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 15.72% of TNDM shares. iShares Core S&P Small-Cap ETF is the top mutual fund, with 6.04% 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 | 232.80% | 10.63% | -143.43% |
| Industry | Medical Device Stocks | 38.12% | 10.22% | 51.67% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Blackrock funding, inc. /de | 10.69M | 15.72% | $204.94M |
| Vanguard group | 7.34M | 10.85% | $161.36M |
| Sessa capital im | 4.73M | 6.96% | $90.69M |
| Arrowmark colorado | 3.10M | 4.56% | $59.50M |
| Gw&k investment management | 2.69M | 3.95% | $51.55M |
| State street | 2.66M | 3.91% | $51.04M |
| Hood river capital management | 2.55M | 3.81% | $30.98M |
| Driehaus capital management | 2.30M | 3.39% | $44.18M |
| Goldman sachs group | 2.22M | 3.26% | $42.54M |
| Citadel advisors | 2.19M | 3.22% | $42.03M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Paradice investment management | 2.04M | 7.35% | $39.15M |
| Beaconlight capital | 253.88K | 2.56% | $4.87M |
| First light asset management | 1.31M | 2.26% | $25.20M |
| Sessa capital im | 4.73M | 1.65% | $90.69M |
| Arrowmark colorado | 3.10M | 1.58% | $59.50M |
| Dafna capital management | 355.21K | 1.55% | $6.81M |
| Kent lake pr | 250.00K | 1.53% | $3.04M |
| Sector gamma as | 267.09K | 1.21% | $5.12M |
| Lisanti capital growth | 165.32K | 0.80% | $3.17M |
| Nierenberg investment management company | 79.51K | 0.76% | $1.52M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Ubs group | 2.05M | 0.01% | 1.63M |
| Wellington management group llp | 1.04M | 0.00% | 944.46K |
| Soleus capital management | 783.00K | 0.61% | 783.00K |
| Driehaus capital management | 2.30M | 0.32% | 694.07K |
| Two sigma investments, lp | 1.86M | 0.03% | 662.67K |
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 |
|---|---|---|---|---|
| Soleus capital management | 783.00K | 0.61% | 783.00K | $15.01M |
| Exoduspoint capital management, lp | 632.90K | 0.10% | 632.90K | $12.13M |
| Vanguard fiduciary trust | 471.66K | 0.00% | 471.66K | $9.04M |
| Cubist systematic strategies | 439.16K | 0.03% | 439.16K | $5.33M |
| Point72 asset management | 420.48K | 0.01% | 420.48K | $8.06M |
Sold Out
| Holder | Change |
|---|---|
| Dunhill financial | -1.00 |
| Bryn mawr trust | -5.00 |
| Mendota financial group | -5.00 |
| Wealthtrak capital management | -5.00 |
| Nemes rush group | -8.00 |
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 | 4.14M | 6.04% | 1.03K |
| Vanguard Total Stock Mkt Idx Inv | 2.16M | 3.15% | 4.35K |
| Vanguard US Total Market Shares ETF | 2.08M | 3.13% | 1.77K |
| iShares Russell 2000 ETF | 1.59M | 2.33% | 13.44K |
| Vanguard Small Cap Index | 1.57M | 2.30% | 35.75K |
| 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 |
| 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 Q2 | - | - |
| 2026 Q1 | - | 2 |
| 2025 Q4 | - | - |
| 2025 Q3 | 2 | - |
| 2025 Q2 | - | - |
TNDM Ownership FAQ
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