Stock Ownership/SION

SIONNA THERAPEUTICS INC (SION): Ownership & Insider Activity

Hedge funds and institutional managers reporting a position in SION · Health Care. Based on the most recent 13F filing from each holder, sourced from SEC EDGAR.

Reported Holders
14
13F filers
Aggregate Value
$422.5M
Across holders
Last Price
$5.59
2026-08-24
Sector
Health Care
GICS
Quarterly fund activity7 increased5 reduced2 exited
Full exits: Hudson Bay Capital Management LP, TWO SIGMA INVESTMENTS, LP
Institutional Holders of SION
↗
14 holders
Manager⇅Type⇅Shares⇅Market Value▼% of Total⇅% of Portfolio⇅Action⇅QoQ Change⇅Quarter⇅
VIKING GLOBAL INVESTORS LP
CIK 0001103804
Hedge Fund3.20M$140.6M33.3%0.4%Unchanged+$0Q2 2026
ORBIMED ADVISORS LLC
CIK 0001055951
Hedge Fund2.56M$112.4M26.6%2.1%Reduced$-42.9MQ2 2026
ADAGE CAPITAL PARTNERS GP, L.L.C.
CIK 0001165408
Hedge Fund1.60M$70.4M16.7%0.1%Added+$63.8MQ2 2026
CITADEL ADVISORS LLC
CIK 0001423053
Hedge Fund1.15M$50.5M11.9%0.0%Reduced+$48.1MQ2 2026
BAKER BROS. ADVISORS LP
CIK 0001263508
Hedge Fund400K$17.6M4.2%0.1%Unchanged+$0Q2 2026
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
Hedge Fund277K$12.2M2.9%0.0%Added+$6.0MQ2 2026
Qube Research & Technologies Ltd
CIK 0001729829
Hedge Fund140K$6.2M1.5%0.0%Added+$4.3MQ2 2026
SHAW D E & CO INC
CIK 0001009207
Hedge Fund102K$4.5M1.1%0.0%Added—Q2 2026
Walleye Capital LLC
CIK 0001758720
Hedge Fund97K$4.3M1.0%0.0%Added+$3.6MQ2 2026
Point72 Asset Management, L.P.
CIK 0001603466
Hedge Fund49K$2.2M0.5%0.0%Reduced$-3.8MQ2 2026
VIKING GLOBAL INVESTORS LPUnchanged
Hedge Fund
$140.6M· 33.3% of total· 0.4% port· 3.20M sh· +$0 QoQ· Q2 2026
ORBIMED ADVISORS LLCReduced
Hedge Fund
$112.4M· 26.6% of total· 2.1% port· 2.56M sh· $-42.9M QoQ· Q2 2026
ADAGE CAPITAL PARTNERS GP, L.L.C.Added
Hedge Fund
$70.4M· 16.7% of total· 0.1% port· 1.60M sh· +$63.8M QoQ· Q2 2026
CITADEL ADVISORS LLCReduced
Hedge Fund
$50.5M· 11.9% of total· 0.0% port· 1.15M sh· +$48.1M QoQ· Q2 2026
BAKER BROS. ADVISORS LPUnchanged
Hedge Fund
$17.6M· 4.2% of total· 0.1% port· 400K sh· +$0 QoQ· Q2 2026
MILLENNIUM MANAGEMENT LLCAdded
Hedge Fund
$12.2M· 2.9% of total· 0.0% port· 277K sh· +$6.0M QoQ· Q2 2026
Qube Research & Technologies LtdAdded
Hedge Fund
$6.2M· 1.5% of total· 0.0% port· 140K sh· +$4.3M QoQ· Q2 2026
SHAW D E & CO INCAdded
Hedge Fund
$4.5M· 1.1% of total· 0.0% port· 102K sh· — QoQ· Q2 2026
Walleye Capital LLCAdded
Hedge Fund
$4.3M· 1.0% of total· 0.0% port· 97K sh· +$3.6M QoQ· Q2 2026
Point72 Asset Management, L.P.Reduced
Hedge Fund
$2.2M· 0.5% of total· 0.0% port· 49K sh· $-3.8M QoQ· Q2 2026
TUDOR INVESTMENT CORP ET ALAdded
Hedge Fund
$993K· 0.2% of total· 0.0% port· 23K sh· — QoQ· Q2 2026
MARSHALL WACE, LLPAdded
Hedge Fund
$554K· 0.1% of total· 0.0% port· 13K sh· — QoQ· Q2 2026
Squarepoint Ops LLCReduced
Hedge Fund
$238K· 0.1% of total· 0.0% port· 5K sh· $-431K QoQ· Q2 2026
Rockefeller Capital Management L.P.Reduced
Hedge Fund
$5K· 0.0% of total· 0.0% port· 114 sh· $-12K QoQ· Q2 2026
1–10 of 14
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