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/AMT/capital-change-brief"
Use Arkolith's capital_change_brief for AMT. 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. | $7.8B | 45.0M | ▲+2.1% Added · +919K sh | Q1 2026 | |
| 2 | VANGUARD PORTFOLIO MANAGEMENT LLC | $4.8B | 27.6M | ▲New +27.6M sh | Q1 2026 | |
| 3 | STATE STREET CORP | $3.7B | 21.4M | ▲+2.1% Added · +447K sh | Q1 2026 | |
| 4 | GEODE CAPITAL MANAGEMENT, LLC | $2.4B | 13.9M | ▲+3.2% Added · +435K sh | Q1 2026 | |
| 5 | FMR LLC | $2.0B | 11.3M | ▼−5.8% Reduced · −702K sh | Q1 2026 | |
| 6 | VANGUARD FIDUCIARY TRUST CO | $465.9M | 2.7M | ▲New +2.7M sh | Q1 2026 | |
| 7 | CANTILLON CAPITAL MANAGEMENT LLC | $278.3M | 1.6M | ▼−12% Reduced · −218K sh | Q1 2026 | |
| 8 | Magellan Asset Management Ltd | $259.4M | 1.5M | ▲+40% Added · +432K sh | Q1 2026 | |
| 9 | LORING WOLCOTT & COOLIDGE FIDUCIARY ADVISORS LLP/MA | $218.1M | 1.2M | ▼−5.6% Reduced · −72K sh | Q1 2026 | |
| 10 | Point72 Asset Management, L.P. | $208.0M | 1.2M | ▲15× Added · +1.1M sh | Q1 2026 | |
| 11 | Heard Capital LLC | $191.9M | 1.1M | ▼−4.3% Reduced · −50K sh | Q1 2026 | |
| 12 | CBRE INVESTMENT MANAGEMENT LISTED REAL ASSETS LLC | $191.6M | 1.1M | ▲+41% Added · +321K sh | Q1 2026 | |
| 13 | CITADEL ADVISORS LLC | $151.3M | 877K | ▼−20% Reduced · −223K sh | Q1 2026 | |
| 14 | Man Group plc | $142.6M | 826K | ▼−26% Reduced · −295K sh | Q1 2026 | |
| 15 | STOREBRAND ASSET MANAGEMENT AS | $137.7M | 798K | ▼−2.4% Reduced · −19K sh | Q1 2026 | |
| 16 | VOLORIDGE INVESTMENT MANAGEMENT, LLC | $136.6M | 791K | ▲+40% Added · +225K sh | Q1 2026 | |
| 17 | MILFORD FUNDS LTD | $107.2M | 621K | ▼−5.7% Reduced · −37K sh | Q1 2026 | |
| 18 | AVIVA PLC | $89.1M | 516K | ▲+2.4% Added · +12K sh | Q1 2026 | |
| 19 | Liontrust Investment Partners LLP | $84.6M | 490K | ▼−8.4% Reduced · −45K sh | Q1 2026 | |
| 20 | Ensign Peak Advisors, Inc | $83.7M | 485K | ▼−31% Reduced · −222K sh | Q1 2026 | |
| 21 | Vontobel Holding Ltd. | $82.6M | 479K | ▼−47% Reduced · −418K sh | Q1 2026 | |
| 22 | BLAIR WILLIAM & CO/IL | $81.1M | 470K | ▼−31% Reduced · −208K sh | Q1 2026 | |
| 23 | GREAT LAKES ADVISORS, LLC | $77.6M | 450K | ▲+4.3% Added · +19K sh | Q1 2026 | |
| 24 | Maryland State Retirement & Pension System | $77.0M | 446K | ▼−4.0% Reduced · −19K sh | Q1 2026 | |
| 25 | ANTIPODES PARTNERS Ltd | $75.4M | 437K | ▲+7.3% Added · +30K 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 |
|---|---|---|---|---|---|
| Jun 1, 2026 | Meyer Robert Joseph | SVP & Advisor to the CFO | Tax withholding (F) | 153 | $29K |
| May 28, 2026 | REEVE PAMELA D A | Director | Gift (G) | 810 | $0 |
| Apr 29, 2026 | Dowling Ruth T | EVP, Chief Admin Ofr, GC & Sec | Sell (S) | 416 | $74K |
| Apr 28, 2026 | Dowling Ruth T | EVP, Chief Admin Ofr, GC & Sec | Sell (S) | 556 | $99K |
| Mar 11, 2026 | Vondran Steven O | President and CEO, Director | Tax withholding (F) | 2K | $395K |
| Mar 11, 2026 | Noel Eugene M | EVP & Chief Operating Officer | Tax withholding (F) | 719 | $131K |
| Mar 11, 2026 | Dowling Ruth T | EVP, Chief Admin Ofr, GC & Sec | Tax withholding (F) | 863 | $158K |
| Mar 11, 2026 | Meyer Robert Joseph | SVP & Chief Accounting Officer | Tax withholding (F) | 684 | $125K |
| Mar 11, 2026 | Smith Rodney M | EVP, CFO & Treasurer | Tax withholding (F) | 1K | $237K |
| Mar 11, 2026 | Font Juan | SVP, Pres. & CEO, CoreSite | Tax withholding (F) | 928 | $170K |
| Mar 11, 2026 | Rossi Richard C | EVP & President, U.S. Tower | Tax withholding (F) | 684 | $125K |
| Mar 10, 2026 | Frank Kenneth R | Director | Grant (A) | 1K | $0 |
13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for AMT. 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.