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 |
|---|---|---|---|---|---|
| Huntington National Bank | 1 | $19 | 0.00% | 00.0% | Unchanged |
| Abound Wealth Management | 5 | $96 | 0.00% | −1−16.7% | Reduced |
| Optiver Holding B.V. | 8 | $153 | 0.00% | +8 | New |
| Ankerstar Wealth, LLC | 11 | $211 | 0.00% | 00.0% | Unchanged |
| Cedar Mountain Advisors, LLC | 12 | $230 | 0.00% | −8−40.0% | Reduced |
| Gilpin Wealth Management, LLC | 12 | $231 | 0.00% | +7+140.0% | Added |
| Accordant Advisory Group Inc | 12 | $231 | 0.00% | +12 | New |
| Root Financial Partners, LLC | 14 | $268 | 0.00% | +14 | New |
| ZRC Wealth Management, LLC | 14 | $269 | 0.00% | +14 | New |
| International Assets Investment Management, LLC | 15 | $282 | 0.00% | 00.0% | Unchanged |
| JFS Wealth Advisors, LLC | 15 | $288 | 0.00% | 00.0% | Unchanged |
| Elequin Capital LP | 24 | $460 | 0.00% | −66−73.3% | Reduced |
| SBI Securities Co., Ltd. | 28 | $537 | 0.00% | +8+40.0% | Added |
| Eastern Bank | 32 | $613 | 0.00% | 00.0% | Unchanged |
| Bell Investment Advisors, Inc | 36 | $691 | 0.00% | 00.0% | Unchanged |
| Golden State Equity Partners | 40 | $766 | 0.00% | +40 | New |
| Cornerstone Planning Group LLC | 40 | $777 | 0.00% | 00.0% | Unchanged |
| Golden State Wealth Management, LLC | 41 | $786 | 0.00% | −39−48.8% | Reduced |
| Bare Financial Services, Inc | 42 | $805 | 0.00% | −22−34.4% | Reduced |
| Farmers & Merchants Investments Inc | 50 | $959 | 0.00% | 00.0% | Unchanged |
| Parkside Financial Bank & Trust | 56 | $1.07K | 0.00% | 00.0% | Unchanged |
| TD Private Client Wealth LLC | 60 | $1.15K | 0.00% | 00.0% | Unchanged |
| JPL Wealth Management, LLC | 61 | $1.17K | 0.00% | +61 | New |
| IFP Advisors, Inc | 69 | $1.32K | 0.00% | 00.0% | Unchanged |
| Keating Financial Advisory Services, Inc. | 77 | $1.48K | 0.00% | +77 | New |
| Fortitude Family Office, LLC | 97 | $1.86K | 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 |
| Bessemer Group Inc | 90 | $2.00K | 0.00% | 00.0% | Unchanged |
| MAI Capital Management | 113 | $2.17K | 0.00% | −28−19.9% | Reduced |
| Newbridge Financial Services Group, Inc. | 120 | $2.30K | 0.00% | 00.0% | Unchanged |
| Colonial Trust Co | 122 | $2.39K | 0.00% | −6−4.7% | Reduced |
| Rothschild Investment LLC | 133 | $2.55K | 0.00% | +10+8.1% | Added |
| Twin Peaks Wealth Advisors, LLC | 142 | $2.72K | 0.00% | +142 | New |
| Harbour Investments, Inc. | 204 | $3.91K | 0.00% | 00.0% | Unchanged |
| True Wealth Design, LLC | 207 | $3.97K | 0.00% | +140+209.0% | Added |
| GWM Advisors LLC | 227 | $4.35K | 0.00% | +127+127.0% | Added |
| Beacon Investment Advisory Services, Inc. | 240 | $4.60K | 0.00% | +240 | New |
| Parallel Advisors, LLC | 265 | $5.08K | 0.00% | +200+307.7% | Added |
| Quent Capital, LLC | 309 | $5.92K | 0.00% | −148−32.4% | Reduced |
| SJS Investment Consulting Inc. | 321 | $6.15K | 0.00% | +310+2,818.2% | Added |
| Los Angeles Capital Management LLC | 348 | $6.67K | 0.00% | 00.0% | Unchanged |
| Covestor Ltd | 385 | $7.00K | 0.00% | −311−44.7% | Reduced |
| Transamerica Financial Advisors, Inc. | 389 | $7.46K | 0.00% | 00.0% | Unchanged |
| Rockefeller Capital Management L.P. | 433 | $8.30K | 0.00% | −194−30.9% | Reduced |
| Sterling Capital Management LLC | 439 | $8.42K | 0.00% | −5−1.1% | Reduced |
| Umb Bank N A | 444 | $8.51K | 0.00% | +67+17.8% | Added |
| Smartleaf Asset Management LLC | 440 | $8.62K | 0.00% | −890−66.9% | Reduced |
| Signaturefd, LLC | 477 | $9.14K | 0.00% | +130+37.5% | Added |
| Quadrant Capital Group LLC | 480 | $9.20K | 0.00% | −88−15.5% | Reduced |
| Kemnay Advisory Services Inc. | 538 | $10.3K | 0.00% | +538 | New |
| Allworth Financial LP | 645 | $12.4K | 0.00% | +103+19.0% | Added |
