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 |
|---|---|---|---|---|---|
| Tudor Investment Corp Et Al | 108,063 | $2.38M | 0.01% | +108,063 | New |
| Algert Global LLC | 108,939 | $2.39M | 0.04% | −117,947−52.0% | Reduced |
| PDT Partners, LLC | 110,385 | $2.43M | 0.16% | −60,035−35.2% | Reduced |
| Raymond James Financial Inc | 120,169 | $2.64M | 0.00% | −16,757−12.2% | Reduced |
| Russell Investments Group, Ltd. | 128,660 | $2.83M | 0.00% | −9,012−6.5% | Reduced |
| Ameriprise Financial Inc | 128,720 | $2.83M | 0.00% | −40,010−23.7% | Reduced |
| Susquehanna International Group, LLP | 130,321 | $2.86M | 0.00% | −44,775−25.6% | Reduced |
| Swiss National Bank | 133,300 | $2.93M | 0.00% | +4,200+3.3% | Added |
| Arrowstreet Capital, Limited Partnership | 135,753 | $2.98M | 0.00% | +135,753 | New |
| Mizuho Markets Americas LLC | 144,617 | $3.18M | 0.07% | +27,255+23.2% | Added |
| Panagora Asset Management Inc | 146,234 | $3.21M | 0.01% | −48,991−25.1% | Reduced |
| UBS Asset Management Americas Inc | 164,902 | $3.62M | 0.00% | −19,993−10.8% | Reduced |
| HRT Financial LP | 170,480 | $3.75M | 0.01% | +81,719+92.1% | Added |
| Legal & General Group Plc | 171,861 | $3.78M | 0.00% | −10,571−5.8% | Reduced |
| Canada Pension Plan Investment Board | 177,600 | $3.90M | 0.00% | 00.0% | Unchanged |
| Adage Capital Partners GP, L.L.C. | 182,995 | $4.02M | 0.01% | +182,995 | New |
| Rhumbline Advisers | 184,219 | $4.05M | 0.00% | −5,965−3.1% | Reduced |
| Royal Bank of Canada | 208,528 | $4.58M | 0.00% | −472,550−69.4% | Reduced |
| Jane Street Group, LLC | 209,975 | $4.62M | 0.01% | −7,336−3.4% | Reduced |
| Envestnet Asset Management Inc | 221,654 | $4.87M | 0.00% | −14,678−6.2% | Reduced |
| Alliancebernstein L.P. | 234,293 | $5.15M | 0.00% | +10,573+4.7% | Added |
| Public Sector Pension Investment Board | 234,673 | $5.16M | 0.02% | −28,891−11.0% | Reduced |
| Edmond de Rothschild Holding S.A. | 258,200 | $5.68M | 0.08% | −75,000−22.5% | Reduced |
| Balyasny Asset Management LLC | 262,788 | $5.78M | 0.01% | +262,788 | New |
| Lisanti Capital Growth, LLC | 262,885 | $5.78M | 1.37% | +262,885 | New |
| Sector Gamma AS | 267,091 | $5.87M | 1.34% | −2,451−0.9% | Reduced |
| Invesco Ltd. | 277,722 | $6.10M | 0.00% | −24,319−8.1% | Reduced |
| Quantinno Capital Management LP | 292,509 | $6.43M | 0.01% | +91,716+45.7% | Added |
| Voya Investment Management LLC | 319,528 | $7.02M | 0.01% | +145,382+83.5% | Added |
| Principal Financial Group Inc | 324,262 | $7.13M | 0.00% | −2,439−0.7% | Reduced |
| AQR Capital Management LLC | 339,579 | $7.46M | 0.00% | −75,566−18.2% | Reduced |
| JPMorgan Chase & Co | 341,631 | $7.51M | 0.00% | −17,440−4.9% | Reduced |
