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 |
|---|---|---|---|---|---|
| Mizuho Markets Americas LLC | 137,762 | $2.08M | 0.04% | −19,600−12.5% | Reduced |
| Voya Investment Management LLC | 142,597 | $2.15M | 0.00% | −661,540−82.3% | Reduced |
| Banco Santander, S.A. | 147,200 | $2.22M | 0.01% | +133,500+974.5% | Added |
| Russell Investments Group, Ltd. | 148,584 | $2.24M | 0.00% | +14,988+11.2% | Added |
| UBS Asset Management Americas Inc | 151,847 | $2.29M | 0.00% | −16,646−9.9% | Reduced |
| Legal & General Group Plc | 155,749 | $2.35M | 0.00% | +461+0.3% | Added |
| Nuveen, LLC | 157,066 | $2.37M | 0.00% | −206,736−56.8% | Reduced |
| Nierenberg Investment Management Company, Inc. | 158,910 | $2.40M | 1.19% | +79,400+99.9% | Added |
| Rhumbline Advisers | 164,053 | $2.48M | 0.00% | −22,263−11.9% | Reduced |
| Jefferies Financial Group Inc. | 166,489 | $2.51M | 0.02% | +109,767+193.5% | Added |
| Connor, Clark & Lunn Investment Management Ltd. | 184,073 | $2.78M | 0.01% | +184,073 | New |
| XTX Topco Ltd | 212,976 | $3.21M | 0.04% | +152,155+250.2% | Added |
| Squarepoint Ops LLC | 217,386 | $3.28M | 0.01% | +217,386 | New |
| Royal Bank of Canada | 225,174 | $3.40M | 0.00% | +19,141+9.3% | Added |
| Public Sector Pension Investment Board | 235,458 | $3.55M | 0.01% | −7,138−2.9% | Reduced |
| Algert Global LLC | 235,739 | $3.56M | 0.04% | +117,940+100.1% | Added |
| Envestnet Asset Management Inc | 235,966 | $3.56M | 0.00% | −7,282−3.0% | Reduced |
| Beaconlight Capital, LLC | 266,009 | $4.01M | 1.77% | +12,132+4.8% | Added |
| Sector Gamma AS | 267,091 | $4.03M | 0.87% | 00.0% | Unchanged |
| Holocene Advisors, LP | 267,860 | $4.04M | 0.01% | −209,499−43.9% | Reduced |
| First Trust Advisors LP | 292,844 | $4.42M | 0.00% | −49,863−14.5% | Reduced |
| Meridiem Capital Partners LP | 298,255 | $4.50M | 0.21% | +298,255 | New |
| KVP Capital Advisors, LP | 301,000 | $4.54M | 3.33% | +301,000 | New |
| Quantinno Capital Management LP | 306,660 | $4.63M | 0.01% | −347,210−53.1% | Reduced |
| Edmond de Rothschild Holding S.A. | 308,200 | $4.65M | 0.06% | +50,000+19.4% | Added |
| Alberta Investment Management Corp | 313,700 | $4.73M | 0.03% | +313,700 | New |
| Y-Intercept (Hong Kong) Ltd | 314,653 | $4.75M | 0.09% | +236,774+304.0% | Added |
| Invesco Ltd. | 321,128 | $4.85M | 0.00% | +27,076+9.2% | Added |
| Principal Financial Group Inc | 335,094 | $5.06M | 0.00% | +3,553+1.1% | Added |
| Barclays PLC | 350,429 | $5.29M | 0.00% | −70,807−16.8% | Reduced |
| Bank of New York Mellon Corp | 352,161 | $5.31M | 0.00% | +15,870+4.7% | Added |
| DAFNA Capital Management LLC | 355,208 | $5.36M | 1.02% | 00.0% | Unchanged |
