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 |
|---|---|---|---|---|---|
| Stonehage Fleming Financial Services Holdings Ltd | 2,551 | $48.9K | 0.00% | 00.0% | Unchanged |
| Quantbot Technologies LP | 2,285 | $43.8K | 0.00% | −30,671−93.1% | Reduced |
| US Bancorp | 2,209 | $42.3K | 0.00% | +190+9.4% | Added |
| KBC Group NV | 2,011 | $39.0K | 0.00% | 00.0% | Unchanged |
| OP Asset Management Ltd | 1,835 | $35.2K | 0.00% | −15,279−89.3% | Reduced |
| Aster Capital Management (DIFC) Ltd | 1,830 | $35.1K | 0.01% | +1,830 | New |
| Group One Trading, L.P. | 1,815 | $34.8K | 0.00% | −58,921−97.0% | Reduced |
| Assetmark, Inc | 1,750 | $33.5K | 0.00% | 00.0% | Unchanged |
| AdvisorNet Financial, Inc | 1,680 | $32.2K | 0.00% | 00.0% | Unchanged |
| Northwestern Mutual Wealth Management Co | 1,634 | $31.3K | 0.00% | +948+138.2% | Added |
| First Horizon Corp | 1,618 | $31.0K | 0.00% | −6−0.4% | Reduced |
| McIlrath & Eck, LLC | 1,605 | $30.8K | 0.00% | 00.0% | Unchanged |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 1,348 | $25.8K | 0.00% | +369+37.7% | Added |
| EverSource Wealth Advisors, LLC | 1,322 | $25.3K | 0.00% | +271+25.8% | Added |
| CoreCap Advisors, LLC | 1,283 | $24.6K | 0.00% | −4,626−78.3% | Reduced |
| Ancora Advisors, LLC | 1,230 | $23.6K | 0.00% | +870+241.7% | Added |
| Salem Investment Counselors Inc | 1,000 | $19.2K | 0.00% | +1,000 | New |
| Wellington-Altus USA Inc. | 1,151 | $17.4K | 0.01% | +343+42.5% | Added |
| Larson Financial Group LLC | 804 | $15.4K | 0.00% | +512+175.3% | Added |
| Salomon & Ludwin, LLC | 776 | $14.4K | 0.00% | +181+30.4% | Added |
| SRS Capital Advisors, Inc. | 748 | $14.3K | 0.00% | +250+50.2% | Added |
| Hantz Financial Services, Inc. | 721 | $14.0K | 0.00% | −14−1.9% | Reduced |
| Allworth Financial LP | 645 | $12.4K | 0.00% | +103+19.0% | Added |
| Kemnay Advisory Services Inc. | 538 | $10.3K | 0.00% | +538 | New |
| Quadrant Capital Group LLC | 480 | $9.20K | 0.00% | −88−15.5% | Reduced |
| Signaturefd, LLC | 477 | $9.14K | 0.00% | +130+37.5% | Added |
| Smartleaf Asset Management LLC | 440 | $8.62K | 0.00% | −890−66.9% | Reduced |
| Umb Bank N A | 444 | $8.51K | 0.00% | +67+17.8% | Added |
| Sterling Capital Management LLC | 439 | $8.42K | 0.00% | −5−1.1% | Reduced |
| Rockefeller Capital Management L.P. | 433 | $8.30K | 0.00% | −194−30.9% | Reduced |
| Transamerica Financial Advisors, Inc. | 389 | $7.46K | 0.00% | 00.0% | Unchanged |
| Covestor Ltd | 385 | $7.00K | 0.00% | −311−44.7% | Reduced |
| Los Angeles Capital Management LLC | 348 | $6.67K | 0.00% | 00.0% | Unchanged |
| SJS Investment Consulting Inc. | 321 | $6.15K | 0.00% | +310+2,818.2% | Added |
| Quent Capital, LLC | 309 | $5.92K | 0.00% | −148−32.4% | Reduced |
| Parallel Advisors, LLC | 265 | $5.08K | 0.00% | +200+307.7% | Added |
