Tandem Diabetes Care Ownership | Who Owns Tandem Diabetes Care?
Tandem Diabetes Care Ownership Summary
Tandem Diabetes Care is owned by 109.01% institutional investors, 0.98% insiders. Blackrock funding, inc. /de is the largest institutional shareholder, holding 18.05% 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 | 109.01% | 0.98% | -9.99% |
| Sector | Healthcare Stocks | 42.54% | 10.83% | 46.63% |
| Industry | Medical Device Stocks | 37.80% | 10.13% | 52.07% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Blackrock funding, inc. /de | 12.10M | 18.05% | $146.91M |
| Vanguard group | 7.06M | 10.53% | $85.75M |
| Sessa capital im | 5.00M | 7.46% | $60.70M |
| Arrowmark colorado | 3.69M | 5.51% | $44.81M |
| Gw&k investment management | 2.72M | 4.06% | $33.04M |
| State street | 2.67M | 3.98% | $32.39M |
| Hood river capital management | 2.55M | 3.81% | $30.98M |
| Paradice investment management | 2.20M | 3.28% | $26.67M |
| Freestone grove partners lp | 1.87M | 2.79% | $22.71M |
| Geode capital management | 1.60M | 2.38% | $19.41M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Paradice investment management | 2.20M | 5.98% | $26.67M |
| Kent lake pr | 250.00K | 1.53% | $3.04M |
| Sessa capital im | 5.00M | 1.44% | $60.70M |
| Dafna capital management | 355.21K | 1.07% | $4.31M |
| Arrowmark colorado | 3.69M | 0.83% | $44.81M |
| Sector gamma as | 269.54K | 0.81% | $3.27M |
| Bryce point capital | 42.26K | 0.63% | $513.01K |
| Formula growth | 122.10K | 0.53% | $1.48M |
| Hood river capital management | 2.55M | 0.37% | $30.98M |
| Gw&k investment management | 2.72M | 0.29% | $33.04M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Freestone grove partners lp | 1.87M | 0.17% | 1.87M |
| Blackrock funding, inc. /de | 12.10M | 0.00% | 1.23M |
| Arrowmark colorado | 3.69M | 0.83% | 991.65K |
| Barclays | 1.19M | 0.00% | 623.05K |
| Acadian asset management | 918.72K | 0.02% | 560.21K |
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 |
| Brown advisory | - | - | -1.06M |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Freestone grove partners lp | 1.87M | 0.17% | 1.87M | $22.71M |
| Royce & associates lp | 510.00K | 0.06% | 510.00K | $6.19M |
| Cubist systematic strategies | 439.16K | 0.03% | 439.16K | $5.33M |
| Kent lake pr | 250.00K | 1.53% | 250.00K | $3.04M |
| Panagora asset management | 195.22K | 0.01% | 195.22K | $2.37M |
Sold Out
| Holder | Change |
|---|---|
| Mendota financial group | -5.00 |
| Bryn mawr trust | -5.00 |
| Wealthtrak capital management | -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 % |
|---|---|---|---|---|---|---|---|---|---|---|
| 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% |
| Sep 30, 2024 | 350 | 4.79% | 73,035,126 | -0.74% | 111 | 0.87% | 169 | -9.14% | 117 | 24.47% |
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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