287 tracked 13F filers disclose a position in ATKR as of the latest SEC 13F filings, a combined $1.9B 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. | $154.7M | 2.6M | ▲+2.8% Added · +71K sh | Q1 2026 | |
| 2 | VANGUARD PORTFOLIO MANAGEMENT LLC | $123.1M | 2.1M | →First observed position No prior filed position | Q1 2026 | |
| 3 | Gates Capital Management, Inc. | $130.0M | 1.7M | ▼−36% Reduced · −976K sh | Q2 2026 | |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | $89.3M | 1.5M | →First observed position No prior filed position | Q1 2026 | |
| 5 | AMERICAN CENTURY COMPANIES INC | $84.8M | 1.4M | ▲+15% Added · +186K sh | Q1 2026 | |
| 6 | DIMENSIONAL FUND ADVISORS LP | $72.3M | 1.2M | ▲+8.6% Added · +98K sh | Q1 2026 | |
| 7 | FIRST TRUST ADVISORS LP | $72.3M | 1.2M | ▼−11% Reduced · −159K sh | Q1 2026 | |
| 8 | Coliseum Capital Management, LLC | $55.8M | 947K | ▲+17% Added · +138K sh | Q1 2026 | |
| 9 | STATE STREET CORP | $68.9M | 906K | ▲+8.5% Added · +71K sh | Q2 2026 | |
| 10 | GEODE CAPITAL MANAGEMENT, LLC | $68.6M | 902K | ▲+5.6% Added · +48K sh | Q2 2026 | |
| 11 | EARNEST PARTNERS LLC | $58.7M | 772K | ▼−0.7% Reduced · −6K sh | Q2 2026 | |
| 12 | Hill City Capital, LP | $55.1M | 724K | ▼−0.6% Reduced · −4K sh | Q2 2026 | |
| 13 | HARDING LOEVNER LP | $41.5M | 705K | ▼−3.8% Reduced · −28K sh | Q1 2026 | |
| 14 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | $41.1M | 698K | ▼−0.9% Reduced · −7K sh | Q1 2026 | |
| 15 | MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $31.4M | 533K | ▲+52% Added · +182K sh | Q1 2026 | |
| 16 | Irenic Capital Management LP | $38.6M | 508K | ▲36× Added · +494K sh | Q2 2026 | |
| 17 | BANK OF AMERICA CORP /DE/ | $27.2M | 462K | ▲+10% Added · +43K sh | Q1 2026 | |
| 18 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $24.6M | 418K | ▲+1.6% Added · +7K sh | Q1 2026 | |
| 19 | GENDELL JEFFREY L | $23.6M | 400K | ▲+3.4% Added · +13K sh | Q1 2026 | |
| 20 | VICTORY CAPITAL MANAGEMENT INC | $22.3M | 379K | ▼−23% Reduced · −113K sh | Q1 2026 | |
| 21 | LONDON CO OF VIRGINIA | $22.2M | 378K | ▼−8.3% Reduced · −34K sh | Q1 2026 | |
| 22 | OSLO PENSJONSFORSIKRING AS | $28.7M | 377K | —Held | Q2 2026 | |
| 23 | TWO SIGMA INVESTMENTS, LP | $20.8M | 353K | ▲+61% Added · +134K sh | Q1 2026 | |
| 24 | NEW YORK STATE COMMON RETIREMENT FUND | $20.2M | 344K | ▼−0.7% Reduced · −2K sh | Q1 2026 | |
| 25 | JACOBS LEVY EQUITY MANAGEMENT, INC | $20.2M | 343K | ▲+6.0% Added · +20K 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 ATKR and 28 added to an existing one, while 21 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 | 149 funds | $222.8B |
| BERKSHIRE HATHAWAY INC-CL BBRK/B | 142 funds | $30.6B |
| NVIDIA CORPNVDA | 141 funds | $324.9B |
| APPLE INCAAPL | 141 funds | $247.0B |
| ALPHABET INC-CL AGOOGL | 140 funds | $130.4B |
| META PLATFORMS INC-CLASS AMETA | 140 funds | $91.2B |
| BANK OF AMERICA CORPBAC | 140 funds | $26.7B |
| AMAZON.COM INCAMZN | 139 funds | $165.2B |
| CHEVRON CORPCVX | 139 funds | $24.5B |
| ELI LILLY & COLLY | 138 funds | $65.3B |
| JPMORGAN CHASE & COJPM | 136 funds | $47.1B |
| COSTCO WHOLESALE CORPCOST | 135 funds | $29.6B |
Ranked by how many of ATKR's institutional holders also hold each name, a cross-fund conviction signal.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Aug 10, 2026 | Lamps Mark F. | Pres. Safety & Infrastructure | Sell (S) | 300 | $28K |
| May 8, 2026 | James Wilbert W Jr | Director | Sell (S) | 3K | $243K |
| May 8, 2026 | Kershaw Justin A | Director | Sell (S) | 3K | $206K |
| Feb 17, 2026 | Lamps Mark F. | Pres. Safety & Infrastructure | Sell (S) | 1K | $66K |
| Nov 17, 2025 | Lamps Mark F. | Pres. Safety & Infrastructure | Sell (S) | 1K | $65K |
| Aug 15, 2025 | Lamps Mark F. | Pres. Safety & Infrastructure | Sell (S) | 1K | $59K |
| May 9, 2025 | Lamps Mark F. | Pres. Safety & Infrastructure | Sell (S) | 1K | $69K |
| Feb 10, 2025 | Lamps Mark F. | Pres. Safety & Infrastructure | Sell (S) | 500 | $33K |
| Dec 3, 2024 | Isbell Jeri L | Director | Sell (S) | 3K | $315K |
| Nov 27, 2024 | Waltz William E Jr. | President and CEO, Director | Sell (S) | 59K | $5.5M |
| Nov 26, 2024 | Waltz William E Jr. | President and CEO, Director | Sell (S) | 61K | $5.8M |
| Nov 26, 2024 | Kelly Daniel S | VP, General Counsel and Sec. | Sell (S) | 13K | $1.3M |
Connected entities for ATKR
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/ATKR/capital-change-brief"
Use Arkolith's capital_change_brief for ATKR. 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 ATKR. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.