Tandem Diabetes CareTNDM

13F holders, Q3 2025 (September 30)
255holders −15
39new positions
57sold out
5famous investors
$12.14avg. 13F price*

At the end of Q3 2025, 255 institutions reported holding Tandem Diabetes Care Inc. (TNDM) in their 13F filings, down 15 from Q2 2025. 39 opened new positions and 57 sold out. The largest holders were BlackRock, Inc. ($146.9M), Vanguard Group Inc. ($85.7M) and Sessa Capital IM, L.P. ($60.7M). 5 famous investors held it, including David E. Shaw (0.0% of D. E. Shaw & Co.'s portfolio), Israel Englander (0.0% of Millennium Management's portfolio) and Cliff Asness (0.0% of AQR Capital Management's portfolio).

Company
Tandem Diabetes Care Inc.
CUSIP
875372203
Latest filing quarter
Q2 2026

History

Number of 13F holders

0100200300400 Q1 2024: 291Q1 2024Q2 2024: 316Q2 2024Q3 2024: 331Q3 2024Q4 2024: 315Q4 2024Q1 2025: 275Q1 2025Q2 2025: 270Q2 2025Q3 2025: 255Q3 2025Q4 2025: 269Q4 2025Q1 2026: 274Q1 2026Q2 2026: 274Q2 2026

Total Exit/New Position Q2 2025 → Q3 2025

InstitutionsTotal Value
New Positions39$49.5M
Exits57$202.2M

All 13F filers, Q2 2025 → Q3 2025: 11,241,119 shares bought and 17,182,226 shares sold, net −5,941,107 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.

