Tandem Diabetes Care Ownership | Who Owns Tandem Diabetes Care?
Tandem Diabetes Care Ownership Summary
Tandem Diabetes Care is owned by 120.68% institutional investors, 0.97% insiders. Blackrock funding, inc. /de is the largest institutional shareholder, holding 16.21% of TNDM shares. iShares Core S&P Small-Cap ETF is the top mutual fund, with 5.87% of its assets in Tandem Diabetes Care shares.
TNDM Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Tandem Diabetes Care | 120.68% | 0.97% | -21.65% |
| Sector | Healthcare Stocks | 487.91% | 11.08% | -398.99% |
| Industry | Medical Device Stocks | 52.25% | 10.55% | 37.19% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Blackrock funding, inc. /de | 10.87M | 16.21% | $202.65M |
| Vanguard group | 7.44M | 11.35% | $267.99M |
| Sessa capital im | 5.00M | 7.46% | $93.20M |
| Gw&k investment management | 2.89M | 4.31% | $53.87M |
| Arrowmark colorado | 2.70M | 4.03% | $50.32M |
| Hood river capital management | 2.56M | 3.83% | $47.81M |
| Paradice investment management | 2.20M | 3.28% | $26.67M |
| Jennison associates | 1.66M | 2.47% | $30.92M |
| Geode capital management | 1.53M | 2.34% | $55.26M |
| Ophir asset management pty | 1.46M | 2.18% | $24.42M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Paradice investment management | 2.20M | 5.98% | $26.67M |
| Ophir asset management pty | 1.46M | 3.88% | $24.42M |
| Sessa capital im | 5.00M | 2.73% | $93.20M |
| 1492 capital management | 188.75K | 1.62% | $3.52M |
| Dafna capital management | 294.21K | 1.51% | $5.48M |
| Lisanti capital growth | 253.84K | 1.31% | $4.73M |
| Sector gamma as | 210.52K | 1.28% | $3.92M |
| Arrowmark colorado | 2.70M | 0.91% | $50.32M |
| Formula growth | 122.10K | 0.86% | $2.28M |
| Hood river capital management | 2.56M | 0.67% | $47.81M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Ophir asset management pty | 1.46M | 3.88% | 1.46M |
| Walleye capital | 567.22K | 0.04% | 567.22K |
| Sessa capital im | 5.00M | 2.73% | 533.69K |
| Baillie gifford | 746.11K | 0.02% | 523.84K |
| Fmr | 1.09M | 0.00% | 521.96K |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Stephens investment management group | - | - | -1.74M |
| Park west asset management | - | - | -1.12M |
| Gilder gagnon howe | - | - | -931.89K |
| Janus henderson group | 29.81K | 0.00% | -883.73K |
| Fred alger management | 667.35K | 0.06% | -786.89K |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Ophir asset management pty | 1.46M | 3.88% | 1.46M | $24.42M |
| Adage capital partners gp | 250.00K | 0.01% | 250.00K | $4.66M |
| Susquehanna portfolio strategies | 246.99K | 0.10% | 246.99K | $4.60M |
| Pdt partners | 170.42K | 0.18% | 170.42K | $3.18M |
| Centiva capital, lp | 61.00K | 0.02% | 61.00K | $1.14M |
Sold Out
| Holder | Change |
|---|---|
| Mendota financial group | -5.00 |
| Bryn mawr trust | -5.00 |
| Bruce g. allen investments | -8.00 |
| Capital performance advisors llp | -9.00 |
| Cva family office | -11.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| Jun 30, 2025 | 280 | - | 80,915,452 | 10.87% | 120 | 1.00% | 153 | 4.79% | 71 | -15.48% |
| Mar 31, 2025 | 8 | -97.58% | 4,001,503 | -94.45% | 6 | 0.05% | 3 | -98.36% | 4 | -95.40% |
| Dec 31, 2024 | 210 | -40.17% | 44,265,510 | -39.39% | 67 | 0.54% | 119 | -29.59% | 53 | -54.70% |
| Sep 30, 2024 | 350 | 4.79% | 73,035,126 | -0.74% | 111 | 0.87% | 169 | -9.14% | 117 | 24.47% |
| Jun 30, 2024 | 334 | 9.15% | 73,578,824 | -0.68% | 113 | 0.88% | 186 | 6.29% | 94 | 13.25% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| iShares Core S&P Small-Cap ETF | 3.97M | 5.87% | - |
| Vanguard Explorer Inv | 2.10M | 3.15% | -151.44K |
| Vanguard US Total Market Shares ETF | 2.08M | 3.13% | 1.77K |
| Vanguard Total Stock Mkt Idx Inv | 2.10M | 3.11% | -46.63K |
| Vanguard Small Cap Index | 1.62M | 2.39% | -10.35K |
| iShares Russell 2000 ETF | 1.61M | 2.39% | - |
| Hood River Small-Cap Growth Instl | 1.48M | 2.19% | 84.58K |
| Stephens SMID Select Growth | 1.11M | 1.67% | -3.08K |
| Paradice Global Small Mid Cap Strategy | 1.09M | 1.64% | 164.11K |
| Champlain Small Company Fund, LLC | 977.42K | 1.47% | 120.84K |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| Aug 11, 2025 | Sheridan John F | PRESIDENT & CEO | Buy | $102.32K |
| Aug 08, 2025 | Vosseller Leigh | EVP & CHIEF FINANCIAL OFFICER | Buy | $149.40K |
| Mar 07, 2025 | Kyrillos Jean-Claude | EVP & Chief Operating Officer | Buy | $190.97K |
| Nov 21, 2024 | BLICKENSTAFF KIM D | - | Sell | $941.40K |
| Nov 20, 2024 | BLICKENSTAFF KIM D | - | Sell | $300.00K |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2025 Q4 | - | - |
| 2025 Q3 | 2 | - |
| 2025 Q2 | - | - |
| 2025 Q1 | 1 | - |
| 2024 Q4 | 1 | 2 |
TNDM Ownership FAQ
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