The public view is the crawlable proof. The same sourced dataset is available through REST and MCP for agents, research scripts, and back-office tools.
This stock page is the Follow view. The Build view lets your agent query GSM owners, fund changes, insider filings, and source links through REST or MCP.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/stocks/GSM"
Use Arkolith to show who owns GSM, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | DONALD SMITH & CO., INC. | $22.4M | 5.4M | ▲+1.4% Added · +76K sh | Q1 2026 | |
| 2 | First Eagle Investment Management, LLC | $8.6M | 2.1M | ▲+1.0% Added · +20K sh | Q1 2026 | |
| 3 | STATE STREET CORP | $8.6M | 2.1M | ▲+0.6% Added · +13K sh | Q1 2026 | |
| 4 | MASTERS CAPITAL MANAGEMENT LLC | $8.2M | 2.0M | —Held | Q1 2026 | |
| 5 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | $5.8M | 1.4M | ▲+4.5% Added · +61K sh | Q1 2026 | |
| 6 | JACOBS LEVY EQUITY MANAGEMENT, INC | $5.4M | 1.3M | ▲+21% Added · +222K sh | Q1 2026 | |
| 7 | Walleye Capital LLC | $4.9M | 1.2M | ▼−22% Reduced · −337K sh | Q1 2026 | |
| 8 | CenterBook Partners LP | $3.9M | 936K | ▼−37% Reduced · −539K sh | Q1 2026 | |
| 9 | GENDELL JEFFREY L | $3.8M | 912K | ▲+831% Added · +814K sh | Q1 2026 | |
| 10 | CITADEL ADVISORS LLC | $2.9M | 711K | ▼−17% Reduced · −151K sh | Q1 2026 | |
| 11 | VANGUARD PORTFOLIO MANAGEMENT LLC | $2.8M | 687K | ▲New +687K sh | Q1 2026 | |
| 12 | Universal- Beteiligungs- und Servicegesellschaft mbH | $2.8M | 669K | ▲+409% Added · +537K sh | Q1 2026 | |
| 13 | PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO | $649K | 157K | ▲+10% Added · +14K sh | Q1 2026 | |
| 14 | Caption Management, LLC | $520K | 126K | ▼−37% Reduced · −75K sh | Q1 2026 | |
| 15 | Connor, Clark & Lunn Investment Management Ltd. | $436K | 106K | ▲New +106K sh | Q1 2026 | |
| 16 | LOS ANGELES CAPITAL MANAGEMENT LLC | $421K | 102K | ▲+39% Added · +29K sh | Q1 2026 | |
| 17 | Aquatic Capital Management LLC | $330K | 80K | ▲New +80K sh | Q1 2026 | |
| 18 | Cannell & Spears LLC | $309K | 75K | —Held | Q1 2026 | |
| 19 | MetLife Investment Management, LLC | $249K | 60K | ▲+15% Added · +8K sh | Q1 2026 | |
| 20 | VANGUARD FIDUCIARY TRUST CO | $189K | 46K | ▲New +46K sh | Q1 2026 | |
| 21 | INTECH INVESTMENT MANAGEMENT LLC | $185K | 45K | ▼−36% Reduced · −25K sh | Q1 2026 | |
| 22 | Y-Intercept (Hong Kong) Ltd | $124K | 30K | ▲New +30K sh | Q1 2026 | |
| 23 | Vanguard Personalized Indexing Management, LLC | $87K | 21K | ▲+14% Added · +3K sh | Q1 2026 | |
| 24 | &PARTNERS | $84K | 20K | ▼−11% Reduced · −2K sh | Q1 2026 | |
| 25 | Schonfeld Strategic Advisors LLC | $70K | 17K | ▼−81% Reduced · −71K 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 |
|---|---|---|---|---|---|
| Mar 23, 2026 | Lopez Madrid Javier | Executive Chairman, Director | Buy (P) | 26K | $100K |
| Mar 23, 2026 | Villar-Mir de Fuentes Silvia | Director | Buy (P) | 26K | $100K |
| Company | Co-held by | Combined value |
|---|---|---|
| MICROSOFT CORPMSFT | 44 funds | $16.9B |
| AMAZON.COM INCAMZN | 44 funds | $13.4B |
| BROADCOM INCAVGO | 44 funds | $9.5B |
| META PLATFORMS INC-CLASS AMETA | 43 funds | $9.9B |
| ELI LILLY & COLLY | 43 funds | $4.4B |
| MICRON TECHNOLOGY INCMU | 43 funds | $4.3B |
| VISA INC-CLASS A SHARESV | 43 funds | $3.4B |
| COSTCO WHOLESALE CORPCOST | 43 funds | $3.3B |
| ADVANCED MICRO DEVICESAMD | 43 funds | $2.3B |
| UNITEDHEALTH GROUP INCUNH | 43 funds | $2.2B |
| ELEVANCE HEALTH INCELV | 43 funds | $2.1B |
| BANK OF AMERICA CORPBAC | 43 funds | $1.8B |
Ranked by how many of GSM'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 GSM. 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.