Who owns Tandem Diabetes Care, Inc.?
Institutional ownership of TNDM from SEC Form 13F filings across 189 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
189
13F holders
$786.8M
value, 2026 filers
76.8%
of shares outstanding (52.6M sh)
32
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30· % of fund = share of the manager's own book · % of co. = share of TNDM's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 11.6M | $174.8M | 0.0% | 16.9% | +8.3% |
| 2 | VANGUARD PORTFOLIO MANAGEMENT LLC | 4.3M | $64.9M | 0.0% | 6.3% | +7.7% |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | 3.1M | $46.7M | 0.0% | 4.5% | -49.1% |
| 4 | JENNISON ASSOCIATES LLC | 2.3M | $35.2M | 0.0% | 3.4% | +40.6% |
| 5 | Freestone Grove Partners LP | 1.9M | $28.2M | 0.2% | 2.7% | +40.2% |
| 6 | GEODE CAPITAL MANAGEMENT, LLC | 1.8M | $27.2M | 0.0% | 2.6% | +7.2% |
| 7 | CITADEL ADVISORS LLC | 1.7M | $26.2M | 0.0% | 2.5% | -20.8% |
| 8 | Verition Fund Management LLC | 1.4M | $21.1M | 0.1% | 2% | +1207.0% |
| 9 | MILLENNIUM MANAGEMENT LLC | 1.3M | $19.8M | 0.0% | 1.9% | +72.2% |
| 10 | Woodline Partners LPNEW | 1.3M | $19.7M | 0.1% | 1.9% | new |
| 11 | UBS Group AG | 1.1M | $17.3M | 0.0% | 1.7% | -44.0% |
| 12 | FMR LLC | 976,432 | $14.7M | 0.0% | 1.4% | +36.8% |
| 13 | WELLINGTON MANAGEMENT GROUP LLP | 871,811 | $13.2M | 0.0% | 1.3% | -16.4% |
| 14 | GOLDMAN SACHS GROUP INC | 862,301 | $13.0M | 0.0% | 1.3% | -61.1% |
| 15 | NORTHERN TRUST CORP | 753,690 | $11.4M | 0.0% | 1.1% | +6.7% |
| 16 | ExodusPoint Capital Management, LP | 691,789 | $10.4M | 0.1% | 1% | +9.3% |
| 17 | Qube Research & Technologies Ltd | 683,823 | $10.3M | 0.0% | 1% | +1216.0% |
| 18 | D. E. Shaw & Co., Inc. | 681,808 | $10.3M | 0.0% | 1% | -13.0% |
| 19 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 667,689 | $10.1M | 0.0% | 1% | +245.0% |
| 20 | Sixth Street Partners Management Company, L.P.NEW | 656,836 | $9.9M | 1.7% | 1% | new |
| 21 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 656,836 | $9.9M | 0.0% | 1% | +2.2% |
| 22 | MORGAN STANLEY | 647,069 | $9.8M | 0.0% | 0.9% | -52.3% |
| 23 | Point72 Asset Management, L.P. | 610,903 | $9.2M | 0.0% | 0.9% | +45.3% |
| 24 | BANK OF MONTREAL /CAN/ | 564,966 | $8.5M | 0.0% | 0.8% | +1409.2% |
| 25 | TWO SIGMA INVESTMENTS, LP | 558,409 | $8.4M | 0.0% | 0.8% | -70.0% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.