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 |
|---|---|---|---|---|---|
| Canada Pension Plan Investment Board | 118,439 | $2.27M | 0.00% | −59,161−33.3% | Reduced |
| Ameriprise Financial Inc | 121,150 | $2.32M | 0.00% | −7,570−5.9% | Reduced |
| Federated Hermes, Inc. | 123,819 | $2.37M | 0.00% | +123,794+495,176.0% | Added |
| Banque Pictet & Cie SA | 123,935 | $2.38M | 0.03% | +26,748+27.5% | Added |
| Raymond James Financial Inc | 125,345 | $2.40M | 0.00% | +5,176+4.3% | Added |
| Swiss National Bank | 133,300 | $2.56M | 0.00% | 00.0% | Unchanged |
| Russell Investments Group, Ltd. | 133,596 | $2.56M | 0.00% | +4,936+3.8% | Added |
| Toronto Dominion Bank | 150,078 | $2.88M | 0.01% | +150,078 | New |
| Legal & General Group Plc | 155,288 | $2.98M | 0.00% | −16,573−9.6% | Reduced |
| Mizuho Markets Americas LLC | 157,362 | $3.02M | 0.08% | +12,745+8.8% | Added |
| Panagora Asset Management Inc | 163,695 | $3.14M | 0.01% | +17,461+11.9% | Added |
| Lisanti Capital Growth, LLC | 165,325 | $3.17M | 0.80% | −97,560−37.1% | Reduced |
| UBS Asset Management Americas Inc | 168,493 | $3.23M | 0.00% | +3,591+2.2% | Added |
| Assenagon Asset Management S.A. | 178,640 | $3.42M | 0.01% | −1,049,216−85.5% | Reduced |
| Rhumbline Advisers | 186,316 | $3.57M | 0.00% | +2,097+1.1% | Added |
| Arrowstreet Capital, Limited Partnership | 193,556 | $3.71M | 0.00% | +57,803+42.6% | Added |
| Royal Bank of Canada | 206,033 | $3.95M | 0.00% | −2,495−1.2% | Reduced |
| Susquehanna Portfolio Strategies, LLC | 206,193 | $3.95M | 0.06% | +139,741+210.3% | Added |
| BNP Paribas Arbitrage, SA | 208,713 | $4.00M | 0.00% | −1,039,768−83.3% | Reduced |
| Public Sector Pension Investment Board | 242,596 | $4.65M | 0.01% | +7,923+3.4% | Added |
| Envestnet Asset Management Inc | 243,248 | $4.66M | 0.00% | +21,594+9.7% | Added |
| Trexquant Investment LP | 249,298 | $4.78M | 0.03% | +146,579+142.7% | Added |
| Beaconlight Capital, LLC | 253,877 | $4.87M | 2.74% | +253,877 | New |
| Edmond de Rothschild Holding S.A. | 258,200 | $4.95M | 0.07% | 00.0% | Unchanged |
| Sector Gamma AS | 267,091 | $5.12M | 1.21% | 00.0% | Unchanged |
| Acadian Asset Management LLC | 278,116 | $5.32M | 0.01% | −114,647−29.2% | Reduced |
| Invesco Ltd. | 294,052 | $5.64M | 0.00% | +16,330+5.9% | Added |
| Principal Financial Group Inc | 331,541 | $6.36M | 0.00% | +7,279+2.2% | Added |
| AQR Capital Management LLC | 331,916 | $6.36M | 0.00% | −7,663−2.3% | Reduced |
| Bank of New York Mellon Corp | 336,291 | $6.45M | 0.00% | −13,462−3.8% | Reduced |
| First Trust Advisors LP | 342,707 | $6.57M | 0.00% | +342,707 | New |
| DAFNA Capital Management LLC | 355,208 | $6.81M | 1.55% | 00.0% | Unchanged |
