Stock Ownership/PEN

PENUMBRA INC (PEN): Ownership & Insider Activity

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

Reported Holders
32
13F filers
Aggregate Value
$2.8B
Across holders
Last Price
$323.75
2026-08-24
Sector
Health Care
GICS
Quarterly fund activity17 increased13 reduced6 exited
Full exits: BAILLIE GIFFORD & CO, MOORE CAPITAL MANAGEMENT, LP, Grantham, Mayo, Van Otterloo & Co. LLC, FRED ALGER MANAGEMENT, LLC, SOROS FUND MANAGEMENT LLC, Clearbridge Investments, LLC
Institutional Holders of PEN
↗
32 holders
Manager⇅Type⇅Shares⇅Market Value▼% of Total⇅% of Portfolio⇅Action⇅QoQ Change⇅Quarter⇅
HBK INVESTMENTS L P
CIK 0001011443
Hedge Fund1.84M$580.5M20.8%5.7%Added+$64.5MQ2 2026
ExodusPoint Capital Management, LP
CIK 0001736225
Hedge Fund1.09M$344.3M12.3%2.2%Added—Q2 2026
BALYASNY ASSET MANAGEMENT LLC
CIK 0001218710
Hedge Fund1.09M$344.2M12.3%0.4%Added+$103.6MQ2 2026
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP
CIK 0001164508
Hedge Fund835K$263.6M9.4%0.1%Added+$137.3MQ2 2026
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
Hedge Fund701K$221.2M7.9%0.1%Reduced+$206.1MQ2 2026
CITADEL ADVISORS LLC
CIK 0001423053
Hedge Fund449K$141.7M5.1%0.0%Added+$49.9MQ2 2026
TWO SIGMA INVESTMENTS, LP
CIK 0001179392
Hedge Fund428K$135.2M4.8%0.1%Added+$116.8MQ2 2026
TUDOR INVESTMENT CORP ET AL
CIK 0000923093
Hedge Fund401K$126.5M4.5%0.2%Reduced$-3.3MQ2 2026
Magnetar Financial LLC
CIK 0001352851
Hedge Fund256K$80.8M2.9%0.7%Added$-29.0MQ2 2026
Hudson Bay Capital Management LP
CIK 0001393825
Hedge Fund203K$64.1M2.3%0.2%Reduced$-22.5MQ2 2026
HBK INVESTMENTS L PAdded
Hedge Fund
$580.5M· 20.8% of total· 5.7% port· 1.84M sh· +$64.5M QoQ· Q2 2026
ExodusPoint Capital Management, LPAdded
Hedge Fund
$344.3M· 12.3% of total· 2.2% port· 1.09M sh· — QoQ· Q2 2026
BALYASNY ASSET MANAGEMENT LLCAdded
Hedge Fund
$344.2M· 12.3% of total· 0.4% port· 1.09M sh· +$103.6M QoQ· Q2 2026
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPAdded
Hedge Fund
$263.6M· 9.4% of total· 0.1% port· 835K sh· +$137.3M QoQ· Q2 2026
MILLENNIUM MANAGEMENT LLCReduced
Hedge Fund
$221.2M· 7.9% of total· 0.1% port· 701K sh· +$206.1M QoQ· Q2 2026
CITADEL ADVISORS LLCAdded
Hedge Fund
$141.7M· 5.1% of total· 0.0% port· 449K sh· +$49.9M QoQ· Q2 2026
TWO SIGMA INVESTMENTS, LPAdded
Hedge Fund
$135.2M· 4.8% of total· 0.1% port· 428K sh· +$116.8M QoQ· Q2 2026
TUDOR INVESTMENT CORP ET ALReduced
Hedge Fund
$126.5M· 4.5% of total· 0.2% port· 401K sh· $-3.3M QoQ· Q2 2026
Magnetar Financial LLCAdded
Hedge Fund
