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.
| # | 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 | ▲New +4.0M sh | 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 | ▲New +3.0M sh | Q1 2026 | |
| 6 | STATE STREET CORP | $51.0M | 2.7M | ▲+0.8% Added · +21K sh | Q1 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 | $39.2M | 2.0M | ▼−1.7% Reduced · −35K sh | Q1 2026 | |
| 11 | TWO SIGMA INVESTMENTS, LP | $35.7M | 1.9M | ▲+55% Added · +663K sh | Q1 2026 | |
| 12 | GEODE CAPITAL MANAGEMENT, LLC | $32.2M | 1.7M | ▲+1.8% Added · +30K sh | Q1 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 | Soleus Capital Management, L.P. | $15.0M | 783K | ▲New +783K sh | Q1 2026 | |
| 23 | Defilade Capital Management, L.P. | $14.6M | 762K | ▲New +762K sh | Q1 2026 | |
| 24 | MILLENNIUM MANAGEMENT LLC | $14.6M | 762K | ▲+31% Added · +178K sh | Q1 2026 | |
| 25 | FMR LLC | $13.7M | 714K | ▲+6.1% Added · +41K 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.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Jul 15, 2026 | Kyrillos Jean-Claude | EVP & Chief Operating Officer | Option exercise (M) | 4K | $0 |
| Jul 15, 2026 | Kyrillos Jean-Claude | EVP & Chief Operating Officer | Tax withholding (F) | 2K | $29K |
| Jul 15, 2026 | Kyrillos Jean-Claude | EVP & Chief Operating Officer | Option exercise (M) | 4K | $0 |
| Jun 2, 2026 | Gasser Elizabeth Anne | EVP, Chief Strategy Officer | Gift (G) | 7K | $0 |
| Jun 2, 2026 | Gasser Elizabeth Anne | EVP, Chief Strategy Officer | Gift (G) | 7K | $0 |
| May 29, 2026 | Carpenter Rick | EVP & Chief Technology Officer | Grant (A) | 26K | $0 |
| May 29, 2026 | Gasser Elizabeth Anne | EVP, Chief Strategy Officer | Grant (A) | 29K | $0 |
| May 29, 2026 | Hansen Shannon Marie | EVP & Chief Legal Officer | Grant (A) | 29K | $0 |
| May 29, 2026 | Sheridan John F | PRESIDENT & CEO, Director | Grant (A) | 191K | $0 |
| May 29, 2026 | Kyrillos Jean-Claude | EVP & Chief Operating Officer | Grant (A) | 29K | $0 |
| May 29, 2026 | Morrison Susan | EVP & Chief Admin. Officer | Grant (A) | 29K | $0 |
| May 29, 2026 | Vosseller Leigh | EVP & CHIEF FINANCIAL OFFICER | Grant (A) | 63K | $0 |
| Company | Co-held by | Combined value |
|---|---|---|
| MICROSOFT CORPMSFT | 82 funds | $34.2B |
| AMAZON.COM INCAMZN | 81 funds | $27.4B |
| ELI LILLY & COLLY | 81 funds | $8.9B |
| BANK OF AMERICA CORPBAC | 81 funds | $4.0B |
| SCHWAB (CHARLES) CORPSCHW | 81 funds | $2.1B |
| NVIDIA CORPNVDA | 80 funds | $50.8B |
| META PLATFORMS INC-CLASS AMETA | 80 funds | $16.5B |
| DANAHER CORPDHR | 80 funds | $2.4B |
| APPLE INCAAPL | 79 funds | $39.4B |
| ALPHABET INC-CL AGOOGL | 79 funds | $23.2B |
| BROADCOM INCAVGO | 79 funds | $18.2B |
| JPMORGAN CHASE & COJPM | 79 funds | $11.6B |
Ranked by how many of TNDM's institutional holders also hold each name, a cross-fund conviction signal. Via the MCP server (ticker.co_held).
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. Every panel above is one call to the Arkolith API & MCP server.