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TANDEM DIABETES (TNDM)
NASDAQ
$20.08+$0.58 (+2.96%)
Price as of Aug 03, 2026 10:37 AM EDT- $1.3BMarket Cap
- 26.62%1-Year Change
- Medical DevicesIndustry
TANDEM DIABETES (TNDM)
$20.08+$0.58 (+2.96%)
Top Holders
Institutional
Mutual Funds
Holder | Ownership %
| Shares Held | Change (Shares, %) | Report Date |
|---|---|---|---|---|
BLACKROCK FUNDING, INC. /DE | 17.07% | 11.7M | +587,379 (+5.02%) | Dec 31, 2024 |
BLACKROCK INC. | 16.23% | 11.1M | +1.9M (+17.00%) | Jun 30, 2024 |
BLACKROCK, INC. | 15.60% | 10.7M | -458,337 (-4.29%) | Mar 31, 2026 |
VANGUARD GROUP INC | 10.71% | 7.3M | +278,042 (+3.79%) | Dec 31, 2025 |
UBS GROUP AG | 7.56% | 5.2M | +2.4M (+46.99%) | Mar 31, 2026 |
SESSA CAPITAL IM, L.P. | 6.90% | 4.7M | -269,243 (-5.69%) | Mar 31, 2026 |
ARROWMARK COLORADO HOLDINGS LLC | 4.53% | 3.1M | +213,918 (+6.89%) | Mar 31, 2026 |
Holder | Ownership %
| Shares Held | Change (Shares, %) | Report Date |
|---|---|---|---|---|
Virtus Investment Trust | 19.65% | 13.5M | +13.5M (+100.00%) | Mar 31, 2026 |
Virtus Strategy Trust | 18.62% | 12.8M | +12.8M (+100.00%) | Mar 31, 2026 |
VANGUARD INDEX FUNDS | 7.83% | 5.4M | +104,043 (+1.94%) | Mar 31, 2026 |
Virtus Convertible & Income Fund | 4.87% | 3.3M | +3.3M (+100.00%) | Apr 30, 2026 |
Virtus Convertible & Income Fund II | 3.87% | 2.7M | +2.7M (+100.00%) | Apr 30, 2026 |
Virtus Dividend, Interest & Premium Strategy Fund | 3.87% | 2.7M | +2.7M (+100.00%) | Apr 30, 2026 |
Virtus Equity & Convertible Income Fund | 3.86% | 2.6M | +2.6M (+100.00%) | Apr 30, 2026 |
Current Ownership Distribution
- Institutions1.3B (63.53%)
- Mutual Funds734.3M (36.38%)
- Insiders1.8M (0.09%)
- Other0 (0.00%)
Insider Transactions
- 0.09% (1.8M)Current InsiderOwnership (%, shares)
- 0Number of InsiderBuying (last 12 months)
- $0.00Amount of InsiderBuying (last 12 months)
- 1Number of InsiderSelling (last 12 months)
- $1.7MAmount of InsiderSelling (last 12 months)
Insider Name & Title | Type | Date
| Transaction Value | Shares | Share Price | Shares After Transactions |
|---|---|---|---|---|---|---|
Kyrillos Jean-Claude EVP & Chief Operating Officer | Exempt | Jul 15, 2026 | $0.00 | 3,636 | $0.00 | 14,545 |
Kyrillos Jean-Claude EVP & Chief Operating Officer | Exempt | Jul 15, 2026 | $0.00 | 3,636 | $0.00 | 31,741 |
Kyrillos Jean-Claude EVP & Chief Operating Officer | In Kind | Jul 15, 2026 | $29,429.28 | 1,926 | $15.28 | 29,815 |
Novara Mark David EVP & CHIEF COMMERCIAL OFFICER | Sell | Mar 17, 2026 | $4,310.35 | 187 | $23.05 | 37,656 |
Novara Mark David EVP & CHIEF COMMERCIAL OFFICER | Exempt | Mar 16, 2026 | $0.00 | 7,414 | $0.00 | 22,244 |
