Feb 12, 2026	Thomas Stephen Basil 10b5-1	Director	Sell S	90.0K	-30%	$5.23	$470.7K
Jan 6, 2026	Driscoll Cindy KEY	Senior Vice President, Finance	Grant A	100.0K	New	—	$0
Jan 6, 2026	Brennan Aoife KEY	President and CEO	Grant A	700.0K	New	—	$0
Jan 6, 2026	Wilson Perrin Megan	Chief Business Officer	Grant A	300.0K	New	—	$0
Jan 6, 2026	ALTSCHULLER Susan KEY	Chief Financial Officer	Grant A	142.5K	New	—	$0
Jan 5, 2026	RA Capital Healthcare Fund LP	Director,TenPercentOwner	Buy P	7.1K	+0%	$3.50	$24.9K
Dec 12, 2025	Kolchinsky Peter	Director,TenPercentOwner	Buy P	101.5K	+3%	$2.86	$290.2K
Dec 11, 2025	Kolchinsky Peter	Director,TenPercentOwner	Grant A	20.4M	New	—	—
Dec 11, 2025	Kolchinsky Peter	Director,TenPercentOwner	Other D	20.4M	-87%	—	$0
Dec 11, 2025	Kolchinsky Peter	Director,TenPercentOwner	Buy P	213.1K	+7%	$2.18	$464.6K
Oct 1, 2025	ALTSCHULLER Susan KEY	Chief Financial Officer	Grant A	600.0K	New	—	$0
Aug 7, 2025	Thomas Stephen Basil	Director	Grant A	100.4K	+49%	—	$0
Jun 30, 2025	Brennan Aoife KEY 10b5-1	President and CEO	Sell S	20.6K	-30%	$1.22	$25.2K
Jun 27, 2025	Thomas Stephen Basil	Director	Exercise M	25.1K	New	—	$0
Jun 27, 2025	Thomas Stephen Basil	Director	Exercise M	25.1K	+14%	—	—
Jun 27, 2025	Brennan Aoife KEY 10b5-1	President and CEO	Exercise M	68.8K	+50%	—	$0
Jun 27, 2025	Brennan Aoife KEY 10b5-1	President and CEO	Exercise M	68.8K	New	—	—

About CLYM insider trading

This page tracks insider transactions for Climb Bio, Inc. (CLYM) reported to the U.S. Securities and Exchange Commission on Form 4. Corporate insiders — directors, executive officers and beneficial owners of more than 10% of the stock — must disclose their trades within two business days. Open-market purchases (code P) and sales (code S) made at the insider's discretion are the most-watched opportunistic signals, while awards (A), option exercises (M) and tax-withholding (F) reflect compensation rather than conviction. Trades marked 10b5-1 were made under a pre-arranged plan and are considered routine. A cluster buy — several insiders buying within a short window — is historically a stronger bullish indicator than any single trade.