Tandem Diabetes Care Ownership | Who Owns Tandem Diabetes Care?
Tandem Diabetes Care Ownership Summary
Tandem Diabetes Care is owned by 115.91% institutional investors, 1.15% insiders. Blackrock funding, inc. /de is the largest institutional shareholder, holding 16.94% of TNDM shares. iShares Core S&P Small-Cap ETF is the top mutual fund, with 6.00% of its assets in Tandem Diabetes Care shares.
TNDM Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Tandem Diabetes Care | 115.91% | 1.15% | -17.06% |
| Sector | Healthcare Stocks | 50.50% | 12.33% | 37.17% |
| Industry | Medical Device Stocks | 49.22% | 12.60% | 38.18% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Blackrock funding, inc. /de | 11.58M | 16.94% | $174.79M |
| Vanguard group | 7.34M | 10.85% | $161.36M |
| Sessa capital im | 5.10M | 7.46% | $76.96M |
| First light asset management | 3.38M | 4.95% | $51.06M |
| Vanguard capital management | 3.10M | 4.53% | $46.73M |
| State street | 2.85M | 4.17% | $43.03M |
| Hood river capital management | 2.55M | 3.81% | $30.98M |
| Gw&k investment management | 2.57M | 3.76% | $38.77M |
| Jennison associates | 2.33M | 3.41% | $35.18M |
| Paradice investment management | 2.02M | 2.96% | $30.54M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Paradice investment management | 2.02M | 4.87% | $30.54M |
| First light asset management | 3.38M | 3.10% | $51.06M |
| Kent lake pr | 250.00K | 1.53% | $3.04M |
| Beaconlight capital | 266.01K | 1.42% | $4.01M |
| Sessa capital im | 5.10M | 1.29% | $76.96M |
| Nierenberg investment management company | 158.91K | 1.19% | $2.40M |
| Dafna capital management | 355.21K | 1.02% | $5.36M |
| Sector gamma as | 267.09K | 0.87% | $4.03M |
| Arrowmark colorado | 1.30M | 0.82% | $19.61M |
| Bryce point capital | 42.26K | 0.63% | $513.01K |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| First light asset management | 3.38M | 3.10% | 2.07M |
| Woodline partners lp | 1.31M | 0.06% | 1.31M |
| Blackrock funding, inc. /de | 11.58M | 0.00% | 892.28K |
| Jennison associates | 2.33M | 0.02% | 672.98K |
| Sixth street partners management company | 656.84K | 0.00% | 656.84K |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Arrowmark colorado | 1.30M | 0.82% | -1.80M |
| Stephens investment management group | - | - | -1.74M |
| Ophir asset management pty | - | - | -1.46M |
| Champlain investment partners | - | - | -1.46M |
| Marshall wace, llp | - | - | -1.44M |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Woodline partners lp | 1.31M | 0.06% | 1.31M | $19.73M |
| Sixth street partners management company | 656.84K | 0.00% | 656.84K | $9.91M |
| Cubist systematic strategies | 439.16K | 0.03% | 439.16K | $5.33M |
| Alberta investment management | 313.70K | 0.03% | 313.70K | $4.73M |
| Meridiem capital partners lp | 298.25K | 0.20% | 298.25K | $4.50M |
Sold Out
| Holder | Change |
|---|---|
| Dunhill financial | -1.00 |
| Abound wealth management | -5.00 |
| Mendota financial group | -5.00 |
| Bryn mawr trust | -5.00 |
| Wealthtrak capital management | -5.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| Jun 30, 2026 | 284 | -0.35% | 79,278,890 | 0.79% | 115 | 0.87% | 144 | - | 89 | -2.20% |
| Mar 31, 2026 | 123 | -56.23% | 16,752,734 | -77.62% | 24 | 0.20% | 50 | -62.96% | 46 | -53.06% |
| Dec 31, 2025 | 201 | -24.72% | 50,101,098 | -33.24% | 74 | 0.59% | 105 | -8.70% | 62 | -37.37% |
| Sep 30, 2025 | 253 | -10.28% | 73,090,625 | -9.73% | 109 | 0.75% | 109 | -29.68% | 95 | 35.71% |
| Jun 30, 2025 | 280 | - | 80,915,452 | 10.87% | 120 | 1.00% | 153 | 4.79% | 71 | -15.48% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| iShares Core S&P Small-Cap ETF | 4.17M | 6.00% | 2.88K |
| Vanguard Total Stock Mkt Idx Inv | 2.19M | 3.19% | 27.30K |
| Vanguard Morn Total Stk Mkt Idx Investor | 2.19M | 3.19% | 27.30K |
| Vanguard US Total Market Shares ETF | 2.08M | 3.13% | 1.77K |
| iShares Russell 2000 ETF | 1.78M | 2.56% | -31.58K |
| Vanguard Small Cap Index | 1.58M | 2.30% | 1.19K |
| Hood River Small-Cap Growth Instl | 1.48M | 2.19% | 84.58K |
| Paradice Global Small Mid Cap Strategy | 1.49M | 2.17% | - |
| Stephens SMID Select Growth | 1.11M | 1.67% | -3.08K |
| Vanguard Explorer Inv | 1.08M | 1.58% | -9.47K |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| Mar 17, 2026 | Novara Mark David | EVP & CHIEF COMMERCIAL OFFICER | Sell | $4.31K |
| Mar 05, 2026 | Novara Mark David | EVP & CHIEF COMMERCIAL OFFICER | Sell | $45.62 |
| 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 |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2026 Q3 | - | - |
| 2026 Q2 | - | - |
| 2026 Q1 | - | 2 |
| 2025 Q4 | - | - |
| 2025 Q3 | 2 | - |
TNDM Ownership FAQ
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