TANDEM DIABETES CARE INC (TNDM)
Institutional ownership reported to the SEC as of Q2 2026, across 31 quarters.
259
Reporting holders
$1.3B
Reported value
110.9%
Of shares outstanding
7.8%
Held as options
+2
Holder change
Institutions report 77,139,486 shares against 69,578,707 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end. Over 100% because an adviser and a sub-adviser can both report the same shares, and both are counted.
Options share is the part of reported value carried in derivative lines rather than shares. A high figure means institutions are expressing a view on this security without owning much of it.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| BlackRock, Inc. | $174.8M | 11,583,125 | 0.00% | 8q | +8.3%+$13.5M |
| UBS Group AG | $95.4M | 1,146,580 | 0.01% | 31q | -44.0%-$75.0M |
| Sessa Capital IM, L.P. | $77.0M | 5,100,000 | 1.29% | 6q | +7.8%+$5.6M |
| VANGUARD PORTFOLIO MANAGEMENT LLC | $64.9M | 4,299,667 | 0.00% | 2q | +7.7%+$4.6M |
| First Light Asset Management, LLC | $51.1M | 3,383,553 | 3.10% | 3q | +157.4%+$31.2M |
| VANGUARD CAPITAL MANAGEMENT LLC | $46.7M | 3,096,536 | 0.00% | 2q | +1.9%+$869.4K |
| STATE STREET CORP | $43.0M | 2,851,646 | 0.00% | 31q | +7.1%+$2.9M |
| JENNISON ASSOCIATES LLC | $35.2M | 2,331,429 | 0.02% | 13q | +40.6%+$10.2M |
| Paradice Investment Management LLC | $30.5M | 2,024,014 | 4.87% | 13q | -0.9%-$277.8K |
| JACOBS LEVY EQUITY MANAGEMENT, INC | $30.3M | 2,006,429 | 0.11% | 15q | +31.7%+$7.3M |
| Freestone Grove Partners LP | $28.2M | 1,866,134 | 0.18% | 4q | +40.2%+$8.1M |
| CITADEL ADVISORS LLC | $28.0M | 1,735,879 | 0.00% | 31q | -20.8%-$7.4M |
| GEODE CAPITAL MANAGEMENT, LLC | $27.2M | 1,800,797 | 0.00% | 31q | +7.2%+$1.8M |
| Driehaus Capital Management LLC | $27.0M | 1,786,996 | 0.16% | 3q | -22.5%-$7.8M |
| Verition Fund Management LLC | $21.1M | 1,400,000 | 0.05% | 6q | +1207.0%+$19.5M |
| MILLENNIUM MANAGEMENT LLC | $19.8M | 1,311,739 | 0.01% | 25q | +72.2%+$8.3M |
| Woodline Partners LP | $19.7M | 1,307,439 | 0.06% | new | NEW |
| ArrowMark Colorado Holdings LLC | $19.6M | 1,299,586 | 0.82% | 12q | -58.1%-$27.2M |
| FMR LLC | $14.7M | 976,432 | 0.00% | 31q | +36.8%+$4.0M |
| Point72 Asset Management, L.P. | $13.7M | 610,903 | 0.02% | 2q | +45.3%+$4.3M |
| ROYCE & ASSOCIATES LP | $13.6M | 900,590 | 0.11% | 4q | +29.3%+$3.1M |
| WELLINGTON MANAGEMENT GROUP LLP | $13.2M | 871,811 | 0.00% | 3q | -16.4%-$2.6M |
| GOLDMAN SACHS GROUP INC | $13.0M | 862,301 | 0.00% | 31q | -61.1%-$20.5M |
| NORTHERN TRUST CORP | $11.4M | 753,690 | 0.00% | 31q | +6.7%+$710.5K |
| ExodusPoint Capital Management, LP | $10.4M | 691,789 | 0.07% | 2q | +9.3%+$888.7K |
