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 |
|---|---|---|---|---|---|
| Renaissance Technologies LLC | 58,227 | $1.12M | 0.00% | +58,227 | New |
| Jefferies Financial Group Inc. | 56,722 | $1.09M | 0.01% | +56,722 | New |
| Mirae Asset Global ETFs Holdings Ltd. | 55,187 | $1.06M | 0.00% | −6,256−10.2% | Reduced |
| Great West Life Assurance Co | 53,286 | $1.02M | 0.00% | −3,046−5.4% | Reduced |
| Qube Research & Technologies Ltd | 51,961 | $996.1K | 0.00% | +51,961 | New |
| Twinbeech Capital LP | 51,366 | $984.7K | 0.10% | +51,366 | New |
| Legato Capital Management LLC | 50,085 | $960.1K | 0.09% | −22,495−31.0% | Reduced |
| Thrivent Financial for Lutherans | 45,256 | $868.0K | 0.00% | −1,333−2.9% | Reduced |
| State of Wisconsin Investment Board | 42,578 | $816.2K | 0.00% | −512−1.2% | Reduced |
| Brinker Capital Investments, LLC | 41,870 | $802.6K | 0.01% | +1,291+3.2% | Added |
| Oppenheimer Asset Management Inc. | 40,791 | $782.0K | 0.01% | +2,851+7.5% | Added |
| Ieq Capital, LLC | 39,007 | $747.8K | 0.00% | +11,829+43.5% | Added |
| MetLife Investment Management | 38,808 | $743.9K | 0.00% | −283−0.7% | Reduced |
| Brevan Howard Capital Management LP | 38,336 | $734.9K | 0.01% | +4,245+12.5% | Added |
| Summit Trail Advisors, LLC | 37,743 | $723.5K | 0.01% | +3,214+9.3% | Added |
| State of Alaska, Department of Revenue | 37,569 | $719.0K | 0.01% | −1,107−2.9% | Reduced |
| Bank of Montreal | 37,435 | $717.6K | 0.00% | +18,913+102.1% | Added |
| HighMark Wealth Management LLC | 34,120 | $654.1K | 0.27% | −1,000−2.8% | Reduced |
| American Century Companies Inc | 33,470 | $641.6K | 0.00% | +710+2.2% | Added |
| CI Private Wealth, LLC | 33,741 | $636.7K | 0.00% | +14,206+72.7% | Added |
| SG Americas Securities, LLC | 33,022 | $633.0K | 0.00% | −28,936−46.7% | Reduced |
| Mariner, LLC | 33,008 | $632.8K | 0.00% | −2,521−7.1% | Reduced |
| Wells Fargo & Company | 31,530 | $604.4K | 0.00% | −52,881−62.6% | Reduced |
| Truist Financial Corp | 30,619 | $587.0K | 0.00% | +2,448+8.7% | Added |
| Louisiana State Employees Retirement System | 30,100 | $577.0K | 0.01% | −1,000−3.2% | Reduced |
| Janus Henderson Group PLC | 29,811 | $571.3K | 0.00% | 00.0% | Unchanged |
| LPL Financial LLC | 29,483 | $565.2K | 0.00% | −10,107−25.5% | Reduced |
| Manufacturers Life Insurance Company, The | 28,722 | $550.6K | 0.00% | −998−3.4% | Reduced |
| Dynamic Technology Lab Private Ltd | 27,886 | $534.6K | 0.09% | +27,886 | New |
| CWM Advisors, LLC | 27,010 | $517.8K | 0.03% | +5,944+28.2% | Added |
| Vanguard Global Advisers, LLC | 26,959 | $516.8K | 0.00% | +26,959 | New |
| Stifel Financial Corp | 26,944 | $516.5K | 0.00% | −541−2.0% | Reduced |
| VARCOV Co. | 26,562 | $509.2K | 0.19% | +26,562 | New |
| Gabelli Funds LLC | 25,000 | $479.3K | 0.00% | +25,000 | New |
| CWM, LLC | 24,771 | $474.9K | 0.00% | +322+1.3% | Added |
| Advisors Asset Management, Inc. | 23,341 | $447.4K | 0.01% | −435−1.8% | Reduced |
| Virginia Retirement Systems Et Al | 22,800 | $437.1K | 0.00% | −1,900−7.7% | Reduced |
| Fifth Third Bancorp | 22,605 | $433.3K | 0.00% | +21,566+2,075.6% | Added |
| Gsa Capital Partners LLP | 22,536 | $432.0K | 0.03% | −8,648−27.7% | Reduced |
| Wealth Enhancement Advisory Services, LLC | 22,120 | $411.6K | 0.00% | +3,427+18.3% | Added |
| Diversified Trust Co | 21,332 | $408.9K | 0.01% | +1,774+9.1% | Added |
| The PNC Financial Services Group, Inc. | 20,817 | $399.1K | 0.00% | −1,530−6.8% | Reduced |
| Mercer Global Advisors Inc | 20,212 | $387.5K | 0.00% | +8,918+79.0% | Added |
| New York State Common Retirement Fund | 19,948 | $382.4K | 0.00% | 00.0% | Unchanged |
| Amalgamated Bank | 19,518 | $374.0K | 0.00% | −122−0.6% | Reduced |
| Arizona State Retirement System | 18,623 | $357.0K | 0.00% | −274−1.4% | Reduced |
| State Board of Administration of Florida Retirement System | 18,552 | $355.6K | 0.00% | 00.0% | Unchanged |
| Police & Firemen's Retirement System of New Jersey | 18,505 | $354.7K | 0.00% | 00.0% | Unchanged |
| Yousif Capital Management, LLC | 18,450 | $353.7K | 0.00% | −331−1.8% | Reduced |