| JPMorgan Chase & Co | 349,792 | $6.85M | 0.00% | +8,161+2.4% | Added |
| Nuveen, LLC | 363,802 | $6.97M | 0.00% | −199,472−35.4% | Reduced |
| Bank of America Corp | 373,224 | $7.15M | 0.00% | −329,279−46.9% | Reduced |
| Frontier Capital Management Co LLC | 397,209 | $7.61M | 0.08% | −15,060−3.7% | Reduced |
| Point72 Asset Management, L.P. | 420,478 | $8.06M | 0.01% | +420,478 | New |
| Barclays PLC | 421,236 | $8.08M | 0.00% | −496,691−54.1% | Reduced |
| Standard Life Aberdeen plc | 434,027 | $8.32M | 0.01% | −113,008−20.7% | Reduced |
| Vanguard Fiduciary Trust Co | 471,658 | $9.04M | 0.00% | +471,658 | New |
| Holocene Advisors, LP | 477,359 | $9.15M | 0.02% | +460,941+2,807.5% | Added |
| ExodusPoint Capital Management, LP | 632,899 | $12.1M | 0.12% | +632,899 | New |
| Charles Schwab Investment Management Inc | 642,598 | $12.3M | 0.00% | −3,712−0.6% | Reduced |
| Quantinno Capital Management LP | 653,870 | $12.5M | 0.02% | +361,361+123.5% | Added |
| Royce & Associates LP | 696,590 | $13.4M | 0.13% | +46,340+7.1% | Added |
| Northern Trust Corp | 706,609 | $13.5M | 0.00% | +14,916+2.2% | Added |
| FMR LLC | 714,011 | $13.7M | 0.00% | +41,364+6.1% | Added |
| Millennium Management LLC | 761,672 | $14.6M | 0.01% | +178,099+30.5% | Added |
| Defilade Capital Management, L.P. | 761,905 | $14.6M | 2.05% | +761,905 | New |
| Soleus Capital Management, L.P. | 783,000 | $15.0M | 0.61% | +783,000 | New |
| D. E. Shaw & Co., Inc. | 783,906 | $15.0M | 0.01% | −70,360−8.2% | Reduced |
| Voya Investment Management LLC | 804,137 | $15.4M | 0.02% | +484,609+151.7% | Added |
| Wellington Management Group LLP | 1,042,764 | $20.0M | 0.00% | +944,455+960.7% | Added |
| Baillie Gifford & Co | 1,089,393 | $20.9M | 0.02% | −56,123−4.9% | Reduced |
| First Light Asset Management, LLC | 1,314,715 | $25.2M | 2.26% | +225,222+20.7% | Added |
| Freestone Grove Partners LP | 1,330,742 | $25.5M | 0.18% | −112,094−7.8% | Reduced |
| Morgan Stanley | 1,357,542 | $26.0M | 0.00% | −722,955−34.7% | Reduced |
| Marshall Wace, LLP | 1,442,472 | $27.7M | 0.03% | +566,941+64.8% | Added |
| Jacobs Levy Equity Management, Inc | 1,523,946 | $29.2M | 0.12% | −129,762−7.8% | Reduced |
| Jennison Associates LLC | 1,658,448 | $31.8M | 0.02% | −362,928−18.0% | Reduced |
| Geode Capital Management, LLC | 1,679,863 | $32.2M | 0.00% | +30,480+1.8% | Added |
| Two Sigma Investments, LP | 1,864,194 | $35.7M | 0.03% | +662,667+55.2% | Added |
| Paradice Investment Management LLC | 2,042,425 | $39.2M | 7.43% | −35,320−1.7% | Reduced |
| UBS Group AG | 2,047,801 | $39.3M | 0.01% | +1,629,968+390.1% | Added |
| Citadel Advisors LLC | 2,192,667 | $42.0M | 0.03% | +104,064+5.0% | Added |