| Bank of New York Mellon Corp | 349,753 | $7.69M | 0.00% | −34,381−9.0% | Reduced |
| DAFNA Capital Management LLC | 355,208 | $7.81M | 1.81% | 00.0% | Unchanged |
| Acadian Asset Management LLC | 392,763 | $8.63M | 0.01% | −525,960−57.2% | Reduced |
| Frontier Capital Management Co LLC | 412,269 | $9.06M | 0.10% | −3,075−0.7% | Reduced |
| UBS Group AG | 417,833 | $9.18M | 0.00% | −1,086,544−72.2% | Reduced |
| Standard Life Aberdeen plc | 547,035 | $12.0M | 0.02% | −51,061−8.5% | Reduced |
| Nuveen, LLC | 563,274 | $12.4M | 0.00% | +60,664+12.1% | Added |
| Millennium Management LLC | 583,573 | $12.8M | 0.01% | −122,329−17.3% | Reduced |
| Charles Schwab Investment Management Inc | 646,310 | $14.2M | 0.00% | +87,857+15.7% | Added |
| Royce & Associates LP | 650,250 | $14.3M | 0.14% | +140,250+27.5% | Added |
| FMR LLC | 672,647 | $14.8M | 0.00% | −197,476−22.7% | Reduced |
| Northern Trust Corp | 691,693 | $15.2M | 0.00% | +810+0.1% | Added |
| Bank of America Corp | 702,503 | $15.4M | 0.00% | +44,150+6.7% | Added |
| D. E. Shaw & Co., Inc. | 854,266 | $18.8M | 0.01% | −22,951−2.6% | Reduced |
| Marshall Wace, LLP | 875,531 | $19.2M | 0.02% | +875,531 | New |
| Barclays PLC | 917,927 | $20.2M | 0.01% | −272,200−22.9% | Reduced |
| Two Sigma Advisers, LP | 937,983 | $20.6M | 0.04% | −32,900−3.4% | Reduced |
| First Light Asset Management, LLC | 1,089,493 | $23.9M | 1.83% | +1,089,493 | New |
| Baillie Gifford & Co | 1,145,516 | $25.2M | 0.02% | +24,921+2.2% | Added |
| Two Sigma Investments, LP | 1,201,527 | $26.4M | 0.04% | +84,325+7.5% | Added |
| Assenagon Asset Management S.A. | 1,227,856 | $27.0M | 0.04% | +1,227,856 | New |
| BNP Paribas Arbitrage, SA | 1,248,481 | $27.4M | 0.02% | +1,028,866+468.5% | Added |
| Freestone Grove Partners LP | 1,442,836 | $31.7M | 0.23% | −427,471−22.9% | Reduced |
| Driehaus Capital Management LLC | 1,610,342 | $35.4M | 0.24% | +1,610,342 | New |
| Geode Capital Management, LLC | 1,649,383 | $36.3M | 0.00% | +51,102+3.2% | Added |
| Jacobs Levy Equity Management, Inc | 1,653,708 | $36.3M | 0.14% | +171,755+11.6% | Added |
| Goldman Sachs Group Inc | 1,683,400 | $37.0M | 0.01% | +252,028+17.6% | Added |
| Jennison Associates LLC | 2,021,376 | $44.4M | 0.03% | +601,260+42.3% | Added |
| Paradice Investment Management LLC | 2,077,745 | $45.7M | 8.89% | −118,723−5.4% | Reduced |
| Morgan Stanley | 2,080,497 | $45.7M | 0.00% | +1,342,950+182.1% | Added |
| Citadel Advisors LLC | 2,088,603 | $45.9M | 0.03% | +2,048,802+5,147.6% | Added |
| State Street Corp | 2,641,724 | $58.1M | 0.00% | −26,464−1.0% | Reduced |
| GW&K Investment Management, LLC | 2,675,157 | $58.8M | 0.51% | −46,492−1.7% | Reduced |
