249 tracked 13F filers disclose a position in AMSC as of the latest SEC 13F filings, a combined $1.1B in reported value. 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.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | $134.8M | 4.0M | ▲+6.2% Added · +232K sh | Q1 2026 | |
| 2 | VANGUARD CAPITAL MANAGEMENT LLC | $69.0M | 2.0M | →First observed position No prior filed position | Q1 2026 | |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | $57.9M | 1.7M | →First observed position No prior filed position | Q1 2026 | |
| 4 | BAILLIE GIFFORD & CO | $49.0M | 1.4M | ▼−3.9% Reduced · −59K sh | Q1 2026 | |
| 5 | STATE STREET CORP | $56.4M | 1.4M | ▲+7.7% Added · +97K sh | Q2 2026 | |
| 6 | GEODE CAPITAL MANAGEMENT, LLC | $51.6M | 1.2M | ▲+6.3% Added · +74K sh | Q2 2026 | |
| 7 | BARROW HANLEY MEWHINNEY & STRAUSS LLC | $38.6M | 1.1M | ▲New +1.1M sh | Q1 2026 | |
| 8 | Nuveen, LLC | $34.6M | 1.0M | ▲+6.2% Added · +60K sh | Q1 2026 | |
| 9 | OBERWEIS ASSET MANAGEMENT INC/ | $28.8M | 850K | ▲+1.7% Added · +14K sh | Q1 2026 | |
| 10 | EMERALD ADVISERS, LLC | $35.0M | 844K | ▲+11% Added · +87K sh | Q2 2026 | |
| 11 | AWM Investment Company, Inc. | $27.1M | 802K | ▲+6.3% Added · +47K sh | Q1 2026 | |
| 12 | FIRST TRUST ADVISORS LP | $26.3M | 778K | ▲+14% Added · +95K sh | Q1 2026 | |
| 13 | GOLDMAN SACHS GROUP INC | $24.0M | 710K | ▼−9.3% Reduced · −73K sh | Q1 2026 | |
| 14 | DIMENSIONAL FUND ADVISORS LP | $22.3M | 658K | ▲+22% Added · +118K sh | Q1 2026 | |
| 15 | MORGAN STANLEY | $21.5M | 634K | ▼−10% Reduced · −72K sh | Q1 2026 | |
| 16 | UBS Group AG | $20.3M | 600K | ▼−19% Reduced · −145K sh | Q1 2026 | |
| 17 | D. E. Shaw & Co., Inc. | $19.2M | 568K | ▲+28% Added · +124K sh | Q1 2026 | |
| 18 | EMERALD MUTUAL FUND ADVISERS TRUST | $22.4M | 539K | ▲+23% Added · +100K sh | Q2 2026 | |
| 19 | Legal & General Group Plc | $17.9M | 530K | ▲+91% Added · +252K sh | Q1 2026 | |
| 20 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | $15.1M | 447K | ▼−35% Reduced · −236K sh | Q1 2026 | |
| 21 | BNP PARIBAS FINANCIAL MARKETS | $14.8M | 437K | ▲+429% Added · +354K sh | Q1 2026 | |
| 22 | Ranger Investment Management, L.P. | $16.8M | 405K | ▲New +405K sh | Q2 2026 | |
| 23 | Stephens Investment Management Group LLC | $16.7M | 403K | ▲+31% Added · +94K sh | Q2 2026 | |
| 24 | NORTHERN TRUST CORP | $13.3M | 393K | ▲+9.0% Added · +32K sh | Q1 2026 | |
| 25 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $13.0M | 385K | ▼−0.5% Reduced · −2K 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.
Last quarter, 9 funds opened a new position in AMSC and 26 added to an existing one, while 16 reduced and 0 exited entirely — based on 13F filings from active, signal-eligible managers (passive index funds and other mechanical holders are excluded from this count).
| Company | Co-held by | Combined value |
|---|---|---|
| MICROSOFT CORPMSFT | 124 funds | $202.0B |
| AMAZON.COM INCAMZN | 124 funds | $156.5B |
| NVIDIA CORPNVDA | 121 funds | $299.3B |
| APPLE INCAAPL | 120 funds | $221.8B |
| JPMORGAN CHASE & COJPM | 118 funds | $45.3B |
| ALPHABET INC-CL AGOOGL | 117 funds | $116.2B |
| COSTCO WHOLESALE CORPCOST | 117 funds | $26.4B |
| ELI LILLY & COLLY | 116 funds | $59.5B |
| ALPHABET INC-CL CGOOG | 115 funds | $99.4B |
| BROADCOM INCAVGO | 114 funds | $121.1B |
| META PLATFORMS INC-CLASS AMETA | 114 funds | $84.8B |
| VISA INC-CLASS A SHARESV | 113 funds | $45.0B |
Ranked by how many of AMSC's institutional holders also hold each name, a cross-fund conviction signal.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Jun 11, 2026 | McGahn Daniel P | Chairman, President and CEO, Director | Sell (S) | 12K | $429K |
| Jun 11, 2026 | McGahn Daniel P | Chairman, President and CEO, Director | Sell (S) | 5K | $174K |
| Jun 11, 2026 | Kosiba John W JR | SVP, CFO & Treasurer | Sell (S) | 5K | $188K |
| Jun 11, 2026 | Kosiba John W JR | SVP, CFO & Treasurer | Sell (S) | 2K | $66K |
| Jun 11, 2026 | Dambier Laura A. | Director | Sell (S) | 4K | $151K |
| Jun 8, 2026 | Kosiba John W JR | SVP, CFO & Treasurer | Sell (S) | 3K | $136K |
| Jun 8, 2026 | Kosiba John W JR | SVP, CFO & Treasurer | Sell (S) | 2K | $66K |
| Jun 8, 2026 | McGahn Daniel P | Chairman, President and CEO, Director | Sell (S) | 5K | $207K |
| Jun 8, 2026 | McGahn Daniel P | Chairman, President and CEO, Director | Sell (S) | 5K | $197K |
| Jun 3, 2026 | McGahn Daniel P | Chairman, President and CEO, Director | Sell (S) | 7K | $342K |
| Jun 3, 2026 | McGahn Daniel P | Chairman, President and CEO, Director | Sell (S) | 5K | $222K |
| Jun 3, 2026 | McGahn Daniel P | Chairman, President and CEO, Director | Sell (S) | 500 | $25K |
Connected entities for AMSC
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/AMSC/capital-change-brief"
Use Arkolith's capital_change_brief for AMSC. 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 AMSC. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.