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, Q1 2026
Institutional positions in Tandem Diabetes Care Inc as of Mar 31, 2026. 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
- 274
- +11 vs. Q4 2025
- Shares held
- 78.7M
- +11.2M (+16.6%) vs. Q4 2025
- Total value
- $1.51B
- +$26.2M (+1.8%) vs. Q4 2025
- New holders
- 45
- 96 more added
- Sold out
- 34
- 93 more reduced
6 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 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, Q1 2026
Shares, value and share of portfolio for each institution holding Tandem Diabetes Care Inc; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Syon Capital LLC | 11,437 | $219.2K | 0.01% | +11,437 | New |
| EP Wealth Advisors, LLC | 11,886 | $227.9K | 0.00% | +1,909+19.1% | Added |
| Guggenheim Capital LLC | 12,389 | $237.5K | 0.00% | +1,235+11.1% | Added |
| DRW Securities, LLC | 12,419 | $238.1K | 0.01% | +12,419 | New |
| Amundi | 12,615 | $241.8K | 0.00% | −16,830−57.2% | Reduced |
| Cresset Asset Management, LLC | 12,618 | $241.9K | 0.00% | +12,618 | New |
| Counterpoint Mutual Funds LLC | 12,679 | $243.1K | 0.04% | −10,179−44.5% | Reduced |
| Evergreen Capital Management LLC | 12,992 | $249.1K | 0.01% | +12,992 | New |
| Banco Santander, S.A. | 13,700 | $262.6K | 0.00% | +13,700 | New |
| Greenwood Capital Associates LLC | 13,941 | $267.2K | 0.03% | −1,409−9.2% | Reduced |
| Caitong International Asset Management Co., Ltd | 14,245 | $273.1K | 0.05% | +13,814+3,205.1% | Added |
| KLP Kapitalforvaltning AS | 14,500 | $278.0K | 0.00% | 00.0% | Unchanged |
| State of Tennessee, Treasury Department | 14,647 | $280.8K | 0.00% | −6,867−31.9% | Reduced |
| Captrust Financial Advisors | 15,041 | $288.3K | 0.00% | +1,930+14.7% | Added |
| Oregon Public Employees Retirement Fund | 15,505 | $297.2K | 0.00% | 00.0% | Unchanged |
| 180 Wealth Advisors, LLC | 15,763 | $302.2K | 0.03% | +2,320+17.3% | Added |
| Neuberger Berman Group LLC | 16,069 | $308.0K | 0.00% | +91+0.6% | Added |
| Commerce Bank | 16,342 | $313.3K | 0.00% | −290−1.7% | Reduced |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 16,767 | $321.4K | 0.00% | −19−0.1% | Reduced |
| Teachers Retirement System of the State of Kentucky | 16,851 | $323.0K | 0.00% | 00.0% | Unchanged |
| Vanguard Investments Australia, Ltd. | 16,889 | $323.8K | 0.00% | +16,889 | New |
| Allianz Asset Management GmbH | 16,900 | $324.0K | 0.00% | +16,900 | New |
| Colony Group, LLC | 17,534 | $336.5K | 0.00% | +7,988+83.7% | Added |
| Franklin Resources Inc | 17,869 | $342.5K | 0.00% | −10,028−35.9% | Reduced |
| State of Wyoming | 17,964 | $344.4K | 0.04% | −13,834−43.5% | Reduced |
| Yousif Capital Management, LLC | 18,450 | $353.7K | 0.00% | −331−1.8% | Reduced |
| Police & Firemen's Retirement System of New Jersey | 18,505 | $354.7K | 0.00% | 00.0% | Unchanged |
| State Board of Administration of Florida Retirement System | 18,552 | $355.6K | 0.00% | 00.0% | Unchanged |
