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Tandem Diabetes Care (TNDM) Institutional Ownership

Tandem Diabetes Care logo
$16.50 0.00 (0.00%)
Closing price 04:00 PM Eastern
Extended Trading
$16.62 +0.12 (+0.72%)
As of 07:30 PM Eastern
Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Massive. Learn more.
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Institutional Ownership Changes (13F Filings) for Tandem Diabetes Care (NASDAQ:TNDM)

Number of
Institutional Buyers
(last 12 months)
112
Total
Institutional Inflows
(last 12 months)
$303.86M
Number of
Institutional Sellers
(last 12 months)
88
Total
Institutional Outflows
(last 12 months)
$273.92M
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TNDM Institutional Buying and Selling by Quarter

Tandem Diabetes Care Major Shareholders & Ownership History

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Reporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
9/9/2026First Light Asset Management LLC3,383,553$51.06M3.1%+157.4%4.863%
9/9/2026Engineers Gate Manager LP64,662$976K0.0%N/A0.093%
9/9/2026Integrated Wealth Concepts LLC2,189$33K0.0%N/A0.003%
9/9/2026Squarepoint Ops LLC217,386$3.28M0.0%N/A0.312%
8/27/2026Corient Private Wealth LP16,589$250K0.0%-50.8%0.024%
8/25/2026VIRGINIA RETIREMENT SYSTEMS ET Al26,200$395K0.0%N/A0.038%
8/20/2026Proficio Capital Partners LLC11,897$180K0.0%N/A0.017%
8/20/2026Beaconlight Capital LLC266,009$4.01M1.4%+4.8%0.382%
8/19/2026Prosperitas Financial LLC10,000$151K0.0%N/A0.014%
8/19/2026Wellington Management Group LLP871,811$13.16M0.0%-16.4%1.253%
7/10/2026Redhawk Wealth Advisors Inc.13,731$207K0.0%N/A0.020%
7/8/2026Assenagon Asset Management S.A.26,430$399K0.0%-85.2%0.039%
7/7/2026180 Wealth Advisors LLC24,934$376K0.0%+58.2%0.036%
7/7/2026GAMMA Investing LLC1,644$25K0.0%-53.1%0.002%
6/12/2026Defilade Capital Management L.P.761,905$14.61M2.1%N/A1.112%
5/19/2026Bank of America Corp DE373,224$7.16M0.0%-46.9%0.545%
5/18/2026Amundi12,615$242K0.0%-57.2%0.018%
5/18/2026California State Teachers Retirement System84,255$1.62M0.0%+30.8%0.123%
5/18/2026Royal Bank of Canada206,033$3.95M0.0%-1.2%0.301%
5/16/2026The Manufacturers Life Insurance Company28,722$551K0.0%-3.4%0.042%
5/16/2026Quantinno Capital Management LP653,870$12.54M0.0%+123.5%0.954%
5/16/2026First Light Asset Management LLC1,314,715$25.20M2.3%+20.7%1.918%
5/15/2026Rice Hall James & Associates LLC72,878$1.40M0.1%+16.8%0.106%
5/14/2026Renaissance Technologies LLC58,227$1.12M0.0%N/A0.085%
5/14/2026Gabelli Funds LLC25,000$479K0.0%N/A0.036%
5/14/2026Beaconlight Capital LLC253,877$4.87M2.6%N/A0.370%
5/14/2026Arrowstreet Capital Limited Partnership193,556$3.71M0.0%+42.6%0.282%
5/14/2026Mizuho Markets Americas LLC157,362$3.02M0.1%+8.8%0.230%
5/14/2026Sei Investments Co.95,306$1.83M0.0%-10.6%0.139%
5/14/2026State of Wyoming17,964$344K0.0%-43.5%0.026%
5/13/2026First Trust Advisors LP342,707$6.57M0.0%N/A0.500%
5/8/2026PNC Financial Services Group Inc.20,817$399K0.0%-6.8%0.030%
5/6/2026Jennison Associates LLC1,658,448$31.79M0.0%-18.0%2.421%
5/5/2026Bank of New York Mellon Corp336,291$6.45M0.0%-3.8%0.491%
5/4/2026Principal Financial Group Inc.331,541$6.36M0.0%+2.2%0.484%
5/1/2026180 Wealth Advisors LLC15,763$302K0.0%+17.3%0.023%
5/1/2026Fifth Third Bancorp22,605$433K0.0%+2,075.6%0.033%
4/30/2026Greenwood Capital Associates LLC13,941$267K0.0%-9.2%0.020%
4/27/2026Counterpoint Mutual Funds LLC12,679$243K0.0%-44.5%0.019%
4/27/2026New York State Teachers Retirement System66,096$1.27M0.0%-3.2%0.096%
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4/27/2026Y Intercept Hong Kong Ltd77,879$1.49M0.0%-7.3%0.114%
4/27/2026Leonteq Securities AG9,501$182K0.0%+21.7%0.014%
4/23/2026Inspire Investing LLC27,010$518K0.0%+28.2%0.039%
