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, Q2 2026
Institutional positions in Tandem Diabetes Care Inc as of Jun 30, 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
- +3 vs. Q1 2026
- Shares held
- 78.7M
- +94.9K (+0.1%) vs. Q1 2026
- Total value
- $1.19B
- −$319.1M (−21.2%) vs. Q1 2026
- New holders
- 48
- 95 more added
- Sold out
- 45
- 91 more reduced
3 institutions that held it in Q1 2026 haven't filed for Q2 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q1 2026: 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, Q2 2026
Shares, value and share of portfolio for each institution holding Tandem Diabetes Care Inc; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Gsa Capital Partners LLP | 67,901 | $1.02M | 0.06% | +45,365+201.3% | Added |
| Engineers Gate Manager LP | 64,662 | $975.8K | 0.01% | +64,662 | New |
| BNP Paribas Arbitrage, SA | 63,211 | $953.9K | 0.00% | −145,502−69.7% | Reduced |
| Natixis Advisors, L.P. | 60,956 | $919.0K | 0.00% | −128−0.2% | Reduced |
| Summit Trail Advisors, LLC | 59,862 | $903.3K | 0.01% | +22,119+58.6% | Added |
| Vanguard Asset Management, Ltd | 58,288 | $879.6K | 0.00% | 00.0% | Unchanged |
| Mirae Asset Global ETFs Holdings Ltd. | 56,396 | $851.0K | 0.00% | +1,209+2.2% | Added |
| Great West Life Assurance Co | 53,286 | $804.0K | 0.00% | 00.0% | Unchanged |
| Cambridge Investment Research Advisors, Inc. | 52,295 | $789.0K | 0.00% | +52,295 | New |
| Man Group plc | 50,977 | $769.2K | 0.00% | +50,977 | New |
| Franklin Resources Inc | 49,459 | $746.3K | 0.00% | +31,590+176.8% | Added |
| Thrivent Financial for Lutherans | 45,001 | $679.0K | 0.00% | −255−0.6% | Reduced |
| CWM Advisors, LLC | 44,097 | $665.4K | 0.03% | +17,087+63.3% | Added |
| Brinker Capital Investments, LLC | 43,713 | $659.6K | 0.01% | +1,843+4.4% | Added |
| LPL Financial LLC | 42,802 | $645.9K | 0.00% | +13,319+45.2% | Added |
| State of Wisconsin Investment Board | 41,473 | $625.8K | 0.00% | −1,105−2.6% | Reduced |
| MetLife Investment Management | 41,045 | $619.4K | 0.00% | +2,237+5.8% | Added |
| Brevan Howard Capital Management LP | 41,021 | $619.0K | 0.01% | +2,685+7.0% | Added |
| Oppenheimer Asset Management Inc. | 41,009 | $618.8K | 0.01% | +218+0.5% | Added |
| Fox Run Management, L.L.C. | 40,462 | $610.6K | 0.10% | +40,462 | New |
| Citigroup Inc | 40,230 | $607.1K | 0.00% | −28,116−41.1% | Reduced |
| Mariner, LLC | 36,750 | $554.6K | 0.00% | +3,742+11.3% | Added |
| State Board of Administration of Florida Retirement System | 34,628 | $522.5K | 0.00% | +16,076+86.7% | Added |
| HighMark Wealth Management LLC | 34,120 | $514.9K | 0.17% | 00.0% | Unchanged |
| Truist Financial Corp | 30,319 | $457.5K | 0.00% | −300−1.0% | Reduced |
| Louisiana State Employees Retirement System | 30,000 | $452.7K | 0.01% | −100−0.3% | Reduced |
| Jupiter Topco LLC | 29,811 | $449.7K | 0.00% | +29,811 | New |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 28,997 | $437.6K | 0.00% | −65,343−69.3% | Reduced |
