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Sionna Therapeutics (SION) Institutional Ownership

Sionna Therapeutics logo
$5.87 0.00 (0.00%)
As of 08/28/2026 04:00 PM Eastern
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Institutional Ownership Changes (13F Filings) for Sionna Therapeutics (NASDAQ:SION)

Number of
Institutional Buyers
(last 12 months)
59
Total
Institutional Inflows
(last 12 months)
$272.52M
Number of
Institutional Sellers
(last 12 months)
21
Total
Institutional Outflows
(last 12 months)
$174.96M
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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
8/24/2026 California State Teachers Retirement System653,339$28.74M0.0%+75,169.5%1.445%
8/21/2026 AXQ Capital LP4,597$202K0.0%N/A0.010%
8/19/2026 UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC10,622$467K0.0%+9,056.9%0.023%
8/19/2026 Wellington Management Group LLP37,365$1.64M0.0%N/A0.083%
8/17/2026 Artia Global Partners LP119,741$5.27M1.0%N/A0.265%
8/17/2026 Bank of America Corp DE88,908$3.91M0.0%N/A0.197%
8/15/2026 Jupiter Topco LLC6,400$281K0.0%N/A0.014%
8/14/2026 Legal & General Group Plc9,044$398K0.0%N/A0.020%
8/14/2026 The Manufacturers Life Insurance Company 35,420$1.56M0.0%N/A0.078%
8/12/2026 Quantbot Technologies LP1,820$80K0.0%N/A0.004%
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%
5/29/2026 Perceptive Advisors LLC658,439$26.40M0.5%-44.2%1.458%
5/19/2026 Bank of America Corp DE50,870$2.04M0.0%+16.8%0.113%
5/19/2026 Stempoint Capital LP36,540$1.47M0.3%N/A0.081%
5/16/2026 The Manufacturers Life Insurance Company64,458$2.58M0.0%-7.2%0.143%
5/16/2026 Orbimed 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%
5/1/2026 Candriam S.C.A.236,813$9.49M0.0%N/A0.525%
4/25/2026 Strs Ohio2,900$116K0.0%N/A0.006%
2/19/2026 Invesco Ltd.111,162$4.57M0.0%N/A0.249%
2/18/2026 XTX Topco Ltd4,926$203K0.0%N/A0.011%
2/18/2026 Virtus Investment Advisers LLC6,220$256K0.1%-7.1%0.014%
2/18/2026 Wellington Management Group LLP38,347$1.58M0.0%-9.2%0.086%
2/18/2026 Superstring Capital Management LP180,593$7.43M4.0%N/A0.405%
2/18/2026 Orbimed Advisors LLC3,561,655$146.53M3.1%-3.9%7.981%
2/18/2026 Millennium Management LLC80,546$3.31M0.0%-62.4%0.180%
2/18/2026 Artia Global Partners LP119,741$4.93M0.7%N/A0.268%
2/18/2026 Balyasny Asset Management L.P.1,406$58K0.0%N/A0.003%
2/17/2026 RA Capital Management L.P.9,905,045$407.49M4.2%-5.2%22.194%
2/17/2026 Price 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%
2/16/2026 Squarepoint Ops LLC16,360$673K0.0%+61.0%0.037%
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2/16/2026 Kennedy Capital Management LLC6,752$278K0.0%N/A0.015%
2/16/2026 Eventide Asset Management LLC639,045$26.29M0.4%N/A1.432%
2/16/2026 Barclays PLC48,172$1.98M0.0%+173.0%0.108%
2/13/2026 The Manufacturers Life Insurance Company 69,424$2.87M0.0%+116.4%0.156%
2/13/2026 Kalehua Capital Management LLC197,072$8.11M7.5%N/A0.442%
2/13/2026 Rafferty Asset Management LLC24,690$1.02M0.0%N/A0.055%
2/13/2026 Alyeska Investment Group L.P.136,222$5.60M0.0%-26.8%0.305%
2/13/2026 Siren L.L.C.300,000$12.34M0.4%-7.7%0.672%
2/13/2026 Charles 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%
2/13/2026 State Street Corp693,395$28.53M0.0%+188.7%1.554%