Ownership 255 holders

BlackRock, Inc. 0.00% Add +11.3% 12,101,471 $146.9M
Vanguard Group Inc. 0.00% Reduce -4.2% 7,063,314 $85.7M
Sessa Capital IM, L.P. 1.53% No change 5,000,000 $60.7M
ArrowMark Colorado Holdings LLC 0.83% Add +36.7% 3,691,198 $44.8M
GW&K Investment Management, LLC 0.29% Reduce -5.8% 2,721,649 $33.0M
State Street Corp. 0.00% Add +0.8% 2,668,188 $32.4M
Hood River Capital Management LLC 0.37% Reduce -0.5% 2,551,644 $31.0M
Paradice Investment Management LLC 5.98% Add +24.3% 2,196,468 $26.7M
Freestone Grove Partners LP 0.17% New 1,870,307 $22.7M
Geode Capital Management, LLC 0.00% Reduce -0.5% 1,598,281 $19.4M
UBS Group AG 0.00% Add +8.7% 1,504,377 $18.3M
Jacobs Levy Equity Management, Inc. 0.07% Add +3.5% 1,481,953 $18.0M
Goldman Sachs Group Inc. 0.00% Reduce -24.1% 1,431,372 $17.4M
Jennison Associates LLC 0.01% Reduce -14.4% 1,420,116 $17.2M
Barclays PLC 0.01% Add +109.9% 1,190,127 $14.4M
Baillie Gifford & Co. 0.01% Reduce -0.5% 1,120,595 $13.6M
Two Sigma Investments, LP 0.02% Reduce -9.4% 1,117,202 $13.6M
Two Sigma Advisers, LP 0.02% Add +9.3% 970,883 $11.8M
Acadian Asset Management LLC 0.02% Add +156.3% 918,723 $11.1M
D. E. Shaw & Co. 0.01% Add +159.0% 877,217 $10.6M
FMR LLC 0.00% Add +65.8% 870,123 $10.6M
Morgan Stanley 0.00% Reduce -41.7% 737,547 $9.0M
Millennium Management 0.01% Reduce -27.2% 705,902 $8.6M
Northern Trust Corp. 0.00% Reduce -1.4% 690,883 $8.4M
Royal Bank of Canada 0.00% Add +23.9% 681,078 $8.3M
Bank of America Corp. 0.00% Add +20.7% 658,353 $8.0M
Connor, Clark & Lunn Investment Management Ltd. 0.02% Reduce -21.6% 615,221 $7.5M
Aberdeen Group plc 0.01% Add +67.9% 598,096 $7.3M
Charles Schwab Investment Management Inc. 0.00% Reduce -9.5% 558,453 $6.8M
Royce & Associates LP 0.06% New 510,000 $6.2M
Nuveen, LLC 0.00% Reduce -20.0% 502,610 $6.1M
Trexquant Investment LP 0.06% Add +35.1% 497,720 $6.0M
Walleye Capital LLC 0.05% Reduce -18.3% 463,376 $5.6M
Cubist Systematic Strategies, LLC 0.08% New 439,158 $5.3M
Frontier Capital Management Co. LLC 0.05% Add +14.1% 415,344 $5.0M
AQR Capital Management 0.00% Add +912.5% 415,145 $4.9M
Bank of New York Mellon Corp 0.00% Reduce -3.7% 384,134 $4.7M
Brown Capital Management LLC 0.18% Reduce -34.1% 363,352 $4.4M
JPMorgan Chase & Co. 0.00% Reduce -36.1% 359,071 $4.4M
DAFNA Capital Management LLC 1.08% Add +20.7% 355,208 $4.3M
Edmond DE Rothschild Holding S.A. 0.06% Add +26.9% 333,200 $4.0M
Principal Financial Group Inc. 0.00% Reduce -17.3% 326,701 $4.0M
Invesco Ltd. 0.00% Add +33.2% 302,041 $3.7M
Sector Gamma As 0.81% Add +28.0% 269,542 $3.3M
Public Sector Pension Investment Board 0.01% Add +16.1% 263,564 $3.2M
Kent Lake PR LLC 1.55% New 250,000 $3.0M
Envestnet Asset Management Inc. 0.00% Reduce -15.0% 236,332 $2.9M
Algert Global LLC 0.05% Reduce -57.3% 226,886 $2.8M
Alliancebernstein L.P. 0.00% Reduce -17.2% 223,720 $2.7M
Moore Capital Management, LP 0.05% Add +269.1% 220,479 $2.7M
BNP Paribas Financial Markets 0.00% Reduce -39.3% 219,615 $2.7M
Jane Street Group, LLC 0.00% Add +141.2% 217,311 $2.6M
Sei Investments Co. 0.00% Add +15.7% 215,984 $2.6M
Susquehanna Portfolio Strategies, LLC 0.04% Reduce -16.6% 206,054 $2.5M
Quantinno Capital Management LP 0.01% Reduce -37.2% 200,793 $2.4M
Panagora Asset Management Inc. 0.01% New 195,225 $2.4M
KBC Group NV 0.01% No change 191,837 $2.3M
Rhumbline Advisers 0.00% Reduce -1.6% 190,184 $2.3M
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% Reduce -31.2% 184,895 $2.2M
Legal & General Group Plc 0.00% Reduce -1.3% 182,432 $2.2M
Canada Pension Plan Investment Board 0.00% New 177,600 $2.2M
Susquehanna International Group, LLP 0.00% Reduce -32.0% 175,096 $2.1M
