SION

insider transactions

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

30D 90D 1Y

Net shares · 365d

-997.5K

0 buy · 997.5K sell

Net value · 365d

-$49.3M

$0 in · $49.3M out

Sentiment · 365d

Net selling

0% buying · 100% selling

Open-market trades · 365d

0 buy · 997.5K 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 17, 26

Joanne L. Viney

Director

$0

17.3K sh

Own New
Grant·A
Jun 17, 26

Laurie Stelzer

Director

$0

17.3K sh

Own New
Grant·A
Jun 17, 26

Peter A. Thompson

Director

$0

17.3K sh

Own New
Grant·A
Jun 17, 26

Joshua Resnick

Director

$0

17.3K sh

Own New
Grant·A
Jun 17, 26

Bruce Booth

Director

$0

17.3K sh

Own New
Sell·S
May 27, 26

Peter A. Thompson

Director · 10b5-1

$4.5K

101 sh · $44.49

Own -0%
Sell·S
May 11, 26

Peter A. Thompson

Director · 10b5-1

$8.5M

184.6K sh · $46.22

Own -6%
Sell·S
May 8, 26

Peter A. Thompson

Director · 10b5-1

$2.7M

59.8K sh · $44.58

Own -2%
Sell·S
May 7, 26

Peter A. Thompson

Director · 10b5-1

$2.2M

48.5K sh · $44.61

Own -2%
Exercise·M
Apr 22, 26

Bruce Booth

Director · 10b5-1

$0

259 sh

Own +1%
Exercise·M
Apr 22, 26

Bruce Booth

Director · 10b5-1

$0

5.6K sh

Own New
Sell·S
Apr 22, 26

Bruce Booth

Director · 10b5-1

$1.1K

12 sh · $90.08

Own -0%
Sell·S
Apr 22, 26

Bruce Booth

Director · 10b5-1

$7.9K

88 sh · $90.08

Own -0%
Sell·S
Apr 22, 26

Bruce Booth

Director · 10b5-1

$530.8K

5.9K sh · $89.96

Own -100%
Exercise·M
Apr 22, 26

Bruce Booth

Director · 10b5-1

$5.2K

259 sh · $20.00

Own +5%
Exercise·M
Apr 22, 26

Bruce Booth

Director · 10b5-1

$80.0K

5.6K sh · $14.18

Own New
Sell·S
Apr 18, 26

Peter A. Thompson

Director · 10b5-1

$131.2K

2.9K sh · $44.52

Own -0%
Sell·S
Apr 17, 26

Peter A. Thompson

Director · 10b5-1

$2.3M

52.4K sh · $44.68

Own -2%
Sell·S
Apr 16, 26

Peter A. Thompson

Director · 10b5-1

$10.3M

226.9K sh · $45.34

Own -7%
Sell·S
Apr 15, 26

Peter A. Thompson

Director · 10b5-1

$10.5M

235.9K sh · $44.64

Own -7%
Exercise·M
Apr 15, 26

Bruce Booth

Director · 10b5-1

$0

2.2K sh

Own +64%
Sell·S
Apr 15, 26

Bruce Booth

Director · 10b5-1

$34.7K

385 sh · $90.10

Own -0%
Sell·S
Apr 15, 26

Bruce Booth

Director · 10b5-1

$247.8K

2.8K sh · $90.10

Own -0%
Sell·S
Apr 15, 26

Bruce Booth

Director · 10b5-1

$197.9K

2.2K sh · $89.95

Own -100%
Exercise·M
Apr 15, 26

Bruce Booth

Director · 10b5-1

$31.2K

2.2K sh · $14.18

Own New
Sell·S
Apr 14, 26

Peter A. Thompson

Director · 10b5-1

$2.1M

47.8K sh · $44.51

Own -1%
Exercise·M
Apr 14, 26

Bruce Booth

Director · 10b5-1

$0

4.2K sh

Own +113%
Sell·S
Apr 14, 26

Bruce Booth

Director · 10b5-1

$374.2K

4.2K sh · $89.97

Own -100%
Exercise·M
Apr 14, 26

Bruce Booth

Director · 10b5-1

$59.0K

4.2K sh · $14.18

Own New
Exercise·M
Mar 5, 26

Jennifer Fitzpatrick

Chief Legal Officer · 10b5-1

$0

10.2K sh

Own +25%
Sell·S
Mar 5, 26

Jennifer Fitzpatrick

Chief Legal Officer · 10b5-1

$347.0K

10.2K sh · $33.86

Own -100%
Exercise·M
Mar 5, 26

Jennifer Fitzpatrick

Chief Legal Officer · 10b5-1

$62.6K

10.2K sh · $6.11

Own New
Sell·S
Mar 2, 26

Bruce Booth

Director · 10b5-1

$906.0K

10.1K sh · $90.13

Own -1%
Sell·S
Mar 2, 26

Bruce Booth

Director · 10b5-1

$6.5M

71.8K sh · $90.13

Own -2%
Sell·S
Feb 3, 26

Peter A. Thompson

Director · 10b5-1

$1.3M

29.1K sh · $44.58

Own -1%
Sell·S
Feb 2, 26

Peter A. Thompson

Director · 10b5-1

$84.2K

1.9K sh · $44.57

Own -0%
Grant·A
Jan 2, 26

Elena Ridloff KEY

CFO

$0

165.4K sh

Own New
Grant·A
Jan 2, 26