| Qube Research & Technologies Ltd | $10.3M | 683,823 | 0.01% | 2q | +1216.0%+$9.5M |
| D. E. Shaw & Co., Inc. | $10.3M | 681,808 | 0.00% | 5q | -13.0%-$1.5M |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | $10.1M | 667,689 | 0.00% | 3q | +245.0%+$7.2M |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $9.9M | 656,836 | 0.00% | 31q | +2.2%+$214.9K |
| Sixth Street Partners Management Company, L.P. | $9.9M | 656,836 | 0.00% | new | NEW |
| MORGAN STANLEY | $9.8M | 647,069 | 0.00% | 34q | -52.3%-$10.7M |
| Soleus Capital Management, L.P. | $8.7M | 575,000 | 0.30% | 2q | -26.6%-$3.1M |
| BANK OF MONTREAL /CAN/ | $8.5M | 564,966 | 0.00% | 11q | +1409.2%+$8.0M |
| TWO SIGMA INVESTMENTS, LP | $8.4M | 558,409 | 0.01% | 31q | -70.0%-$19.7M |
| AQR CAPITAL MANAGEMENT LLC | $8.1M | 533,837 | 0.00% | 9q | +60.8%+$3.0M |
| VANGUARD FIDUCIARY TRUST CO | $7.4M | 491,103 | 0.00% | 2q | +4.1%+$293.4K |
| Public Sector Pension Investment Board | $7.1M | 470,916 | 0.01% | 14q | +94.1%+$3.4M |
| Aberdeen Group plc | $6.7M | 441,738 | 0.01% | 8q | +1.8%+$116.4K |
| Jump Financial, LLC | $6.1M | 404,400 | 0.05% | new | NEW |
| BANK OF AMERICA CORP /DE/ | $6.0M | 395,054 | 0.00% | 31q | +5.8%+$329.4K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $5.8M | 117,958 | 0.00% | 31q | +46.1%+$1.8M |
| FRONTIER CAPITAL MANAGEMENT CO LLC | $5.7M | 380,458 | 0.05% | 31q | -4.2%-$252.8K |
| BARCLAYS PLC | $5.6M | 350,429 | 0.00% | 31q | -16.8%-$1.1M |
| JPMORGAN CHASE & CO | $5.5M | 349,652 | 0.00% | 31q | HELD |
| TUDOR INVESTMENT CORP ET AL | $5.5M | 362,708 | 0.01% | 14q | +359.1%+$4.3M |
| DAFNA Capital Management LLC | $5.4M | 355,208 | 1.02% | 13q | HELD |
| Bank of New York Mellon Corp | $5.3M | 352,161 | 0.00% | 31q | +4.7%+$239.5K |
| PRINCIPAL FINANCIAL GROUP INC | $5.1M | 335,094 | 0.00% | 31q | +1.1%+$53.6K |
| Invesco Ltd. | $4.8M | 321,128 | 0.00% | 31q | +9.2%+$408.6K |
| Y-Intercept (Hong Kong) Ltd | $4.7M | 314,653 | 0.09% | 4q | +304.0%+$3.6M |
| Alberta Investment Management Corp | $4.7M | 313,700 | 0.03% | new | NEW |
| EDMOND DE ROTHSCHILD HOLDING S.A. | $4.7M | 308,200 | 0.06% | 6q | +19.4%+$754.5K |
| Quantinno Capital Management LP | $4.6M | 306,660 | 0.01% | 11q | -53.1%-$5.2M |
| KVP Capital Advisors, LP | $4.5M | 301,000 | 3.33% | new | NEW |
| Meridiem Capital Partners LP | $4.5M | 298,255 | 0.20% | new | NEW |
| FIRST TRUST ADVISORS LP | $4.4M | 292,844 | 0.00% | 2q | -14.5%-$752.4K |
| Holocene Advisors, LP | $4.0M | 267,860 | 0.01% | 3q | -43.9%-$3.2M |
| SECTOR GAMMA AS | $4.0M | 267,091 | 0.87% | 6q | HELD |
| BEACONLIGHT CAPITAL, LLC | $4.0M | 266,009 | 1.42% | 2q | +4.8%+$183.1K |
| ENVESTNET ASSET MANAGEMENT INC | $3.6M | 235,966 | 0.00% | 27q | -3.0%-$109.9K |