Divisadero Street Capital Management, LP 0.10% No change 174,692 $2.1M
Voya Investment Management LLC 0.00% Add +26.4% 174,146 $2.1M
Capital Fund Management S.A. 0.02% Reduce -34.8% 171,109 $2.1M
PDT Partners, LLC 0.13% No change 170,420 $2.1M
Ameriprise Financial Inc. 0.00% Reduce -59.7% 168,730 $2.0M
Renaissance Technologies 0.00% Reduce -52.8% 161,500 $2.0M
Schonfeld Strategic Advisors LLC 0.01% Reduce -28.5% 142,855 $1.7M
Russell Investments Group, Ltd. 0.00% Reduce -30.7% 137,672 $1.7M
Raymond James Financial Inc. 0.00% Reduce -4.4% 136,926 $1.7M
Swiss National Bank 0.00% Add +1.4% 129,100 $1.6M
Brevan Howard Capital Management LP 0.02% Add +33.9% 126,888 $1.5M
Formula Growth Ltd. 0.53% No change 122,096 $1.5M
Jump Financial, LLC 0.02% Reduce -27.3% 118,444 $1.4M
Mizuho Markets Americas LLC 0.03% Reduce -15.4% 117,362 $1.4M
Truist Financial Corp. 0.00% Reduce -6.4% 115,576 $1.4M
Rice Hall James & Associates, LLC 0.07% Reduce -1.3% 102,569 $1.2M
Summit Trail Advisors, LLC 0.02% Add +307.2% 101,310 $1.2M
Gsa Capital Partners LLP 0.10% New 98,941 $1.2M
Universal- Beteiligungs- und Servicegesellschaft mbH 0.00% Reduce -3.0% 98,310 $1.2M
HSBC Holdings PLC 0.00% Add +212.4% 92,926 $1.1M
HRT Financial LP 0.00% New 88,761 $1.1M
Group One Trading LLC 0.03% Add +51.5% 84,771 $1.0M
Cerity Partners LLC 0.00% Reduce -7.3% 76,299 $926K
Dark Forest Capital Management LP 0.03% Add +23.8% 75,535 $917K
Banque Pictet & Cie SA 0.01% Reduce -10.8% 74,982 $910K
XTX Topco Ltd 0.05% Add +291.3% 73,545 $893K
Intech Investment Management LLC 0.01% Add +55.2% 73,493 $892K
Prudential Financial Inc. 0.00% Reduce -81.9% 69,434 $843K
New York State Teachers Retirement System 0.00% No change 68,300 $829K
T. Rowe Price Associates Inc. 0.00% Add +11.2% 65,803 $799K
State of Wisconsin Investment Board 0.00% Reduce -59.7% 64,681 $785K
SG Americas Securities, LLC 0.00% Add +127.1% 63,051 $765K
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. 0.00% Reduce -1.5% 62,698 $761K
California State Teachers Retirement System 0.00% Add +0.0% 60,601 $736K
Y-Intercept (Hong Kong) Ltd 0.02% New 56,925 $691K
Natixis Advisors, LLC 0.00% Add +33.0% 56,404 $685K
Deutsche Bank AG 0.00% Add +13.2% 54,766 $665K
CANADA LIFE ASSURANCE Co 0.00% No change 56,332 $664K
Wells Fargo & Company 0.00% Add +3.8% 52,174 $633K
Thrivent Financial for Lutherans 0.00% Reduce -0.5% 48,746 $592K
Caprock Group, LLC 0.01% — 44,359 $555K
Orion Porfolio Solutions, LLC 0.00% Reduce -1.4% 43,982 $534K
Counterpoint Mutual Funds LLC 0.04% New 42,265 $513K
Bryce Point Capital, LLC 0.63% New 42,258 $513K
Oppenheimer Asset Management Inc. 0.01% Reduce -23.2% 41,495 $504K
Franklin Resources Inc. 0.00% Add +51.3% 40,772 $495K
First Trust Advisors LP 0.00% New 40,730 $494K
Citadel Advisors 0.00% Reduce -88.7% 39,801 $483K
MetLife Investment Management, LLC 0.00% No change 39,091 $475K
Stifel Financial Corp. 0.00% Add +9.8% 39,014 $474K
LPL Financial LLC 0.00% Add +3.8% 38,874 $472K
Inspire Investing, LLC 0.05% Add +84.3% 38,419 $466K
State of Alaska, Department of Revenue 0.00% Reduce -3.8% 38,153 $462K
VIRGINIA RETIREMENT SYSTEMS ET Al 0.00% Add +0.3% 37,000 $449K
Bank of Montreal 0.00% Reduce -83.5% 34,793 $422K
Quantbot Technologies LP 0.01% Add +0.3% 33,536 $407K
American Century Companies Inc. 0.00% New 32,749 $398K
State of Tennessee, Department of Treasury 0.00% Reduce -10.8% 32,298 $392K
Manufacturers Life Insurance Company, The 0.00% Reduce -4.8% 31,610 $384K
Louisiana State Employees Retirement System 0.01% No change 31,100 $378K
Janus Henderson Group PLC 0.00% No change 29,811 $362K
Citigroup Inc. 0.00% Reduce -66.9% 28,823 $350K
