Tandem Diabetes Care Inc
TNDM- Exchange
- Nasdaq
- Industry
- Surgical & Medical Instruments & Apparatus
- SEC CIK
- 0001438133
No open-market purchases or sales by Tandem Diabetes Care Inc insiders were filed in the last 90 days; 274 institutions reported holding it in 13F filings for Q2 2026, worth $1.19B in total; no superinvestor holds it.
13F holders, Q3 2025
Institutional positions in Tandem Diabetes Care Inc as of Sep 30, 2025. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 255
- −15 vs. Q2 2025
- Shares held
- 75.1M
- −5.90M (−7.3%) vs. Q2 2025
- Total value
- $911.3M
- −$595.7M (−39.5%) vs. Q2 2025
- New holders
- 42
- 76 more added
- Sold out
- 57
- 97 more reduced
1 institution that held it in Q2 2025 haven't filed for Q3 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q2 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting TNDM on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 274 | $1.19B |
| Q1 2026 | 274 | $1.51B |
| Q4 2025 | 269 | $1.65B |
| Q3 2025 | 255 | $911.3M |
| Q2 2025 | 271 | $1.51B |
| Q1 2025 | 275 | $1.40B |
| Q4 2024 | 316 | $2.60B |
| Q3 2024 | 332 | $3.10B |
| Q2 2024 | 317 | $2.96B |
| Q1 2024 | 291 | $2.63B |
| Q4 2023 | 268 | $2.10B |
| Q3 2023 | 226 | $1.45B |
| Q2 2023 | 247 | $1.65B |
| Q1 2023 | 274 | $2.77B |
| Q4 2022 | 295 | $2.89B |
| Q3 2022 | 299 | $3.00B |
| Q2 2022 | 331 | $3.64B |
| Q1 2022 | 379 | $6.92B |
| Q4 2021 | 388 | $9.09B |
| Q3 2021 | 338 | $7.32B |
| Q2 2021 | 303 | $5.75B |
| Q1 2021 | 290 | $5.08B |
Institutions, Q3 2025
Shares, value and share of portfolio for each institution holding Tandem Diabetes Care Inc; share changes are against Q2 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| BlackRock, Inc. | 12,101,471 | $146.9M | 0.00% | +1,229,913+11.3% | Added |
| Vanguard Group Inc | 7,063,314 | $85.7M | 0.00% | −306,516−4.2% | Reduced |
| Sessa Capital IM, L.P. | 5,000,000 | $60.7M | 1.53% | 00.0% | Unchanged |
| ArrowMark Colorado Holdings LLC | 3,691,198 | $44.8M | 0.83% | +991,649+36.7% | Added |
| GW&K Investment Management, LLC | 2,721,649 | $33.0M | 0.29% | −168,481−5.8% | Reduced |
| State Street Corp | 2,668,188 | $32.4M | 0.00% | +22,299+0.8% | Added |
| Hood River Capital Management LLC | 2,551,644 | $31.0M | 0.37% | −13,334−0.5% | Reduced |
| Paradice Investment Management LLC | 2,196,468 | $26.7M | 5.98% | +429,289+24.3% | Added |
| Freestone Grove Partners LP | 1,870,307 | $22.7M | 0.17% | +1,870,307 | New |
| Geode Capital Management, LLC | 1,598,281 | $19.4M | 0.00% | −8,055−0.5% | Reduced |
| UBS Group AG | 1,504,377 | $18.3M | 0.00% | +120,433+8.7% | Added |
| Jacobs Levy Equity Management, Inc | 1,481,953 | $18.0M | 0.07% | +50,646+3.5% | Added |
| Goldman Sachs Group Inc | 1,431,372 | $17.4M | 0.00% | −455,103−24.1% | Reduced |
| Jennison Associates LLC | 1,420,116 | $17.2M | 0.01% | −238,826−14.4% | Reduced |
| Barclays PLC | 1,190,127 | $14.4M | 0.01% | +623,055+109.9% | Added |
| Baillie Gifford & Co | 1,120,595 | $13.6M | 0.01% | −5,133−0.5% | Reduced |
| Two Sigma Investments, LP | 1,117,202 | $13.6M | 0.02% | −115,525−9.4% | Reduced |
| Two Sigma Advisers, LP | 970,883 | $11.8M | 0.02% | +82,800+9.3% | Added |
| Acadian Asset Management LLC | 918,723 | $11.1M | 0.02% | +560,207+156.3% | Added |
