Who owns TANDEM DIABETES CARE INC?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of TNDM from SEC Form 13F filings across 274 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.
As of the 2026-06-30 reporting period, 274 institutions disclosed 78.7M shares of TANDEM DIABETES CARE INC worth $1.19B — about 114.1% of shares outstanding; the largest disclosed holder is BlackRock, Inc.. Source: SEC Form 13F filings, parsed by EvidInvest.
274
13F holders
$1.19B
value, 2026 filers
114.1%
of shares outstanding (78.7M sh)
50
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% | 16.8% | +8.3% |
| 2 | Sessa Capital IM, L.P. | 5.1M | $77.0M | 1.3% | 7.4% | +7.8% |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | 4.3M | $64.9M | 0.0% | 6.2% | +7.7% |
| 4 | First Light Asset Management, LLC | 3.4M | $51.1M | 3.1% | 4.9% | +157.4% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 3.1M | $46.7M | 0.0% | 4.5% | +1.9% |
| 6 | STATE STREET CORP | 2.9M | $43.0M | 0.0% | 4.1% | +7.1% |
| 7 | GW&K Investment Management, LLC | 2.6M | $38.8M | 0.3% | 3.7% | -4.5% |
| 8 | JENNISON ASSOCIATES LLC | 2.3M | $35.2M | 0.0% | 3.4% | +40.6% |
| 9 | Paradice Investment Management LLC | 2.0M | $30.5M | 4.9% | 2.9% | -0.9% |
| 10 | JACOBS LEVY EQUITY MANAGEMENT, INC | 2.0M | $30.3M | 0.1% | 2.9% | +31.7% |
| 11 | Freestone Grove Partners LP | 1.9M | $28.2M | 0.2% | 2.7% | +40.2% |
| 12 | GEODE CAPITAL MANAGEMENT, LLC | 1.8M | $27.2M | 0.0% | 2.6% | +7.2% |
| 13 | Driehaus Capital Management LLC | 1.8M | $27.0M | 0.2% | 2.6% | -22.5% |
| 14 | CITADEL ADVISORS LLC | 1.7M | $26.2M | 0.0% | 2.5% | -20.8% |
| 15 | MILLENNIUM MANAGEMENT LLC | 1.3M | $19.8M | 0.0% | 1.9% | +72.2% |
| 16 | Woodline Partners LPNEW | 1.3M | $19.7M | 0.1% | 1.9% | new |
| 17 | ArrowMark Colorado Holdings LLC | 1.3M | $19.6M | 0.8% | 1.9% | -58.1% |
| 18 | UBS Group AG | 1.1M | $17.3M | 0.0% | 1.7% | -44.0% |
| 19 | FMR LLC | 976,432 | $14.7M | 0.0% | 1.4% | +36.8% |
| 20 | ROYCE & ASSOCIATES LP | 900,590 | $13.6M | 0.1% | 1.3% | +29.3% |
| 21 | WELLINGTON MANAGEMENT GROUP LLP | 871,811 | $13.2M | 0.0% | 1.3% | -16.4% |
| 22 | GOLDMAN SACHS GROUP INC | 862,301 | $13.0M | 0.0% | 1.2% | -61.1% |
| 23 | NORTHERN TRUST CORP | 753,690 | $11.4M | 0.0% | 1.1% | +6.7% |
| 24 | Verition Fund Management LLC | 700,000 | $10.6M | 0.1% | 1% | +553.5% |
| 25 | ExodusPoint Capital Management, LP | 691,789 | $10.4M | 0.1% | 1% | +9.3% |
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.