| Arizona State Retirement System | 18,623 | $357.0K | 0.00% | −274−1.4% | Reduced |
| Amalgamated Bank | 19,518 | $374.0K | 0.00% | −122−0.6% | Reduced |
| New York State Common Retirement Fund | 19,948 | $382.4K | 0.00% | 00.0% | Unchanged |
| Mercer Global Advisors Inc | 20,212 | $387.5K | 0.00% | +8,918+79.0% | Added |
| The PNC Financial Services Group, Inc. | 20,817 | $399.1K | 0.00% | −1,530−6.8% | Reduced |
| Diversified Trust Co | 21,332 | $408.9K | 0.01% | +1,774+9.1% | Added |
| Wealth Enhancement Advisory Services, LLC | 22,120 | $411.6K | 0.00% | +3,427+18.3% | Added |
| Gsa Capital Partners LLP | 22,536 | $432.0K | 0.03% | −8,648−27.7% | Reduced |
| Fifth Third Bancorp | 22,605 | $433.3K | 0.00% | +21,566+2,075.6% | Added |
| Virginia Retirement Systems Et Al | 22,800 | $437.1K | 0.00% | −1,900−7.7% | Reduced |
| Advisors Asset Management, Inc. | 23,341 | $447.4K | 0.01% | −435−1.8% | Reduced |
| CWM, LLC | 24,771 | $474.9K | 0.00% | +322+1.3% | Added |
| Gabelli Funds LLC | 25,000 | $479.3K | 0.00% | +25,000 | New |
| VARCOV Co. | 26,562 | $509.2K | 0.19% | +26,562 | New |
| Stifel Financial Corp | 26,944 | $516.5K | 0.00% | −541−2.0% | Reduced |
| Vanguard Global Advisers, LLC | 26,959 | $516.8K | 0.00% | +26,959 | New |
| CWM Advisors, LLC | 27,010 | $517.8K | 0.03% | +5,944+28.2% | Added |
| Dynamic Technology Lab Private Ltd | 27,886 | $534.6K | 0.09% | +27,886 | New |
| Manufacturers Life Insurance Company, The | 28,722 | $550.6K | 0.00% | −998−3.4% | Reduced |
| LPL Financial LLC | 29,483 | $565.2K | 0.00% | −10,107−25.5% | Reduced |
| Janus Henderson Group PLC | 29,811 | $571.3K | 0.00% | 00.0% | Unchanged |
| Louisiana State Employees Retirement System | 30,100 | $577.0K | 0.01% | −1,000−3.2% | Reduced |
| Truist Financial Corp | 30,619 | $587.0K | 0.00% | +2,448+8.7% | Added |
| Wells Fargo & Company | 31,530 | $604.4K | 0.00% | −52,881−62.6% | Reduced |
| Mariner, LLC | 33,008 | $632.8K | 0.00% | −2,521−7.1% | Reduced |
| SG Americas Securities, LLC | 33,022 | $633.0K | 0.00% | −28,936−46.7% | Reduced |
| CI Private Wealth, LLC | 33,741 | $636.7K | 0.00% | +14,206+72.7% | Added |
| American Century Companies Inc | 33,470 | $641.6K | 0.00% | +710+2.2% | Added |
| HighMark Wealth Management LLC | 34,120 | $654.1K | 0.27% | −1,000−2.8% | Reduced |
| Bank of Montreal | 37,435 | $717.6K | 0.00% | +18,913+102.1% | Added |
| State of Alaska, Department of Revenue | 37,569 | $719.0K | 0.01% | −1,107−2.9% | Reduced |
| Summit Trail Advisors, LLC | 37,743 | $723.5K | 0.01% | +3,214+9.3% | Added |
| Brevan Howard Capital Management LP | 38,336 | $734.9K | 0.01% | +4,245+12.5% | Added |
| MetLife Investment Management | 38,808 | $743.9K | 0.00% | −283−0.7% | Reduced |
| Ieq Capital, LLC | 39,007 | $747.8K | 0.00% | +11,829+43.5% | Added |
| Oppenheimer Asset Management Inc. | 40,791 | $782.0K | 0.01% | +2,851+7.5% | Added |