| Goldman Sachs Group Inc | 2,218,922 | $42.5M | 0.01% | +535,522+31.8% | Added |
| Driehaus Capital Management LLC | 2,304,414 | $44.2M | 0.32% | +694,072+43.1% | Added |
| State Street Corp | 2,662,260 | $51.0M | 0.00% | +20,536+0.8% | Added |
| GW&K Investment Management, LLC | 2,689,106 | $51.5M | 0.45% | +13,949+0.5% | Added |
| Vanguard Capital Management LLC | 3,038,919 | $58.3M | 0.00% | +3,038,919 | New |
| ArrowMark Colorado Holdings LLC | 3,103,609 | $59.5M | 1.58% | +213,918+7.4% | Added |
| Vanguard Portfolio Management LLC | 3,993,333 | $76.6M | 0.00% | +3,993,333 | New |
| Sessa Capital IM, L.P. | 4,730,757 | $90.7M | 1.73% | −269,243−5.4% | Reduced |
| BlackRock, Inc. | 10,690,844 | $204.9M | 0.00% | −458,337−4.1% | Reduced |
| Two Sigma Advisers, LP | 0 | $0 | 0.00% | −937,983−100.0% | Sold out |
| Balyasny Asset Management LLC | 0 | $0 | 0.00% | −262,788−100.0% | Sold out |
| Jane Street Group, LLC | 0 | $0 | 0.00% | −209,975−100.0% | Sold out |
| Adage Capital Partners GP, L.L.C. | 0 | $0 | 0.00% | −182,995−100.0% | Sold out |
| HRT Financial LP | 0 | $0 | 0.00% | −170,480−100.0% | Sold out |
| Engineers Gate Manager LP | 0 | $0 | 0.00% | −88,547−100.0% | Sold out |
| Winton Group Ltd | 0 | $0 | 0.00% | −44,244−100.0% | Sold out |
| Jump Financial, LLC | 0 | $0 | 0.00% | −41,416−100.0% | Sold out |
| Capital Fund Management S.A. | 0 | $0 | 0.00% | −38,400−100.0% | Sold out |
| HSBC Holdings PLC | 0 | $0 | 0.00% | −36,553−100.0% | Sold out |
| Quest Partners LLC | 0 | $0 | 0.00% | −35,634−100.0% | Sold out |
| Deerfield Management Company, L.P. (Series C) | 0 | $0 | 0.00% | −26,090−100.0% | Sold out |
| PharVision Advisers, LLC | 0 | $0 | 0.00% | −19,554−100.0% | Sold out |
| CAPROCK Group, Inc. | 0 | $0 | 0.00% | −14,831−100.0% | Sold out |
| Schonfeld Strategic Advisors LLC | 0 | $0 | 0.00% | −14,590−100.0% | Sold out |
| MN Wealth Advisors, LLC | 0 | $0 | 0.00% | −13,770−100.0% | Sold out |
| Man Group plc | 0 | $0 | 0.00% | −12,782−100.0% | Sold out |
| Fox Run Management, L.L.C. | 0 | $0 | 0.00% | −11,398−100.0% | Sold out |
| Lighthouse Investment Partners, LLC | 0 | $0 | 0.00% | −11,000−100.0% | Sold out |
| Cetera Investment Advisers | 0 | $0 | 0.00% | −10,937−100.0% | Sold out |
| Maryland State Retirement & Pension System | 0 | $0 | 0.00% | −9,855−100.0% | Sold out |
| Creative Planning | 0 | $0 | 0.00% | −9,478−100.0% | Sold out |
| EntryPoint Capital, LLC | 0 | $0 | 0.00% | −9,477−100.0% | Sold out |
| Fiduciary Trust Co | 0 | $0 | 0.00% | −9,447−100.0% | Sold out |
| Walleye Trading LLC | 0 | $0 | 0.00% | −9,358−100.0% | Sold out |
| Quarry LP | 0 | $0 | 0.00% | −1,437−100.0% | Sold out |