| D. E. Shaw & Co., Inc. | 877,217 | $10.6M | 0.01% | +538,549+159.0% | Added |
| FMR LLC | 870,123 | $10.6M | 0.00% | +345,448+65.8% | Added |
| Morgan Stanley | 737,547 | $8.95M | 0.00% | −527,987−41.7% | Reduced |
| Millennium Management LLC | 705,902 | $8.57M | 0.01% | −263,171−27.2% | Reduced |
| Northern Trust Corp | 690,883 | $8.39M | 0.00% | −9,498−1.4% | Reduced |
| Royal Bank of Canada | 681,078 | $8.27M | 0.00% | +131,536+23.9% | Added |
| Bank of America Corp | 658,353 | $7.99M | 0.00% | +112,849+20.7% | Added |
| Connor, Clark & Lunn Investment Management Ltd. | 615,221 | $7.47M | 0.02% | −168,997−21.5% | Reduced |
| Standard Life Aberdeen plc | 598,096 | $7.26M | 0.01% | +241,878+67.9% | Added |
| Charles Schwab Investment Management Inc | 558,453 | $6.78M | 0.00% | −58,547−9.5% | Reduced |
| Royce & Associates LP | 510,000 | $6.19M | 0.06% | +510,000 | New |
| Nuveen, LLC | 502,610 | $6.10M | 0.00% | −125,887−20.0% | Reduced |
| Trexquant Investment LP | 497,720 | $6.04M | 0.06% | +129,190+35.1% | Added |
| Walleye Capital LLC | 463,376 | $5.63M | 0.05% | −103,847−18.3% | Reduced |
| Cubist Systematic Strategies, LLC | 439,158 | $5.33M | 0.08% | +439,158 | New |
| Frontier Capital Management Co LLC | 415,344 | $5.04M | 0.05% | +51,246+14.1% | Added |
| AQR Capital Management LLC | 415,145 | $4.86M | 0.00% | +374,141+912.5% | Added |
| Bank of New York Mellon Corp | 384,134 | $4.66M | 0.00% | −14,869−3.7% | Reduced |
| Brown Capital Management LLC | 363,352 | $4.41M | 0.18% | −187,855−34.1% | Reduced |
| JPMorgan Chase & Co | 359,071 | $4.36M | 0.00% | −203,183−36.1% | Reduced |
| DAFNA Capital Management LLC | 355,208 | $4.31M | 1.07% | +61,000+20.7% | Added |
| Edmond de Rothschild Holding S.A. | 333,200 | $4.05M | 0.06% | +70,600+26.9% | Added |
| Principal Financial Group Inc | 326,701 | $3.97M | 0.00% | −68,525−17.3% | Reduced |
| Invesco Ltd. | 302,041 | $3.67M | 0.00% | +75,252+33.2% | Added |
| Sector Gamma AS | 269,542 | $3.27M | 0.81% | +59,019+28.0% | Added |
| Public Sector Pension Investment Board | 263,564 | $3.20M | 0.01% | +36,460+16.1% | Added |
| Kent Lake PR LLC | 250,000 | $3.04M | 1.55% | +250,000 | New |
| Envestnet Asset Management Inc | 236,332 | $2.87M | 0.00% | −41,678−15.0% | Reduced |
| Algert Global LLC | 226,886 | $2.75M | 0.05% | −304,028−57.3% | Reduced |
| Alliancebernstein L.P. | 223,720 | $2.72M | 0.00% | −46,619−17.2% | Reduced |
| Moore Capital Management, LP | 220,479 | $2.68M | 0.05% | +160,753+269.2% | Added |
| BNP Paribas Arbitrage, SA | 219,615 | $2.67M | 0.00% | −142,263−39.3% | Reduced |
| Jane Street Group, LLC | 217,311 | $2.64M | 0.00% | +127,203+141.2% | Added |
| SEI Investments Co | 215,984 | $2.62M | 0.00% | +29,253+15.7% | Added |
| Susquehanna Portfolio Strategies, LLC | 206,054 | $2.50M | 0.04% | −40,935−16.6% | Reduced |
| Quantinno Capital Management LP | 200,793 | $2.44M | 0.01% | −118,866−37.2% | Reduced |
| Panagora Asset Management Inc | 195,225 | $2.37M | 0.01% | +195,225 | New |
| KBC Group NV | 191,837 | $2.33M | 0.01% | 00.0% | Unchanged |
| Rhumbline Advisers | 190,184 | $2.31M | 0.00% | −3,035−1.6% | Reduced |
| UBS Asset Management Americas Inc | 184,895 | $2.24M | 0.00% | −84,008−31.2% | Reduced |
| Legal & General Group Plc | 182,432 | $2.21M | 0.00% | −2,421−1.3% | Reduced |
