Tandem Diabetes Care Ownership | Who Owns Tandem Diabetes Care?
Tandem Diabetes Care Ownership Summary
Tandem Diabetes Care is owned by 74.06% institutional investors, 1.00% insiders, and 24.95% retail investors. Blackrock funding, inc. /de is the largest institutional shareholder, holding 16.48% of TNDM shares. iShares Core S&P Small-Cap ETF is the top mutual fund, with 5.96% of its assets in Tandem Diabetes Care shares.
TNDM Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Tandem Diabetes Care | 74.06% | 1.00% | 24.95% |
| Sector | Healthcare Stocks | 232.64% | 10.66% | -143.30% |
| Industry | Medical Device Stocks | 37.54% | 10.61% | 51.85% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Blackrock funding, inc. /de | 11.15M | 16.48% | $245.06M |
| Vanguard group | 7.34M | 10.85% | $161.36M |
| Sessa capital im | 5.00M | 7.46% | $60.70M |
| Arrowmark colorado | 3.69M | 5.51% | $44.81M |
| State street | 2.67M | 3.98% | $32.39M |
| Gw&k investment management | 2.68M | 3.95% | $58.80M |
| Hood river capital management | 2.55M | 3.81% | $30.98M |
| Morgan stanley | 2.08M | 3.08% | $45.73M |
| Paradice investment management | 2.08M | 3.07% | $45.67M |
| Jennison associates | 2.02M | 2.99% | $44.43M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Paradice investment management | 2.08M | 8.89% | $45.67M |
| Kent lake pr | 250.00K | 1.53% | $3.04M |
| Sessa capital im | 5.00M | 1.44% | $60.70M |
| Lisanti capital growth | 262.88K | 1.37% | $5.78M |
| Sector gamma as | 267.09K | 1.34% | $5.87M |
| Dafna capital management | 355.21K | 1.07% | $4.31M |
| Arrowmark colorado | 3.69M | 0.83% | $44.81M |
| Bryce point capital | 42.26K | 0.63% | $513.01K |
| Formula growth | 122.10K | 0.53% | $1.48M |
| Gw&k investment management | 2.68M | 0.51% | $58.80M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Freestone grove partners lp | 1.87M | 0.17% | 1.87M |
| Morgan stanley | 2.08M | 0.00% | 1.34M |
| Assenagon asset management | 1.23M | 0.04% | 1.23M |
| Bnp paribas arbitrage, snc | 1.25M | 0.01% | 1.03M |
| Arrowmark colorado | 3.69M | 0.83% | 991.65K |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Stephens investment management group | - | - | -1.74M |
| Ophir asset management pty | - | - | -1.46M |
| Champlain investment partners | - | - | -1.46M |
| Park west asset management | - | - | -1.12M |
| Ubs group | 417.83K | 0.00% | -1.09M |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Freestone grove partners lp | 1.87M | 0.17% | 1.87M | $22.71M |
| Cubist systematic strategies | 439.16K | 0.03% | 439.16K | $5.33M |
| Kent lake pr | 250.00K | 1.53% | 250.00K | $3.04M |
| Norges bank | 54.31K | 0.00% | 54.31K | $1.19M |
| Winton group | 44.24K | 0.03% | 44.24K | $972.48K |
Sold Out
| Holder | Change |
|---|---|
| Wealthtrak capital management | -5.00 |
| Mendota financial group | -5.00 |
| Bryn mawr trust | -5.00 |
| Bruce g. allen investments | -8.00 |
| Capital performance advisors llp | -9.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| 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% |
| 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% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| iShares Core S&P Small-Cap ETF | 4.07M | 5.96% | 1.66K |
| Vanguard Total Stock Mkt Idx Inv | 2.15M | 3.15% | 33.18K |
| Vanguard US Total Market Shares ETF | 2.08M | 3.13% | 1.77K |
| iShares Russell 2000 ETF | 1.65M | 2.41% | -13.44K |
| Vanguard Small Cap Index | 1.54M | 2.25% | 3.23K |
| 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 | 1.09M | 1.60% | -599.02K |
| Champlain Small Company Fund, LLC | 977.42K | 1.47% | 120.84K |
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 Q1 | - | 2 |
| 2025 Q4 | - | - |
| 2025 Q3 | 2 | - |
| 2025 Q2 | - | - |
| 2025 Q1 | 1 | - |
TNDM Ownership FAQ
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