| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | $106.2M | 5.4M | ▼−0.7% Reduced · −41K sh | Q1 2026 | |
| 2 | DIMENSIONAL FUND ADVISORS LP | $39.7M | 2.0M | ▲+13% Added · +228K sh | Q1 2026 | |
| 3 | STATE STREET CORP | $31.5M | 1.6M | ▲+4.9% Added · +76K sh | Q1 2026 | |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | $30.2M | 1.5M | ▲New +1.5M sh | Q1 2026 | |
| 5 | TD ASSET MANAGEMENT INC | $30.2M | 1.5M | ▼−21% Reduced · −422K sh | Q1 2026 | |
| 6 | FULLER & THALER ASSET MANAGEMENT, INC. | $27.3M | 1.4M | ▲~0% Added · +676 sh | Q1 2026 | |
| 7 | MARSHALL WACE, LLP | $20.1M | 1.0M | ▼−17% Reduced · −212K sh | Q1 2026 | |
| 8 | AMERICAN CENTURY COMPANIES INC | $19.9M | 1.0M | ▲+53% Added · +352K sh | Q1 2026 | |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | $19.1M | 977K | ▲+10% Added · +90K sh | Q1 2026 | |
| 10 | Boston Trust Walden Corp | $18.5M | 945K | ▼−13% Reduced · −142K sh | Q1 2026 | |
| 11 | Epoch Investment Partners, Inc. | $17.6M | 899K | ▼−20% Reduced · −228K sh | Q1 2026 | |
| 12 | VANGUARD PORTFOLIO MANAGEMENT LLC | $15.4M | 788K | ▲New +788K sh | Q1 2026 | |
| 13 | D. E. Shaw & Co., Inc. | $13.0M | 666K | ▲+19% Added · +108K sh | Q1 2026 | |
| 14 | RENAISSANCE TECHNOLOGIES LLC | $10.9M | 554K | ▲+1.7% Added · +9K sh | Q1 2026 | |
| 15 | SYSTEMATIC FINANCIAL MANAGEMENT LP | $8.9M | 453K | ▲+4.0% Added · +17K sh | Q1 2026 | |
| 16 | MORGAN STANLEY | $8.2M | 420K | ▼−29% Reduced · −171K sh | Q1 2026 | |
| 17 | UBS Group AG | $8.2M | 420K | ▲+64% Added · +164K sh | Q1 2026 | |
| 18 | NORTHERN TRUST CORP | $7.3M | 372K | ▲+0.2% Added · +888 sh | Q1 2026 | |
| 19 | MILLENNIUM MANAGEMENT LLC | $7.3M | 371K | ▲+28% Added · +81K sh | Q1 2026 | |
| 20 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | $6.5M | 330K | ▲+2.1% Added · +7K sh | Q1 2026 | |
| 21 | GOLDMAN SACHS GROUP INC | $6.5M | 329K | ▼−41% Reduced · −227K sh | Q1 2026 | |
| 22 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | $6.4M | 325K | ▼−42% Reduced · −234K sh | Q1 2026 | |
| 23 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $6.3M | 321K | ▼−8.4% Reduced · −30K sh | Q1 2026 | |
| 24 | VICTORY CAPITAL MANAGEMENT INC | $4.9M | 250K | ▼−18% Reduced · −56K sh | Q1 2026 | |
| 25 | Bank of New York Mellon Corp | $4.8M | 243K | ▼−6.1% Reduced · −16K 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.
| Company | Co-held by | Combined value |
|---|---|---|
| MICROSOFT CORPMSFT | 68 funds | $29.5B |
| APPLE INCAAPL | 66 funds | $35.7B |
| JPMORGAN CHASE & COJPM | 66 funds | $9.4B |
| AMAZON.COM INCAMZN | 65 funds | $20.8B |
| ALPHABET INC-CL AGOOGL | 65 funds | $20.6B |
| ELI LILLY & COLLY | 65 funds | $7.4B |
| BERKSHIRE HATHAWAY INC-CL BBRK/B | 65 funds | $6.3B |
| VISA INC-CLASS A SHARESV | 64 funds | $5.8B |
| COSTCO WHOLESALE CORPCOST | 64 funds | $5.3B |
| LAM RESEARCH CORPLRCX | 64 funds | $3.8B |
| UNITEDHEALTH GROUP INCUNH | 64 funds | $3.1B |
| RTX CORPRTX | 64 funds | $2.8B |
Ranked by how many of AMPH's institutional holders also hold each name, a cross-fund conviction signal.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Dec 17, 2025 | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | Sell (S) | 10K | $256K |
| Dec 12, 2025 | Petersen Floyd F. | Director | Sell (S) | 2K | $63K |
| Dec 11, 2025 | Petersen Floyd F. | Director | Sell (S) | 2K | $45K |
| Nov 25, 2025 | PRINS RICHARD K | Director | Sell (S) | 4K | $113K |
| Nov 13, 2025 | Petersen Floyd F. | Director | Sell (S) | 17K | $442K |
| Nov 3, 2025 | Petersen Floyd F. | Director | Sell (S) | 500 | $13K |
| Oct 1, 2025 | Petersen Floyd F. | Director | Sell (S) | 500 | $14K |
| Sep 2, 2025 | Petersen Floyd F. | Director | Sell (S) | 500 | $15K |
| Aug 1, 2025 | Petersen Floyd F. | Director | Sell (S) | 500 | $10K |
| Jul 2, 2025 | Petersen Floyd F. | Director | Sell (S) | 500 | $12K |
| Jun 2, 2025 | Petersen Floyd F. | Director | Sell (S) | 500 | $13K |
| May 1, 2025 | Petersen Floyd F. | Director | Sell (S) | 500 | $12K |
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/AMPH/capital-change-brief"
Use Arkolith's capital_change_brief for AMPH. Tell me what changed, whether insider activity corroborates it, and cite the SEC evidence.
13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for AMPH. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.