| Manufacturers Life Insurance Company, The | 28,484 | $429.8K | 0.00% | −238−0.8% | Reduced |
| Wealth Enhancement Advisory Services, LLC | 26,438 | $407.4K | 0.00% | +4,318+19.5% | Added |
| Vanguard Global Advisers, LLC | 26,897 | $405.9K | 0.00% | −62−0.2% | Reduced |
| State of Alaska, Department of Revenue | 26,721 | $402.0K | 0.00% | −10,848−28.9% | Reduced |
| Assenagon Asset Management S.A. | 26,430 | $398.8K | 0.00% | −152,210−85.2% | Reduced |
| New York State Common Retirement Fund | 26,348 | $397.6K | 0.00% | +6,400+32.1% | Added |
| Virginia Retirement Systems Et Al | 26,200 | $395.4K | 0.00% | +3,400+14.9% | Added |
| Nomura Holdings Inc | 25,889 | $390.7K | 0.00% | +25,889 | New |
| Allstate Corp | 25,812 | $389.5K | 0.00% | +25,812 | New |
| 180 Wealth Advisors, LLC | 24,934 | $376.3K | 0.04% | +9,171+58.2% | Added |
| The PNC Financial Services Group, Inc. | 23,750 | $358.4K | 0.00% | +2,933+14.1% | Added |
| Greenwood Capital Associates LLC | 23,078 | $348.2K | 0.03% | +9,137+65.5% | Added |
| Fifth Third Bancorp | 22,126 | $333.9K | 0.00% | −479−2.1% | Reduced |
| State of Tennessee, Treasury Department | 22,070 | $333.0K | 0.00% | +7,423+50.7% | Added |
| Summit Global Investments | 21,736 | $328.0K | 0.02% | +21,736 | New |
| Police & Firemen's Retirement System of New Jersey | 21,488 | $324.3K | 0.00% | +2,983+16.1% | Added |
| Walleye Trading LLC | 20,849 | $314.6K | 0.00% | +20,849 | New |
| Leonteq Securities AG | 20,528 | $309.8K | 0.02% | +11,027+116.1% | Added |
| Rhenman & Partners Asset Management AB | 20,000 | $301.8K | 0.03% | +20,000 | New |
| Caitong International Asset Management Co., Ltd | 19,968 | $301.3K | 0.04% | +5,723+40.2% | Added |
| Prelude Capital Management, LLC | 19,002 | $286.7K | 0.02% | +19,002 | New |
| Arizona State Retirement System | 18,902 | $285.2K | 0.00% | +279+1.5% | Added |
| Yousif Capital Management, LLC | 18,505 | $279.2K | 0.00% | +55+0.3% | Added |
| Amalgamated Bank | 18,398 | $278.0K | 0.00% | −1,120−5.7% | Reduced |
| PDT Partners, LLC | 17,844 | $269.3K | 0.01% | −75,961−81.0% | Reduced |
| Dark Forest Capital Management LP | 17,430 | $263.0K | 0.02% | +17,430 | New |
| Captrust Financial Advisors | 16,918 | $255.3K | 0.00% | +1,877+12.5% | Added |
| Vanguard Investments Australia, Ltd. | 16,889 | $254.9K | 0.00% | 00.0% | Unchanged |
| Teachers Retirement System of the State of Kentucky | 16,851 | $254.0K | 0.00% | 00.0% | Unchanged |
| CI Private Wealth, LLC | 16,589 | $250.3K | 0.00% | −17,152−50.8% | Reduced |
| Mercer Global Advisors Inc | 16,412 | $247.7K | 0.00% | −3,800−18.8% | Reduced |
| Commerce Bank | 16,278 | $245.6K | 0.00% | −64−0.4% | Reduced |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 16,251 | $245.2K | 0.00% | −516−3.1% | Reduced |
| Creative Planning | 16,216 | $244.7K | 0.00% | +16,216 | New |
| SEI Investments Co | 15,814 | $238.6K | 0.00% | −79,492−83.4% | Reduced |
