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Sionna Therapeutics (SION) Institutional Ownership

Sionna Therapeutics logo
$4.59 -46.45 (-91.01%)
As of 03:57 PM Eastern
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Institutional Ownership Changes (13F Filings) for Sionna Therapeutics (NASDAQ:SION)

Number of
Institutional Buyers
(last 12 months)
64
Total
Institutional Inflows
(last 12 months)
$259.02M
Number of
Institutional Sellers
(last 12 months)
22
Total
Institutional Outflows
(last 12 months)
$175.62M
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SION Institutional Buying and Selling by Quarter

Sionna Therapeutics Major Shareholders & Ownership History

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Reporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
8/7/2026 BlackRock Inc.1,474,769$64.88M0.0%N/A3.266%
8/7/2026 Deutsche Bank AG53,353$2.35M0.0%N/A0.118%
8/7/2026 Mitsubishi UFJ Asset Management Co. Ltd.1,000$44K0.0%N/A0.002%
8/6/2026 Bank of New York Mellon Corp41,586$1.83M0.0%N/A0.092%
8/6/2026 State of Wyoming804$35K0.0%N/A0.002%
8/3/2026 Walleye Capital LLC97,347$4.28M0.0%N/A0.216%
5/29/2026Perceptive Advisors LLC658,439$26.40M0.5%-44.2%1.458%
5/19/2026Bank of America Corp DE50,870$2.04M0.0%+16.8%0.113%
5/19/2026Stempoint Capital LP36,540$1.47M0.3%N/A0.081%
5/16/2026The Manufacturers Life Insurance Company64,458$2.58M0.0%-7.2%0.143%
5/16/2026Orbimed Advisors LLC3,530,702$141.55M2.6%-0.9%7.820%
5/14/2026 Walleye Capital LLC15,097$605K0.0%N/A0.033%
5/7/2026 AlphaCentric Advisors LLC4,818$193K0.2%+77.1%0.011%
5/6/2026 Jennison Associates LLC1,451,220$58.18M0.0%+30.1%3.215%
5/5/2026 Bank of New York Mellon Corp33,778$1.35M0.0%-3.9%0.075%
5/1/2026Candriam S.C.A.236,813$9.49M0.0%N/A0.525%
4/25/2026 Strs Ohio2,900$116K0.0%N/A0.006%
2/19/2026Invesco Ltd.111,162$4.57M0.0%N/A0.249%
2/18/2026XTX Topco Ltd4,926$203K0.0%N/A0.011%
2/18/2026Virtus Investment Advisers LLC6,220$256K0.1%-7.1%0.014%
2/18/2026Wellington Management Group LLP38,347$1.58M0.0%-9.2%0.086%
2/18/2026Superstring Capital Management LP180,593$7.43M4.0%N/A0.405%
2/18/2026Orbimed Advisors LLC3,561,655$146.53M3.1%-3.9%7.981%
2/18/2026Millennium Management LLC80,546$3.31M0.0%-62.4%0.180%
2/18/2026Artia Global Partners LP119,741$4.93M0.7%N/A0.268%
2/18/2026Balyasny Asset Management L.P.1,406$58K0.0%N/A0.003%
2/17/2026RA Capital Management L.P.9,905,045$407.49M4.2%-5.2%22.194%
2/17/2026Price T Rowe Associates Inc. MD831,373$34.20M0.0%+30.4%1.863%
2/17/2026 Russell Investments Group Ltd.21,941$903K0.0%+2,046.9%0.049%
2/16/2026Squarepoint Ops LLC16,360$673K0.0%+61.0%0.037%
2/16/2026Kennedy Capital Management LLC6,752$278K0.0%N/A0.015%
2/16/2026Eventide Asset Management LLC639,045$26.29M0.4%N/A1.432%
2/16/2026Barclays PLC48,172$1.98M0.0%+173.0%0.108%
2/13/2026The Manufacturers Life Insurance Company 69,424$2.87M0.0%+116.4%0.156%
2/13/2026Kalehua Capital Management LLC197,072$8.11M7.5%N/A0.442%
2/13/2026Rafferty Asset Management LLC24,690$1.02M0.0%N/A0.055%
2/13/2026Alyeska Investment Group L.P.136,222$5.60M0.0%-26.8%0.305%
2/13/2026Siren L.L.C.300,000$12.34M0.4%-7.7%0.672%
2/13/2026Charles Schwab Investment Management Inc.123,686$5.09M0.0%+10.9%0.277%
2/13/2026 Police & Firemen s Retirement System of New Jersey4,232$174K0.0%+30.9%0.009%
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2/13/2026 State Street Corp693,395$28.53M0.0%+188.7%1.554%
2/13/2026Wells Fargo & Company MN17,551$722K0.0%+131.7%0.039%
2/13/2026Atlas Venture Life Science Advisors LLC2,995,602$123.24M14.2%-17.1%6.712%
2/12/2026MetLife Investment Management LLC8,565$352K0.0%+6.6%0.019%
