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Sionna Therapeutics (SION) Institutional Ownership

Sionna Therapeutics logo
$4.90 0.00 (0.00%)
Closing price 10/9/2026 04:00 PM Eastern
Extended Trading
$4.80 -0.11 (-2.14%)
As of 10/9/2026 07:54 PM Eastern
Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Massive. Learn more.
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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)
$244.50M
Number of
Institutional Sellers
(last 12 months)
23
Total
Institutional Outflows
(last 12 months)
$175.61M
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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
9/9/2026Engineers Gate Manager LP15,603$686K0.0%N/A0.035%
9/9/2026Maven Securities LTD20,000$880K0.0%-20.0%0.044%
9/9/2026Squarepoint Ops LLC5,415$238K0.0%-64.4%0.012%
8/21/2026AXQ Capital LP4,597$202K0.0%N/A0.010%
8/19/2026UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC10,622$467K0.0%+9,056.9%0.023%
8/19/2026Wellington Management Group LLP37,365$1.64M0.0%N/A0.083%
8/17/2026Artia Global Partners LP119,741$5.27M1.0%N/A0.265%
8/17/2026Bank of America Corp DE88,908$3.91M0.0%N/A0.197%
8/15/2026Jupiter Topco LLC6,400$281K0.0%N/A0.014%
8/14/2026Legal & General Group Plc9,044$398K0.0%N/A0.020%
8/14/2026The Manufacturers Life Insurance Company35,420$1.56M0.0%N/A0.078%
8/12/2026Quantbot Technologies LP1,820$80K0.0%N/A0.004%
8/7/2026BlackRock Inc.1,474,769$64.88M0.0%N/A3.266%
8/7/2026Deutsche Bank AG53,353$2.35M0.0%N/A0.118%
8/7/2026Mitsubishi UFJ Asset Management Co. Ltd.1,000$44K0.0%N/A0.002%
8/6/2026Bank of New York Mellon Corp41,586$1.83M0.0%N/A0.092%
8/6/2026State of Wyoming804$35K0.0%N/A0.002%
8/3/2026Walleye 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%
5/14/2026Walleye Capital LLC15,097$605K0.0%N/A0.033%
5/7/2026AlphaCentric Advisors LLC4,818$193K0.2%+77.1%0.011%
5/6/2026Jennison Associates LLC1,451,220$58.18M0.0%+30.1%3.215%
5/5/2026Bank 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%
4/25/2026Strs 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%
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2/17/2026Russell 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%
2/13/2026Police & Firemen s Retirement System of New Jersey4,232$174K0.0%+30.9%0.009%
2/13/2026State 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%
2/12/2026AlphaCentric Advisors LLC2,720$112K0.1%N/A0.006%
2/12/2026CIBC Private Wealth Group LLC4,500$185K0.0%N/A0.010%
2/12/2026Alps Advisors Inc.36,648$1.51M0.0%N/A0.082%
2/12/2026Nuveen LLC23,734$976K0.0%+48.0%0.053%
2/11/2026Deutsche 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%
2/10/2026TD 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%
1/30/2026Jennison 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%
1/29/2026China Universal Asset Management Co. Ltd.10,272$423K0.0%+105.4%0.023%
1/27/2026GF Fund Management CO. LTD.876$36K0.0%N/A0.002%
1/26/2026Mirae Asset Global Investments Co. Ltd.2,169$89K0.0%N/A0.005%
1/16/2026Aberdeen Group plc839,960$34.56M0.1%-11.6%1.882%
1/9/2026SG 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%
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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%
11/13/2025Russell Investments Group Ltd.1,022$30K0.0%N/A0.002%
11/12/2025Intech Investment Management LLC7,486$220K0.0%N/A0.017%
11/10/2025TD Asset Management Inc87,082$2.56M0.0%+74.3%0.195%
11/10/2025China 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%


SION Institutional Ownership - Frequently Asked Questions

During the previous two years, 86 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 6,063,602 shares in the last 24 months. This purchase volume represents approximately $244.50M in transactions.

Of the 23 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 4,787,925 shares in the last 24 months. This volume of shares sold represents approximately $175.61M 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 9/9/2026. New 13F filings are added each quarter as they're published.
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