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 |
|---|---|---|---|---|---|
| BlackRock, Inc. | 10,690,844 | $204.9M | 0.00% | −458,337−4.1% | Reduced |
| Sessa Capital IM, L.P. | 4,730,757 | $90.7M | 1.73% | −269,243−5.4% | Reduced |
| Vanguard Portfolio Management LLC | 3,993,333 | $76.6M | 0.00% | +3,993,333 | New |
| ArrowMark Colorado Holdings LLC | 3,103,609 | $59.5M | 1.58% | +213,918+7.4% | Added |
| Vanguard Capital Management LLC | 3,038,919 | $58.3M | 0.00% | +3,038,919 | New |
| GW&K Investment Management, LLC | 2,689,106 | $51.5M | 0.45% | +13,949+0.5% | Added |
| State Street Corp | 2,662,260 | $51.0M | 0.00% | +20,536+0.8% | Added |
| Driehaus Capital Management LLC | 2,304,414 | $44.2M | 0.32% | +694,072+43.1% | Added |
| Goldman Sachs Group Inc | 2,218,922 | $42.5M | 0.01% | +535,522+31.8% | Added |
| Citadel Advisors LLC | 2,192,667 | $42.0M | 0.03% | +104,064+5.0% | Added |
| UBS Group AG | 2,047,801 | $39.3M | 0.01% | +1,629,968+390.1% | Added |
| Paradice Investment Management LLC | 2,042,425 | $39.2M | 7.43% | −35,320−1.7% | Reduced |
| Two Sigma Investments, LP | 1,864,194 | $35.7M | 0.03% | +662,667+55.2% | Added |
| Geode Capital Management, LLC | 1,679,863 | $32.2M | 0.00% | +30,480+1.8% | Added |
| Jennison Associates LLC | 1,658,448 | $31.8M | 0.02% | −362,928−18.0% | Reduced |
| Jacobs Levy Equity Management, Inc | 1,523,946 | $29.2M | 0.12% | −129,762−7.8% | Reduced |
| Marshall Wace, LLP | 1,442,472 | $27.7M | 0.03% | +566,941+64.8% | Added |
| Morgan Stanley | 1,357,542 | $26.0M | 0.00% | −722,955−34.7% | Reduced |
| Freestone Grove Partners LP | 1,330,742 | $25.5M | 0.18% | −112,094−7.8% | Reduced |
| First Light Asset Management, LLC | 1,314,715 | $25.2M | 2.26% | +225,222+20.7% | Added |
| Baillie Gifford & Co | 1,089,393 | $20.9M | 0.02% | −56,123−4.9% | Reduced |
| Wellington Management Group LLP | 1,042,764 | $20.0M | 0.00% | +944,455+960.7% | Added |
| Voya Investment Management LLC | 804,137 | $15.4M | 0.02% | +484,609+151.7% | Added |
| D. E. Shaw & Co., Inc. | 783,906 | $15.0M | 0.01% | −70,360−8.2% | Reduced |
| Soleus Capital Management, L.P. | 783,000 | $15.0M | 0.61% | +783,000 | New |
| Defilade Capital Management, L.P. | 761,905 | $14.6M | 2.05% | +761,905 | New |
| Millennium Management LLC | 761,672 | $14.6M | 0.01% | +178,099+30.5% | Added |
| FMR LLC | 714,011 | $13.7M | 0.00% | +41,364+6.1% | Added |
| Northern Trust Corp | 706,609 | $13.5M | 0.00% | +14,916+2.2% | Added |
| Royce & Associates LP | 696,590 | $13.4M | 0.13% | +46,340+7.1% | Added |
| Quantinno Capital Management LP | 653,870 | $12.5M | 0.02% | +361,361+123.5% | Added |
| Charles Schwab Investment Management Inc | 642,598 | $12.3M | 0.00% | −3,712−0.6% | Reduced |