2/12/2026Ensign Peak Advisors Inc79,862$3.29M0.0%N/A0.179%
2/12/2026 AlphaCentric Advisors LLC2,720$112K0.1%N/A0.006%
2/12/2026CIBC Private Wealth Group LLC4,500$185K0.0%N/A0.010%
2/12/2026 Alps Advisors Inc.36,648$1.51M0.0%N/A0.082%
2/12/2026Nuveen LLC23,734$976K0.0%+48.0%0.053%
2/11/2026 Deutsche Bank AG10,029$413K0.0%+4.5%0.022%
2/11/2026Franklin Resources Inc.175,483$7.22M0.0%-27.5%0.393%
2/11/2026JPMorgan Chase & Co.1,231,819$50.68M0.0%-37.7%2.760%
2/11/2026Los Angeles Capital Management LLC5,189$197K0.0%N/A0.012%
2/10/2026 TD Asset Management Inc113,352$4.66M0.0%+30.2%0.254%
2/10/2026Goldman Sachs Group Inc.36,269$1.49M0.0%+197.8%0.081%
2/10/2026Seven Grand Managers LLC50,000$2.06M0.2%N/A0.112%
2/9/2026Geode Capital Management LLC380,042$15.64M0.0%+20.1%0.852%
2/6/2026ProShare Advisors LLC4,903$202K0.0%N/A0.011%
1/30/2026 Jennison Associates LLC1,115,278$45.88M0.0%+11.8%2.499%
1/29/2026UBS Group AG89,177$3.67M0.0%+91.1%0.200%
1/29/2026Vanguard Group Inc.1,184,951$48.75M0.0%+3.7%2.655%
1/29/2026 China Universal Asset Management Co. Ltd.10,272$423K0.0%+105.4%0.023%
1/27/2026 GF Fund Management CO. LTD.876$36K0.0%N/A0.002%
1/26/2026 Mirae Asset Global Investments Co. Ltd.2,169$89K0.0%N/A0.005%
1/16/2026 Aberdeen Group plc839,960$34.56M0.1%-11.6%1.882%
1/9/2026 SG Americas Securities LLC10,691$440K0.0%N/A0.024%
11/26/2025JPMorgan Chase & Co.1,978,626$58.19M0.0%-10.9%4.433%
11/17/2025Millennium Management LLC214,085$6.30M0.0%+1,425.5%0.480%
11/17/2025MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.5,643$166K0.0%-16.4%0.013%
11/17/2025Jain Global LLC8,513$250K0.0%N/A0.019%
11/17/2025Citadel Advisors LLC35,923$1.06M0.0%-72.3%0.080%
11/17/2025Bank of America Corp DE6,541$192K0.0%+8.8%0.015%
11/17/2025Braidwell LP314,013$9.24M0.3%-71.0%0.704%
11/17/2025Ameriprise Financial Inc.153,151$4.50M0.0%-35.3%0.343%
11/14/2025Longaeva Partners L.P.61,457$1.81M0.3%N/A0.138%
11/14/2025Squarepoint Ops LLC10,162$299K0.0%N/A0.023%
11/14/2025Atlas Venture Life Science Advisors LLC3,615,527$106.33M14.1%-2.1%8.101%
11/13/2025UBS Group AG46,666$1.37M0.0%-9.2%0.105%
11/13/2025BNP Paribas Financial Markets2,380$70K0.0%+35.2%0.005%
11/13/2025Franklin Resources Inc.242,147$7.12M0.0%-51.6%0.543%
11/13/2025Legal & General Group Plc7,374$217K0.0%+436.7%0.017%
11/13/2025 Russell Investments Group Ltd.1,022$30K0.0%N/A0.002%
11/12/2025Intech Investment Management LLC7,486$220K0.0%N/A0.017%
11/10/2025 TD Asset Management Inc87,082$2.56M0.0%+74.3%0.195%
11/10/2025 China Universal Asset Management Co. Ltd.5,000$147K0.0%N/A0.011%
11/7/2025Vanguard Group Inc.1,143,154$33.62M0.0%+81.4%2.590%
11/7/2025JPMorgan Chase & Co.1,978,626$58.19M0.0%-10.9%4.483%
11/6/2025Rhumbline Advisers17,240$507K0.0%-2.4%0.039%
11/3/2025 New York State Common Retirement Fund5,300$156K0.0%-22.1%0.012%
8/15/2025Soleus Capital Management L.P.376,000$6.52M0.4%+56.7%0.852%
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8/15/2025Perceptive Advisors LLC1,216,045$21.10M1.9%-2.8%2.755%
8/15/2025BNP Paribas Financial Markets1,761$31K0.0%N/A0.004%
8/15/2025Braidwell LP1,081,855$18.77M0.6%N/A2.451%
8/15/2025Bank of America Corp DE6,012$104K0.0%-31.2%0.014%
8/15/2025Ameriprise Financial Inc.236,813$4.11M0.0%+13.2%0.537%
8/14/2025Viking Global Investors LP3,195,181$55.44M0.2%+8.2%7.239%
8/14/2025MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.6,747$117K0.0%N/A0.015%
8/14/2025The Manufacturers Life Insurance Company 38,038$660K0.0%+13.4%0.086%
8/13/2025Bosun Asset Management LLC16,975$295K0.1%N/A0.038%
8/13/2025 New York State Common Retirement Fund6,800$118K0.0%N/A0.015%


