247 tracked 13F filers disclose a position in TNDM as of the latest SEC 13F filings, a combined $1.3B in reported value. Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | $204.9M | 10.7M | ▼−4.1% Reduced · −458K sh | Q1 2026 | |
| 2 | Sessa Capital IM, L.P. | $90.7M | 4.7M | ▼−5.4% Reduced · −269K sh | Q1 2026 | |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | $76.6M | 4.0M | →First observed position No prior filed position | Q1 2026 | |
| 4 | ArrowMark Colorado Holdings LLC | $59.5M | 3.1M | ▲+7.4% Added · +214K sh | Q1 2026 | |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | $58.3M | 3.0M | →First observed position No prior filed position | Q1 2026 | |
| 6 | STATE STREET CORP | $43.0M | 2.9M | ▲+7.1% Added · +189K sh | Q2 2026 | |
| 7 | GOLDMAN SACHS GROUP INC | $42.5M | 2.2M | ▲+32% Added · +536K sh | Q1 2026 | |
| 8 | CITADEL ADVISORS LLC | $42.0M | 2.2M | ▲+5.0% Added · +104K sh | Q1 2026 | |
| 9 | UBS Group AG | $39.3M | 2.0M | ▲+390% Added · +1.6M sh | Q1 2026 | |
| 10 | Paradice Investment Management LLC | $30.5M | 2.0M | ▼−0.9% Reduced · −18K sh | Q2 2026 | |
| 11 | TWO SIGMA INVESTMENTS, LP | $35.7M | 1.9M | ▲+55% Added · +663K sh | Q1 2026 | |
| 12 | GEODE CAPITAL MANAGEMENT, LLC | $27.2M | 1.8M | ▲+7.2% Added · +121K sh | Q2 2026 | |
| 13 | JENNISON ASSOCIATES LLC | $31.8M | 1.7M | ▼−18% Reduced · −363K sh | Q1 2026 | |
| 14 | JACOBS LEVY EQUITY MANAGEMENT, INC | $29.2M | 1.5M | ▼−7.8% Reduced · −130K sh | Q1 2026 | |
| 15 | MARSHALL WACE, LLP | $27.7M | 1.4M | ▲+65% Added · +567K sh | Q1 2026 | |
| 16 | MORGAN STANLEY | $26.0M | 1.4M | ▼−35% Reduced · −723K sh | Q1 2026 | |
| 17 | Freestone Grove Partners LP | $25.5M | 1.3M | ▼−7.8% Reduced · −112K sh | Q1 2026 | |
| 18 | First Light Asset Management, LLC | $25.2M | 1.3M | ▲+21% Added · +225K sh | Q1 2026 | |
| 19 | BAILLIE GIFFORD & CO | $20.9M | 1.1M | ▼−4.9% Reduced · −56K sh | Q1 2026 | |
| 20 | VOYA INVESTMENT MANAGEMENT LLC | $15.4M | 804K | ▲+152% Added · +485K sh | Q1 2026 | |
| 21 | D. E. Shaw & Co., Inc. | $15.0M | 784K | ▼−8.2% Reduced · −70K sh | Q1 2026 | |
| 22 | Defilade Capital Management, L.P. | $14.6M | 762K | ▲New +762K sh | Q1 2026 | |
| 23 | MILLENNIUM MANAGEMENT LLC | $14.6M | 762K | ▲+31% Added · +178K sh | Q1 2026 | |
| 24 | FMR LLC | $13.7M | 714K | ▲+6.1% Added · +41K sh | Q1 2026 | |
| 25 | NORTHERN TRUST CORP | $13.5M | 707K | ▲+2.1% Added · +15K sh | Q1 2026 |
Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.
Last quarter, 11 funds opened a new position in TNDM and 30 added to an existing one, while 19 reduced and 0 exited entirely — based on 13F filings from active, signal-eligible managers (passive index funds and other mechanical holders are excluded from this count).
| Company | Co-held by | Combined value |
|---|---|---|
| AMAZON.COM INCAMZN | 132 funds | $177.3B |
| META PLATFORMS INC-CLASS AMETA | 132 funds | $95.0B |
| NVIDIA CORPNVDA | 130 funds | $335.5B |
| MICROSOFT CORPMSFT | 129 funds | $225.0B |
| ELI LILLY & COLLY | 129 funds | $67.8B |
| APPLE INCAAPL | 127 funds | $246.3B |
| JPMORGAN CHASE & COJPM | 126 funds | $47.9B |
| CHEVRON CORPCVX | 126 funds | $25.0B |
| UNITEDHEALTH GROUP INCUNH | 126 funds | $23.9B |
| COSTCO WHOLESALE CORPCOST | 125 funds | $32.9B |
| MICRON TECHNOLOGY INCMU | 125 funds | $32.5B |
| BANK OF AMERICA CORPBAC | 125 funds | $26.0B |
Ranked by how many of TNDM's institutional holders also hold each name, a cross-fund conviction signal.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Mar 17, 2026 | Novara Mark David | EVP & CHIEF COMMERCIAL OFFICER | Sell (S) | 187 | $4K |
| Mar 5, 2026 | Novara Mark David | EVP & CHIEF COMMERCIAL OFFICER | Sell (S) | 2 | $46 |
| Aug 11, 2025 | Sheridan John F | PRESIDENT & CEO, Director | Buy (P) | 10K | $102K |
| Aug 8, 2025 | Vosseller Leigh | EVP & CHIEF FINANCIAL OFFICER | Buy (P) | 14K | $149K |
| Mar 7, 2025 | Kyrillos Jean-Claude | EVP & Chief Operating Officer | Buy (P) | 11K | $191K |
| Nov 21, 2024 | BLICKENSTAFF KIM D | Director | Sell (S) | 30K | $941K |
| Nov 20, 2024 | BLICKENSTAFF KIM D | Director | Sell (S) | 10K | $300K |
| Nov 15, 2024 | Novara Mark David | EVP & CHIEF COMMERCIAL OFFICER | Buy (P) | 532 | $12K |
| May 30, 2024 | Allen Dick | Director | Sell (S) | 5K | $258K |
| Nov 27, 2023 | Allen Dick | Director | Buy (P) | 5K | $95K |
| Nov 8, 2023 | Hansen Shannon Marie | Chief Legal Officer | Buy (P) | 2K | $30K |
| Nov 8, 2023 | Vosseller Leigh | EVP & CHIEF FINANCIAL OFFICER | Buy (P) | 6K | $95K |
| Class | 13F holders | Value held |
|---|---|---|
| TNDMthis pagecs | 247 funds | $1.3B |
| TNDM 1.5 03/15/29 2024SDBCV | 22 funds | $332.0M |
Same issuer, multiple share classes. The consensus leaderboards count this company once across all classes; this is the per-class detail.
Connected entities for TNDM
This stock page is the public Follow view. For one current, evidence-backed answer, use capital_change_brief through REST or MCP. It compares tracked 13F changes with qualifying Form 4 activity and cites the SEC evidence.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/stocks/TNDM/capital-change-brief"
Use Arkolith's capital_change_brief for TNDM. Tell me what changed, whether insider activity corroborates it, and cite the SEC evidence.
13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for TNDM. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.