| Canada Pension Plan Investment Board | 177,600 | $2.16M | 0.00% | +177,600 | New |
| Susquehanna International Group, LLP | 175,096 | $2.13M | 0.00% | −82,363−32.0% | Reduced |
| Divisadero Street Capital Management, LP | 174,692 | $2.12M | 0.10% | 00.0% | Unchanged |
| Voya Investment Management LLC | 174,146 | $2.11M | 0.00% | +36,397+26.4% | Added |
| Capital Fund Management S.A. | 171,109 | $2.08M | 0.02% | −91,322−34.8% | Reduced |
| PDT Partners, LLC | 170,420 | $2.07M | 0.13% | 00.0% | Unchanged |
| Ameriprise Financial Inc | 168,730 | $2.05M | 0.00% | −250,307−59.7% | Reduced |
| Renaissance Technologies LLC | 161,500 | $1.96M | 0.00% | −180,827−52.8% | Reduced |
| Schonfeld Strategic Advisors LLC | 142,855 | $1.73M | 0.01% | −56,901−28.5% | Reduced |
| Russell Investments Group, Ltd. | 137,672 | $1.67M | 0.00% | −61,041−30.7% | Reduced |
| Raymond James Financial Inc | 136,926 | $1.66M | 0.00% | −6,348−4.4% | Reduced |
| Swiss National Bank | 129,100 | $1.57M | 0.00% | +1,800+1.4% | Added |
| Brevan Howard Capital Management LP | 126,888 | $1.54M | 0.02% | +32,154+33.9% | Added |
| Formula Growth Ltd | 122,096 | $1.48M | 0.53% | 00.0% | Unchanged |
| Jump Financial, LLC | 118,444 | $1.44M | 0.02% | −44,506−27.3% | Reduced |
| Mizuho Markets Americas LLC | 117,362 | $1.42M | 0.03% | −21,380−15.4% | Reduced |
| Truist Financial Corp | 115,576 | $1.40M | 0.00% | −7,955−6.4% | Reduced |
| Rice Hall James & Associates, LLC | 102,569 | $1.25M | 0.07% | −1,385−1.3% | Reduced |
| Summit Trail Advisors, LLC | 101,310 | $1.23M | 0.02% | +76,430+307.2% | Added |
| Gsa Capital Partners LLP | 98,941 | $1.20M | 0.10% | +98,941 | New |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 98,310 | $1.19M | 0.00% | −3,036−3.0% | Reduced |
| HSBC Holdings PLC | 92,926 | $1.08M | 0.00% | +63,184+212.4% | Added |
| HRT Financial LP | 88,761 | $1.08M | 0.00% | +88,761 | New |
| Group One Trading, L.P. | 84,771 | $1.03M | 0.03% | +28,831+51.5% | Added |
| Cerity Partners LLC | 76,299 | $926.3K | 0.00% | −5,963−7.2% | Reduced |
| Dark Forest Capital Management LP | 75,535 | $917.0K | 0.03% | +14,533+23.8% | Added |
| Banque Pictet & Cie SA | 74,982 | $910.3K | 0.01% | −9,046−10.8% | Reduced |
| XTX Topco Ltd | 73,545 | $892.8K | 0.05% | +54,752+291.3% | Added |
| Intech Investment Management LLC | 73,493 | $892.2K | 0.01% | +26,150+55.2% | Added |
| Prudential Financial Inc | 69,434 | $842.9K | 0.00% | −313,370−81.9% | Reduced |
| New York State Teachers Retirement System | 68,300 | $829.0K | 0.00% | 00.0% | Unchanged |
| Price T Rowe Associates Inc | 65,803 | $799.0K | 0.00% | +6,600+11.1% | Added |
| State of Wisconsin Investment Board | 64,681 | $785.2K | 0.00% | −95,938−59.7% | Reduced |
| SG Americas Securities, LLC | 63,051 | $765.0K | 0.00% | +35,291+127.1% | Added |
| Mirae Asset Global ETFs Holdings Ltd. | 62,698 | $761.2K | 0.00% | −940−1.5% | Reduced |
| California State Teachers Retirement System | 60,601 | $735.7K | 0.00% | +30.0% | Added |
| Y-Intercept (Hong Kong) Ltd | 56,925 | $691.1K | 0.02% | +56,925 | New |
| Natixis Advisors, L.P. | 56,404 | $685.0K | 0.00% | +13,992+33.0% | Added |
| Deutsche Bank AG | 54,766 | $664.9K | 0.00% | +6,393+13.2% | Added |
| Great West Life Assurance Co | 56,332 | $664.0K | 0.00% | 00.0% | Unchanged |