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 MCS 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/MCS"
Use Arkolith to show who owns MCS, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | $37.5M | 2.2M | ▲+0.4% Added · +9K sh | Q1 2026 | |
| 2 | Orbis Allan Gray Ltd | $33.7M | 2.0M | ▲+2.4% Added · +47K sh | Q1 2026 | |
| 3 | DIMENSIONAL FUND ADVISORS LP | $24.9M | 1.5M | ▼−1.2% Reduced · −18K sh | Q1 2026 | |
| 4 | VANGUARD GROUP INC | $21.6M | 1.4M | ▼−0.4% Reduced · −5K sh | Q4 2025 | |
| 5 | AMERICAN CENTURY COMPANIES INC | $17.8M | 1.0M | ▲+10% Added · +96K sh | Q1 2026 | |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | $17.0M | 991K | ▲New +991K sh | Q1 2026 | |
| 7 | GAMCO INVESTORS, INC. ET AL | $15.7M | 913K | ▼−0.4% Reduced · −3K sh | Q1 2026 | |
| 8 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | $9.8M | 571K | ▼−5.7% Reduced · −35K sh | Q1 2026 | |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | $9.8M | 568K | ▲+5.0% Added · +27K sh | Q1 2026 | |
| 10 | STATE STREET CORP | $8.9M | 517K | ▲+3.7% Added · +19K sh | Q1 2026 | |
| 11 | GOLDMAN SACHS GROUP INC | $8.3M | 481K | ▲+196% Added · +318K sh | Q1 2026 | |
| 12 | D. E. Shaw & Co., Inc. | $5.5M | 321K | ▼−6.5% Reduced · −22K sh | Q1 2026 | |
| 13 | RENAISSANCE TECHNOLOGIES LLC | $5.4M | 313K | ▼−25% Reduced · −102K sh | Q1 2026 | |
| 14 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | $5.1M | 296K | ▲+1.7% Added · +5K sh | Q1 2026 | |
| 15 | Bank of New York Mellon Corp | $4.7M | 276K | ▼−7.2% Reduced · −21K sh | Q1 2026 | |
| 16 | BARCLAYS PLC | $4.7M | 272K | ▼−12% Reduced · −36K sh | Q1 2026 | |
| 17 | HEARTLAND ADVISORS INC | $4.4M | 255K | ▲+24% Added · +50K sh | Q1 2026 | |
| 18 | VANGUARD PORTFOLIO MANAGEMENT LLC | $4.1M | 240K | ▲New +240K sh | Q1 2026 | |
| 19 | NORTHERN TRUST CORP | $4.1M | 238K | ▲+3.6% Added · +8K sh | Q1 2026 | |
| 20 | MARSHALL WACE, LLP | $4.0M | 236K | ▼−24% Reduced · −76K sh | Q1 2026 | |
| 21 | RAYMOND JAMES FINANCIAL INC | $3.8M | 219K | ▲+6.4% Added · +13K sh | Q1 2026 | |
| 22 | Mesirow Financial Investment Management, Inc. | $3.7M | 213K | ▲+4.4% Added · +9K sh | Q1 2026 | |
| 23 | GABELLI FUNDS LLC | $3.6M | 210K | —Held | Q1 2026 | |
| 24 | AQR CAPITAL MANAGEMENT LLC | $3.6M | 210K | ▲+53% Added · +73K sh | Q1 2026 | |
| 25 | CITADEL ADVISORS LLC | $3.3M | 191K | ▼−18% Reduced · −43K 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 20, 2026 | Evans Michael Reade | Pres., Marcus Hotels & Resorts | Sell (S) | 37 | $597 |
| Mar 6, 2026 | KISSINGER THOMAS F | Sr Exec VP, Gen Counsel & Secy, Director | Sell (S) | 25K | $433K |
| Mar 2, 2026 | Marcus Gregory S | President and CEO, Director | Buy (P) | 34K | $0 |
| Mar 2, 2026 | GERSHOWITZ DIANE M | Director, 10% Owner | Buy (P) | 34K | $0 |
| Mar 2, 2026 | GERSHOWITZ DIANE M | Director, 10% Owner | Gift (G) | 36K | $0 |
| Mar 2, 2026 | Marcus Gregory S | President and CEO, Director | Sell (S) | 34K | $0 |
| Mar 2, 2026 | GERSHOWITZ DIANE M | Director, 10% Owner | Sell (S) | 34K | $0 |
| Feb 23, 2026 | Marcus Gregory S | President and CEO, Director | Tax withholding (F) | 8K | $0 |
| Feb 23, 2026 | KISSINGER THOMAS F | Sr Exec VP, Gen Counsel & Secy, Director | Tax withholding (F) | 2K | $0 |
| Feb 23, 2026 | Paris Chad M | Chief Financial Officer | Tax withholding (F) | 1K | $0 |
| Feb 23, 2026 | Evans Michael Reade | Pres., Marcus Hotels & Resorts | Tax withholding (F) | 2K | $0 |
| Feb 22, 2026 | Marcus Gregory S | President and CEO, Director | Tax withholding (F) | 20K | $0 |
| Company | Co-held by | Combined value |
|---|---|---|
| NVIDIA CORPNVDA | 35 funds | $19.4B |
| MICROSOFT CORPMSFT | 35 funds | $12.3B |
| ALPHABET INC-CL AGOOGL | 35 funds | $9.2B |
| UNITEDHEALTH GROUP INCUNH | 35 funds | $1.3B |
| AMAZON.COM INCAMZN | 34 funds | $9.7B |
| VISA INC-CLASS A SHARESV | 34 funds | $2.4B |
| CHEVRON CORPCVX | 34 funds | $2.0B |
| APPLE INCAAPL | 33 funds | $15.3B |
| BROADCOM INCAVGO | 33 funds | $7.7B |
| META PLATFORMS INC-CLASS AMETA | 33 funds | $6.3B |
| ALPHABET INC-CL CGOOG | 33 funds | $5.5B |
| JPMORGAN CHASE & COJPM | 33 funds | $4.6B |
Ranked by how many of MCS'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 MCS. 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.