295 tracked 13F filers disclose a position in ATMU as of the latest SEC 13F filings, a combined $4.1B 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. | $386.7M | 6.8M | ▲+0.6% Added · +40K sh | Q1 2026 | |
| 2 | FMR LLC | $280.3M | 4.9M | ▲+12% Added · +518K sh | Q1 2026 | |
| 3 | PRICE T ROWE ASSOCIATES INC /MD/ | $254.7M | 4.5M | ▼−4.1% Reduced · −191K sh | Q1 2026 | |
| 4 | VANGUARD PORTFOLIO MANAGEMENT LLC | $209.5M | 3.7M | →First observed position No prior filed position | Q1 2026 | |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | $202.5M | 3.6M | →First observed position No prior filed position | Q1 2026 | |
| 6 | GOLDMAN SACHS GROUP INC | $186.8M | 3.3M | ▲+2.8% Added · +89K sh | Q1 2026 | |
| 7 | STATE STREET CORP | $166.0M | 3.3M | ▲+72% Added · +1.4M sh | Q2 2026 | |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | $146.3M | 2.9M | ▲+8.4% Added · +223K sh | Q2 2026 | |
| 9 | FIRST TRUST ADVISORS LP | $125.1M | 2.2M | ▲+3.3% Added · +71K sh | Q1 2026 | |
| 10 | MORGAN STANLEY | $98.6M | 1.7M | ▼−18% Reduced · −386K sh | Q1 2026 | |
| 11 | Channing Capital Management, LLC | $88.0M | 1.7M | ▲+25% Added · +340K sh | Q2 2026 | |
| 12 | D. E. Shaw & Co., Inc. | $92.0M | 1.6M | ▲+12% Added · +177K sh | Q1 2026 | |
| 13 | T. Rowe Price Investment Management, Inc. | Withheld | 1.6M | ▼−2.6% Reduced · −42K sh | Q1 2026 | |
| 14 | JANUS HENDERSON GROUP PLC | $88.1M | 1.6M | ▲+13% Added · +182K sh | Q1 2026 | |
| 15 | Nuveen, LLC | $82.0M | 1.4M | ▲+10% Added · +134K sh | Q1 2026 | |
| 16 | DIMENSIONAL FUND ADVISORS LP | $74.0M | 1.3M | ▲+3.6% Added · +45K sh | Q1 2026 | |
| 17 | EMINENCE CAPITAL, LP | $72.8M | 1.3M | ▼−66% Reduced · −2.5M sh | Q1 2026 | |
| 18 | WESTWOOD HOLDINGS GROUP INC | $70.3M | 1.2M | ▼−10% Reduced · −142K sh | Q1 2026 | |
| 19 | MANGROVE PARTNERS IM, LLC | $61.8M | 1.2M | ▼−7.9% Reduced · −104K sh | Q2 2026 | |
| 20 | Neuberger Berman Group LLC | $66.7M | 1.2M | ▲217× Added · +1.2M sh | Q1 2026 | |
| 21 | FRONTIER CAPITAL MANAGEMENT CO LLC | $59.0M | 1.2M | ▲+56% Added · +416K sh | Q2 2026 | |
| 22 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | $56.7M | 1000K | ▲+194% Added · +659K sh | Q1 2026 | |
| 23 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $53.4M | 941K | ▲+0.5% Added · +5K sh | Q1 2026 | |
| 24 | Port Capital LLC | $51.6M | 909K | ▲+3.6% Added · +32K sh | Q1 2026 | |
| 25 | BANK OF AMERICA CORP /DE/ | $50.7M | 894K | ▲+34% Added · +226K 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, 1 fund opened a new position in ATMU and 32 added to an existing one, while 24 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 |
|---|---|---|
| JPMORGAN CHASE & COJPM | 161 funds | $52.9B |
| AMAZON.COM INCAMZN | 159 funds | $161.6B |
| MICROSOFT CORPMSFT | 158 funds | $220.7B |
| ALPHABET INC-CL AGOOGL | 158 funds | $136.5B |
| VISA INC-CLASS A SHARESV | 155 funds | $51.7B |
| APPLE INCAAPL | 154 funds | $236.7B |
| META PLATFORMS INC-CLASS AMETA | 154 funds | $90.5B |
| COSTCO WHOLESALE CORPCOST | 153 funds | $29.8B |
| NVIDIA CORPNVDA | 152 funds | $318.7B |
| ELI LILLY & COLLY | 152 funds | $60.7B |
| TESLA INCTSLA | 152 funds | $55.9B |
| MICRON TECHNOLOGY INCMU | 152 funds | $31.9B |
Ranked by how many of ATMU's institutional holders also hold each name, a cross-fund conviction signal.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Aug 17, 2026 | Swan Renee | Chief People Officer | Sell (S) | 4K | $197K |
| Aug 12, 2026 | Macadam Stephen E. | Director | Buy (P) | 2K | $100K |
| Jun 1, 2026 | Disher Stephanie | Chief Executive Officer, Director | Sell (S) | 26K | $1.2M |
| Jun 1, 2026 | Masters Charles | Senior Vice President | Sell (S) | 3K | $131K |
| Jun 1, 2026 | Kienzler Jack | Chief Financial Officer | Sell (S) | 5K | $232K |
| Jun 1, 2026 | Swan Renee | Chief People Officer | Sell (S) | 3K | $116K |
| May 12, 2026 | HAGGERTY GRETCHEN R | Director | Buy (P) | 100 | $6K |
| May 12, 2026 | HAGGERTY GRETCHEN R | Director | Buy (P) | 1 | $56 |
| May 12, 2026 | HAGGERTY GRETCHEN R | Director | Buy (P) | 2K | $104K |
| Nov 13, 2025 | Donoso Diego | Director | Sell (S) | 20 | $977 |
| Sep 5, 2025 | Donoso Diego | Director | Buy (P) | 15 | $687 |
| Aug 13, 2025 | Donoso Diego | Director | Buy (P) | 25 | $1K |
Connected entities for ATMU
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/ATMU/capital-change-brief"
Use Arkolith's capital_change_brief for ATMU. 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 ATMU. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.