| ExodusPoint Capital Management, LP | 632,899 | $12.1M | 0.12% | +632,899 | New |
| Holocene Advisors, LP | 477,359 | $9.15M | 0.02% | +460,941+2,807.5% | Added |
| Vanguard Fiduciary Trust Co | 471,658 | $9.04M | 0.00% | +471,658 | New |
| Standard Life Aberdeen plc | 434,027 | $8.32M | 0.01% | −113,008−20.7% | Reduced |
| Barclays PLC | 421,236 | $8.08M | 0.00% | −496,691−54.1% | Reduced |
| Point72 Asset Management, L.P. | 420,478 | $8.06M | 0.01% | +420,478 | New |
| Frontier Capital Management Co LLC | 397,209 | $7.61M | 0.08% | −15,060−3.7% | Reduced |
| Bank of America Corp | 373,224 | $7.15M | 0.00% | −329,279−46.9% | Reduced |
| Nuveen, LLC | 363,802 | $6.97M | 0.00% | −199,472−35.4% | Reduced |
| JPMorgan Chase & Co | 349,792 | $6.85M | 0.00% | +8,161+2.4% | Added |
| DAFNA Capital Management LLC | 355,208 | $6.81M | 1.55% | 00.0% | Unchanged |
| First Trust Advisors LP | 342,707 | $6.57M | 0.00% | +342,707 | New |
| Bank of New York Mellon Corp | 336,291 | $6.45M | 0.00% | −13,462−3.8% | Reduced |
| AQR Capital Management LLC | 331,916 | $6.36M | 0.00% | −7,663−2.3% | Reduced |
| Principal Financial Group Inc | 331,541 | $6.36M | 0.00% | +7,279+2.2% | Added |
| Invesco Ltd. | 294,052 | $5.64M | 0.00% | +16,330+5.9% | Added |
| Acadian Asset Management LLC | 278,116 | $5.32M | 0.01% | −114,647−29.2% | Reduced |
| Sector Gamma AS | 267,091 | $5.12M | 1.21% | 00.0% | Unchanged |
| Edmond de Rothschild Holding S.A. | 258,200 | $4.95M | 0.07% | 00.0% | Unchanged |
| Beaconlight Capital, LLC | 253,877 | $4.87M | 2.74% | +253,877 | New |
| Trexquant Investment LP | 249,298 | $4.78M | 0.03% | +146,579+142.7% | Added |
| Envestnet Asset Management Inc | 243,248 | $4.66M | 0.00% | +21,594+9.7% | Added |
| Public Sector Pension Investment Board | 242,596 | $4.65M | 0.01% | +7,923+3.4% | Added |
| BNP Paribas Arbitrage, SA | 208,713 | $4.00M | 0.00% | −1,039,768−83.3% | Reduced |
| Susquehanna Portfolio Strategies, LLC | 206,193 | $3.95M | 0.06% | +139,741+210.3% | Added |
| Royal Bank of Canada | 206,033 | $3.95M | 0.00% | −2,495−1.2% | Reduced |
| Arrowstreet Capital, Limited Partnership | 193,556 | $3.71M | 0.00% | +57,803+42.6% | Added |
| Rhumbline Advisers | 186,316 | $3.57M | 0.00% | +2,097+1.1% | Added |
| Assenagon Asset Management S.A. | 178,640 | $3.42M | 0.01% | −1,049,216−85.5% | Reduced |
| UBS Asset Management Americas Inc | 168,493 | $3.23M | 0.00% | +3,591+2.2% | Added |
| Lisanti Capital Growth, LLC | 165,325 | $3.17M | 0.80% | −97,560−37.1% | Reduced |
| Panagora Asset Management Inc | 163,695 | $3.14M | 0.01% | +17,461+11.9% | Added |
| Mizuho Markets Americas LLC | 157,362 | $3.02M | 0.08% | +12,745+8.8% | Added |
| Legal & General Group Plc | 155,288 | $2.98M | 0.00% | −16,573−9.6% | Reduced |
