Sionna Therapeutics Ownership | Who Owns Sionna Therapeutics?

Sionna Therapeutics Ownership Summary

Sionna Therapeutics is owned by 113.50% institutional investors, 6.85% insiders. Ra capital management is the largest institutional shareholder, holding 24.79% of SION shares. Vanguard Total Stock Mkt Idx Inv is the top mutual fund, with 1.87% of its assets in Sionna Therapeutics shares.

SION Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Sionna Therapeutics	113.50%	6.85%	-20.35%
Sector	Healthcare Stocks	35.58%	11.87%	52.55%
Industry	Biotech Stocks	35.75%	11.83%	52.41%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Ra capital management	9.91M	24.79%	$397.09M
Tpg gp a	6.49M	16.25%	$260.38M
Orbimed advisors	3.53M	8.84%	$141.55M
Viking global investors lp	3.20M	8.00%	$128.09M
Atlas venture life science advisors	3.00M	7.50%	$120.09M
Enavate sciences gp	2.48M	6.20%	$99.34M
Jpmorgan chase	1.47M	3.67%	$53.71M
Jennison associates	1.45M	3.63%	$58.18M
Blackrock funding, inc. /de	1.30M	3.24%	$51.95M
Citadel advisors	1.17M	2.92%	$46.78M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Enavate sciences gp	2.48M	28.26%	$99.34M
Atlas venture life science advisors	3.00M	15.20%	$120.09M
Tpg gp a	6.49M	7.08%	$260.38M
Ra capital management	9.91M	4.21%	$397.09M
Superstring capital management lp	141.02K	4.04%	$5.65M
Orbimed advisors	3.53M	2.82%	$141.55M
Sio capital management	294.34K	1.69%	$11.80M
Artia global partners lp	119.74K	1.06%	$4.80M
Perceptive advisors	658.44K	0.52%	$26.40M
Soleus capital management	293.50K	0.48%	$11.77M

Top Buyers

Holder	Shares	% Assets	Change
Jennison associates	1.45M	0.04%	335.94K
Sio capital management	294.34K	1.69%	294.34K
Candriam s.c.a.	236.81K	0.05%	236.81K
Jpmorgan chase	1.47M	0.00%	233.19K
Goldman sachs group	263.17K	0.00%	226.91K

Top Sellers

Holder	Shares	% Assets	Change
Braidwell lp	314.01K	0.27%	-767.84K
Perceptive advisors	658.44K	0.52%	-520.66K
Abrdn	564.17K	0.04%	-275.79K
Tpg gp a	6.49M	7.08%	-250.00K
Zimmer partners, lp	-	-	-237.50K

New Positions

Holder	Shares	% Assets	Change	Value
Sio capital management	294.34K	1.69%	294.34K	$11.80M
Candriam s.c.a.	236.81K	0.05%	236.81K	$9.49M
Adage capital partners gp	150.00K	0.01%	150.00K	$6.01M
Point72 asset management	136.55K	0.01%	136.55K	$5.47M
Vanguard fiduciary trust	112.17K	0.00%	112.17K	$4.50M

Sold Out

Holder	Change
Aster capital management (difc)	-37.00
Srs capital advisors	-92.00
Federated hermes	-113.00
Daiwa securities group	-149.00
Amalgamated bank	-504.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Mar 31, 2026	119	17.82%	45,355,594	3.20%	113	1.16%	70	1.45%	29	45.00%
Dec 31, 2025	40	-48.72%	6,711,927	-84.33%	15	0.16%	29	-25.64%	7	-63.16%
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	-	-	-

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard Total Stock Mkt Idx Inv	842.94K	1.87%	-
PGIM Jennison Health Sciences Z	651.05K	1.44%	-
Jennison Health Sciences Equity	651.05K	1.44%	97.11K
Eventide Healthcare & Life Sciences I	639.04K	1.42%	639.04K
T. Rowe Price Health Sciences	574.04K	1.27%	620.00
JPMorgan Small Cap Growth A	551.83K	1.22%	-10.05K
State Street® SPDR® S&P® Biotech ETF	453.22K	1.00%	-3.29K
iShares Russell 2000 ETF	384.21K	0.85%	3.24K
JPM Global Healthcare C acc USD	359.37K	0.80%	-14.50K
abrdn Healthcare Investors	233.64K	0.52%	-162.49K

Recent Insider Transactions

Date	Name	Role	Activity	Value
May 11, 2026	Thompson Peter A.	-	Sell	$8.53M
May 08, 2026	Thompson Peter A.	-	Sell	$2.66M
May 07, 2026	Thompson Peter A.	-	Sell	$2.17M
May 07, 2026	ORBIMED ADVISORS LLC	-	Sell	$2.17M
May 08, 2026	ORBIMED ADVISORS LLC	-	Sell	$2.66M

Insider Transactions Trends

Date	Buy	Sell
2026 Q2	-	16
2026 Q1	-	6
2025 Q4	-	112
2025 Q3	-	17
2025 Q2	1	-

SION Ownership FAQ

Who Owns Sionna Therapeutics?

Sionna Therapeutics shareholders are primarily institutional investors at 113.50%, followed by 6.85% insiders and -20.35% retail investors. The average institutional ownership in Sionna Therapeutics's industry, Biotech Stocks , is 35.75%, which Sionna Therapeutics exceeds.

Who owns the most shares of Sionna Therapeutics?

Sionna Therapeutics’s largest shareholders are Ra capital management (9.91M shares, 24.79%), Tpg gp a (6.49M shares, 16.25%), and Orbimed advisors (3.53M shares, 8.84%). Together, they hold 49.87% 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 28.26% of its assets in 2.48M Sionna Therapeutics shares, valued at 99.34M$.

Who is the top mutual fund holder of Sionna Therapeutics shares?

Vanguard Total Stock Mkt Idx Inv is the top mutual fund holder of Sionna Therapeutics shares, with 1.87% of its total shares outstanding invested in 842.94K Sionna Therapeutics shares.

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