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 5.89% 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 | 488.17% | 11.08% | -399.26% |
| Industry | Medical Device Stocks | 52.08% | 10.61% | 37.30% |
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 | 1.77M | 2.64% | $32.94M |
| Stephens investment management group | 1.74M | 2.59% | $32.39M |
| Jennison associates | 1.66M | 2.47% | $30.92M |
| Geode capital management | 1.53M | 2.34% | $55.26M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Paradice investment management | 1.77M | 6.69% | $32.94M |
| 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 |
|---|---|---|---|
| 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 |
| Bellevue group | - | - | -782.46K |
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 |
| Bruce g. allen investments | -8.00 |
| Capital performance advisors llp | -9.00 |
| Cva family office | -11.00 |
| Capital advisors | -13.00 |
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 | 5.89% | 654.00 |
| 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 | 1.58M | 2.34% | -30.03K |
| 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 Q3 | 2 | - |
| 2025 Q2 | - | - |
| 2025 Q1 | 1 | - |
| 2024 Q4 | 1 | 2 |
| 2024 Q3 | - | - |
TNDM Ownership FAQ
Try Tickergate Pro Free
Customize Everything. 100% Flexibility. Fast and Easy to Use (No code or Excel Needed)
Customize your own personal stocks lists, views and charts
Choose from hundreds of fields, up to 15 years of history
Conduct deep comparison analysis
Discover trending investment themes
Find your next best investment
Research stocks using tools