Tandem Diabetes CareTNDM
13F holders, Q2 2026 (June 30)274holders
45new positions
46sold out
6famous investors
$15.10avg. 13F price*
At the end of Q2 2026, 274 institutions reported holding Tandem Diabetes Care Inc. (TNDM) in their 13F filings, unchanged from Q1 2026. 45 opened new positions and 46 sold out. The largest holders were BlackRock, Inc. ($174.8M), Sessa Capital IM, L.P. ($77.0M) and Vanguard Portfolio Management LLC ($64.9M). 6 famous investors held it, including Paul Tudor Jones (0.0% of Tudor Investment Corporation's portfolio), Ken Griffin (0.0% of Citadel Advisors's portfolio) and Steve Cohen (0.0% of Point72 Asset Management's portfolio).
- Company
- Tandem Diabetes Care Inc.
- CUSIP
- 875372203
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q1 2026 → Q2 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 45 | $55.9M |
| Exits | 46 | $84.9M |
All 13F filers, Q1 2026 → Q2 2026: 14,966,428 shares bought and 14,903,323 shares sold, net +63,105 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 274 holders
| BlackRock, Inc. | 0.00% | Add +8.3% | 11,583,125 | $174.8M |
| Sessa Capital IM, L.P. | 1.33% | Add +7.8% | 5,100,000 | $77.0M |
| Vanguard Portfolio Management LLC | 0.00% | Add +7.7% | 4,299,667 | $64.9M |
| First Light Asset Management, LLC | 3.10% | Add +157.4% | 3,383,553 | $51.1M |
| Vanguard Capital Management LLC | 0.00% | Add +1.9% | 3,096,536 | $46.7M |
| State Street Corp. | 0.00% | Add +7.1% | 2,851,646 | $43.0M |
| GW&K Investment Management, LLC | 0.30% | Reduce -4.5% | 2,569,032 | $38.8M |
| Jennison Associates LLC | 0.02% | Add +40.6% | 2,331,429 | $35.2M |
| Paradice Investment Management LLC | 4.87% | Reduce -0.9% | 2,024,014 | $30.5M |
| Jacobs Levy Equity Management, Inc. | 0.11% | Add +31.7% | 2,006,429 | $30.3M |
| Freestone Grove Partners LP | 0.18% | Add +40.2% | 1,866,134 | $28.2M |
| Geode Capital Management, LLC | 0.00% | Add +7.2% | 1,800,797 | $27.2M |
| Driehaus Capital Management LLC | 0.16% | Reduce -22.4% | 1,786,996 | $27.0M |
| Citadel Advisors | 0.02% | Reduce -20.8% | 1,735,879 | $26.2M |
| Millennium Management | 0.01% | Add +72.2% | 1,311,739 | $19.8M |
| Woodline Partners LP | 0.06% | New | 1,307,439 | $19.7M |
| ArrowMark Colorado Holdings LLC | 0.82% | Reduce -58.1% | 1,299,586 | $19.6M |
| UBS Group AG | 0.00% | Reduce -44.0% | 1,146,580 | $17.3M |
| FMR LLC | 0.00% | Add +36.8% | 976,432 | $14.7M |
| Royce & Associates LP | 0.11% | Add +29.3% | 900,590 | $13.6M |
| Wellington Management Group LLP | 0.00% | Reduce -16.4% | 871,811 | $13.2M |
| Goldman Sachs Group Inc. | 0.00% | Reduce -61.1% | 862,301 | $13.0M |
| Northern Trust Corp. | 0.00% | Add +6.7% | 753,690 | $11.4M |
| Verition Fund Management LLC | 0.08% | Add +553.5% | 700,000 | $10.6M |
