TANDEM DIABETES CARE INC (TNDM) Institutional Ownership Changes & 13F Activity

TANDEM DIABETES CARE INC (TNDM). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings (Q2 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions in the latest reporting period. Notable filers include First Light Asset Management, Llc, Goldman Sachs Group Inc, Woodline Partners Lp, Two Sigma Investments, Lp, and Qube Research & Technologies Ltd.

InstitutionTypeChange in sharesChange Position %SharesReported stock balancePortfolio quarterFiling date
Manufacturers Life Insurance Company, TheSell-238-0.8%28,484$429.82KQ2 2026Sep 09, 2026
Citadel Advisors LlcSell-456,788-20.8%1,735,879$26.19MQ2 2026Sep 02, 2026
Corient Private Wealth LlcSell-17,152-50.8%16,589$250.33KQ2 2026Aug 27, 2026
California State Teachers Retirement SystemSell-7,028-8.3%77,227$1.17MQ2 2026Aug 24, 2026
Assenagon Asset Management S.A.Sell-152,210-85.2%26,430$398.83KQ2 2026Aug 21, 2026
Mercer Global Advisors IncSell-3,800-18.8%16,412$247.66KQ2 2026Aug 19, 2026
Archer Investment CorpBuy+4545$679.00Q2 2026Aug 19, 2026
Fulcrum Asset Management LlpBuy+280280$4.43KQ2 2026Aug 18, 2026
Jefferies Financial Group Inc.Buy+109,767+193.5%166,489$2.51MQ2 2026Aug 17, 2026
Proficio Capital Partners LlcBuy+11,89711,897$179.53KQ2 2026Aug 17, 2026
Formula Growth LtdSell-524-0.7%70,304$1.06MQ2 2026Aug 17, 2026
Transamerica Financial Advisors, LlcSell-372-95.6%17$256.00Q2 2026Aug 17, 2026
First Light Asset Management, LlcBuy+2,068,838+157.4%3,383,553$51.06MQ2 2026Aug 14, 2026
Goldman Sachs Group IncSell-1,356,621-61.1%862,301$13.01MQ2 2026Aug 14, 2026
Woodline Partners LpBuy+1,307,4391,307,439$19.73MQ2 2026Aug 14, 2026
Two Sigma Investments, LpSell-1,305,785-70.0%558,409$8.43MQ2 2026Aug 14, 2026
Qube Research & Technologies LtdBuy+631,862+1216.0%683,823$10.32MQ2 2026Aug 14, 2026
Verition Fund Management LlcBuy+592,881+553.5%700,000$10.56MQ2 2026Aug 14, 2026
Millennium Management LlcBuy+550,067+72.2%1,311,739$19.79MQ2 2026Aug 14, 2026
Freestone Grove Partners LpBuy+535,392+40.2%1,866,134$28.16MQ2 2026Aug 14, 2026
Driehaus Capital Management LlcSell-517,418-22.5%1,786,996$26.97MQ2 2026Aug 14, 2026
Jacobs Levy Equity Management, IncBuy+482,483+31.7%2,006,429$30.28MQ2 2026Aug 14, 2026
Sessa Capital Im, L.P.Buy+369,243+7.8%5,100,000$76.96MQ2 2026Aug 14, 2026
Invesco Ltd.Buy+321,128321,128$4.85MQ2 2026Aug 14, 2026
Meridiem Capital Partners LpBuy+298,255298,255$4.50MQ2 2026Aug 14, 2026
Tudor Investment Corp Et AlBuy+283,709+359.1%362,708$5.47MQ2 2026Aug 14, 2026
Squarepoint Ops LlcBuy+217,386217,386$3.28MQ2 2026Aug 14, 2026
Holocene Advisors, LpSell-209,499-43.9%267,860$4.04MQ2 2026Aug 14, 2026
Royce & Associates LpBuy+204,000+29.3%900,590$13.59MQ2 2026Aug 14, 2026
Aqr Capital Management LlcBuy+201,921+60.8%533,837$8.06MQ2 2026Aug 14, 2026
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Frequently asked questions about TNDM activity

  • Which institutional owners are buying TNDM?

    Institutional owners buying TNDM include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in TNDM activity?

    "Buy" means an investor increased their reported position in TNDM compared to the prior reporting period. This reflects growing exposure to TANDEM DIABETES CARE INC (TNDM) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in TNDM increasing?

    Institutional interest in TNDM can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.