131 tracked 13F filers disclose a position in CATX as of the latest SEC 13F filings, a combined $328.4M 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 | TCG Crossover Management, LLC | $33.0M | 7.9M | ▲New +7.9M sh | Q1 2026 | |
| 2 | Commodore Capital LP | $26.4M | 6.3M | ▲New +6.3M sh | Q1 2026 | |
| 3 | STATE STREET CORP | $20.6M | 6.1M | ▲+93% Added · +2.9M sh | Q2 2026 | |
| 4 | Avidity Partners Management LP | $25.2M | 6.0M | ▲+88% Added · +2.8M sh | Q1 2026 | |
| 5 | BlackRock, Inc. | $22.3M | 5.3M | ▲+17% Added · +789K sh | Q1 2026 | |
| 6 | Opaleye Management Inc. | $19.5M | 4.7M | ▲+295% Added · +3.5M sh | Q1 2026 | |
| 7 | VANGUARD CAPITAL MANAGEMENT LLC | $18.3M | 4.4M | →First observed position No prior filed position | Q1 2026 | |
| 8 | MILLENNIUM MANAGEMENT LLC | $16.9M | 4.0M | ▲+188% Added · +2.6M sh | Q1 2026 | |
| 9 | CITADEL ADVISORS LLC | $13.0M | 3.8M | ▲+6.7% Added · +239K sh | Q2 2026 | |
| 10 | Spruce Street Capital LP | $12.6M | 3.7M | ▲+41% Added · +1.1M sh | Q2 2026 | |
| 11 | Affinity Asset Advisors, LLC | $13.2M | 3.2M | ▲11× Added · +2.9M sh | Q1 2026 | |
| 12 | BALYASNY ASSET MANAGEMENT L.P. | $12.5M | 3.0M | ▲New +3.0M sh | Q1 2026 | |
| 13 | MORGAN STANLEY | $12.4M | 3.0M | ▼−33% Reduced · −1.5M sh | Q1 2026 | |
| 14 | GEODE CAPITAL MANAGEMENT, LLC | $8.4M | 2.5M | ▲+39% Added · +692K sh | Q2 2026 | |
| 15 | Nantahala Capital Management, LLC | $7.9M | 2.3M | ▲New +2.3M sh | Q2 2026 | |
| 16 | Nicholson Wealth Management Group, LLC | $5.5M | 1.6M | ▲+0.1% Added · +1K sh | Q2 2026 | |
| 17 | GOLDMAN SACHS GROUP INC | $5.2M | 1.2M | ▲+677% Added · +1.1M sh | Q1 2026 | |
| 18 | Yu Fan | $3.6M | 1.1M | —Held | Q2 2026 | |
| 19 | TWO SIGMA INVESTMENTS, LP | $4.2M | 1.0M | ▼−16% Reduced · −195K sh | Q1 2026 | |
| 20 | Ally Bridge Group (NY) LLC | $3.9M | 927K | ▲New +927K sh | Q1 2026 | |
| 21 | Nuveen, LLC | $3.8M | 910K | ▼−29% Reduced · −364K sh | Q1 2026 | |
| 22 | Hills Bank & Trust Co | $3.0M | 872K | —Held | Q2 2026 | |
| 23 | Octagon Capital Advisors LP | $3.3M | 792K | ▲New +792K sh | Q1 2026 | |
| 24 | VANGUARD PORTFOLIO MANAGEMENT LLC | $3.1M | 752K | →First observed position No prior filed position | Q1 2026 | |
| 25 | ADAR1 Capital Management, LLC | $3.1M | 749K | ▲+687% Added · +654K 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, 18 funds opened a new position in CATX and 21 added to an existing one, while 3 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 |
|---|---|---|
| JPMORGAN CHASE & COJPM | 50 funds | $23.3B |
| APPLE INCAAPL | 49 funds | $121.8B |
| AMAZON.COM INCAMZN | 49 funds | $76.4B |
| ALPHABET INC-CL AGOOGL | 49 funds | $59.6B |
| ELI LILLY & COLLY | 49 funds | $32.0B |
| GILEAD SCIENCES INCGILD | 49 funds | $8.3B |
| NVIDIA CORPNVDA | 48 funds | $161.2B |
| MICROSOFT CORPMSFT | 48 funds | $106.0B |
| META PLATFORMS INC-CLASS AMETA | 48 funds | $48.0B |
| BERKSHIRE HATHAWAY INC-CL BBRK/B | 48 funds | $16.0B |
| BANK OF AMERICA CORPBAC | 48 funds | $12.4B |
| ALPHABET INC-CL CGOOG | 47 funds | $54.2B |
Ranked by how many of CATX's institutional holders also hold each name, a cross-fund conviction signal.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Sep 2, 2026 | Lantheus Alpha Therapy, LLC | 10% Owner | Sell (S) | 42K | $131K |
| Sep 1, 2026 | Lantheus Alpha Therapy, LLC | 10% Owner | Sell (S) | 36K | $112K |
| Sep 1, 2026 | Lantheus Holdings, Inc. | 10% Owner | Sell (S) | 36K | $112K |
| Aug 31, 2026 | Lantheus Alpha Therapy, LLC | 10% Owner | Sell (S) | 78K | $246K |
| Aug 31, 2026 | Lantheus Holdings, Inc. | 10% Owner | Sell (S) | 78K | $246K |
| Nov 13, 2025 | Hunt Jonathan Robert | Chief Accounting Officer | Buy (P) | 11K | $22K |
| Nov 12, 2025 | Williamson Robert F III | Director | Buy (P) | 9K | $20K |
| Mar 31, 2025 | Woods Lori A | Director | Buy (P) | 23K | $50K |
| Mar 31, 2025 | Williamson Robert F III | Director | Buy (P) | 38K | $82K |
| Mar 28, 2025 | Graham Juan | Chief Financial Officer | Buy (P) | 33K | $75K |
| Mar 28, 2025 | Williamson Robert F III | Director | Buy (P) | 22K | $50K |
| Mar 28, 2025 | Spoor Johan M. | Chief Executive Officer, Director | Buy (P) | 5K | $10K |
| Class | 13F holders | Value held |
|---|---|---|
| CATXthis pageStock | 131 funds | $328.5M |
| ISREURCOM | 1 funds | $853K |
| 46489V902CALL | 1 funds | $834K |
Same issuer, multiple share classes. The consensus leaderboards count this company once across all classes; this is the per-class detail.
Connected entities for CATX
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/CATX/capital-change-brief"
Use Arkolith's capital_change_brief for CATX. 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 CATX. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.