| Hantz Financial Services, Inc. | 721 | $14.0K | 0.00% | −14−1.9% | Reduced |
| SRS Capital Advisors, Inc. | 748 | $14.3K | 0.00% | +250+50.2% | Added |
| Salomon & Ludwin, LLC | 776 | $14.4K | 0.00% | +181+30.4% | Added |
| Larson Financial Group LLC | 804 | $15.4K | 0.00% | +512+175.3% | Added |
| Wellington-Altus USA Inc. | 1,151 | $17.4K | 0.01% | +343+42.5% | Added |
| Salem Investment Counselors Inc | 1,000 | $19.2K | 0.00% | +1,000 | New |
| Ancora Advisors, LLC | 1,230 | $23.6K | 0.00% | +870+241.7% | Added |
| CoreCap Advisors, LLC | 1,283 | $24.6K | 0.00% | −4,626−78.3% | Reduced |
| EverSource Wealth Advisors, LLC | 1,322 | $25.3K | 0.00% | +271+25.8% | Added |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 1,348 | $25.8K | 0.00% | +369+37.7% | Added |
| McIlrath & Eck, LLC | 1,605 | $30.8K | 0.00% | 00.0% | Unchanged |
| First Horizon Corp | 1,618 | $31.0K | 0.00% | −6−0.4% | Reduced |
| Northwestern Mutual Wealth Management Co | 1,634 | $31.3K | 0.00% | +948+138.2% | Added |
| AdvisorNet Financial, Inc | 1,680 | $32.2K | 0.00% | 00.0% | Unchanged |
| Assetmark, Inc | 1,750 | $33.5K | 0.00% | 00.0% | Unchanged |
| Group One Trading, L.P. | 1,815 | $34.8K | 0.00% | −58,921−97.0% | Reduced |
| Aster Capital Management (DIFC) Ltd | 1,830 | $35.1K | 0.01% | +1,830 | New |
| OP Asset Management Ltd | 1,835 | $35.2K | 0.00% | −15,279−89.3% | Reduced |
| KBC Group NV | 2,011 | $39.0K | 0.00% | 00.0% | Unchanged |
| US Bancorp | 2,209 | $42.3K | 0.00% | +190+9.4% | Added |
| Quantbot Technologies LP | 2,285 | $43.8K | 0.00% | −30,671−93.1% | Reduced |
| Stonehage Fleming Financial Services Holdings Ltd | 2,551 | $48.9K | 0.00% | 00.0% | Unchanged |
| Advisor Group Holdings, Inc. | 2,588 | $49.6K | 0.00% | −28−1.1% | Reduced |
| Nisa Investment Advisors, LLC | 2,782 | $53.3K | 0.00% | +1,447+108.4% | Added |
| Essential Partners LLC | 2,888 | $55.4K | 0.02% | +10.0% | Added |
| Simplex Trading, LLC | 2,903 | $55.6K | 0.00% | +2,903 | New |
| Van Eck Associates Corp | 2,918 | $56.0K | 0.00% | −512−14.9% | Reduced |
| Farther Finance Advisors, LLC | 3,121 | $58.7K | 0.00% | −479−13.3% | Reduced |
| Pinnacle Wealth Planning Services, Inc. | 3,073 | $58.9K | 0.01% | +66+2.2% | Added |
| Versant Capital Management, Inc | 3,335 | $63.9K | 0.01% | +2,958+784.6% | Added |
| Creative Financial Designs Inc | 3,431 | $65.8K | 0.00% | 00.0% | Unchanged |
| GAMMA Investing LLC | 3,502 | $67.1K | 0.00% | −1,040−22.9% | Reduced |
| Virtus ETF Advisers LLC | 4,400 | $84.3K | 0.04% | +4,400 | New |
| China Universal Asset Management Co., Ltd. | 5,000 | $95.8K | 0.01% | −3,000−37.5% | Reduced |
| Ensign Peak Advisors, Inc | 5,032 | $96.5K | 0.00% | 00.0% | Unchanged |
| Natixis | 5,500 | $105.4K | 0.00% | +5,500 | New |
| Ameritas Investment Partners, Inc. | 5,586 | $107.1K | 0.00% | 00.0% | Unchanged |
| Bayforest Capital Ltd | 7,265 | $139.3K | 0.16% | −20,144−73.5% | Reduced |
| Public Employees Retirement Association of Colorado | 7,650 | $147.0K | 0.00% | 00.0% | Unchanged |
| Advisory Services Network, LLC | 8,274 | $158.6K | 0.00% | +8,274 | New |
| Tower Research Capital LLC (TRC) | 9,147 | $175.3K | 0.00% | −3,911−30.0% | Reduced |
| Leonteq Securities AG | 9,501 | $182.1K | 0.01% | +1,695+21.7% | Added |
| Prosperitas Financial LLC | 10,000 | $191.7K | 0.07% | 00.0% | Unchanged |
| Apollon Wealth Management, LLC | 10,534 | $201.9K | 0.00% | −424−3.9% | Reduced |
| ProShare Advisors LLC | 10,554 | $202.3K | 0.00% | −2,631−20.0% | Reduced |
| Park Avenue Securities LLC | 10,647 | $204.0K | 0.00% | +1,244+13.2% | Added |
| Pictet Asset Management Holding SA | 10,764 | $206.3K | 0.00% | +10,764 | New |
| Victory Capital Management Inc | 10,883 | $208.6K | 0.00% | +1,112+11.4% | Added |