InvestorLens

SION — SIONNA THERAPEUTICS INC

Public company

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For educational research only.InvestorLens analyzes public regulatory filings (SEC EDGAR, STOCK Act PTRs) that may be delayed by 45 days or more. Information shown is historical and is not financial, legal, or tax advice, nor a recommendation or solicitation to buy or sell any security. Always do your own research.

InvestorLens aggregates public filing data to show which tracked investors reported holdings in this stock. Dollar values represent reported position values, not market capitalization, and may be delayed up to 45 days. Not a recommendation.

Sourced from SEC EDGAR public filings

About SIONNA THERAPEUTICS INC (SION)

SIONNA THERAPEUTICS INC (SION) appears in the most recent 13F filings of 4 tracked institutional investors. The largest disclosed position is held by Andreas Halvorsen (Viking Global Investors), valued at $131M. Across recent filings, tracked investors recorded 2 new positions, 0 increased, 0 reduced, and 0 exited. All data sourced from SEC 13F filings.

Smart Money Consensus™

Based on recent institutional activity in SION

100
/100
Strong Institutional Accumulation
Added / Increased2
Reduced0
Exited0
BearishBullish
Crowded Trade Score™

How many top investors track SION

27
/100
Emerging Interest
4investors

A small number of top investors own this.

UndiscoveredCrowded
151015+

SION Ownership Composition

How SIONNA THERAPEUTICS INC is held across tracked investor types, based on reported 13F positions.

Dominant Type
Other
97% of tracked value
Institutions
4
tracked investors
Total Reported
$186M
combined 13F value
Sectors2
  • Other97.1%
  • Hedge Funds2.9%
Other(3)
97.1%
Hedge Funds(1)
2.9%

Tracked investors reporting SION

  • Andreas HalvorsenMar 31, 2026
    Viking Global Investors
    Shares
    3.2M
    Value
    $128.1M
    % Portfolio
    0.36%
  • Ken GriffinMar 31, 2026
    Citadel Advisors
    Shares
    1.2M
    Value
    $46.8M
    % Portfolio
    0.01%
  • Izzy EnglanderMar 31, 2026
    Millennium Management
    Shares
    140.6K
    Value
    $5.6M
    % Portfolio
    0.00%
  • Steve CohenMar 31, 2026
    Point72 Asset Management
    Shares
    136.5K
    Value
    $5.5M
    % Portfolio
    0.01%

Recent activity

Frequently asked questions

How many institutional investors hold SION?
4 tracked institutional investors disclosed a position in SION (SIONNA THERAPEUTICS INC) in their most recent 13F filing.
Who is the largest institutional holder of SION?
Andreas Halvorsen, Viking Global Investors, holds the largest disclosed position in SION, valued at $131M.
Did institutional ownership of SION increase or decrease?
Across recent 13F filings, tracked investors recorded 2 new positions, 0 increased, 0 reduced, and 0 fully exited SION.
Where does this SION ownership data come from?
SEC Form 13F-HR filings, accessed via EDGAR. 13F filings are disclosed quarterly with a 45-day reporting delay and cover U.S.-listed long equity positions only. This is not investment advice.
SION (SIONNA THERAPEUTICS INC) — Institutional Holders & — InvestorLens