SION Sionna Therapeutics, Inc.

NASDAQ
$8.26

Sionna Therapeutics, Inc. (SION) Institutional Ownership

What the institutions did with SION last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.

Managers compared
154
filed both this quarter and last
Managers holding
145
+24 on the quarter
Buyers
90
33 opened new
Sellers
49
9 sold out entirely
Buyer share
64.8%
of managers who traded it
Breadth
+29.5
net buyers, as a share of those trading

Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.

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Ownership map

Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.

Cut Unchanged Added Color saturates at ±50%.

Largest holders

Manager Shares % of reported
RA CAPITAL MANAGEMENT, L.P. 9.9M 20.5%
TPG GP A, LLC 6.5M 13.5%
VIKING GLOBAL INVESTORS LP 3.2M 6.6%
Atlas Venture Life Science Advisors, LLC 3.0M 6.2%
ORBIMED ADVISORS LLC 2.6M 5.3%
ENAVATE SCIENCES GP, LLC 2.5M 5.1%
ADAGE CAPITAL PARTNERS GP, L.L.C. 1.6M 3.3%
JPMORGAN CHASE & CO 1.5M 3.1%
BlackRock, Inc. 1.5M 3.1%
JENNISON ASSOCIATES LLC 1.2M 2.4%
CITADEL ADVISORS LLC 1.1M 2.4%
VANGUARD CAPITAL MANAGEMENT LLC 1.1M 2.3%
STATE STREET CORP 1.0M 2.1%
PERCEPTIVE ADVISORS LLC 905.0K 1.9%
DEERFIELD MANAGEMENT COMPANY, L.P. 680.9K 1.4%
Siren, L.L.C. 610.5K 1.3%
PRICE T ROWE ASSOCIATES INC /MD/ 478.0K 1.0%
EVENTIDE ASSET MANAGEMENT, LLC 475.0K 1.0%
GEODE CAPITAL MANAGEMENT, LLC 457.1K 0.9%
BAKER BROS. ADVISORS LP 400.0K 0.8%
Casdin Capital, LLC 400.0K 0.8%
Kalehua Capital Management LLC 394.1K 0.8%
GOLDMAN SACHS GROUP INC 388.8K 0.8%
Driehaus Capital Management LLC 385.4K 0.8%
FRANKLIN RESOURCES INC 290.1K 0.6%

Largest changes

Manager Action Previous Current Change
ADAGE CAPITAL PARTNERS GP, L.L.C. Increased 150.0K 1.6M +1.5M
ORBIMED ADVISORS LLC Reduced 3.5M 2.6M -974.8K
Casdin Capital, LLC New 0 400.0K +400.0K
Siren, L.L.C. Increased 300.0K 610.5K +310.5K
Driehaus Capital Management LLC Increased 76.6K 385.4K +308.8K
DEERFIELD MANAGEMENT COMPANY, L.P. Reduced 970.6K 680.9K -289.7K
Aberdeen Group plc Reduced 564.2K 284.1K -280.0K
JENNISON ASSOCIATES LLC Reduced 1.5M 1.2M -279.1K
PRICE T ROWE ASSOCIATES INC /MD/ Reduced 756.4K 478.0K -278.4K
STATE STREET CORP Increased 756.2K 1.0M +265.3K
PERCEPTIVE ADVISORS LLC Increased 658.4K 905.0K +246.6K
FMR LLC Increased 81.4K 278.3K +196.9K
Artisan Partners Limited Partnership New 0 189.5K +189.5K
Longaeva Partners L.P. Increased 12.7K 196.4K +183.7K
BlackRock, Inc. Increased 1.3M 1.5M +178.9K
EVENTIDE ASSET MANAGEMENT, LLC Reduced 645.5K 475.0K -170.5K
Sio Capital Management, LLC Reduced 294.3K 127.8K -166.5K
Sofinnova Investments, Inc. New 0 144.4K +144.4K
MILLENNIUM MANAGEMENT LLC Increased 140.6K 276.7K +136.1K
GOLDMAN SACHS GROUP INC Increased 263.2K 388.8K +125.6K
Soleus Capital Management, L.P. Reduced 293.5K 177.7K -115.8K
FRANKLIN RESOURCES INC Increased 175.5K 290.1K +114.6K
First Turn Management, LLC New 0 110.5K +110.5K
VANGUARD CAPITAL MANAGEMENT LLC Increased 1.0M 1.1M +102.5K
D. E. Shaw & Co., Inc. New 0 101.6K +101.6K
Qube Research & Technologies Ltd Increased 42.2K 140.3K +98.1K
CITIGROUP INC Increased 18.1K 110.2K +92.1K
Point72 Asset Management, L.P. Reduced 136.5K 49.3K -87.2K
Walleye Capital LLC Increased 15.1K 97.3K +82.3K
VANGUARD PORTFOLIO MANAGEMENT LLC Increased 142.1K 222.9K +80.9K
SUPERSTRING CAPITAL MANAGEMENT LP Reduced 141.0K 63.2K -77.9K
Ishara Investments LP Increased 49.2K 123.0K +73.8K
Ensign Peak Advisors, Inc Reduced 255.6K 184.5K -71.1K
GEODE CAPITAL MANAGEMENT, LLC Increased 389.9K 457.1K +67.3K
DEUTSCHE BANK AG\ Increased 13.2K 53.4K +40.1K
BANK OF AMERICA CORP /DE/ Increased 50.9K 88.9K +38.0K
NORTHERN TRUST CORP Increased 116.8K 154.5K +37.7K
MUTUAL OF AMERICA CAPITAL MANAGEMENT LLC New 0 36.0K +36.0K
TD Asset Management Inc Reduced 83.0K 47.4K -35.6K
UBS Group AG Reduced 147.6K 116.2K -31.4K
MANUFACTURERS LIFE INSURANCE COMPANY, THE Reduced 64.5K 35.4K -29.0K
Swiss National Bank New 0 27.0K +27.0K
POLEN CAPITAL MANAGEMENT LLC Sold Out 26.8K 0 -26.8K
Quadrature Capital Ltd New 0 26.0K +26.0K
JPMORGAN CHASE & CO Increased 1.5M 1.5M +25.5K
Integral Health Asset Management, LLC Increased 50.0K 75.0K +25.0K
Trexquant Investment LP New 0 23.8K +23.8K
TUDOR INVESTMENT CORP ET AL New 0 22.6K +22.6K
CITADEL ADVISORS LLC Reduced 1.2M 1.1M -19.3K
NEW YORK STATE COMMON RETIREMENT FUND Increased 5.3K 23.6K +18.3K
Susquehanna Portfolio Strategies, LLC New 0 18.0K +18.0K
MORGAN STANLEY Increased 133.0K 151.0K +18.0K
Shay Capital LLC New 0 18.0K +18.0K
Nuveen, LLC Increased 23.7K 41.3K +17.5K
Engineers Gate Manager LP New 0 15.6K +15.6K
XTX Topco Ltd Increased 23.6K 38.1K +14.5K
LOS ANGELES CAPITAL MANAGEMENT LLC Increased 4.1K 18.6K +14.5K
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Increased 868 14.9K +14.0K
STEMPOINT CAPITAL LP Reduced 73.1K 59.4K -13.7K
MARSHALL WACE, LLP New 0 12.6K +12.6K

13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.