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; 291 institutions reported holding it in 13F filings for Q2 2026, worth $1.49B 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
- 291
- +13 vs. Q1 2026
- Shares held
- 79.0M
- +423.7K (+0.5%) vs. Q1 2026
- Total value
- $1.49B
- −$334.1M (−18.3%) vs. Q1 2026
- New holders
- 59
- 95 more added
- Sold out
- 46
- 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 | 291 | $1.49B |
| Q1 2026 | 281 | $1.82B |
| Q4 2025 | 285 | $1.97B |
| Q3 2025 | 267 | $1.20B |
| Q2 2025 | 285 | $1.83B |
| Q1 2025 | 291 | $1.71B |
| Q4 2024 | 315 | $2.60B |
| Q3 2024 | 331 | $3.11B |
| Q2 2024 | 316 | $2.97B |
| Q1 2024 | 291 | $2.73B |
| Q4 2023 | 268 | $2.13B |
| Q3 2023 | 226 | $1.45B |
| Q2 2023 | 247 | $1.65B |
| Q1 2023 | 274 | $3.10B |
| Q4 2022 | 295 | $2.89B |
| Q3 2022 | 299 | $3.04B |
| Q2 2022 | 331 | $3.67B |
| Q1 2022 | 379 | $6.98B |
| Q4 2021 | 388 | $9.12B |
| Q3 2021 | 338 | $7.32B |
| Q2 2021 | 303 | $5.77B |
| 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 |
|---|---|---|---|---|---|
| BlackRock, Inc. | 11,583,125 | $181.4M | 0.00% | +892,281+8.3% | Added |
| Sessa Capital IM, L.P. | 5,100,000 | $77.0M | 1.33% | +369,243+7.8% | Added |
| Linden Advisors LP | – | $71.2M | 0.37% | – | – |
| Vanguard Portfolio Management LLC | 4,299,667 | $64.9M | 0.00% | +306,334+7.7% | Added |
| First Light Asset Management, LLC | 3,383,553 | $51.1M | 3.10% | +2,068,838+157.4% | Added |
| Bank of Montreal | 564,966 | $48.6M | 0.02% | +527,531+1,409.2% | Added |
| Vanguard Capital Management LLC | 3,096,536 | $46.7M | 0.00% | +57,617+1.9% | Added |
| State Street Corp | 2,851,646 | $43.0M | 0.00% | +189,386+7.1% | Added |
| GW&K Investment Management, LLC | 2,569,032 | $38.8M | 0.30% | −120,074−4.5% | Reduced |
| Jennison Associates LLC | 2,331,429 | $35.2M | 0.02% | +672,981+40.6% | Added |
| Paradice Investment Management LLC | 2,024,014 | $30.5M | 4.87% | −18,411−0.9% | Reduced |
| Jacobs Levy Equity Management, Inc | 2,006,429 | $30.3M | 0.11% | +482,483+31.7% | Added |
| Freestone Grove Partners LP | 1,866,134 | $28.2M | 0.18% | +535,392+40.2% | Added |
| Geode Capital Management, LLC | 1,800,797 | $27.2M | 0.00% | +120,934+7.2% | Added |
| Driehaus Capital Management LLC | 1,786,996 | $27.0M | 0.16% | −517,418−22.5% | Reduced |
| Opti Capital Management, LP | – | $26.4M | 1.61% | – | New |
| Citadel Advisors LLC | 1,735,879 | $26.2M | 0.02% | −456,788−20.8% | Reduced |
| Balyasny Asset Management LLC | – | $23.9M | 0.04% | – | New |
| Goldman Sachs Group Inc | 862,301 | $22.9M | 0.00% | −1,356,621−61.1% | Reduced |
| Millennium Management LLC | 1,311,739 | $19.8M | 0.01% | +550,067+72.2% | Added |
| Woodline Partners LP | 1,307,439 | $19.7M | 0.06% | +1,307,439 | New |
| ArrowMark Colorado Holdings LLC | 1,299,586 | $19.6M | 0.82% | −1,804,023−58.1% | Reduced |
| Context Capital Management, LLC | – | $19.0M | 0.38% | – | – |
| FMR LLC | 976,432 | $18.3M | 0.00% | +262,421+36.8% | Added |