| Beacon Investment Advisory Services, Inc. | 240 | $4.60K | 0.00% | +240 | New |
| GWM Advisors LLC | 227 | $4.35K | 0.00% | +127+127.0% | Added |
| True Wealth Design, LLC | 207 | $3.97K | 0.00% | +140+209.0% | Added |
| Harbour Investments, Inc. | 204 | $3.91K | 0.00% | 00.0% | Unchanged |
| Twin Peaks Wealth Advisors, LLC | 142 | $2.72K | 0.00% | +142 | New |
| Rothschild Investment LLC | 133 | $2.55K | 0.00% | +10+8.1% | Added |
| Colonial Trust Co | 122 | $2.39K | 0.00% | −6−4.7% | Reduced |
| Newbridge Financial Services Group, Inc. | 120 | $2.30K | 0.00% | 00.0% | Unchanged |
| MAI Capital Management | 113 | $2.17K | 0.00% | −28−19.9% | Reduced |
| Bessemer Group Inc | 90 | $2.00K | 0.00% | 00.0% | Unchanged |
| Toth Financial Advisory Corp | 100 | $1.92K | 0.00% | 00.0% | Unchanged |
| Front Row Advisors LLC | 100 | $1.92K | 0.00% | 00.0% | Unchanged |
| Fortitude Family Office, LLC | 97 | $1.86K | 0.00% | 00.0% | Unchanged |
| Keating Financial Advisory Services, Inc. | 77 | $1.48K | 0.00% | +77 | New |
| IFP Advisors, Inc | 69 | $1.32K | 0.00% | 00.0% | Unchanged |
| JPL Wealth Management, LLC | 61 | $1.17K | 0.00% | +61 | New |
| TD Private Client Wealth LLC | 60 | $1.15K | 0.00% | 00.0% | Unchanged |
| Parkside Financial Bank & Trust | 56 | $1.07K | 0.00% | 00.0% | Unchanged |
| Farmers & Merchants Investments Inc | 50 | $959 | 0.00% | 00.0% | Unchanged |
| Bare Financial Services, Inc | 42 | $805 | 0.00% | −22−34.4% | Reduced |
| Golden State Wealth Management, LLC | 41 | $786 | 0.00% | −39−48.8% | Reduced |
| Cornerstone Planning Group LLC | 40 | $777 | 0.00% | 00.0% | Unchanged |
| Golden State Equity Partners | 40 | $766 | 0.00% | +40 | New |
| Bell Investment Advisors, Inc | 36 | $691 | 0.00% | 00.0% | Unchanged |
| Eastern Bank | 32 | $613 | 0.00% | 00.0% | Unchanged |
| SBI Securities Co., Ltd. | 28 | $537 | 0.00% | +8+40.0% | Added |
| Elequin Capital LP | 24 | $460 | 0.00% | −66−73.3% | Reduced |
| JFS Wealth Advisors, LLC | 15 | $288 | 0.00% | 00.0% | Unchanged |
| International Assets Investment Management, LLC | 15 | $282 | 0.00% | 00.0% | Unchanged |
| ZRC Wealth Management, LLC | 14 | $269 | 0.00% | +14 | New |
| Root Financial Partners, LLC | 14 | $268 | 0.00% | +14 | New |
| Gilpin Wealth Management, LLC | 12 | $231 | 0.00% | +7+140.0% | Added |
| Accordant Advisory Group Inc | 12 | $231 | 0.00% | +12 | New |
| Cedar Mountain Advisors, LLC | 12 | $230 | 0.00% | −8−40.0% | Reduced |
| Ankerstar Wealth, LLC | 11 | $211 | 0.00% | 00.0% | Unchanged |
| Optiver Holding B.V. | 8 | $153 | 0.00% | +8 | New |
| Abound Wealth Management | 5 | $96 | 0.00% | −1−16.7% | Reduced |
| Huntington National Bank | 1 | $19 | 0.00% | 00.0% | Unchanged |
| 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 |