Quadrature Capital Ltd 0.00% New 26,756 $325K
Versor Investments LP 0.06% New 26,200 $318K
Comerica Bank 0.00% Reduce -13.6% 25,549 $310K
Mariner, LLC 0.00% Add +39.8% 24,803 $301K
Advisors Asset Management, Inc. 0.01% Reduce -2.8% 24,312 $295K
HighMark Wealth Management LLC 0.13% Reduce -0.4% 23,570 $286K
Verition Fund Management LLC 0.00% Reduce -89.5% 23,066 $280K
AlphaQuest LLC 0.02% Add +31.9% 22,910 $278K
PharVision Advisers, LLC 0.15% New 22,268 $270K
Handelsbanken Fonder AB 0.00% No change 22,000 $267K
Cwm, LLC 0.00% Add +686.2% 21,983 $267K
Zurcher Kantonalbank (Zurich Cantonalbank) 0.00% No change 21,449 $260K
Yousif Capital Management, LLC 0.00% Reduce -15.2% 21,327 $259K
PNC Financial Services Group, Inc. 0.00% Add +1.0% 21,155 $257K
New York State Common Retirement Fund 0.00% Reduce -89.9% 19,948 $242K
Arizona State Retirement System 0.00% Add +1.5% 19,693 $239K
Amalgamated Bank 0.00% Add +3.5% 19,617 $238K
Bayforest Capital Ltd 0.11% Add +108.1% 19,295 $234K
Teachers Retirement System of the State of Kentucky 0.00% Reduce -10.7% 19,003 $231K
Prelude Capital Management, LLC 0.02% New 18,754 $228K
State Board of Administration of Florida Retirement System 0.00% No change 18,552 $225K
Police & Firemen's Retirement System of New Jersey 0.00% Add +21.0% 18,505 $225K
Diversified Trust Co. 0.00% Add +12.2% 18,339 $223K
Wealth Enhancement Advisory Services, LLC 0.00% New 15,082 $219K
MN Wealth Advisors, LLC 0.11% New 17,430 $212K
Commonwealth of Pennsylvania Public School Empls Retrmt SYS 0.00% Add +0.6% 17,208 $209K
Ensign Peak Advisors, Inc 0.00% Reduce -31.2% 17,182 $209K
OP Asset Management Ltd 0.00% No change 17,114 $208K
Commerce Bank 0.00% Reduce -62.9% 16,757 $203K
Olympiad Research LP 0.28% New 16,623 $202K
Oregon Public Employees Retirement Fund 0.00% No change 15,271 $185K
Neuberger Berman Group LLC 0.00% Reduce -12.4% 15,101 $183K
State of Wyoming 0.02% Reduce -29.8% 15,043 $183K
Cetera Investment Advisers 0.00% Reduce -5.4% 13,929 $169K
Amundi 0.00% No change 11,022 $165K
Atom Investors LP 0.01% New 13,521 $164K
KLP Kapitalforvaltning As 0.00% No change 13,500 $164K
ProShare Advisors LLC 0.00% Reduce -15.5% 12,606 $153K
Praxis Investment Management Inc. 0.01% New 12,376 $150K
Captrust Financial Advisors 0.00% Reduce -50.5% 12,251 $149K
Deerfield Management Company, L.P. 0.00% New 12,195 $148K
IQ EQ FUND MANAGEMENT (IRELAND) Ltd 0.01% No change 11,851 $144K
Apollon Wealth Management, LLC 0.00% Reduce -1.0% 11,257 $137K
Leonteq Securities AG 0.01% Add +87.4% 11,042 $134K
Guggenheim Capital LLC 0.00% New 10,692 $130K
180 Wealth Advisors, LLC 0.02% New 10,396 $126K
Creative Planning 0.00% New 10,290 $125K
Osaic Holdings, Inc. 0.00% Reduce -8.5% 8,487 $106K
Advisory Services Network, LLC 0.00% Reduce -27.8% 8,274 $100K
China Universal Asset Management Co., Ltd. 0.01% New 8,000 $97K
Public Employees Retirement Association of Colorado 0.00% No change 7,650 $93K
Arax Advisory Partners 0.00% Add +1402.3% 7,151 $87K
Walleye Trading LLC 0.00% Add +15.9% 7,118 $86K
Ameritas Investment Partners, Inc. 0.00% Reduce -18.7% 5,586 $68K
Aster Capital Management (DIFC) Ltd 0.03% Add +485.1% 5,149 $63K
CoreCap Advisors, LLC 0.00% Add +270.3% 4,751 $58K
Shell Asset Management Co. 0.00% Reduce -83.0% 3,878 $47K
Quarry LP 0.01% Add +2597.1% 3,695 $45K
Simplex Trading, LLC 0.00% Reduce -65.9% 3,558 $43K
Essential Partners LLC 0.01% New 2,862 $35K
Farther Finance Advisors, LLC 0.00% Reduce -0.1% 2,635 $32K
Stonehage Fleming Financial Services Holdings Ltd 0.00% No change 2,551 $31K
Creative Financial Designs Inc. 0.00% No change 2,522 $31K