| Empyrean Capital Partners, LP | – | $17.7M | 0.62% | – | New |
| UBS Group AG | 1,146,580 | $17.3M | 0.00% | −901,221−44.0% | Reduced |
| DeepCurrents Investment Group LLC | – | $16.9M | 0.58% | – | – |
| Fort Baker Capital Management LP | – | $14.4M | 1.15% | – | New |
| Jump Financial, LLC | 404,400 | $14.0M | 0.12% | +404,400 | New |
| Royce & Associates LP | 900,590 | $13.6M | 0.11% | +204,000+29.3% | Added |
| Wellington Management Group LLP | 871,811 | $13.2M | 0.00% | −170,953−16.4% | Reduced |
| Northern Trust Corp | 753,690 | $11.4M | 0.00% | +47,081+6.7% | Added |
| Verition Fund Management LLC | 700,000 | $10.6M | 0.07% | +592,881+553.5% | Added |
| ExodusPoint Capital Management, LP | 691,789 | $10.4M | 0.10% | +58,890+9.3% | Added |
| Qube Research & Technologies Ltd | 683,823 | $10.3M | 0.01% | +631,862+1,216.0% | Added |
| D. E. Shaw & Co., Inc. | 681,808 | $10.3M | 0.01% | −102,098−13.0% | Reduced |
| Arrowstreet Capital, Limited Partnership | 667,689 | $10.1M | 0.00% | +474,133+245.0% | Added |
| Charles Schwab Investment Management Inc | 656,836 | $9.91M | 0.00% | +14,238+2.2% | Added |
| Morgan Stanley | 647,069 | $9.76M | 0.00% | −710,473−52.3% | Reduced |
| Point72 Asset Management, L.P. | 610,903 | $9.22M | 0.01% | +190,425+45.3% | Added |
| Soleus Capital Management, L.P. | 575,000 | $8.68M | 0.30% | −208,000−26.6% | Reduced |
| Two Sigma Investments, LP | 558,409 | $8.43M | 0.01% | −1,305,785−70.0% | Reduced |
| Calamos Advisors LLC | – | $8.20M | 0.03% | – | – |
| AQR Capital Management LLC | 533,837 | $8.06M | 0.00% | +201,921+60.8% | Added |
| Vanguard Fiduciary Trust Co | 491,103 | $7.41M | 0.00% | +19,445+4.1% | Added |
| Standard Life Aberdeen plc | 441,738 | $6.67M | 0.01% | +7,711+1.8% | Added |
| Bank of America Corp | 395,054 | $5.96M | 0.00% | +21,830+5.8% | Added |
| Advent Capital Management | – | $5.92M | 0.13% | – | New |
| Frontier Capital Management Co LLC | 380,458 | $5.74M | 0.05% | −16,751−4.2% | Reduced |
| Aristeia Capital LLC | – | $5.70M | 0.09% | – | – |
| Citigroup Inc | 40,230 | $5.58M | 0.00% | −28,116−41.1% | Reduced |
| Bank of New York Mellon Corp | 602,161 | $5.55M | 0.00% | +265,870+79.1% | Added |
| JPMorgan Chase & Co | 349,652 | $5.53M | 0.00% | −1400.0% | Reduced |
| Tudor Investment Corp Et Al | 362,708 | $5.47M | 0.02% | +283,709+359.1% | Added |
| DAFNA Capital Management LLC | 355,208 | $5.36M | 1.02% | 00.0% | Unchanged |
| Barclays PLC | 350,429 | $5.29M | 0.00% | −70,807−16.8% | Reduced |
| Principal Financial Group Inc | 335,094 | $5.06M | 0.00% | +3,553+1.1% | Added |
| Invesco Ltd. | 321,128 | $4.85M | 0.00% | +27,076+9.2% | Added |
| Y-Intercept (Hong Kong) Ltd | 314,653 | $4.75M | 0.09% | +236,774+304.0% | Added |
| Alberta Investment Management Corp | 313,700 | $4.73M | 0.03% | +313,700 | New |
| Edmond de Rothschild Holding S.A. | 308,200 | $4.65M | 0.06% | +50,000+19.4% | Added |
| Quantinno Capital Management LP | 306,660 | $4.63M | 0.01% | −347,210−53.1% | Reduced |