$80.8M· 2.9% of total· 0.7% port· 256K sh· $-29.0M QoQ· Q2 2026
Hudson Bay Capital Management LPReduced
Hedge Fund
$64.1M· 2.3% of total· 0.2% port· 203K sh· $-22.5M QoQ· Q2 2026
SHAW D E & CO INCReduced
Hedge Fund
$62.3M· 2.2% of total· 0.0% port· 197K sh· +$61.7M QoQ· Q2 2026
CAXTON ASSOCIATES LLPReduced
Hedge Fund
$56.6M· 2.0% of total· 1.1% port· 179K sh· $-1.7M QoQ· Q2 2026
ADAGE CAPITAL PARTNERS GP, L.L.C.Added
Hedge Fund
$55.8M· 2.0% of total· 0.1% port· 177K sh· +$13.2M QoQ· Q2 2026
Woodline Partners LPReduced
Hedge Fund
$46.1M· 1.6% of total· 0.1% port· 146K sh· $-30.2M QoQ· Q2 2026
Verition Fund Management LLCAdded
Hedge Fund
$44.9M· 1.6% of total· 0.2% port· 142K sh· +$23.5M QoQ· Q2 2026
Squarepoint Ops LLCReduced
Hedge Fund
$43.7M· 1.6% of total· 0.0% port· 138K sh· $-3.0M QoQ· Q2 2026
Holocene Advisors, LPAdded
Hedge Fund
$40.4M· 1.4% of total· 0.1% port· 128K sh· +$5.5M QoQ· Q2 2026
MARSHALL WACE, LLPAdded
Hedge Fund
$28.6M· 1.0% of total· 0.0% port· 91K sh· +$19.0M QoQ· Q2 2026
Man Group plcAdded
Hedge Fund
$25.3M· 0.9% of total· 0.0% port· 80K sh· $-10.2M QoQ· Q2 2026
RENAISSANCE TECHNOLOGIES LLCAdded
Hedge Fund
$25.1M· 0.9% of total· 0.0% port· 80K sh· +$24.4M QoQ· Q2 2026
Sculptor Capital LPUnchanged
Hedge Fund
$18.0M· 0.6% of total· 0.1% port· 57K sh· +$0 QoQ· Q2 2026
Gotham Asset Management, LLCAdded
Hedge Fund
$10.1M· 0.4% of total· 0.0% port· 32K sh· +$7.3M QoQ· Q2 2026
AQR CAPITAL MANAGEMENT LLCReduced
Hedge Fund
$10.0M· 0.4% of total· 0.0% port· 32K sh· +$6.6M QoQ· Q2 2026
PRIMECAP MANAGEMENT CO/CA/Reduced
Institutional Manager
$8.2M· 0.3% of total· 0.0% port· 26K sh· $-63K QoQ· Q2 2026
Schonfeld Strategic Advisors LLCAdded
Hedge Fund
$6.2M· 0.2% of total· 0.0% port· 20K sh· +$5.9M QoQ· Q2 2026
Fortress Investment Group LLCAdded
Hedge Fund
$5.4M· 0.2% of total· 1.0% port· 17K sh· +$777K QoQ· Q2 2026
Lighthouse Investment Partners, LLCReduced
Hedge Fund
$4.6M· 0.2% of total· 0.1% port· 15K sh· $-2.8M QoQ· Q2 2026
Point72 Asset Management, L.P.Added
Hedge Fund
$2.1M· 0.1% of total· 0.0% port· 7K sh· — QoQ· Q2 2026
PineBridge Investments, L.P.Reduced
Hedge Fund
$527K· 0.0% of total· 0.0% port· 2K sh· $-1.5M QoQ· Q3 2025
Bridgewater Associates, LPReduced
Hedge Fund
$499K· 0.0% of total· 0.0% port· 2K sh· $-2.7M QoQ· Q2 2026
Rockefeller Capital Management L.P.Reduced
Hedge Fund
$308K· 0.0% of total· 0.0% port· 974 sh· $-223K QoQ· Q2 2026
Ancora Advisors, LLCUnchanged
Hedge Fund
$3K· 0.0% of total· 0.0% port· 10 sh· +$0 QoQ· Q2 2026
1–10 of 32
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