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/CSTL/capital-change-brief"
Use Arkolith's capital_change_brief for CSTL. 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. | $73.2M | 3.0M | ▼−3.9% Reduced · −122K sh | Q1 2026 | |
| 2 | RTW INVESTMENTS, LP | $67.7M | 2.8M | ▲+30% Added · +643K sh | Q1 2026 | |
| 3 | PRINCIPAL FINANCIAL GROUP INC | $43.5M | 1.8M | ▼−2.1% Reduced · −38K sh | Q1 2026 | |
| 4 | Portolan Capital Management, LLC | $33.1M | 1.4M | ▼−22% Reduced · −379K sh | Q1 2026 | |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | $28.9M | 1.2M | ▲New +1.2M sh | Q1 2026 | |
| 6 | DIMENSIONAL FUND ADVISORS LP | $25.5M | 1.0M | ▼−9.1% Reduced · −104K sh | Q1 2026 | |
| 7 | SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC | $23.1M | 941K | ▼−11% Reduced · −118K sh | Q1 2026 | |
| 8 | VANGUARD PORTFOLIO MANAGEMENT LLC | $21.2M | 862K | ▲New +862K sh | Q1 2026 | |
| 9 | Allianz Asset Management GmbH | $19.9M | 811K | ▲+30% Added · +189K sh | Q1 2026 | |
| 10 | STATE STREET CORP | $18.9M | 769K | ▲+4.4% Added · +33K sh | Q1 2026 | |
| 11 | GEODE CAPITAL MANAGEMENT, LLC | $17.9M | 728K | ▲+1.8% Added · +13K sh | Q1 2026 | |
| 12 | Qube Research & Technologies Ltd | $13.7M | 560K | ▲+138% Added · +324K sh | Q1 2026 | |
| 13 | PALISADE CAPITAL MANAGEMENT, LP | $13.2M | 536K | ▼−5.6% Reduced · −32K sh | Q1 2026 | |
| 14 | RENAISSANCE TECHNOLOGIES LLC | $13.1M | 533K | ▲+8.1% Added · +40K sh | Q1 2026 | |
| 15 | Nuveen, LLC | $12.8M | 522K | ▼−0.5% Reduced · −3K sh | Q1 2026 | |
| 16 | MORGAN STANLEY | $10.5M | 429K | ▲+111% Added · +225K sh | Q1 2026 | |
| 17 | EVENTIDE ASSET MANAGEMENT, LLC | $9.5M | 386K | ▲+27% Added · +81K sh | Q1 2026 | |
| 18 | Connor, Clark & Lunn Investment Management Ltd. | $9.3M | 377K | ▼−2.9% Reduced · −11K sh | Q1 2026 | |
| 19 | MILLENNIUM MANAGEMENT LLC | $8.7M | 353K | ▲+14% Added · +44K sh | Q1 2026 | |
| 20 | GOLDMAN SACHS GROUP INC | $8.4M | 341K | ▲+19% Added · +54K sh | Q1 2026 | |
| 21 | SCHRODER INVESTMENT MANAGEMENT GROUP | $7.0M | 299K | ▼−39% Reduced · −193K sh | Q1 2026 | |
| 22 | WASATCH ADVISORS LP | $6.7M | 279K | ▼−39% Reduced · −176K sh | Q2 2026 | |
| 23 | NORTHERN TRUST CORP | $6.7M | 273K | ▲+4.1% Added · +11K sh | Q1 2026 | |
| 24 | SILVERCREST ASSET MANAGEMENT GROUP LLC | $6.6M | 269K | ▲+31% Added · +64K sh | Q1 2026 | |
| 25 | KORNITZER CAPITAL MANAGEMENT INC /KS | $6.5M | 264K | ▼−1.2% Reduced · −3K 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 14, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer, Director | Option exercise (M) | 550 | $0 |
| Jul 14, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer, Director | Sell (S) | 278 | $6K |
| Jul 14, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer, Director | Sell (S) | 278 | $6K |
| Jul 14, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer, Director | Sell (S) | 278 | $6K |
| Jul 14, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer, Director | Sell (S) | 278 | $6K |
| Jul 14, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer, Director | Sell (S) | 1K | $26K |
| Jul 14, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer, Director | Sell (S) | 1K | $31K |
| Jul 14, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer, Director | Sell (S) | 550 | $13K |
| Jul 14, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer, Director | Option exercise (M) | 550 | $1K |
| Jul 1, 2026 | Oelschlager Kristen M | Chief Operating Officer | Sell (S) | 400 | $10K |
| Jul 1, 2026 | Oelschlager Kristen M | Chief Operating Officer | Sell (S) | 8K | $200K |
| Jul 1, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer, Director | Option exercise (M) | 6K | $0 |
| Company | Co-held by | Combined value |
|---|---|---|
| MICROSOFT CORPMSFT | 55 funds | $26.7B |
| BROADCOM INCAVGO | 55 funds | $15.5B |
| AMAZON.COM INCAMZN | 54 funds | $19.3B |
| META PLATFORMS INC-CLASS AMETA | 54 funds | $12.5B |
| NVIDIA CORPNVDA | 53 funds | $39.2B |
| ALPHABET INC-CL AGOOGL | 53 funds | $17.9B |
| JPMORGAN CHASE & COJPM | 53 funds | $7.7B |
| ELI LILLY & COLLY | 53 funds | $6.7B |
| MICRON TECHNOLOGY INCMU | 53 funds | $6.1B |
| UNITEDHEALTH GROUP INCUNH | 53 funds | $2.5B |
| CENTENE CORPCNC | 53 funds | $540.0M |
| COSTCO WHOLESALE CORPCOST | 52 funds | $4.6B |
Ranked by how many of CSTL's institutional holders also hold each name, a cross-fund conviction signal. Via the MCP server (ticker.co_held).
No filings captured for this ticker in the live stream yet.
13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for CSTL. 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.