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Tandem Diabetes Care (TNDM) Institutional Ownership

Tandem Diabetes Care logo
$17.11 -1.20 (-6.55%)
Closing price 09/11/2026 04:00 PM Eastern
Extended Trading
$17.17 +0.06 (+0.34%)
As of 09/11/2026 07:50 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)
113
Total
Institutional Inflows
(last 12 months)
$320.33M
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
9/9/2026 First Light Asset Management LLC3,383,553$51.06M3.1%+157.4%4.863%
9/9/2026 Engineers Gate Manager LP64,662$976K0.0%N/A0.093%
9/9/2026 Integrated Wealth Concepts LLC2,189$33K0.0%N/A0.003%
9/9/2026 Squarepoint Ops LLC217,386$3.28M0.0%N/A0.312%
8/27/2026 Corient Private Wealth LP16,589$250K0.0%-50.8%0.024%
8/25/2026 VIRGINIA RETIREMENT SYSTEMS ET Al26,200$395K0.0%N/A0.038%
8/24/2026 California State Teachers Retirement System1,165,355$17.59M0.0%+1,283.1%1.675%
8/20/2026 Proficio Capital Partners LLC11,897$180K0.0%N/A0.017%
8/20/2026 Beaconlight Capital LLC266,009$4.01M1.4%+4.8%0.382%
8/19/2026 Prosperitas Financial LLC10,000$151K0.0%N/A0.014%
8/19/2026 Wellington Management Group LLP871,811$13.16M0.0%-16.4%1.253%
7/10/2026 Redhawk Wealth Advisors Inc.13,731$207K0.0%N/A0.020%
7/8/2026 Assenagon Asset Management S.A.26,430$399K0.0%-85.2%0.039%
7/7/2026 180 Wealth Advisors LLC24,934$376K0.0%+58.2%0.036%
7/7/2026 GAMMA Investing LLC1,644$25K0.0%-53.1%0.002%
6/12/2026 Defilade Capital Management L.P.761,905$14.61M2.1%N/A1.112%
5/19/2026 Bank of America Corp DE373,224$7.16M0.0%-46.9%0.545%
5/18/2026 Amundi12,615$242K0.0%-57.2%0.018%
5/18/2026 California State Teachers Retirement System84,255$1.62M0.0%+30.8%0.123%
5/18/2026 Royal Bank of Canada206,033$3.95M0.0%-1.2%0.301%
5/16/2026 The Manufacturers Life Insurance Company28,722$551K0.0%-3.4%0.042%
5/16/2026 Quantinno Capital Management LP653,870$12.54M0.0%+123.5%0.954%
5/16/2026 First Light Asset Management LLC1,314,715$25.20M2.3%+20.7%1.918%
5/15/2026 Rice Hall James & Associates LLC72,878$1.40M0.1%+16.8%0.106%
5/14/2026 Renaissance Technologies LLC58,227$1.12M0.0%N/A0.085%
5/14/2026 Gabelli Funds LLC25,000$479K0.0%N/A0.036%
5/14/2026 Beaconlight Capital LLC253,877$4.87M2.6%N/A0.370%
5/14/2026 Arrowstreet Capital Limited Partnership193,556$3.71M0.0%+42.6%0.282%
5/14/2026 Mizuho Markets Americas LLC157,362$3.02M0.1%+8.8%0.230%
5/14/2026 Sei Investments Co.95,306$1.83M0.0%-10.6%0.139%
5/14/2026 State of Wyoming17,964$344K0.0%-43.5%0.026%
5/13/2026 First Trust Advisors LP342,707$6.57M0.0%N/A0.500%
5/8/2026 PNC Financial Services Group Inc.20,817$399K0.0%-6.8%0.030%
5/6/2026 Jennison Associates LLC1,658,448$31.79M0.0%-18.0%2.421%
5/5/2026 Bank of New York Mellon Corp336,291$6.45M0.0%-3.8%0.491%
5/4/2026 Principal Financial Group Inc.331,541$6.36M0.0%+2.2%0.484%
5/1/2026 180 Wealth Advisors LLC15,763$302K0.0%+17.3%0.023%
5/1/2026 Fifth Third Bancorp22,605$433K0.0%+2,075.6%0.033%
4/30/2026 Greenwood Capital Associates LLC13,941$267K0.0%-9.2%0.020%
4/27/2026 Counterpoint Mutual Funds LLC12,679$243K0.0%-44.5%0.019%
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4/27/2026 New York State Teachers Retirement System66,096$1.27M0.0%-3.2%0.096%
4/27/2026 Y Intercept Hong Kong Ltd77,879$1.49M0.0%-7.3%0.114%
4/27/2026 Leonteq Securities AG9,501$182K0.0%+21.7%0.014%
4/23/2026 Inspire Investing LLC27,010$518K0.0%+28.2%0.039%
4/22/2026 Pictet Asset Management Holding SA10,764$206K0.0%N/A0.016%
4/21/2026 Louisiana State Employees Retirement System30,100$577K0.0%N/A0.044%
4/20/2026 OP Asset Management Ltd1,835$35K0.0%N/A0.003%
4/20/2026 Assenagon Asset Management S.A.178,640$3.43M0.0%-85.5%0.261%
4/16/2026 SG Americas Securities LLC33,022$633K0.0%-46.7%0.048%