SION Institutional Ownership - Frequently Asked Questions

During the previous two years, 80 institutional investors and hedge funds held shares of Sionna Therapeutics. The most heavily invested institutionals were RA Capital Management L.P. ($407.49M), Orbimed Advisors LLC ($141.55M), Atlas Venture Life Science Advisors LLC ($123.24M), TPG GP A LLC ($69.93M), BlackRock Inc. ($64.88M), Jennison Associates LLC ($58.18M), and Viking Global Investors LP ($55.44M).Learn more on Sionna Therapeutics' institutional investors.

Of the 75 institutional investors that purchased Sionna Therapeutics' stock in the last 24 months, the following investors and hedge funds have bought the highest volume of shares: RA Capital Management L.P. ($10.45M), TPG GP A LLC ($6.68M), Atlas Venture Life Science Advisors LLC ($3.69M), BlackRock Inc. ($1.47M), Jennison Associates LLC ($1.31M), Braidwell LP ($1.08M), and Aberdeen Group plc ($950.55K).

Institutional investors have bought a total of 7,405,778 shares in the last 24 months. This purchase volume represents approximately $259.02M in transactions.

Of the 22 institutional investors that sold Sionna Therapeutics' stock in the last 24 months, the following investors and hedge funds have sold the highest volume of shares: JPMorgan Chase & Co. ($1.23M), Braidwell LP ($767.84K), Atlas Venture Life Science Advisors LLC ($698.42K), Perceptive Advisors LLC ($555.72K), RA Capital Management L.P. ($540.28K), Franklin Resources Inc. ($324.54K), and Orbimed Advisors LLC ($174.26K).

Institutional investors have sold a total of 4,810,906 shares in the last 24 months. This volume of shares sold represents approximately $175.62M in transactions.


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Institutional ownership data for NASDAQ:SION is compiled from quarterly 13F filings submitted to the U.S. Securities and Exchange Commission (SEC), with the most recent received on 8/7/2026. New 13F filings are added each quarter as they're published.
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