| KVP Capital Advisors, LP | 301,000 | $4.54M | 3.33% | +301,000 | New |
| Meridiem Capital Partners LP | 298,255 | $4.50M | 0.21% | +298,255 | New |
| First Trust Advisors LP | 292,844 | $4.42M | 0.00% | −49,863−14.5% | Reduced |
| Holocene Advisors, LP | 267,860 | $4.04M | 0.01% | −209,499−43.9% | Reduced |
| Sector Gamma AS | 267,091 | $4.03M | 0.87% | 00.0% | Unchanged |
| Beaconlight Capital, LLC | 266,009 | $4.01M | 1.77% | +12,132+4.8% | Added |
| Jefferies Financial Group Inc. | 166,489 | $3.56M | 0.03% | +109,767+193.5% | Added |
| Envestnet Asset Management Inc | 235,966 | $3.56M | 0.00% | −7,282−3.0% | Reduced |
| Algert Global LLC | 235,739 | $3.56M | 0.04% | +117,940+100.1% | Added |
| Public Sector Pension Investment Board | 235,458 | $3.55M | 0.01% | −7,138−2.9% | Reduced |
| Royal Bank of Canada | 225,174 | $3.40M | 0.00% | +19,141+9.3% | Added |
| Walleye Capital LLC | – | $3.33M | 0.02% | – | New |
| Squarepoint Ops LLC | 217,386 | $3.28M | 0.01% | +217,386 | New |
| XTX Topco Ltd | 212,976 | $3.21M | 0.04% | +152,155+250.2% | Added |
| Connor, Clark & Lunn Investment Management Ltd. | 184,073 | $2.78M | 0.01% | +184,073 | New |
| SG Americas Securities, LLC | 8,795 | $2.49M | 0.00% | −24,227−73.4% | Reduced |
| Rhumbline Advisers | 164,053 | $2.48M | 0.00% | −22,263−11.9% | Reduced |
| Nierenberg Investment Management Company, Inc. | 158,910 | $2.40M | 1.19% | +79,400+99.9% | Added |
| Zazove Associates LLC | – | $2.40M | 0.20% | – | New |
| Tenor Capital Management Co., L.P. | – | $2.39M | 0.03% | – | New |
| CSS LLC | – | $2.38M | 0.11% | – | New |
| Capstone Investment Advisors, LLC | – | $2.38M | 0.02% | – | New |
| Nuveen, LLC | 157,066 | $2.37M | 0.00% | −206,736−56.8% | Reduced |
| Legal & General Group Plc | 155,749 | $2.35M | 0.00% | +461+0.3% | Added |
| UBS Asset Management Americas Inc | 151,847 | $2.29M | 0.00% | −16,646−9.9% | Reduced |
| Russell Investments Group, Ltd. | 148,584 | $2.24M | 0.00% | +14,988+11.2% | Added |
| Banco Santander, S.A. | 147,200 | $2.22M | 0.01% | +133,500+974.5% | Added |
| Voya Investment Management LLC | 142,597 | $2.15M | 0.00% | −661,540−82.3% | Reduced |
| Mizuho Markets Americas LLC | 137,762 | $2.08M | 0.04% | −19,600−12.5% | Reduced |
| Swiss National Bank | 137,500 | $2.07M | 0.00% | +4,200+3.2% | Added |
| Acadian Asset Management LLC | 137,237 | $2.06M | 0.00% | −140,879−50.7% | Reduced |
| Schonfeld Strategic Advisors LLC | 129,567 | $1.96M | 0.01% | +129,567 | New |
| Federated Hermes, Inc. | 123,819 | $1.87M | 0.00% | 00.0% | Unchanged |
| Raymond James Financial Inc | 122,021 | $1.84M | 0.00% | −3,324−2.7% | Reduced |
| Susquehanna International Group, LLP | 117,958 | $1.78M | 0.00% | +37,209+46.1% | Added |
| Ameriprise Financial Inc | 113,522 | $1.71M | 0.00% | −7,628−6.3% | Reduced |
| Banque Pictet & Cie SA | 112,335 | $1.70M | 0.02% | −11,600−9.4% | Reduced |
| Cambridge Investment Research Advisors, Inc. | 104,590 | $1.58M | 0.00% | +104,590 | New |