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, Q4 2025
Institutional positions in Tandem Diabetes Care Inc as of Dec 31, 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
- 269
- +21 vs. Q3 2025
- Shares held
- 74.9M
- +524.4K (+0.7%) vs. Q3 2025
- Total value
- $1.65B
- +$743.2M (+82.4%) vs. Q3 2025
- New holders
- 53
- 85 more added
- Sold out
- 32
- 99 more reduced
7 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q3 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, Q4 2025
Shares, value and share of portfolio for each institution holding Tandem Diabetes Care Inc; share changes are against Q3 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| BlackRock, Inc. | 11,149,181 | $245.1M | 0.00% | −952,290−7.9% | Reduced |
| Vanguard Group Inc | 7,341,356 | $161.4M | 0.00% | +278,042+3.9% | Added |
| Sessa Capital IM, L.P. | 5,000,000 | $109.9M | 2.18% | 00.0% | Unchanged |
| ArrowMark Colorado Holdings LLC | 2,889,691 | $63.5M | 1.40% | −801,507−21.7% | Reduced |
| GW&K Investment Management, LLC | 2,675,157 | $58.8M | 0.51% | −46,492−1.7% | Reduced |
| State Street Corp | 2,641,724 | $58.1M | 0.00% | −26,464−1.0% | Reduced |
| Citadel Advisors LLC | 2,088,603 | $45.9M | 0.03% | +2,048,802+5,147.6% | Added |
| Morgan Stanley | 2,080,497 | $45.7M | 0.00% | +1,342,950+182.1% | Added |
| Paradice Investment Management LLC | 2,077,745 | $45.7M | 8.89% | −118,723−5.4% | Reduced |
| Jennison Associates LLC | 2,021,376 | $44.4M | 0.03% | +601,260+42.3% | Added |
| Goldman Sachs Group Inc | 1,683,400 | $37.0M | 0.01% | +252,028+17.6% | Added |
| Jacobs Levy Equity Management, Inc | 1,653,708 | $36.3M | 0.14% | +171,755+11.6% | Added |
| Geode Capital Management, LLC | 1,649,383 | $36.3M | 0.00% | +51,102+3.2% | Added |
| Driehaus Capital Management LLC | 1,610,342 | $35.4M | 0.24% | +1,610,342 | New |
| Freestone Grove Partners LP | 1,442,836 | $31.7M | 0.23% | −427,471−22.9% | Reduced |
| BNP Paribas Arbitrage, SA | 1,248,481 | $27.4M | 0.02% | +1,028,866+468.5% | Added |
| Assenagon Asset Management S.A. | 1,227,856 | $27.0M | 0.04% | +1,227,856 | New |
| Two Sigma Investments, LP | 1,201,527 | $26.4M | 0.04% | +84,325+7.5% | Added |
| Baillie Gifford & Co | 1,145,516 | $25.2M | 0.02% | +24,921+2.2% | Added |
| First Light Asset Management, LLC | 1,089,493 | $23.9M | 1.83% | +1,089,493 | New |
| Two Sigma Advisers, LP | 937,983 | $20.6M | 0.04% | −32,900−3.4% | Reduced |
| Barclays PLC | 917,927 | $20.2M | 0.01% | −272,200−22.9% | Reduced |
| Marshall Wace, LLP | 875,531 | $19.2M | 0.02% | +875,531 | New |
| D. E. Shaw & Co., Inc. | 854,266 | $18.8M | 0.01% | −22,951−2.6% | Reduced |
| Bank of America Corp | 702,503 | $15.4M | 0.00% | +44,150+6.7% | Added |
| Northern Trust Corp | 691,693 | $15.2M | 0.00% | +810+0.1% | Added |
| FMR LLC | 672,647 | $14.8M | 0.00% | −197,476−22.7% | Reduced |
| Royce & Associates LP | 650,250 | $14.3M | 0.14% | +140,250+27.5% | Added |