| Brinker Capital Investments, LLC | 41,870 | $802.6K | 0.01% | +1,291+3.2% | Added |
| State of Wisconsin Investment Board | 42,578 | $816.2K | 0.00% | −512−1.2% | Reduced |
| Thrivent Financial for Lutherans | 45,256 | $868.0K | 0.00% | −1,333−2.9% | Reduced |
| Legato Capital Management LLC | 50,085 | $960.1K | 0.09% | −22,495−31.0% | Reduced |
| Twinbeech Capital LP | 51,366 | $984.7K | 0.10% | +51,366 | New |
| Qube Research & Technologies Ltd | 51,961 | $996.1K | 0.00% | +51,961 | New |
| Great West Life Assurance Co | 53,286 | $1.02M | 0.00% | −3,046−5.4% | Reduced |
| Mirae Asset Global ETFs Holdings Ltd. | 55,187 | $1.06M | 0.00% | −6,256−10.2% | Reduced |
| Jefferies Financial Group Inc. | 56,722 | $1.09M | 0.01% | +56,722 | New |
| Renaissance Technologies LLC | 58,227 | $1.12M | 0.00% | +58,227 | New |
| Vanguard Asset Management, Ltd | 58,288 | $1.12M | 0.00% | +58,288 | New |
| Deutsche Bank AG | 60,629 | $1.16M | 0.00% | +6,399+11.8% | Added |
| XTX Topco Ltd | 60,821 | $1.17M | 0.02% | +60,821 | New |
| Natixis Advisors, L.P. | 61,084 | $1.17M | 0.00% | +4,063+7.1% | Added |
| Cinctive Capital Management LP | 63,812 | $1.22M | 0.08% | +63,812 | New |
| Jones Financial Companies LLLP | 58,388 | $1.23M | 0.00% | +56,826+3,638.0% | Added |
| New York State Teachers Retirement System | 66,096 | $1.27M | 0.00% | −2,204−3.2% | Reduced |
| Citigroup Inc | 68,346 | $1.31M | 0.00% | +49,978+272.1% | Added |
| Price T Rowe Associates Inc | 68,661 | $1.32M | 0.00% | +11,852+20.9% | Added |
| Prudential Financial Inc | 69,404 | $1.33M | 0.00% | +4,390+6.8% | Added |
| Formula Growth Ltd | 70,828 | $1.36M | 0.61% | −91−0.1% | Reduced |
| Rice Hall James & Associates, LLC | 72,878 | $1.40M | 0.08% | +10,463+16.8% | Added |
| Cerity Partners LLC | 76,228 | $1.46M | 0.00% | −543−0.7% | Reduced |
| Y-Intercept (Hong Kong) Ltd | 77,879 | $1.49M | 0.03% | −6,107−7.3% | Reduced |
| Tudor Investment Corp Et Al | 78,999 | $1.51M | 0.01% | −29,064−26.9% | Reduced |
| Nierenberg Investment Management Company, Inc. | 79,510 | $1.52M | 0.76% | +34,955+78.5% | Added |
| Susquehanna International Group, LLP | 80,749 | $1.55M | 0.00% | −49,572−38.0% | Reduced |
| Alliancebernstein L.P. | 73,149 | $1.61M | 0.00% | −161,144−68.8% | Reduced |
| California State Teachers Retirement System | 84,255 | $1.62M | 0.00% | +19,844+30.8% | Added |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 87,357 | $1.67M | 0.00% | −1,737−1.9% | Reduced |
| PDT Partners, LLC | 93,805 | $1.80M | 0.11% | −16,580−15.0% | Reduced |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 94,340 | $1.81M | 0.00% | +20,325+27.5% | Added |
| SEI Investments Co | 95,306 | $1.83M | 0.00% | −11,292−10.6% | Reduced |
| Verition Fund Management LLC | 107,119 | $2.05M | 0.02% | +96,532+911.8% | Added |
| Intech Investment Management LLC | 111,421 | $2.14M | 0.02% | +84,050+307.1% | Added |
| Algert Global LLC | 117,799 | $2.26M | 0.03% | +8,860+8.1% | Added |