Stock Ownership/TNDM

TANDEM DIABETES CARE INC (TNDM): Ownership & Insider Activity

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

Reported Holders
20
13F filers
Aggregate Value
$178.9M
Across holders
Last Price
$22.22
2026-08-24
Sector
Health Care
GICS
Quarterly fund activity14 increased6 reduced4 exited
Full exits: BAILLIE GIFFORD & CO, RENAISSANCE TECHNOLOGIES LLC, MARSHALL WACE, LLP, Ancora Advisors, LLC
Institutional Holders of TNDM
↗
20 holders
Manager⇅Type⇅Shares⇅Market Value▼% of Total⇅% of Portfolio⇅Action⇅QoQ Change⇅Quarter⇅
CITADEL ADVISORS LLC
CIK 0001423053
Hedge Fund1.74M$26.2M14.6%0.0%Reduced$-40.0MQ2 2026
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
Hedge Fund1.31M$19.8M11.1%0.0%Added+$8.3MQ2 2026
Woodline Partners LP
CIK 0001784547
Hedge Fund1.31M$19.7M11.0%0.1%Added—Q2 2026
ArrowMark Colorado Holdings LLC
CIK 0001483859
Hedge Fund1.30M$19.6M11.0%0.8%Reduced$-27.2MQ2 2026
Verition Fund Management LLC
CIK 0001454027
Hedge Fund700K$10.6M5.9%0.1%Added+$8.9MQ2 2026
ExodusPoint Capital Management, LP
CIK 0001736225
Hedge Fund692K$10.4M5.8%0.1%Added—Q2 2026
Qube Research & Technologies Ltd
CIK 0001729829
Hedge Fund684K$10.3M5.8%0.0%Added+$9.5MQ2 2026
SHAW D E & CO INC
CIK 0001009207
Hedge Fund682K$10.3M5.8%0.0%Reduced+$9.3MQ2 2026
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP
CIK 0001164508
Hedge Fund668K$10.1M5.6%0.0%Added+$7.2MQ2 2026
Point72 Asset Management, L.P.
CIK 0001603466
Hedge Fund611K$9.2M5.2%0.0%Added+$7.9MQ2 2026
CITADEL ADVISORS LLCReduced
Hedge Fund
$26.2M· 14.6% of total· 0.0% port· 1.74M sh· $-40.0M QoQ· Q2 2026
MILLENNIUM MANAGEMENT LLCAdded
Hedge Fund
$19.8M· 11.1% of total· 0.0% port· 1.31M sh· +$8.3M QoQ· Q2 2026
Woodline Partners LPAdded
Hedge Fund
$19.7M· 11.0% of total· 0.1% port· 1.31M sh· — QoQ· Q2 2026
ArrowMark Colorado Holdings LLCReduced
Hedge Fund
$19.6M· 11.0% of total· 0.8% port· 1.30M sh· $-27.2M QoQ· Q2 2026
Verition Fund Management LLCAdded
Hedge Fund
$10.6M· 5.9% of total· 0.1% port· 700K sh· +$8.9M QoQ· Q2 2026
ExodusPoint Capital Management, LPAdded
Hedge Fund
$10.4M· 5.8% of total· 0.1% port· 692K sh· — QoQ· Q2 2026
Qube Research & Technologies LtdAdded
Hedge Fund
$10.3M· 5.8% of total· 0.0% port· 684K sh· +$9.5M QoQ· Q2 2026
SHAW D E & CO INCReduced
Hedge Fund
$10.3M· 5.8% of total· 0.0% port· 682K sh· +$9.3M QoQ· Q2 2026
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPAdded
Hedge Fund
$10.1M· 5.6% of total· 0.0% port· 668K sh· +$7.2M QoQ· Q2 2026
Point72 Asset Management, L.P.Added
Hedge Fund
$9.2M· 5.2% of total· 0.0% port· 611K sh· +$7.9M QoQ· Q2 2026
TWO SIGMA INVESTMENTS, LPReduced
Hedge Fund
$8.4M· 4.7% of total· 0.0% port· 558K sh· $-19.7M QoQ· Q2 2026
AQR CAPITAL MANAGEMENT LLCAdded
Hedge Fund
$8.1M· 4.5% of total· 0.0% port· 534K sh· +$8.0M QoQ· Q2 2026
TUDOR INVESTMENT CORP ET ALAdded
Hedge Fund
$5.5M· 3.1% of total· 0.0% port· 363K sh· +$4.3M QoQ· Q2 2026
Holocene Advisors, LPReduced
Hedge Fund
$4.0M· 2.3% of total· 0.0% port· 268K sh· $-3.2M QoQ· Q2 2026
Squarepoint Ops LLCAdded
Hedge Fund
$3.3M· 1.8% of total· 0.0% port· 217K sh· — QoQ· Q2 2026
Schonfeld Strategic Advisors LLCAdded
Hedge Fund
$2.0M· 1.1% of total· 0.0% port· 130K sh· — QoQ· Q2 2026
Man Group plcAdded
Hedge Fund
$769K· 0.4% of total· 0.0% port· 51K sh· — QoQ· Q2 2026
Brevan Howard Capital Management LPAdded
Hedge Fund
$619K· 0.3% of total· 0.0% port· 41K sh· +$41K QoQ· Q2 2026
Fulcrum Asset Management LLPAdded
Hedge Fund
$4K· 0.0% of total· 0.0% port· 280 sh· — QoQ· Q2 2026
Rockefeller Capital Management L.P.Reduced
Hedge Fund
$4K· 0.0% of total· 0.0% port· 260 sh· $-13K QoQ· Q2 2026
1–10 of 20
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