| State of Wyoming | 17,964 | $344.4K | 0.04% | −13,834−43.5% | Reduced |
| Franklin Resources Inc | 17,869 | $342.5K | 0.00% | −10,028−35.9% | Reduced |
| Colony Group, LLC | 17,534 | $336.5K | 0.00% | +7,988+83.7% | Added |
| Allianz Asset Management GmbH | 16,900 | $324.0K | 0.00% | +16,900 | New |
| Vanguard Investments Australia, Ltd. | 16,889 | $323.8K | 0.00% | +16,889 | New |
| Teachers Retirement System of the State of Kentucky | 16,851 | $323.0K | 0.00% | 00.0% | Unchanged |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 16,767 | $321.4K | 0.00% | −19−0.1% | Reduced |
| Commerce Bank | 16,342 | $313.3K | 0.00% | −290−1.7% | Reduced |
| Neuberger Berman Group LLC | 16,069 | $308.0K | 0.00% | +91+0.6% | Added |
| 180 Wealth Advisors, LLC | 15,763 | $302.2K | 0.03% | +2,320+17.3% | Added |
| Oregon Public Employees Retirement Fund | 15,505 | $297.2K | 0.00% | 00.0% | Unchanged |
| Captrust Financial Advisors | 15,041 | $288.3K | 0.00% | +1,930+14.7% | Added |
| State of Tennessee, Treasury Department | 14,647 | $280.8K | 0.00% | −6,867−31.9% | Reduced |
| KLP Kapitalforvaltning AS | 14,500 | $278.0K | 0.00% | 00.0% | Unchanged |
| Caitong International Asset Management Co., Ltd | 14,245 | $273.1K | 0.05% | +13,814+3,205.1% | Added |
| Greenwood Capital Associates LLC | 13,941 | $267.2K | 0.03% | −1,409−9.2% | Reduced |
| Banco Santander, S.A. | 13,700 | $262.6K | 0.00% | +13,700 | New |
| Evergreen Capital Management LLC | 12,992 | $249.1K | 0.01% | +12,992 | New |
| Counterpoint Mutual Funds LLC | 12,679 | $243.1K | 0.04% | −10,179−44.5% | Reduced |
| Cresset Asset Management, LLC | 12,618 | $241.9K | 0.00% | +12,618 | New |
| Amundi | 12,615 | $241.8K | 0.00% | −16,830−57.2% | Reduced |
| DRW Securities, LLC | 12,419 | $238.1K | 0.01% | +12,419 | New |
| Guggenheim Capital LLC | 12,389 | $237.5K | 0.00% | +1,235+11.1% | Added |
| EP Wealth Advisors, LLC | 11,886 | $227.9K | 0.00% | +1,909+19.1% | Added |
| Syon Capital LLC | 11,437 | $219.2K | 0.01% | +11,437 | New |
| Victory Capital Management Inc | 10,883 | $208.6K | 0.00% | +1,112+11.4% | Added |
| Pictet Asset Management Holding SA | 10,764 | $206.3K | 0.00% | +10,764 | New |
| Park Avenue Securities LLC | 10,647 | $204.0K | 0.00% | +1,244+13.2% | Added |
| ProShare Advisors LLC | 10,554 | $202.3K | 0.00% | −2,631−20.0% | Reduced |
| Apollon Wealth Management, LLC | 10,534 | $201.9K | 0.00% | −424−3.9% | Reduced |
| Prosperitas Financial LLC | 10,000 | $191.7K | 0.07% | 00.0% | Unchanged |
| Leonteq Securities AG | 9,501 | $182.1K | 0.01% | +1,695+21.7% | Added |
| Tower Research Capital LLC (TRC) | 9,147 | $175.3K | 0.00% | −3,911−30.0% | Reduced |
| Advisory Services Network, LLC | 8,274 | $158.6K | 0.00% | +8,274 | New |
| Public Employees Retirement Association of Colorado | 7,650 | $147.0K | 0.00% | 00.0% | Unchanged |
| Bayforest Capital Ltd | 7,265 | $139.3K | 0.16% | −20,144−73.5% | Reduced |
| Ameritas Investment Partners, Inc. | 5,586 | $107.1K | 0.00% | 00.0% | Unchanged |
| Natixis | 5,500 | $105.4K | 0.00% | +5,500 | New |
| Ensign Peak Advisors, Inc | 5,032 | $96.5K | 0.00% | 00.0% | Unchanged |
| China Universal Asset Management Co., Ltd. | 5,000 | $95.8K | 0.01% | −3,000−37.5% | Reduced |
| Virtus ETF Advisers LLC | 4,400 | $84.3K | 0.04% | +4,400 | New |
| GAMMA Investing LLC | 3,502 | $67.1K | 0.00% | −1,040−22.9% | Reduced |
| Creative Financial Designs Inc | 3,431 | $65.8K | 0.00% | 00.0% | Unchanged |
| Versant Capital Management, Inc | 3,335 | $63.9K | 0.01% | +2,958+784.6% | Added |
| Pinnacle Wealth Planning Services, Inc. | 3,073 | $58.9K | 0.01% | +66+2.2% | Added |
| Farther Finance Advisors, LLC | 3,121 | $58.7K | 0.00% | −479−13.3% | Reduced |
| Van Eck Associates Corp | 2,918 | $56.0K | 0.00% | −512−14.9% | Reduced |
| Simplex Trading, LLC | 2,903 | $55.6K | 0.00% | +2,903 | New |
| Essential Partners LLC | 2,888 | $55.4K | 0.02% | +10.0% | Added |
| Nisa Investment Advisors, LLC | 2,782 | $53.3K | 0.00% | +1,447+108.4% | Added |
| Advisor Group Holdings, Inc. | 2,588 | $49.6K | 0.00% | −28−1.1% | Reduced |