| Charles Schwab Investment Management Inc | 646,310 | $14.2M | 0.00% | +87,857+15.7% | Added |
| Millennium Management LLC | 583,573 | $12.8M | 0.01% | −122,329−17.3% | Reduced |
| Nuveen, LLC | 563,274 | $12.4M | 0.00% | +60,664+12.1% | Added |
| Standard Life Aberdeen plc | 547,035 | $12.0M | 0.02% | −51,061−8.5% | Reduced |
| UBS Group AG | 417,833 | $9.18M | 0.00% | −1,086,544−72.2% | Reduced |
| Frontier Capital Management Co LLC | 412,269 | $9.06M | 0.10% | −3,075−0.7% | Reduced |
| Acadian Asset Management LLC | 392,763 | $8.63M | 0.01% | −525,960−57.2% | Reduced |
| DAFNA Capital Management LLC | 355,208 | $7.81M | 1.81% | 00.0% | Unchanged |
| Bank of New York Mellon Corp | 349,753 | $7.69M | 0.00% | −34,381−9.0% | Reduced |
| JPMorgan Chase & Co | 341,631 | $7.51M | 0.00% | −17,440−4.9% | Reduced |
| AQR Capital Management LLC | 339,579 | $7.46M | 0.00% | −75,566−18.2% | Reduced |
| Principal Financial Group Inc | 324,262 | $7.13M | 0.00% | −2,439−0.7% | Reduced |
| Voya Investment Management LLC | 319,528 | $7.02M | 0.01% | +145,382+83.5% | Added |
| Quantinno Capital Management LP | 292,509 | $6.43M | 0.01% | +91,716+45.7% | Added |
| Invesco Ltd. | 277,722 | $6.10M | 0.00% | −24,319−8.1% | Reduced |
| Sector Gamma AS | 267,091 | $5.87M | 1.34% | −2,451−0.9% | Reduced |
| Lisanti Capital Growth, LLC | 262,885 | $5.78M | 1.37% | +262,885 | New |
| Balyasny Asset Management LLC | 262,788 | $5.78M | 0.01% | +262,788 | New |
| Edmond de Rothschild Holding S.A. | 258,200 | $5.68M | 0.08% | −75,000−22.5% | Reduced |
| Public Sector Pension Investment Board | 234,673 | $5.16M | 0.02% | −28,891−11.0% | Reduced |
| Alliancebernstein L.P. | 234,293 | $5.15M | 0.00% | +10,573+4.7% | Added |
| Envestnet Asset Management Inc | 221,654 | $4.87M | 0.00% | −14,678−6.2% | Reduced |
| Jane Street Group, LLC | 209,975 | $4.62M | 0.01% | −7,336−3.4% | Reduced |
| Royal Bank of Canada | 208,528 | $4.58M | 0.00% | −472,550−69.4% | Reduced |
| Rhumbline Advisers | 184,219 | $4.05M | 0.00% | −5,965−3.1% | Reduced |
| Adage Capital Partners GP, L.L.C. | 182,995 | $4.02M | 0.01% | +182,995 | New |
| Canada Pension Plan Investment Board | 177,600 | $3.90M | 0.00% | 00.0% | Unchanged |
| Legal & General Group Plc | 171,861 | $3.78M | 0.00% | −10,571−5.8% | Reduced |
| HRT Financial LP | 170,480 | $3.75M | 0.01% | +81,719+92.1% | Added |
| UBS Asset Management Americas Inc | 164,902 | $3.62M | 0.00% | −19,993−10.8% | Reduced |
| Panagora Asset Management Inc | 146,234 | $3.21M | 0.01% | −48,991−25.1% | Reduced |
| Mizuho Markets Americas LLC | 144,617 | $3.18M | 0.07% | +27,255+23.2% | Added |
| Arrowstreet Capital, Limited Partnership | 135,753 | $2.98M | 0.00% | +135,753 | New |
| Swiss National Bank | 133,300 | $2.93M | 0.00% | +4,200+3.3% | Added |
| Susquehanna International Group, LLP | 130,321 | $2.86M | 0.00% | −44,775−25.6% | Reduced |
| Ameriprise Financial Inc | 128,720 | $2.83M | 0.00% | −40,010−23.7% | Reduced |