| Oregon Public Employees Retirement Fund | 15,605 | $235.5K | 0.00% | +100+0.6% | Added |
| KLP Kapitalforvaltning AS | 14,500 | $218.8K | 0.00% | 00.0% | Unchanged |
| Redhawk Wealth Advisors, Inc. | 13,731 | $207.2K | 0.02% | +13,731 | New |
| Keebeck Alpha, LP | 13,534 | $204.2K | 0.43% | +13,534 | New |
| Neuberger Berman Group LLC | 13,382 | $201.9K | 0.00% | −2,687−16.7% | Reduced |
| New Age Alpha Advisors, LLC | 12,853 | $194.0K | 0.01% | +12,853 | New |
| Advisors Asset Management, Inc. | 12,637 | $190.7K | 0.00% | −10,704−45.9% | Reduced |
| Guggenheim Capital LLC | 12,221 | $184.4K | 0.00% | −168−1.4% | Reduced |
| Proficio Capital Partners LLC | 11,897 | $179.5K | 0.01% | +11,897 | New |
| Amundi | 11,652 | $175.8K | 0.00% | −963−7.6% | Reduced |
| Cresset Asset Management, LLC | 11,112 | $167.7K | 0.00% | −1,506−11.9% | Reduced |
| Quadrature Capital Ltd | 10,898 | $164.5K | 0.00% | +10,898 | New |
| Bridgefront Capital, LLC | 10,844 | $163.6K | 0.04% | +10,844 | New |
| Pictet Asset Management Holding SA | 10,764 | $162.4K | 0.00% | 00.0% | Unchanged |
| Victory Capital Management Inc | 10,469 | $158.0K | 0.00% | −414−3.8% | Reduced |
| Prosperitas Financial LLC | 10,000 | $150.9K | 0.05% | 00.0% | Unchanged |
| SG Americas Securities, LLC | 8,795 | $133.0K | 0.00% | −24,227−73.4% | Reduced |
| Public Employees Retirement Association of Colorado | 7,650 | $115.0K | 0.00% | 00.0% | Unchanged |
| Mitsubishi UFJ Trust & Banking Corp | 7,494 | $113.1K | 0.00% | +7,494 | New |
| Ameritas Investment Partners, Inc. | 6,340 | $95.7K | 0.00% | +754+13.5% | Added |
| Caption Management, LLC | 6,200 | $93.6K | 0.00% | +6,200 | New |
| SRS Capital Advisors, Inc. | 5,996 | $90.5K | 0.00% | +5,248+701.6% | Added |
| Ensign Peak Advisors, Inc | 5,032 | $75.9K | 0.00% | 00.0% | Unchanged |
| Virtus ETF Advisers LLC | 4,511 | $68.1K | 0.03% | +111+2.5% | Added |
| Bayforest Capital Ltd | 3,792 | $57.2K | 0.05% | −3,473−47.8% | Reduced |
| Quantbot Technologies LP | 3,662 | $55.3K | 0.00% | +1,377+60.3% | Added |
| State of Wyoming | 3,571 | $53.9K | 0.01% | −14,393−80.1% | Reduced |
| International Assets Investment Management, LLC | 3,380 | $53.2K | 0.00% | +3,365+22,433.3% | Added |
| Creative Financial Designs Inc | 3,431 | $51.8K | 0.00% | 00.0% | Unchanged |
| Advisor Group Holdings, Inc. | 3,111 | $46.9K | 0.00% | +523+20.2% | Added |
| Pinnacle Wealth Planning Services, Inc. | 3,086 | $46.6K | 0.00% | +13+0.4% | Added |
| Tower Research Capital LLC (TRC) | 2,994 | $45.2K | 0.00% | −6,153−67.3% | Reduced |
| Farther Finance Advisors, LLC | 2,863 | $43.3K | 0.00% | −258−8.3% | Reduced |
| Stonehage Fleming Financial Services Holdings Ltd | 2,551 | $38.5K | 0.00% | 00.0% | Unchanged |
| KBC Group NV | 2,011 | $30.0K | 0.00% | 00.0% | Unchanged |
| US Bancorp | 1,797 | $27.1K | 0.00% | −412−18.7% | Reduced |
| Assetmark, Inc | 1,750 | $26.4K | 0.00% | 00.0% | Unchanged |