4/22/2026Pictet Asset Management Holding SA10,764$206K0.0%N/A0.016%
4/21/2026Louisiana State Employees Retirement System30,100$577K0.0%N/A0.044%
4/20/2026OP Asset Management Ltd1,835$35K0.0%N/A0.003%
4/20/2026Assenagon Asset Management S.A.178,640$3.43M0.0%-85.5%0.261%
4/16/2026SG Americas Securities LLC33,022$633K0.0%-46.7%0.048%
4/16/2026Diversified Trust Co21,332$409K0.0%+9.1%0.031%
3/20/2026Hsbc Holdings PLC36,553$810K0.0%-60.7%0.053%
3/9/2026Corient Private Wealth LLC19,535$429K0.0%N/A0.029%
2/19/2026Invesco Ltd.277,722$6.10M0.0%-8.1%0.410%
2/19/2026Corient Private Wealth LLC15,748$346K0.0%N/A0.023%
2/18/2026Mercer Global Advisors Inc. ADV11,294$248K0.0%N/A0.017%
2/18/2026State of Tennessee Department of Treasury21,514$473K0.0%-33.4%0.032%
2/18/2026EP Wealth Advisors LLC9,977$219K0.0%N/A0.015%
2/18/2026Wellington Management Group LLP98,309$2.16M0.0%N/A0.145%
2/18/2026Susquehanna Portfolio Strategies LLC66,452$1.46M0.0%-67.8%0.098%
2/18/2026Millennium Management LLC583,573$12.83M0.0%-17.3%0.861%
2/18/2026Man Group plc12,782$281K0.0%N/A0.019%
2/18/2026Inspire Investing LLC21,066$463K0.0%-45.2%0.031%
2/18/2026Engineers Gate Manager LP88,547$1.95M0.0%N/A0.131%
2/18/2026Balyasny Asset Management L.P.262,788$5.78M0.0%N/A0.388%
2/17/2026Freestone Grove Partners LP1,442,836$31.71M0.2%-22.9%2.128%
2/17/2026Schonfeld Strategic Advisors LLC14,590$321K0.0%-89.8%0.022%
2/17/2026PDT Partners LLC110,385$2.43M0.2%-35.2%0.163%
2/17/2026AQR Capital Management LLC339,579$7.46M0.0%-18.2%0.501%
2/17/2026Cetera Investment Advisers10,937$240K0.0%-21.5%0.016%
2/17/2026First Light Asset Management LLC1,089,493$23.95M1.8%N/A1.607%
2/17/2026ArrowMark Colorado Holdings LLC2,889,691$63.52M1.4%-21.7%4.262%
2/17/2026Trexquant Investment LP102,719$2.26M0.0%-79.4%0.151%
2/17/2026Amundi29,445$647K0.0%+167.1%0.043%
2/17/2026Price T Rowe Associates Inc. MD56,809$1.25M0.0%-13.7%0.084%
2/17/2026Adage Capital Partners GP L.L.C.182,995$4.02M0.0%N/A0.270%
2/17/2026California State Teachers Retirement System64,411$1.42M0.0%+6.3%0.095%
2/17/2026Russell Investments Group Ltd.128,660$2.83M0.0%-6.5%0.190%
2/17/2026Maryland State Retirement & Pension System9,855$217K0.0%N/A0.015%
2/17/2026State of Wisconsin Investment Board43,090$947K0.0%-33.4%0.064%
2/17/2026Captrust Financial Advisors13,111$288K0.0%+7.0%0.019%
2/17/2026Royal Bank of Canada208,528$4.58M0.0%-69.4%0.308%
2/17/2026Rice Hall James & Associates LLC62,415$1.37M0.1%-39.1%0.092%
2/16/2026Verition Fund Management LLC10,587$233K0.0%-54.1%0.016%
2/16/2026Panagora Asset Management Inc.146,234$3.21M0.0%-25.1%0.216%
2/16/2026Mariner LLC35,529$781K0.0%+43.2%0.052%
2/13/2026Marshall Wace LLP875,531$19.24M0.0%N/A1.291%
2/13/2026The Manufacturers Life Insurance Company 29,720$653K0.0%-6.0%0.044%
2/13/2026Formula Growth Ltd.70,919$1.56M0.6%-41.9%0.105%
2/13/2026Stifel Financial Corp27,485$604K0.0%-29.6%0.041%
2/13/2026Quarry LP1,437$32K0.0%-61.1%0.002%
2/13/2026Smartleaf Asset Management LLC1,330$30K0.0%+80.5%0.002%
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2/13/2026Jacobs Levy Equity Management Inc.1,653,708$36.35M0.1%+11.6%2.439%
2/13/2026Public Sector Pension Investment Board234,673$5.16M0.0%-11.0%0.346%
2/13/2026Nierenberg Investment Management Company LLC44,555$979K0.5%N/A0.066%
2/13/2026Charles Schwab Investment Management Inc.646,310$14.21M0.0%+15.7%0.953%
2/13/2026State Street Corp2,641,724$58.07M0.0%-1.0%3.896%
2/13/2026Van ECK Associates Corp3,430$75K0.0%+67.4%0.005%
2/13/2026Ieq Capital LLC27,178$597K0.0%N/A0.040%
2/13/2026Caitong International Asset Management Co. Ltd1,321$29K0.1%-40.1%0.002%
2/13/2026UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC164,902$3.63M0.0%-10.8%0.243%
2/13/2026Wells Fargo & Company MN84,411$1.86M0.0%+61.8%0.125%