| Toronto Dominion Bank | 150,078 | $2.88M | 0.01% | +150,078 | New |
| Russell Investments Group, Ltd. | 133,596 | $2.56M | 0.00% | +4,936+3.8% | Added |
| Swiss National Bank | 133,300 | $2.56M | 0.00% | 00.0% | Unchanged |
| Raymond James Financial Inc | 125,345 | $2.40M | 0.00% | +5,176+4.3% | Added |
| Banque Pictet & Cie SA | 123,935 | $2.38M | 0.03% | +26,748+27.5% | Added |
| Federated Hermes, Inc. | 123,819 | $2.37M | 0.00% | +123,794+495,176.0% | Added |
| Ameriprise Financial Inc | 121,150 | $2.32M | 0.00% | −7,570−5.9% | Reduced |
| Canada Pension Plan Investment Board | 118,439 | $2.27M | 0.00% | −59,161−33.3% | Reduced |
| Algert Global LLC | 117,799 | $2.26M | 0.03% | +8,860+8.1% | Added |
| Intech Investment Management LLC | 111,421 | $2.14M | 0.02% | +84,050+307.1% | Added |
| Verition Fund Management LLC | 107,119 | $2.05M | 0.02% | +96,532+911.8% | Added |
| SEI Investments Co | 95,306 | $1.83M | 0.00% | −11,292−10.6% | Reduced |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 94,340 | $1.81M | 0.00% | +20,325+27.5% | Added |
| PDT Partners, LLC | 93,805 | $1.80M | 0.11% | −16,580−15.0% | Reduced |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 87,357 | $1.67M | 0.00% | −1,737−1.9% | Reduced |
| California State Teachers Retirement System | 84,255 | $1.62M | 0.00% | +19,844+30.8% | Added |
| Alliancebernstein L.P. | 73,149 | $1.61M | 0.00% | −161,144−68.8% | Reduced |
| Susquehanna International Group, LLP | 80,749 | $1.55M | 0.00% | −49,572−38.0% | Reduced |
| Nierenberg Investment Management Company, Inc. | 79,510 | $1.52M | 0.76% | +34,955+78.5% | Added |
| Tudor Investment Corp Et Al | 78,999 | $1.51M | 0.01% | −29,064−26.9% | Reduced |
| Y-Intercept (Hong Kong) Ltd | 77,879 | $1.49M | 0.03% | −6,107−7.3% | Reduced |
| Cerity Partners LLC | 76,228 | $1.46M | 0.00% | −543−0.7% | Reduced |
| Rice Hall James & Associates, LLC | 72,878 | $1.40M | 0.08% | +10,463+16.8% | Added |
| Formula Growth Ltd | 70,828 | $1.36M | 0.61% | −91−0.1% | Reduced |
| Prudential Financial Inc | 69,404 | $1.33M | 0.00% | +4,390+6.8% | Added |
| Price T Rowe Associates Inc | 68,661 | $1.32M | 0.00% | +11,852+20.9% | Added |
| Citigroup Inc | 68,346 | $1.31M | 0.00% | +49,978+272.1% | Added |
| New York State Teachers Retirement System | 66,096 | $1.27M | 0.00% | −2,204−3.2% | Reduced |
| Jones Financial Companies LLLP | 58,388 | $1.23M | 0.00% | +56,826+3,638.0% | Added |
| Cinctive Capital Management LP | 63,812 | $1.22M | 0.08% | +63,812 | New |
| Natixis Advisors, L.P. | 61,084 | $1.17M | 0.00% | +4,063+7.1% | Added |
| XTX Topco Ltd | 60,821 | $1.17M | 0.02% | +60,821 | New |
| Deutsche Bank AG | 60,629 | $1.16M | 0.00% | +6,399+11.8% | Added |
| Vanguard Asset Management, Ltd | 58,288 | $1.12M | 0.00% | +58,288 | New |