Novara Mark David EVP & CHIEF COMMERCIAL OFFICER | Exempt | Mar 16, 2026 | $0.00 | 7,414 | $0.00 | 43,383 |
Novara Mark David EVP & CHIEF COMMERCIAL OFFICER | In Kind | Mar 16, 2026 | $119,608.60 | 5,540 | $21.59 | 37,843 |
Novara Mark David EVP & CHIEF COMMERCIAL OFFICER | Sell | Mar 05, 2026 | $45.62 | 2 | $22.81 | 35,969 |
Vosseller Leigh EVP & CHIEF FINANCIAL OFFICER | Exempt | Feb 17, 2026 | $0.00 | 1,503 | $0.00 | 1,503 |
Gasser Elizabeth Anne EVP, Chief Strategy Officer | Exempt | Feb 17, 2026 | $0.00 | 1,503 | $0.00 | 1,503 |
Carpenter Rick Chief Technology Officer | Exempt | Feb 17, 2026 | $0.00 | 1,437 | $0.00 | 1,437 |
Novara Mark David EVP & CHIEF COMMERCIAL OFFICER | Exempt | Feb 17, 2026 | $0.00 | 77 | $0.00 | 380 |
Vosseller Leigh EVP & CHIEF FINANCIAL OFFICER | Exempt | Feb 17, 2026 | $0.00 | 1,495 | $0.00 | 7,478 |
Gasser Elizabeth Anne EVP, Chief Strategy Officer | Exempt | Feb 17, 2026 | $0.00 | 1,097 | $0.00 | 5,484 |
Carpenter Rick Chief Technology Officer | Exempt | Feb 17, 2026 | $0.00 | 897 | $0.00 | 4,487 |
Hansen Shannon Marie EVP & Chief Legal Officer | Exempt | Feb 17, 2026 | $0.00 | 531 | $0.00 | 0 |
Vosseller Leigh EVP & CHIEF FINANCIAL OFFICER | Exempt | Feb 17, 2026 | $0.00 | 1,503 | $0.00 | 39,151 |
Gasser Elizabeth Anne EVP, Chief Strategy Officer | Exempt | Feb 17, 2026 | $0.00 | 1,503 | $0.00 | 1,503 |
Carpenter Rick Chief Technology Officer | Exempt | Feb 17, 2026 | $0.00 | 1,437 | $0.00 | 25,689 |
Novara Mark David EVP & CHIEF COMMERCIAL OFFICER | Exempt | Feb 17, 2026 | $0.00 | 77 | $0.00 | 36,033 |
Vosseller Leigh EVP & CHIEF FINANCIAL OFFICER | In Kind | Feb 17, 2026 | $11,730.05 | 619 | $18.95 | 38,532 |
Gasser Elizabeth Anne EVP, Chief Strategy Officer | In Kind | Feb 17, 2026 | $16,808.65 | 887 | $18.95 | 616 |
Carpenter Rick Chief Technology Officer | In Kind | Feb 17, 2026 | $15,311.60 | 808 | $18.95 | 24,881 |
Hansen Shannon Marie EVP & Chief Legal Officer | Exempt | Feb 17, 2026 | $0.00 | 1,437 | $0.00 | 1,437 |
Vosseller Leigh EVP & CHIEF FINANCIAL OFFICER | Exempt | Feb 17, 2026 | $0.00 | 1,495 | $0.00 | 40,027 |
Gasser Elizabeth Anne EVP, Chief Strategy Officer | Exempt | Feb 17, 2026 | $0.00 | 1,097 | $0.00 | 1,713 |
Carpenter Rick Chief Technology Officer | Exempt | Feb 17, 2026 | $0.00 | 897 | $0.00 | 25,778 |
Novara Mark David EVP & CHIEF COMMERCIAL OFFICER | In Kind | Feb 17, 2026 | $1,174.90 | 62 | $18.95 | 35,971 |
Vosseller Leigh EVP & CHIEF FINANCIAL OFFICER | In Kind | Feb 17, 2026 | $11,673.20 | 616 | $18.95 | 39,411 |
Gasser Elizabeth Anne EVP, Chief Strategy Officer | In Kind | Feb 17, 2026 | $12,260.65 | 647 | $18.95 | 1,066 |