| ALGERT GLOBAL LLC | $3.6M | 235,739 | 0.04% | 26q | HELD |
| ROYAL BANK OF CANADA | $3.4M | 225,174 | 0.00% | 31q | +9.3%+$288.8K |
| Squarepoint Ops LLC | $3.3M | 217,386 | 0.00% | new | NEW |
| XTX Topco Ltd | $3.2M | 212,976 | 0.04% | 2q | +250.2%+$2.3M |
| NOMURA HOLDINGS INC | $2.8M | 25,889 | 0.00% | new | NEW |
| Connor, Clark & Lunn Investment Management Ltd. | $2.8M | 184,073 | 0.01% | new | NEW |
| JANE STREET GROUP, LLC | $2.6M | options only | 0.00% | 31q | OPTIONS |
| Jefferies Financial Group Inc. | $2.5M | 166,489 | 0.02% | 2q | +193.5%+$1.7M |
| RHUMBLINE ADVISERS | $2.5M | 164,053 | 0.00% | 31q | -11.9%-$335.9K |
| Nierenberg Investment Management Company, LLC | $2.4M | 158,910 | 1.19% | 3q | +99.9%+$1.2M |
| Nuveen, LLC | $2.4M | 157,066 | 0.00% | 6q | -56.8%-$3.1M |
| Legal & General Group Plc | $2.4M | 155,749 | 0.00% | 31q | HELD |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | $2.3M | 151,847 | 0.00% | 31q | -9.9%-$251.2K |
| Russell Investments Group, Ltd. | $2.2M | 148,584 | 0.00% | 31q | +11.2%+$226.2K |
| Banco Santander, S.A. | $2.2M | 147,200 | 0.01% | 2q | +974.5%+$2.0M |
| IMC-Chicago, LLC | $2.2M | options only | 0.00% | 8q | OPTIONS |
| VOYA INVESTMENT MANAGEMENT LLC | $2.2M | 142,597 | 0.00% | 31q | -82.3%-$10.0M |
| MIZUHO MARKETS AMERICAS LLC | $2.1M | 137,762 | 0.03% | 9q | -12.5%-$295.8K |
| Swiss National Bank | $2.1M | 137,500 | 0.00% | 31q | +3.2%+$63.4K |
| Schonfeld Strategic Advisors LLC | $2.0M | 129,567 | 0.01% | new | NEW |
| FEDERATED HERMES, INC. | $1.9M | 123,819 | 0.00% | 3q | HELD |
| RAYMOND JAMES FINANCIAL INC | $1.8M | 122,021 | 0.00% | 7q | -2.7%-$50.2K |
| AMERIPRISE FINANCIAL INC | $1.7M | 113,522 | 0.00% | 31q | -53.1%-$1.9M |
| BANQUE PICTET & CIE SA | $1.7M | 112,335 | 0.01% | 5q | -9.4%-$175.0K |
| GABELLI FUNDS LLC | $1.6M | 103,000 | 0.01% | 2q | +312.0%+$1.2M |
| Trexquant Investment LP | $1.4M | 90,058 | 0.01% | 5q | -63.9%-$2.4M |
| ALLIANCEBERNSTEIN L.P. | $1.3M | 70,049 | 0.00% | 31q | -4.2%-$59.4K |
| Cinctive Capital Management LP | $1.3M | 86,906 | 0.05% | 2q | +36.2%+$348.5K |
| Universal- Beteiligungs- und Servicegesellschaft mbH | $1.3M | 84,904 | 0.00% | 6q | -2.8%-$37.0K |
| FIDEURAM - INTESA SANPAOLO PRIVATE BANKING S.P.A. | $1.3M | 84,862 | 0.04% | new | NEW |
| INTECH INVESTMENT MANAGEMENT LLC | $1.2M | 81,071 | 0.01% | 9q | -27.2%-$458.0K |
| Cerity Partners LLC | $1.1M | 76,122 | 0.00% | 10q | HELD |
| DEUTSCHE BANK AG\ | $1.1M | 75,155 | 0.00% | 34q | +24.0%+$219.2K |
| WELLS FARGO & COMPANY/MN | $1.1M | 72,181 | 0.00% | 31q | +14.5%+$137.6K |
| JONES FINANCIAL COMPANIES LLLP | $1.1M | 66,267 | 0.00% | 10q | +13.5%+$128.0K |