US Bancorp \de 0.00% Reduce -93.3% 2,355 $29K
Caitong International Asset Management Co., Ltd 0.02% Add +200.0% 2,205 $27K
Van Eck Associates Corp. 0.00% Reduce -68.7% 2,049 $25K
Tower Research Capital LLC (TRC) 0.00% Reduce -78.1% 2,010 $24K
Assetmark, Inc. 0.00% No change 1,750 $21K
AdvisorNet Financial, Inc 0.00% Reduce -2.3% 1,680 $20K
McIlrath & Eck, LLC 0.00% No change 1,605 $19K
Point72 Europe (London) LLP 0.00% New 1,573 $19K
Cornerstone Planning Group LLC 0.00% New 123 $19K
Jones Financial Companies LLLP 0.00% Reduce -7.1% 1,311 $16K
First Horizon Corp. 0.00% — 1,194 $14K
Quadrant Capital Group LLC 0.00% New 1,132 $14K
GAMMA Investing LLC 0.00% Reduce -31.3% 1,113 $14K
Salem Investment Counselors Inc. 0.00% No change 1,000 $12K
Point72 Asia (Singapore) Pte. Ltd. 0.00% New 1,000 $12K
Nisa Investment Advisors, LLC 0.00% Reduce -78.5% 895 $11K
Fifth Third Bancorp 0.00% Add +121.8% 894 $11K
BNP PARIBAS ASSET MANAGEMENT Holding S.A. 0.00% Add +7.6% 708 $9K
Salomon & Ludwin, LLC 0.00% New 604 $9K
Smartleaf Asset Management LLC 0.00% Reduce -41.0% 737 $9K
Covestor Ltd 0.00% Add +140.0% 696 $8K
Clearstead Advisors, LLC 0.00% Add +882.1% 658 $8K
Global Retirement Partners, LLC 0.00% Reduce -6.5% 600 $7K
EverSource Wealth Advisors, LLC 0.00% Add +242.6% 579 $7K
Quent Capital, LLC 0.00% New 517 $6K
Optiver Holding B.V. 0.00% New 460 $6K
Rockefeller Capital Management L.P. 0.00% New 402 $5K
Transamerica Financial Advisors, LLC 0.00% New 389 $5K
Principal Securities, Inc. 0.00% Reduce -12.6% 381 $5K
Wealthspire Advisors, LLC 0.00% New 330 $4K
Versant Capital Management, Inc 0.00% Reduce -84.0% 328 $4K
NFSG Corp 0.00% No change 320 $4K
Northwestern Mutual Wealth Management Co. 0.00% Add +956.7% 317 $4K
Allworth Financial LP 0.00% Add +1003.9% 287 $3K
Banque Cantonale Vaudoise 0.00% No change 237 $3K
Signaturefd, LLC 0.00% Reduce -69.9% 232 $3K
Harbour Investments, Inc. 0.00% No change 204 $2K
Mather Group, Llc. 0.00% New 175 $2K
Sterling Capital Management LLC 0.00% Add +0.6% 162 $2K
MAI Capital Management 0.00% Reduce -84.2% 114 $1K
Front Row Advisors LLC 0.00% No change 100 $1K
Toth Financial Advisory Corp. 0.00% No change 100 $1K
NewEdge Advisors, LLC 0.00% Reduce -77.9% 100 $1K
Larson Financial Group LLC 0.00% Add +222.6% 100 $1K
Bessemer Group Inc. 0.00% Reduce -99.7% 85 $1K
Federation des caisses Desjardins du Quebec 0.00% No change 75 $911
Prestige Wealth Management Group LLC 0.00% No change 65 $790
IFP Advisors, Inc 0.00% Add +0.0% 65 $789
Farmers & Merchants Investments Inc. 0.00% No change 50 $607
Ameritas Advisory Services, LLC 0.00% No change 50 $607
True Wealth Design, LLC 0.00% Reduce -37.1% 44 $535
Bare Financial Services, Inc 0.00% Add +82.6% 42 $510
Golden State Wealth Management, LLC 0.00% No change 41 $498
Eastern Bank 0.00% No change 32 $388
Rothschild Investment LLC 0.00% Reduce -80.0% 25 $304
SBI Securities Co., Ltd. 0.00% Add +38.9% 25 $304
Parkside Financial Bank & Trust 0.00% Add +60.0% 24 $292
UMB Bank, n.a. 0.00% Reduce -92.7% 24 $291
Parallel Advisors, LLC 0.00% Reduce -96.1% 23 $279
JFS Wealth Advisors, LLC 0.00% No change 15 $183
Clearstead Trust, LLC 0.00% No change 13 $158
Evermay Wealth Management LLC 0.00% No change 9 $110
CIBC Private Wealth Group LLC 0.00% No change 6 $73
Abound Wealth Management 0.00% No change 6 $73
Bell Investment Advisors, Inc 0.00% Reduce -88.9% 4 $49
Abich Financial Wealth Management LLC 0.00% — 2 $24
Huntington National Bank 0.00% Reduce -95.7% 1 $12
Hantz Financial Services, Inc. 0.00% Reduce -5.0% 38 $0

"% of holder's portfolio" is TNDM's weight in each manager's 13F, not the share of Tandem Diabetes Care Inc. the manager owns.