2/13/2026 Wells Fargo & Company MN17,551$722K0.0%+131.7%0.039%
2/13/2026 Atlas Venture Life Science Advisors LLC2,995,602$123.24M14.2%-17.1%6.712%
2/12/2026 MetLife Investment Management LLC8,565$352K0.0%+6.6%0.019%
2/12/2026 Ensign 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%
2/12/2026 Nuveen LLC23,734$976K0.0%+48.0%0.053%
2/11/2026 Deutsche Bank AG10,029$413K0.0%+4.5%0.022%
2/11/2026 Franklin Resources Inc.175,483$7.22M0.0%-27.5%0.393%
2/11/2026 JPMorgan Chase & Co.1,231,819$50.68M0.0%-37.7%2.760%
2/11/2026 Los 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%
2/10/2026 Goldman Sachs Group Inc.36,269$1.49M0.0%+197.8%0.081%
2/10/2026 Seven Grand Managers LLC50,000$2.06M0.2%N/A0.112%
2/9/2026 Geode Capital Management LLC380,042$15.64M0.0%+20.1%0.852%
2/6/2026 ProShare Advisors LLC4,903$202K0.0%N/A0.011%
1/30/2026 Jennison Associates LLC1,115,278$45.88M0.0%+11.8%2.499%
1/29/2026 UBS 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%
11/26/2025 JPMorgan Chase & Co.1,978,626$58.19M0.0%-10.9%4.433%
11/17/2025 Millennium Management LLC214,085$6.30M0.0%+1,425.5%0.480%
11/17/2025 MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.5,643$166K0.0%-16.4%0.013%
11/17/2025 Jain Global LLC8,513$250K0.0%N/A0.019%
11/17/2025 Citadel Advisors LLC35,923$1.06M0.0%-72.3%0.080%
11/17/2025 Bank of America Corp DE6,541$192K0.0%+8.8%0.015%
11/17/2025 Braidwell LP314,013$9.24M0.3%-71.0%0.704%
11/17/2025 Ameriprise Financial Inc.153,151$4.50M0.0%-35.3%0.343%
11/14/2025 Longaeva Partners L.P.61,457$1.81M0.3%N/A0.138%
11/14/2025 Squarepoint Ops LLC10,162$299K0.0%N/A0.023%
11/14/2025 Atlas Venture Life Science Advisors LLC3,615,527$106.33M14.1%-2.1%8.101%
11/13/2025 UBS Group AG46,666$1.37M0.0%-9.2%0.105%
11/13/2025 BNP Paribas Financial Markets2,380$70K0.0%+35.2%0.005%
11/13/2025 Franklin Resources Inc.242,147$7.12M0.0%-51.6%0.543%
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11/13/2025 Legal & General Group Plc7,374$217K0.0%+436.7%0.017%
11/13/2025 Russell Investments Group Ltd.1,022$30K0.0%N/A0.002%
11/12/2025 Intech 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%
11/7/2025 JPMorgan Chase & Co.1,978,626$58.19M0.0%-10.9%4.483%
11/6/2025 Rhumbline Advisers17,240$507K0.0%-2.4%0.039%
11/3/2025 New York State Common Retirement Fund5,300$156K0.0%-22.1%0.012%
8/15/2025 Soleus Capital Management L.P.376,000$6.52M0.4%+56.7%0.852%


SION Institutional Ownership - Frequently Asked Questions

During the previous two years, 85 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 81 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 6,700,470 shares in the last 24 months. This purchase volume represents approximately $272.52M in transactions.

Of the 21 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), RA Capital Management L.P. ($540.28K), Perceptive Advisors LLC ($520.66K), Franklin Resources Inc. ($324.54K), and Orbimed Advisors LLC ($174.26K).

Institutional investors have sold a total of 4,773,123 shares in the last 24 months. This volume of shares sold represents approximately $174.96M 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 8/24/2026. New 13F filings are added each quarter as they're published.
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