| ExodusPoint Capital Management, LP | 0.10% | Add +9.3% | 691,789 | $10.4M |
| Qube Research & Technologies Ltd | 0.01% | Add +1216.0% | 683,823 | $10.3M |
| D. E. Shaw & Co. | 0.01% | Reduce -13.0% | 681,808 | $10.3M |
| Arrowstreet Capital, Limited Partnership | 0.00% | Add +245.0% | 667,689 | $10.1M |
| Charles Schwab Investment Management Inc. | 0.00% | Add +2.2% | 656,836 | $9.9M |
| Morgan Stanley | 0.00% | Reduce -52.3% | 647,069 | $9.8M |
| Point72 Asset Management | 0.01% | Add +45.3% | 610,903 | $9.2M |
| Soleus Capital Management, L.P. | 0.30% | Reduce -26.6% | 575,000 | $8.7M |
| Bank of Montreal | 0.00% | Add +1409.2% | 564,966 | $8.5M |
| Two Sigma Investments, LP | 0.01% | Reduce -70.0% | 558,409 | $8.4M |
| AQR Capital Management | 0.00% | Add +60.8% | 533,837 | $8.1M |
| Vanguard Fiduciary Trust Co. | 0.00% | Add +4.1% | 491,103 | $7.4M |
| Aberdeen Group plc | 0.01% | Add +1.8% | 441,738 | $6.7M |
| Jump Financial, LLC | 0.06% | New | 404,400 | $6.1M |
| Bank of America Corp. | 0.00% | Add +5.8% | 395,054 | $6.0M |
| Frontier Capital Management Co. LLC | 0.05% | Reduce -4.2% | 380,458 | $5.7M |
| JPMorgan Chase & Co. | 0.00% | Reduce -0.0% | 349,652 | $5.5M |
| Tudor Investment Corporation | 0.02% | Add +359.1% | 362,708 | $5.5M |
| DAFNA Capital Management LLC | 1.02% | No change | 355,208 | $5.4M |
| Bank of New York Mellon Corp | 0.00% | Add +4.7% | 352,161 | $5.3M |
| Barclays PLC | 0.00% | Reduce -16.8% | 350,429 | $5.3M |
| Principal Financial Group Inc. | 0.00% | Add +1.1% | 335,094 | $5.1M |
| Invesco Ltd. | 0.00% | Add +9.2% | 321,128 | $4.8M |
| Y-Intercept (Hong Kong) Ltd | 0.09% | Add +304.0% | 314,653 | $4.7M |
| Alberta Investment Management Corp | 0.03% | New | 313,700 | $4.7M |
| Edmond DE Rothschild Holding S.A. | 0.06% | Add +19.4% | 308,200 | $4.7M |
| Quantinno Capital Management LP | 0.01% | Reduce -53.1% | 306,660 | $4.6M |
| KVP Capital Advisors, LP | 3.33% | New | 301,000 | $4.5M |
| Meridiem Capital Partners LP | 0.21% | New | 298,255 | $4.5M |
| First Trust Advisors LP | 0.00% | Reduce -14.6% | 292,844 | $4.4M |
| Holocene Advisors, LP | 0.01% | Reduce -43.9% | 267,860 | $4.0M |
| Sector Gamma As | 0.87% | No change | 267,091 | $4.0M |
| Beaconlight Capital, LLC | 1.77% | Add +4.8% | 266,009 | $4.0M |
| Envestnet Asset Management Inc. | 0.00% | Reduce -3.0% | 235,966 | $3.6M |
| Algert Global LLC | 0.04% | Add +100.1% | 235,739 | $3.6M |
| Public Sector Pension Investment Board | 0.01% | Reduce -2.9% | 235,458 | $3.6M |
| Royal Bank of Canada | 0.00% | Add +9.3% | 225,174 | $3.4M |
| Squarepoint Ops LLC | 0.01% | New | 217,386 | $3.3M |
| XTX Topco Ltd | 0.04% | Add +250.2% | 212,976 | $3.2M |
| Connor, Clark & Lunn Investment Management Ltd. | 0.01% | New | 184,073 | $2.8M |