| ArrowMark Colorado Holdings LLC | 2,889,691 | $63.5M | 1.40% | −801,507−21.7% | Reduced |
| Sessa Capital IM, L.P. | 5,000,000 | $109.9M | 2.18% | 00.0% | Unchanged |
| Vanguard Group Inc | 7,341,356 | $161.4M | 0.00% | +278,042+3.9% | Added |
| BlackRock, Inc. | 11,149,181 | $245.1M | 0.00% | −952,290−7.9% | Reduced |
| Hood River Capital Management LLC | 0 | $0 | 0.00% | −2,551,644−100.0% | Sold out |
| Connor, Clark & Lunn Investment Management Ltd. | 0 | $0 | 0.00% | −615,221−100.0% | Sold out |
| Walleye Capital LLC | 0 | $0 | 0.00% | −463,376−100.0% | Sold out |
| Brown Capital Management LLC | 0 | $0 | 0.00% | −363,352−100.0% | Sold out |
| Moore Capital Management, LP | 0 | $0 | 0.00% | −220,479−100.0% | Sold out |
| Divisadero Street Capital Management, LP | 0 | $0 | 0.00% | −174,692−100.0% | Sold out |
| Renaissance Technologies LLC | 0 | $0 | 0.00% | −161,500−100.0% | Sold out |
| Dark Forest Capital Management LP | 0 | $0 | 0.00% | −75,535−100.0% | Sold out |
| XTX Topco Ltd | 0 | $0 | 0.00% | −73,545−100.0% | Sold out |
| First Trust Advisors LP | 0 | $0 | 0.00% | −40,730−100.0% | Sold out |
| Quadrature Capital Ltd | 0 | $0 | 0.00% | −26,756−100.0% | Sold out |
| Versor Investments LP | 0 | $0 | 0.00% | −26,200−100.0% | Sold out |
| Handelsbanken Fonder AB | 0 | $0 | 0.00% | −22,000−100.0% | Sold out |
| Prelude Capital Management, LLC | 0 | $0 | 0.00% | −18,754−100.0% | Sold out |
| Keebeck Alpha, LP | 0 | $0 | 0.00% | −16,623−100.0% | Sold out |
| Atom Investors LP | 0 | $0 | 0.00% | −13,521−100.0% | Sold out |
| Everence Capital Management Inc | 0 | $0 | 0.00% | −12,376−100.0% | Sold out |
| Davy Global Fund Management Ltd | 0 | $0 | 0.00% | −11,851−100.0% | Sold out |
| Advisory Services Network, LLC | 0 | $0 | 0.00% | −8,274−100.0% | Sold out |
| Aster Capital Management (DIFC) Ltd | 0 | $0 | 0.00% | −5,149−100.0% | Sold out |
| Simplex Trading, LLC | 0 | $0 | 0.00% | −3,558−100.0% | Sold out |
| Salem Investment Counselors Inc | 0 | $0 | 0.00% | −1,000−100.0% | Sold out |
| Clearstead Advisors, LLC | 0 | $0 | 0.00% | −658−100.0% | Sold out |
| Optiver Holding B.V. | 0 | $0 | 0.00% | −460−100.0% | Sold out |
| Principal Securities, Inc. | 0 | $0 | 0.00% | −381−100.0% | Sold out |
| Wealthspire Advisors, LLC | 0 | $0 | 0.00% | −330−100.0% | Sold out |
| Banque Cantonale Vaudoise | 0 | $0 | 0.00% | −237−100.0% | Sold out |
| Mather Group, LLC. | 0 | $0 | 0.00% | −175−100.0% | Sold out |
| Prestige Wealth Management Group LLC | 0 | $0 | 0.00% | −65−100.0% | Sold out |
| Ameritas Advisory Services, LLC | 0 | $0 | 0.00% | −50−100.0% | Sold out |
| Atlantic Trust, LLC | 0 | $0 | 0.00% | −13−100.0% | Sold out |