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/MAT/capital-change-brief"
Use Arkolith's capital_change_brief for MAT. Tell me what changed, whether insider activity corroborates it, and cite the SEC evidence.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | EdgePoint Investment Group Inc. | $714.0M | 49.1M | ▲+3.8% Added · +1.8M sh | Q1 2026 | |
| 2 | PRIMECAP MANAGEMENT CO/CA/ | $431.5M | 29.7M | ▼−0.3% Reduced · −106K sh | Q1 2026 | |
| 3 | BlackRock, Inc. | $397.0M | 27.3M | ▲+1.8% Added · +477K sh | Q1 2026 | |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | $198.4M | 13.7M | ▲New +13.7M sh | Q1 2026 | |
| 5 | VANGUARD PORTFOLIO MANAGEMENT LLC | $198.0M | 13.6M | ▲New +13.6M sh | Q1 2026 | |
| 6 | ARIEL INVESTMENTS, LLC | $197.1M | 13.6M | ▲+8.3% Added · +1.0M sh | Q1 2026 | |
| 7 | SOUTHEASTERN ASSET MANAGEMENT INC/TN/ | $186.2M | 12.8M | ▲+49% Added · +4.2M sh | Q1 2026 | |
| 8 | DIMENSIONAL FUND ADVISORS LP | $160.6M | 11.1M | ▲+7.6% Added · +783K sh | Q1 2026 | |
| 9 | STATE STREET CORP | $141.2M | 9.7M | ▲+1.1% Added · +109K sh | Q1 2026 | |
| 10 | GEODE CAPITAL MANAGEMENT, LLC | $89.7M | 6.2M | ▲+3.0% Added · +183K sh | Q1 2026 | |
| 11 | PRICE T ROWE ASSOCIATES INC /MD/ | $88.5M | 6.1M | ▼−6.7% Reduced · −436K sh | Q1 2026 | |
| 12 | AQR CAPITAL MANAGEMENT LLC | $66.6M | 4.6M | ▲+13% Added · +518K sh | Q1 2026 | |
| 13 | Alyeska Investment Group, L.P. | $67.0M | 4.6M | ▲+34% Added · +1.2M sh | Q1 2026 | |
| 14 | D. E. Shaw & Co., Inc. | $56.4M | 3.9M | ▲+64% Added · +1.5M sh | Q1 2026 | |
| 15 | MARSHALL WACE, LLP | $54.1M | 3.7M | ▲274× Added · +3.7M sh | Q1 2026 | |
| 16 | MORGAN STANLEY | $51.5M | 3.5M | ▼−34% Reduced · −1.8M sh | Q1 2026 | |
| 17 | GOLDMAN SACHS GROUP INC | $51.5M | 3.5M | ▲+38% Added · +971K sh | Q1 2026 | |
| 18 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $49.0M | 3.4M | ▲+3.6% Added · +116K sh | Q1 2026 | |
| 19 | MILLENNIUM MANAGEMENT LLC | $40.7M | 2.8M | ▲+25% Added · +567K sh | Q1 2026 | |
| 20 | NORTHERN TRUST CORP | $40.6M | 2.8M | ▲+1.8% Added · +50K sh | Q1 2026 | |
| 21 | VICTORY CAPITAL MANAGEMENT INC | $37.6M | 2.6M | ▲+35% Added · +668K sh | Q1 2026 | |
| 22 | NORGES BANK | $49.2M | 2.5M | ▼−12% Reduced · −343K sh | Q4 2025 | |
| 23 | Squarepoint Ops LLC | $34.4M | 2.4M | ▼−35% Reduced · −1.3M sh | Q1 2026 | |
| 24 | UBS Group AG | $33.5M | 2.3M | ▲+35% Added · +592K sh | Q1 2026 | |
| 25 | Point72 Asset Management, L.P. | $32.3M | 2.2M | ▼−49% Reduced · −2.1M 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 |
|---|---|---|---|---|---|
| May 29, 2026 | Ancira Karen | EVP, Chief People Officer | Option exercise (M) | 17K | — |
| May 29, 2026 | Ancira Karen | EVP, Chief People Officer | Tax withholding (F) | 6K | $90K |
| May 29, 2026 | Ancira Karen | EVP, Chief People Officer | Option exercise (M) | 17K | $0 |
| May 29, 2026 | Ruh Paul | Chief Financial Officer | Option exercise (M) | 25K | — |
| May 29, 2026 | Ruh Paul | Chief Financial Officer | Tax withholding (F) | 9K | $130K |
| May 29, 2026 | Ruh Paul | Chief Financial Officer | Option exercise (M) | 66K | — |
| May 29, 2026 | Ruh Paul | Chief Financial Officer | Tax withholding (F) | 31K | $469K |
| May 29, 2026 | Ruh Paul | Chief Financial Officer | Option exercise (M) | 25K | $0 |
| May 29, 2026 | Ruh Paul | Chief Financial Officer | Option exercise (M) | 66K | $0 |
| May 28, 2026 | Hertz Noreena | Director | Grant (A) | 12K | $0 |
| May 28, 2026 | FERGUSON DIANA SUE | Director | Grant (A) | 12K | $0 |
| May 28, 2026 | Cisneros Adriana | Director | Grant (A) | 12K | $0 |
| Company | Co-held by | Combined value |
|---|---|---|
| MICROSOFT CORPMSFT | 155 funds | $60.6B |
| AMAZON.COM INCAMZN | 154 funds | $49.4B |
| ALPHABET INC-CL AGOOGL | 154 funds | $40.3B |
| CITIGROUP INCC | 154 funds | $6.3B |
| NVIDIA CORPNVDA | 152 funds | $87.5B |
| META PLATFORMS INC-CLASS AMETA | 152 funds | $28.4B |
| BROADCOM INCAVGO | 151 funds | $31.5B |
| ELI LILLY & COLLY | 151 funds | $16.1B |
| GENERAL MOTORS COGM | 151 funds | $3.6B |
| TESLA INCTSLA | 150 funds | $18.7B |
| COSTCO WHOLESALE CORPCOST | 150 funds | $9.9B |
| NETFLIX INCNFLX | 150 funds | $7.9B |
Ranked by how many of MAT'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 MAT. 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.