| Russell Investments Group, Ltd. | 128,660 | $2.83M | 0.00% | −9,012−6.5% | Reduced |
| Raymond James Financial Inc | 120,169 | $2.64M | 0.00% | −16,757−12.2% | Reduced |
| PDT Partners, LLC | 110,385 | $2.43M | 0.16% | −60,035−35.2% | Reduced |
| Algert Global LLC | 108,939 | $2.39M | 0.04% | −117,947−52.0% | Reduced |
| Tudor Investment Corp Et Al | 108,063 | $2.38M | 0.01% | +108,063 | New |
| SEI Investments Co | 106,598 | $2.34M | 0.00% | −109,386−50.6% | Reduced |
| Trexquant Investment LP | 102,719 | $2.26M | 0.02% | −395,001−79.4% | Reduced |
| Wellington Management Group LLP | 98,309 | $2.16M | 0.00% | +98,309 | New |
| Banque Pictet & Cie SA | 97,187 | $2.14M | 0.02% | +22,205+29.6% | Added |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 89,094 | $1.96M | 0.00% | −9,216−9.4% | Reduced |
| Engineers Gate Manager LP | 88,547 | $1.95M | 0.02% | +88,547 | New |
| Wells Fargo & Company | 84,411 | $1.86M | 0.00% | +32,237+61.8% | Added |
| Y-Intercept (Hong Kong) Ltd | 83,986 | $1.85M | 0.04% | +27,061+47.5% | Added |
| Cerity Partners LLC | 76,771 | $1.69M | 0.00% | +472+0.6% | Added |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 74,015 | $1.63M | 0.00% | +52,566+245.1% | Added |
| Legato Capital Management LLC | 72,580 | $1.60M | 0.14% | +72,580 | New |
| Formula Growth Ltd | 70,919 | $1.56M | 0.60% | −51,177−41.9% | Reduced |
| New York State Teachers Retirement System | 68,300 | $1.50M | 0.00% | 00.0% | Unchanged |
| Susquehanna Portfolio Strategies, LLC | 66,452 | $1.46M | 0.02% | −139,602−67.8% | Reduced |
| Prudential Financial Inc | 65,014 | $1.43M | 0.00% | −4,420−6.4% | Reduced |
| California State Teachers Retirement System | 64,411 | $1.42M | 0.00% | +3,810+6.3% | Added |
| Rice Hall James & Associates, LLC | 62,415 | $1.37M | 0.08% | −40,154−39.1% | Reduced |
| SG Americas Securities, LLC | 61,958 | $1.36M | 0.00% | −1,093−1.7% | Reduced |
| Mirae Asset Global ETFs Holdings Ltd. | 61,443 | $1.35M | 0.00% | −1,255−2.0% | Reduced |
| Group One Trading, L.P. | 60,736 | $1.33M | 0.04% | −24,035−28.4% | Reduced |
| Natixis Advisors, L.P. | 57,021 | $1.25M | 0.00% | +617+1.1% | Added |
| Price T Rowe Associates Inc | 56,809 | $1.25M | 0.00% | −8,994−13.7% | Reduced |
| Great West Life Assurance Co | 56,332 | $1.24M | 0.00% | 00.0% | Unchanged |
| Norges Bank | 54,306 | $1.19M | 0.00% | +54,306 | New |
| Deutsche Bank AG | 54,230 | $1.19M | 0.00% | −536−1.0% | Reduced |
| Thrivent Financial for Lutherans | 46,589 | $1.02M | 0.00% | −2,157−4.4% | Reduced |
| Nierenberg Investment Management Company, Inc. | 44,555 | $979.3K | 0.49% | +44,555 | New |
| Winton Group Ltd | 44,244 | $972.5K | 0.03% | +44,244 | New |
| State of Wisconsin Investment Board | 43,090 | $947.1K | 0.00% | −21,591−33.4% | Reduced |
| Jump Financial, LLC | 41,416 | $910.3K | 0.01% | −77,028−65.0% | Reduced |
| Brinker Capital Investments, LLC | 40,579 | $891.9K | 0.01% | −3,403−7.7% | Reduced |