| PRUDENTIAL FINANCIAL INC | $1.1M | 70,474 | 0.00% | 14q | +1.5%+$16.1K |
| FORMULA GROWTH LTD | $1.1M | 70,304 | 0.37% | 26q | -0.7%-$7.9K |
| Susquehanna Portfolio Strategies, LLC | $1.0M | 68,897 | 0.02% | 5q | -66.6%-$2.1M |
| Louisiana State Employees Retirement System | $1.0M | 60,100 | 0.01% | 20q | +99.7%+$514.0K |
| STIFEL FINANCIAL CORP | $1.0M | 68,185 | 0.00% | 11q | +153.1%+$622.3K |
Five percent filings
Anyone crossing 5% of a company must say so within days - far sooner than the next quarterly holdings report. A 13D declares an intent to influence the company; a 13G is the passive version. See all activist filings →
| Filed | Form | Filer | % of class |
|---|---|---|---|
| 2026-08-06 | 13G/A | Voya Financial, Inc. | 0.2% |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 259 | $1.3B | 77,139,486 | 44 | 90 | 78 | 7.8% |
| Q1 2026 | 257 | $1.6B | 75,651,709 | 41 | 90 | 80 | 7.3% |
| Q4 2025 | 250 | $1.6B | 71,331,935 | 47 | 76 | 91 | 4.7% |
| Q3 2025 | 234 | $904.8M | 71,286,988 | 40 | 65 | 85 | 4.7% |
| Q2 2025 | 247 | $1.5B | 77,859,677 | 36 | 100 | 65 | 3.9% |
| Q1 2025 | 249 | $1.4B | 69,302,787 | 29 | 97 | 74 | 4.7% |
| Q4 2024 | 291 | $2.6B | 69,050,055 | 28 | 118 | 84 | 4.6% |
| Q3 2024 | 304 | $3.2B | 70,745,362 | 53 | 98 | 103 | 4.9% |
| Q2 2024 | 285 | $3.0B | 71,372,887 | 56 | 111 | 75 | 4.9% |
| Q1 2024 | 262 | $2.7B | 74,075,322 | 44 | 102 | 70 | 4.6% |
| Q4 2023 | 241 | $2.1B | 69,773,526 | 56 | 67 | 76 | 1.4% |
| Q3 2023 | 204 | $1.4B | 68,746,916 | 24 | 65 | 78 | 1.0% |
| Q2 2023 | 215 | $1.6B | 65,748,725 | 30 | 81 | 68 | 0.7% |
| Q1 2023 | 235 | $3.0B | 73,716,377 | 32 | 91 | 75 | 0.4% |
| Q4 2022 | 231 | $2.7B | 59,502,857 | 39 | 75 | 78 | 1.0% |
| Q3 2022 | 299 | $3.1B | 63,601,926 | 38 | 100 | 115 | 1.4% |
| Q2 2022 | 331 | $3.7B | 62,072,827 | 38 | 142 | 109 | 1.9% |
| Q1 2022 | 376 | $7.1B | 59,952,590 | 56 | 144 | 112 | 1.1% |
| Q4 2021 | 396 | $9.4B | 60,578,984 | 68 | 139 | 109 | 2.6% |
| Q3 2021 | 343 | $7.5B | 61,294,300 | 78 | 98 | 107 | 2.1% |
| Q2 2021 | 302 | $5.9B | 59,260,115 | 49 | 103 | 90 | 2.0% |
| Q1 2021 | 296 | $5.2B | 57,571,164 | 45 | 98 | 100 | 2.2% |
| Q4 2020 | 309 | $5.9B | 59,008,294 | 37 | 104 | 101 | 3.7% |
| Q3 2020 | 321 | $6.5B | 54,626,667 | 49 | 108 | 109 | 4.1% |
| Q2 2020 | 303 | $5.7B | 55,482,278 | 67 | 79 | 114 | 3.6% |
| Q1 2020 | 276 | $3.7B | 57,037,810 | 47 | 78 | 103 | 1.9% |
| Q4 2019 | 284 | $3.4B | 55,419,091 | 45 | 83 | 104 | 2.5% |
| Q3 2019 | 274 | $3.1B | 50,007,418 | 43 | 89 | 81 | 3.7% |
| Q2 2019 | 269 | $3.3B | 47,670,183 | 53 | 91 | 90 | 7.3% |
| Q1 2019 | 267 | $3.1B | 46,991,015 | 77 | 77 | 83 | 4.4% |
| Q4 2018 | 204 | $1.9B | 48,405,899 | 2 | 7 | 4 | 4.9% |