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
Total Exit/New Position Q2 2025 → Q3 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 39 | $49.5M |
| Exits | 57 | $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 |
"% of holder's portfolio" is TNDM's weight in each manager's 13F, not the share of Tandem Diabetes Care Inc. the manager owns.