Among active 13F managers last quarter, 5 opened and 33 added, while 21 reduced; the largest holder to move was American Century Companies Inc (−1.5%). No open-market insider trades in the last 180 days.
Funds lean in and no leg opposes.
272 tracked 13F filers disclose a position in ATRO as of the latest SEC 13F filings, a combined $2.0B 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 | Shares | Position value | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 2.8M | $188.5M | ▲+1.0% Added · +27K sh | Q1 2026 | |
| 2 | State Street Corp | 2.1M | $166.7M | ▼−13% Reduced · −299K sh | Q2 2026 | |
| 3 | American Century Companies Inc | 1.7M | $115.9M | ▼−1.5% Reduced · −27K sh | Q1 2026 | |
| 4 | Vanguard Capital Management LLC | 1.4M | $92.7M | →New filer Inherited book · not a new buyer | Q1 2026 | |
| 5 | Geode Capital Management, LLC | 1.0M | $84.6M | ▲+17% Added · +154K sh | Q2 2026 | |
| 6 | Pertento Partners LLP | 994K | $80.7M | ▲+22% Added · +178K sh | Q2 2026 | |
| 7 | Next Century Growth Investors LLC | 743K | $60.4M | ▼−5.5% Reduced · −43K sh | Q2 2026 | |
| 8 | Dimensional Fund Advisors LP | 674K | $45.0M | ▲+5.3% Added · +34K sh | Q1 2026 | |
| 9 | D. E. Shaw & Co., Inc. | 608K | $40.6M | ▲+23% Added · +115K sh | Q1 2026 | |
| 10 | Emerald Advisers, LLC | 514K | $41.8M | ▲+14% Added · +65K sh | Q2 2026 | |
| 11 | Raymond James Financial Inc | 493K | $31.5M | ▲+13% Added · +57K sh | Q1 2026 | |
| 12 | Goldman Sachs Group Inc | 455K | $30.4M | ▲+45% Added · +140K sh | Q1 2026 | |
| 13 | Ameriprise Financial Inc | 451K | $30.1M | ▲+76% Added · +195K sh | Q1 2026 | |
| 14 | Morgan Stanley | 448K | $29.9M | ▼−19% Reduced · −104K sh | Q1 2026 | |
| 15 | Nuveen, LLC | 401K | $26.8M | ▼−0.6% Reduced · −3K sh | Q1 2026 | |
| 16 | Ophir Asset Management Pty Ltd | 386K | $31.3M | ▲New +386K sh | Q2 2026 | |
| 17 | BNP Paribas Financial Markets | 371K | $24.8M | ▼−17% Reduced · −73K sh | Q1 2026 | |
| 18 | Vanguard Portfolio Management LLC | 366K | $24.4M | →New filer Inherited book · not a new buyer | Q1 2026 | |
| 19 | Fisher Asset Management, LLC | 349K | $23.3M | ▲+475% Added · +288K sh | Q1 2026 | |
| 20 | Point72 Asset Management, L.P. | 331K | $26.9M | ▼−42% Reduced · −236K sh | Q2 2026 | |
| 21 | Emerald Mutual Fund Advisers Trust | 327K | $26.6M | ▲+17% Added · +48K sh | Q2 2026 | |
| 22 | Fred Alger Management, LLC | 325K | $21.7M | ▲+121% Added · +178K sh | Q1 2026 | |
| 23 | Private Capital Management, LLC | 323K | $21.5M | ▼−42% Reduced · −233K sh | Q1 2026 | |
| 24 | UBS Group AG | 291K | $19.4M | ▲+3.2% Added · +9K sh | Q1 2026 | |
| 25 | Charles Schwab Investment Management Inc | 289K | $19.3M | ▼−1.4% Reduced · −4K 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, 5 funds opened a new position in ATRO and 33 added to an existing one, while 21 reduced. 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 | Their position there |
|---|---|---|
| Microsoft CorpMSFT | 143 funds | $202.8B |
| Amazon.com IncAMZN | 142 funds | $147.2B |
| Nvidia CorpNVDA | 141 funds | $303.5B |
| Apple IncAAPL | 141 funds | $227.4B |
| Meta Platforms Inc-Class AMETA | 139 funds | $87.0B |
| Broadcom IncAVGO | 136 funds | $120.6B |
| Eli Lilly & CoLLY | 136 funds | $62.9B |
| Alphabet Inc-CL AGOOGL | 135 funds | $120.8B |
| Costco Wholesale CorpCOST | 134 funds | $29.1B |
| Lam Research CorpLRCX | 133 funds | $25.6B |
| Micron Technology IncMU | 132 funds | $29.8B |
| JPMorgan Chase & CoJPM | 131 funds | $47.8B |
Ranked by how many of ATRO's tracked holders also hold each name. The last column is those co-holders' combined reported position in that name, not in ATRO.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Dec 1, 2025 | Mulato James | Insider | Sell (S) | 10K | $518K |
| Sep 5, 2025 | Mulato James | Insider | Sell (S) 2 lots, same day | 1K | $43K |
| May 9, 2025 | Keane Robert S | Director | Sell (S) | 38K | $999K |
| May 8, 2025 | Keane Robert S | Director | Sell (S) | 200K | $5.4M |
| Mar 7, 2025 | Keane Robert S | Director | Sell (S) 2 lots, same day | 77K | $1.9M |
| Dec 23, 2024 | Peabody Mark | Executive VP & Pres-Aerospace | Sell (S) | 511 | $8K |
| Mar 14, 2024 | Kuehn Michael C | Executive Vice President | Sell (S) | 7K | $125K |
| Mar 4, 2024 | Keane Robert S | Director | Sell (S) 2 lots, same day | 3K | $56K |
| Mar 1, 2024 | Keane Robert S | Director | Sell (S) | 33K | $622K |
| Feb 29, 2024 | Kuehn Michael C | Executive Vice President | Sell (S) | 2K | $45K |
| Jun 6, 2023 | Keane Robert S | Director | Sell (S) | 7K | $111K |
| Sep 15, 2022 | Johnson Warren C | Director | Buy (P) | 6K | $49K |
One row per insider, day and transaction code; shares and value are summed across the lots. Every lot is on the full insider page and in the filing.
Where institutional funds (13F), corporate insiders (Form 4) and US House members (STOCK Act) are buying or selling the same name in the same window. Green is buying, red is selling.
Insiders and Congress: last 180 days. Funds: latest 13F, top 100 holders incl. passive
| Source | Buying | Selling | Net |
|---|---|---|---|
13F funds Top 100 holders by value, passive included; the hero counts active managers only | 51 | 36 | – |
Insiders Form 4 open-market | 0 | 0 | $0 |
US House STOCK Act trades | 0 | 0 | $0 |
Capital Rotation reports where institutional capital disclosed rotating, as of the latest public SEC 13F filings. It is data, not investment advice, a recommendation, or a prediction. Filings lag about 45 days and cover long US equity positions only. Past disclosed flows do not indicate future prices. Do your own research; consult a licensed advisor.
| Class | 13F holders | Value held |
|---|---|---|
| ATROthis pagecs | 272 funds | $2.0B |
| ATROBCommon Stock | 14 funds | $32.1M |
| ATRO 5.5 03/15/30NOTE 5.500% 3/1 | 4 funds | $136.9M |
Same issuer, multiple share classes. The consensus leaderboards count this company once across all classes; this is the per-class detail.
Connected entities for ATRO
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/ATRO/capital-change-brief"
Use Arkolith's capital_change_brief for ATRO. 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 ATRO. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.