TNDM Institutional Ownership - Frequently Asked Questions

During the previous two years, 303 institutional investors and hedge funds held shares of Tandem Diabetes Care. The most heavily invested institutionals were Vanguard Group Inc. ($161.36M), Sessa Capital IM L.P. ($85.57M), ArrowMark Colorado Holdings LLC ($63.52M), GW&K Investment Management LLC ($58.80M), State Street Corp ($58.07M), First Light Asset Management LLC ($51.06M), and Hood River Capital Management LLC ($47.81M).Learn more on Tandem Diabetes Care's institutional investors.

Of the 253 institutional investors that purchased Tandem Diabetes Care's stock in the last 24 months, the following investors and hedge funds have bought the highest volume of shares: Sessa Capital IM L.P. ($4.47M), First Light Asset Management LLC ($3.38M), Freestone Grove Partners LP ($2.05M), Hood River Capital Management LLC ($1.53M), Ophir Asset Management Pty Ltd ($1.46M), ArrowMark Colorado Holdings LLC ($1.33M), and Assenagon Asset Management S.A. ($1.33M).

Institutional investors have bought a total of 17,206,345 shares in the last 24 months. This purchase volume represents approximately $303.86M in transactions.

Of the 88 institutional investors that sold Tandem Diabetes Care's stock in the last 24 months, the following investors and hedge funds have sold the highest volume of shares: BNP Paribas Financial Markets ($9.80M), Assenagon Asset Management S.A. ($1.20M), ArrowMark Colorado Holdings LLC ($801.51K), Royal Bank of Canada ($475.05K), Freestone Grove Partners LP ($427.47K), JPMorgan Chase & Co. ($406.37K), and Trexquant Investment LP ($395.00K).

Institutional investors have sold a total of 18,442,505 shares in the last 24 months. This volume of shares sold represents approximately $273.92M in transactions.


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Institutional ownership data for NASDAQ:TNDM is compiled from quarterly 13F filings submitted to the U.S. Securities and Exchange Commission (SEC), with the most recent received on 9/9/2026. New 13F filings are added each quarter as they're published.
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