| Tudor Investment Corp Et Al | 362,708 | $5.47M | 0.02% | +283,709+359.1% | Added |
| JPMorgan Chase & Co | 349,652 | $5.53M | 0.00% | −1400.0% | Reduced |
| Frontier Capital Management Co LLC | 380,458 | $5.74M | 0.05% | −16,751−4.2% | Reduced |
| Bank of America Corp | 395,054 | $5.96M | 0.00% | +21,830+5.8% | Added |
| Jump Financial, LLC | 404,400 | $6.10M | 0.05% | +404,400 | New |
| Standard Life Aberdeen plc | 441,738 | $6.67M | 0.01% | +7,711+1.8% | Added |
| Vanguard Fiduciary Trust Co | 491,103 | $7.41M | 0.00% | +19,445+4.1% | Added |
| AQR Capital Management LLC | 533,837 | $8.06M | 0.00% | +201,921+60.8% | Added |
| Two Sigma Investments, LP | 558,409 | $8.43M | 0.01% | −1,305,785−70.0% | Reduced |
| Bank of Montreal | 564,966 | $8.53M | 0.00% | +527,531+1,409.2% | Added |
| Soleus Capital Management, L.P. | 575,000 | $8.68M | 0.30% | −208,000−26.6% | Reduced |
| Point72 Asset Management, L.P. | 610,903 | $9.22M | 0.01% | +190,425+45.3% | Added |
| Morgan Stanley | 647,069 | $9.76M | 0.00% | −710,473−52.3% | Reduced |
| Charles Schwab Investment Management Inc | 656,836 | $9.91M | 0.00% | +14,238+2.2% | Added |
| Arrowstreet Capital, Limited Partnership | 667,689 | $10.1M | 0.00% | +474,133+245.0% | Added |
| D. E. Shaw & Co., Inc. | 681,808 | $10.3M | 0.01% | −102,098−13.0% | Reduced |
| Qube Research & Technologies Ltd | 683,823 | $10.3M | 0.01% | +631,862+1,216.0% | Added |
| ExodusPoint Capital Management, LP | 691,789 | $10.4M | 0.10% | +58,890+9.3% | Added |
| Verition Fund Management LLC | 700,000 | $10.6M | 0.07% | +592,881+553.5% | Added |
| Northern Trust Corp | 753,690 | $11.4M | 0.00% | +47,081+6.7% | Added |
| Goldman Sachs Group Inc | 862,301 | $13.0M | 0.00% | −1,356,621−61.1% | Reduced |
| Wellington Management Group LLP | 871,811 | $13.2M | 0.00% | −170,953−16.4% | Reduced |
| Royce & Associates LP | 900,590 | $13.6M | 0.11% | +204,000+29.3% | Added |
| FMR LLC | 976,432 | $14.7M | 0.00% | +262,421+36.8% | Added |
| UBS Group AG | 1,146,580 | $17.3M | 0.00% | −901,221−44.0% | Reduced |
| ArrowMark Colorado Holdings LLC | 1,299,586 | $19.6M | 0.82% | −1,804,023−58.1% | Reduced |
| Woodline Partners LP | 1,307,439 | $19.7M | 0.06% | +1,307,439 | New |
| Millennium Management LLC | 1,311,739 | $19.8M | 0.01% | +550,067+72.2% | Added |
| Citadel Advisors LLC | 1,735,879 | $26.2M | 0.02% | −456,788−20.8% | Reduced |
| Driehaus Capital Management LLC | 1,786,996 | $27.0M | 0.16% | −517,418−22.5% | Reduced |
| Geode Capital Management, LLC | 1,800,797 | $27.2M | 0.00% | +120,934+7.2% | Added |
| Freestone Grove Partners LP | 1,866,134 | $28.2M | 0.18% | +535,392+40.2% | Added |
| Jacobs Levy Equity Management, Inc | 2,006,429 | $30.3M | 0.11% | +482,483+31.7% | Added |
