Sionna Therapeutics Ownership | Who Owns Sionna Therapeutics?

Sionna Therapeutics Ownership Summary

Sionna Therapeutics is owned by 15.12% institutional investors, 7.20% insiders, and 77.68% retail investors. Ra capital management is the largest institutional shareholder, holding 23.68% of SION shares.

SION Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Sionna Therapeutics	15.12%	7.20%	77.68%
Sector	Healthcare Stocks	42.53%	10.81%	46.67%
Industry	Biotech Stocks	45.24%	10.75%	44.01%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Ra capital management	10.45M	23.68%	$307.20M
Tpg gp a	6.74M	15.29%	$198.37M
Orbimed advisors	3.70M	8.40%	$108.96M
Atlas venture life science advisors	3.62M	8.20%	$106.33M
Viking global investors lp	3.20M	7.24%	$93.97M
Enavate sciences gp	2.48M	5.62%	$72.88M
Jpmorgan chase	1.98M	4.49%	$58.19M
Perceptive advisors	1.18M	2.67%	$34.68M
Vanguard group	1.14M	2.59%	$33.62M
Jennison associates	997.38K	2.26%	$29.33M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Enavate sciences gp	2.48M	22.25%	$72.88M
Atlas venture life science advisors	3.62M	14.13%	$106.33M
Tpg gp a	6.74M	10.80%	$198.37M
Ra capital management	10.45M	3.79%	$307.20M
Orbimed advisors	3.70M	2.57%	$108.96M
Perceptive advisors	1.18M	1.00%	$34.68M
Soleus capital management	413.50K	0.61%	$12.16M
Deerfield management company, l.p. (series c)	970.59K	0.44%	$28.55M
Silverarc capital management	108.80K	0.43%	$3.20M
Siren	325.00K	0.37%	$9.56M

Top Buyers

Holder	Shares	% Assets	Change
Vanguard group	1.14M	0.00%	512.80K
Jennison associates	997.38K	0.02%	244.57K
Blackrock funding, inc. /de	844.61K	0.00%	207.50K
State street	240.20K	0.00%	115.68K
Longaeva partners	61.46K	0.26%	61.46K

Top Sellers

Holder	Shares	% Assets	Change
Braidwell lp	314.01K	0.27%	-767.84K
Franklin resources	242.15K	0.00%	-257.88K
Jpmorgan chase	1.98M	0.00%	-242.56K
Zimmer partners, lp	-	-	-237.50K
Price t rowe associates inc /md/	637.76K	0.00%	-223.48K

New Positions

Holder	Shares	% Assets	Change	Value
Longaeva partners	61.46K	0.26%	61.46K	$1.81M
Wellington management group llp	42.23K	0.00%	42.23K	$1.24M
Jain global	8.51K	0.00%	8.51K	$250.37K
Intech investment management	7.49K	0.00%	7.49K	$220.16K
China universal asset management	5.00K	0.01%	5.00K	$147.05K

Sold Out

Holder	Change
Strs ohio	-2.30K
Two sigma investments, lp	-11.71K
Balyasny asset management	-13.06K
Commonwealth equity services	-14.02K
Options solutions	-16.98K

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Sep 30, 2025	29	-55.38%	6,672,182	-84.64%	15	0.16%	18	-59.09%	6	-40.00%
Jun 30, 2025	65	38.30%	43,448,395	4.72%	98	0.40%	44	-6.38%	10	-
Mar 31, 2025	47	-	41,491,947	-	156	-	47	-	-	-

Recent Insider Transactions

Date	Name	Role	Activity	Value
Nov 26, 2025	ORBIMED ADVISORS LLC	-	Sell	$71.18K
Nov 25, 2025	ORBIMED ADVISORS LLC	-	Sell	$530.29K
Nov 24, 2025	ORBIMED ADVISORS LLC	-	Sell	$4.21M
Nov 24, 2025	Thompson Peter A.	-	Sell	$4.21M
Nov 25, 2025	Thompson Peter A.	-	Sell	$530.29K

Insider Transactions Trends

Date	Buy	Sell
2025 Q4	-	103
2025 Q3	-	17
2025 Q2	1	-

SION Ownership FAQ

Who Owns Sionna Therapeutics?

Sionna Therapeutics shareholders are primarily institutional investors at 15.12%, followed by 7.20% insiders and 77.68% retail investors. The average institutional ownership in Sionna Therapeutics's industry, Biotech Stocks , is 45.24%, which Sionna Therapeutics falls below.

Who owns the most shares of Sionna Therapeutics?

Sionna Therapeutics’s largest shareholders are Ra capital management (10.45M shares, 23.68%), Tpg gp a (6.74M shares, 15.29%), and Orbimed advisors (3.7M shares, 8.40%). Together, they hold 47.36% of Sionna Therapeutics’s total shares outstanding.

Does Blackrock own Sionna Therapeutics?

BlackRock is not among the top 10 institutional shareholders of Sionna Therapeutics.

Who is Sionna Therapeutics’s biggest shareholder by percentage of total assets invested?

Enavate sciences gp is Sionna Therapeutics’s biggest shareholder by percentage of total assets invested, with 22.25% of its assets in 2.48M Sionna Therapeutics shares, valued at 72.88M$.

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