4/16/2026 Diversified Trust Co21,332$409K0.0%+9.1%0.031%
3/20/2026 Hsbc Holdings PLC36,553$810K0.0%-60.7%0.053%
3/9/2026 Corient Private Wealth LLC19,535$429K0.0%N/A0.029%
2/19/2026 Invesco Ltd.277,722$6.10M0.0%-8.1%0.410%
2/19/2026 Corient Private Wealth LLC15,748$346K0.0%N/A0.023%
2/18/2026 Mercer Global Advisors Inc. ADV11,294$248K0.0%N/A0.017%
2/18/2026 State of Tennessee Department of Treasury21,514$473K0.0%-33.4%0.032%
2/18/2026 EP Wealth Advisors LLC9,977$219K0.0%N/A0.015%
2/18/2026 Wellington Management Group LLP98,309$2.16M0.0%N/A0.145%
2/18/2026 Susquehanna Portfolio Strategies LLC66,452$1.46M0.0%-67.8%0.098%
2/18/2026 Millennium Management LLC583,573$12.83M0.0%-17.3%0.861%
2/18/2026 Man Group plc12,782$281K0.0%N/A0.019%
2/18/2026 Inspire Investing LLC21,066$463K0.0%-45.2%0.031%
2/18/2026 Engineers Gate Manager LP88,547$1.95M0.0%N/A0.131%
2/18/2026 Balyasny Asset Management L.P.262,788$5.78M0.0%N/A0.388%
2/17/2026 Freestone Grove Partners LP1,442,836$31.71M0.2%-22.9%2.128%
2/17/2026 Schonfeld Strategic Advisors LLC14,590$321K0.0%-89.8%0.022%
2/17/2026 PDT Partners LLC110,385$2.43M0.2%-35.2%0.163%
2/17/2026 AQR Capital Management LLC339,579$7.46M0.0%-18.2%0.501%
2/17/2026 Cetera Investment Advisers10,937$240K0.0%-21.5%0.016%
2/17/2026 First Light Asset Management LLC1,089,493$23.95M1.8%N/A1.607%
2/17/2026 ArrowMark Colorado Holdings LLC2,889,691$63.52M1.4%-21.7%4.262%
2/17/2026 Trexquant Investment LP102,719$2.26M0.0%-79.4%0.151%
2/17/2026 Amundi29,445$647K0.0%+167.1%0.043%
2/17/2026 Price T Rowe Associates Inc. MD56,809$1.25M0.0%-13.7%0.084%
2/17/2026 Adage Capital Partners GP L.L.C.182,995$4.02M0.0%N/A0.270%
2/17/2026 California State Teachers Retirement System64,411$1.42M0.0%+6.3%0.095%
2/17/2026 Russell Investments Group Ltd.128,660$2.83M0.0%-6.5%0.190%
2/17/2026 Maryland State Retirement & Pension System9,855$217K0.0%N/A0.015%
2/17/2026 State of Wisconsin Investment Board43,090$947K0.0%-33.4%0.064%
2/17/2026 Captrust Financial Advisors13,111$288K0.0%+7.0%0.019%
2/17/2026 Royal Bank of Canada208,528$4.58M0.0%-69.4%0.308%
2/17/2026 Rice Hall James & Associates LLC62,415$1.37M0.1%-39.1%0.092%
2/16/2026 Verition Fund Management LLC10,587$233K0.0%-54.1%0.016%
2/16/2026 Panagora Asset Management Inc.146,234$3.21M0.0%-25.1%0.216%
2/16/2026 Mariner LLC35,529$781K0.0%+43.2%0.052%
2/13/2026 Marshall Wace LLP875,531$19.24M0.0%N/A1.291%
2/13/2026 The Manufacturers Life Insurance Company 29,720$653K0.0%-6.0%0.044%
2/13/2026 Formula Growth Ltd.70,919$1.56M0.6%-41.9%0.105%
2/13/2026 Stifel Financial Corp27,485$604K0.0%-29.6%0.041%
2/13/2026 Quarry LP1,437$32K0.0%-61.1%0.002%
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2/13/2026 Smartleaf Asset Management LLC1,330$30K0.0%+80.5%0.002%
2/13/2026 Jacobs Levy Equity Management Inc.1,653,708$36.35M0.1%+11.6%2.439%
2/13/2026 Public Sector Pension Investment Board234,673$5.16M0.0%-11.0%0.346%
2/13/2026 Nierenberg Investment Management Company LLC44,555$979K0.5%N/A0.066%
2/13/2026 Charles Schwab Investment Management Inc.646,310$14.21M0.0%+15.7%0.953%
2/13/2026 State Street Corp2,641,724$58.07M0.0%-1.0%3.896%
2/13/2026 Van ECK Associates Corp3,430$75K0.0%+67.4%0.005%
2/13/2026 Ieq Capital LLC27,178$597K0.0%N/A0.040%
2/13/2026 Caitong International Asset Management Co. Ltd1,321$29K0.1%-40.1%0.002%
2/13/2026 UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC164,902$3.63M0.0%-10.8%0.243%


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 18,299,821 shares in the last 24 months. This purchase volume represents approximately $320.33M 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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