Charlotte Mckee

Chief Medical Officer

$0

155.7K sh

Own New
Grant·A
Jan 2, 26

Jennifer Fitzpatrick

Chief Legal Officer

$0

103.1K sh

Own New
Grant·A
Jan 2, 26

Michael Cloonan KEY

President & CEO

$0

436.1K sh

Own New
Grant·A
Jan 2, 26

Caroline Stark Beer

Chief Business Officer

$0

139.3K sh

Own New

Date▾	Insider	Role	Type	Shares	Own Δ	Price	Value
Jun 17, 2026	Joanne L. Viney	Director	Grant A	17.3K	New	—	$0
Jun 17, 2026	Laurie Stelzer	Director	Grant A	17.3K	New	—	$0
Jun 17, 2026	Peter A. Thompson	Director	Grant A	17.3K	New	—	$0
Jun 17, 2026	Joshua Resnick	Director	Grant A	17.3K	New	—	$0
Jun 17, 2026	Bruce Booth	Director	Grant A	17.3K	New	—	$0
May 27, 2026	Peter A. Thompson 10b5-1	Director	Sell S	101	-0%	$44.49	$4.5K
May 11, 2026	Peter A. Thompson 10b5-1	Director	Sell S	184.6K	-6%	$46.22	$8.5M
May 8, 2026	Peter A. Thompson 10b5-1	Director	Sell S	59.8K	-2%	$44.58	$2.7M
May 7, 2026	Peter A. Thompson 10b5-1	Director	Sell S	48.5K	-2%	$44.61	$2.2M
Apr 22, 2026	Bruce Booth 10b5-1	Director	Exercise M	259	+1%	—	$0
Apr 22, 2026	Bruce Booth 10b5-1	Director	Exercise M	5.6K	New	—	$0
Apr 22, 2026	Bruce Booth 10b5-1	Director	Sell S	12	-0%	$90.08	$1.1K
Apr 22, 2026	Bruce Booth 10b5-1	Director	Sell S	88	-0%	$90.08	$7.9K
Apr 22, 2026	Bruce Booth 10b5-1	Director	Sell S	5.9K	-100%	$89.96	$530.8K
Apr 22, 2026	Bruce Booth 10b5-1	Director	Exercise M	259	+5%	$20.00	$5.2K
Apr 22, 2026	Bruce Booth 10b5-1	Director	Exercise M	5.6K	New	$14.18	$80.0K
Apr 18, 2026	Peter A. Thompson 10b5-1	Director	Sell S	2.9K	-0%	$44.52	$131.2K
Apr 17, 2026	Peter A. Thompson 10b5-1	Director	Sell S	52.4K	-2%	$44.68	$2.3M
Apr 16, 2026	Peter A. Thompson 10b5-1	Director	Sell S	226.9K	-7%	$45.34	$10.3M
Apr 15, 2026	Peter A. Thompson 10b5-1	Director	Sell S	235.9K	-7%	$44.64	$10.5M
Apr 15, 2026	Bruce Booth 10b5-1	Director	Exercise M	2.2K	+64%	—	$0
Apr 15, 2026	Bruce Booth 10b5-1	Director	Sell S	385	-0%	$90.10	$34.7K
Apr 15, 2026	Bruce Booth 10b5-1	Director	Sell S	2.8K	-0%	$90.10	$247.8K
Apr 15, 2026	Bruce Booth 10b5-1	Director	Sell S	2.2K	-100%	$89.95	$197.9K
Apr 15, 2026	Bruce Booth 10b5-1	Director	Exercise M	2.2K	New	$14.18	$31.2K
Apr 14, 2026	Peter A. Thompson 10b5-1	Director	Sell S	47.8K	-1%	$44.51	$2.1M
Apr 14, 2026	Bruce Booth 10b5-1	Director	Exercise M	4.2K	+113%	—	$0
Apr 14, 2026	Bruce Booth 10b5-1	Director	Sell S	4.2K	-100%	$89.97	$374.2K
Apr 14, 2026	Bruce Booth 10b5-1	Director	Exercise M	4.2K	New	$14.18	$59.0K
Mar 5, 2026	Jennifer Fitzpatrick 10b5-1	Chief Legal Officer	Exercise M	10.2K	+25%	—	$0
Mar 5, 2026	Jennifer Fitzpatrick 10b5-1	Chief Legal Officer	Sell S	10.2K	-100%	$33.86	$347.0K
Mar 5, 2026	Jennifer Fitzpatrick 10b5-1	Chief Legal Officer	Exercise M	10.2K	New	$6.11	$62.6K
Mar 2, 2026	Bruce Booth 10b5-1	Director	Sell S	10.1K	-1%	$90.13	$906.0K
Mar 2, 2026	Bruce Booth 10b5-1	Director	Sell S	71.8K	-2%	$90.13	$6.5M
Feb 3, 2026	Peter A. Thompson 10b5-1	Director	Sell S	29.1K	-1%	$44.58	$1.3M
Feb 2, 2026	Peter A. Thompson 10b5-1	Director	Sell S	1.9K	-0%	$44.57	$84.2K
Jan 2, 2026	Elena Ridloff KEY	CFO	Grant A	165.4K	New	—	$0
Jan 2, 2026	Charlotte Mckee	Chief Medical Officer	Grant A	155.7K	New	—	$0
Jan 2, 2026	Jennifer Fitzpatrick	Chief Legal Officer	Grant A	103.1K	New	—	$0
Jan 2, 2026	Michael Cloonan KEY	President & CEO	Grant A	436.1K	New	—	$0
Jan 2, 2026	Caroline Stark Beer	Chief Business Officer	Grant A	139.3K	New	—	$0

About SION insider trading

This page tracks insider transactions for Sionna Therapeutics, Inc. (SION) 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.