| Jefferies Financial Group Inc. | 0.02% | Add +193.5% | 166,489 | $2.5M |
| Rhumbline Advisers | 0.00% | Reduce -11.9% | 164,053 | $2.5M |
| Nierenberg Investment Management Company, LLC | 1.19% | Add +99.9% | 158,910 | $2.4M |
| Nuveen, LLC | 0.00% | Reduce -56.8% | 157,066 | $2.4M |
| Legal & General Group Plc | 0.00% | Add +0.3% | 155,749 | $2.4M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Reduce -9.9% | 151,847 | $2.3M |
| Russell Investments Group, Ltd. | 0.00% | Add +11.2% | 148,584 | $2.2M |
| Banco Santander, S.A. | 0.01% | Add +974.5% | 147,200 | $2.2M |
| Voya Investment Management LLC | 0.00% | Reduce -82.3% | 142,597 | $2.2M |
| Mizuho Markets Americas LLC | 0.04% | Reduce -12.5% | 137,762 | $2.1M |
| Swiss National Bank | 0.00% | Add +3.1% | 137,500 | $2.1M |
| Acadian Asset Management LLC | 0.00% | Reduce -50.6% | 137,237 | $2.1M |
| Schonfeld Strategic Advisors LLC | 0.01% | New | 129,567 | $2.0M |
| Federated Hermes, Inc. | 0.00% | No change | 123,819 | $1.9M |
| Raymond James Financial Inc. | 0.00% | Reduce -2.6% | 122,021 | $1.8M |
| Susquehanna International Group, LLP | 0.00% | Add +46.1% | 117,958 | $1.8M |
| Ameriprise Financial Inc. | 0.00% | Reduce -6.3% | 113,522 | $1.7M |
| Banque Pictet & Cie SA | 0.02% | Reduce -9.4% | 112,335 | $1.7M |
| Gabelli Funds LLC | 0.01% | Add +312.0% | 103,000 | $1.6M |
| Trexquant Investment LP | 0.01% | Reduce -63.9% | 90,058 | $1.4M |
| Alliancebernstein L.P. | 0.00% | Reduce -4.2% | 70,049 | $1.3M |
| T. Rowe Price Associates Inc. | 0.00% | Add +28.6% | 88,316 | $1.3M |
| Cinctive Capital Management LP | 0.05% | Add +36.2% | 86,906 | $1.3M |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 0.00% | Reduce -2.8% | 84,904 | $1.3M |
| Fideuram - Intesa Sanpaolo Private Banking S.P.A. | 0.04% | New | 84,862 | $1.3M |
| Intech Investment Management LLC | 0.01% | Reduce -27.2% | 81,071 | $1.2M |
| California State Teachers Retirement System | 0.00% | Reduce -8.3% | 77,227 | $1.2M |
| Cerity Partners LLC | 0.00% | Reduce -0.1% | 76,122 | $1.1M |
| Deutsche Bank AG | 0.00% | Add +24.0% | 75,155 | $1.1M |
| Wells Fargo & Company | 0.00% | Add +128.9% | 72,181 | $1.1M |
| Jones Financial Companies LLLP | 0.00% | Add +13.5% | 66,267 | $1.1M |
| Prudential Financial Inc. | 0.00% | Add +1.5% | 70,474 | $1.1M |
| Formula Growth Ltd. | 0.37% | Reduce -0.7% | 70,304 | $1.1M |
| Susquehanna Portfolio Strategies, LLC | 0.02% | Reduce -66.6% | 68,897 | $1.0M |
| New York State Teachers Retirement System | 0.00% | Add +3.3% | 68,300 | $1.0M |
| Stifel Financial Corp. | 0.00% | Add +153.1% | 68,185 | $1.0M |
"% of holder's portfolio" is TNDM's weight in each manager's 13F, not the share of Tandem Diabetes Care Inc. the manager owns.