| Paradice Investment Management LLC | 2,024,014 | $30.5M | 4.87% | −18,411−0.9% | Reduced |
| Jennison Associates LLC | 2,331,429 | $35.2M | 0.02% | +672,981+40.6% | Added |
| GW&K Investment Management, LLC | 2,569,032 | $38.8M | 0.30% | −120,074−4.5% | Reduced |
| State Street Corp | 2,851,646 | $43.0M | 0.00% | +189,386+7.1% | Added |
| Vanguard Capital Management LLC | 3,096,536 | $46.7M | 0.00% | +57,617+1.9% | Added |
| First Light Asset Management, LLC | 3,383,553 | $51.1M | 3.10% | +2,068,838+157.4% | Added |
| Vanguard Portfolio Management LLC | 4,299,667 | $64.9M | 0.00% | +306,334+7.7% | Added |
| Sessa Capital IM, L.P. | 5,100,000 | $77.0M | 1.33% | +369,243+7.8% | Added |
| BlackRock, Inc. | 11,583,125 | $174.8M | 0.00% | +892,281+8.3% | Added |
| Marshall Wace, LLP | 0 | $0 | 0.00% | −1,442,472−100.0% | Sold out |
| Baillie Gifford & Co | 0 | $0 | 0.00% | −1,089,393−100.0% | Sold out |
| Defilade Capital Management, L.P. | 0 | $0 | 0.00% | −761,905−100.0% | Sold out |
| Lisanti Capital Growth, LLC | 0 | $0 | 0.00% | −165,325−100.0% | Sold out |
| Panagora Asset Management Inc | 0 | $0 | 0.00% | −163,695−100.0% | Sold out |
| Toronto Dominion Bank | 0 | $0 | 0.00% | −150,078−100.0% | Sold out |
| Canada Pension Plan Investment Board | 0 | $0 | 0.00% | −118,439−100.0% | Sold out |
| Rice Hall James & Associates, LLC | 0 | $0 | 0.00% | −72,878−100.0% | Sold out |
| Renaissance Technologies LLC | 0 | $0 | 0.00% | −58,227−100.0% | Sold out |
| Twinbeech Capital LP | 0 | $0 | 0.00% | −51,366−100.0% | Sold out |
| Legato Capital Management LLC | 0 | $0 | 0.00% | −50,085−100.0% | Sold out |
| Ieq Capital, LLC | 0 | $0 | 0.00% | −39,007−100.0% | Sold out |
| American Century Companies Inc | 0 | $0 | 0.00% | −33,470−100.0% | Sold out |
| Dynamic Technology Lab Private Ltd | 0 | $0 | 0.00% | −27,886−100.0% | Sold out |
| VARCOV Co. | 0 | $0 | 0.00% | −26,562−100.0% | Sold out |
| Diversified Trust Co | 0 | $0 | 0.00% | −21,332−100.0% | Sold out |
| Colony Group, LLC | 0 | $0 | 0.00% | −17,534−100.0% | Sold out |
| Allianz Asset Management GmbH | 0 | $0 | 0.00% | −16,900−100.0% | Sold out |
| Evergreen Capital Management LLC | 0 | $0 | 0.00% | −12,992−100.0% | Sold out |
| Counterpoint Mutual Funds LLC | 0 | $0 | 0.00% | −12,679−100.0% | Sold out |
| DRW Securities, LLC | 0 | $0 | 0.00% | −12,419−100.0% | Sold out |
| EP Wealth Advisors, LLC | 0 | $0 | 0.00% | −11,886−100.0% | Sold out |
| Syon Capital LLC | 0 | $0 | 0.00% | −11,437−100.0% | Sold out |
| Park Avenue Securities LLC | 0 | $0 | 0.00% | −10,647−100.0% | Sold out |
| ProShare Advisors LLC | 0 | $0 | 0.00% | −10,554−100.0% | Sold out |
| Apollon Wealth Management, LLC | 0 | $0 | 0.00% | −10,534−100.0% | Sold out |