214 tracked 13F filers disclose a position in ATRC as of the latest SEC 13F filings, a combined $1.3B 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. | $115.3M | 4.0M | ▼−0.6% Reduced · −23K sh | Q1 2026 | |
| 2 | ALLIANCEBERNSTEIN L.P. | $128.9M | 3.3M | ▼−8.6% Reduced · −305K sh | Q1 2026 | |
| 3 | Hood River Capital Management LLC | $81.3M | 2.9M | ▼−6.8% Reduced · −212K sh | Q2 2026 | |
| 4 | VANGUARD PORTFOLIO MANAGEMENT LLC | $77.1M | 2.7M | →First observed position No prior filed position | Q1 2026 | |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | $61.5M | 2.2M | →First observed position No prior filed position | Q1 2026 | |
| 6 | GOLDMAN SACHS GROUP INC | $47.6M | 1.7M | ▲+88% Added · +782K sh | Q1 2026 | |
| 7 | MARSHALL WACE, LLP | $41.9M | 1.5M | ▲+61% Added · +554K sh | Q1 2026 | |
| 8 | STATE STREET CORP | $38.9M | 1.4M | ▲+6.7% Added · +88K sh | Q2 2026 | |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | $36.9M | 1.3M | ▲+7.6% Added · +94K sh | Q2 2026 | |
| 10 | Divisadero Street Capital Management, LP | $33.1M | 1.2M | ▲New +1.2M sh | Q1 2026 | |
| 11 | BNP Paribas Asset Management Holding S.A. | $30.3M | 1.1M | ▲+11% Added · +102K sh | Q1 2026 | |
| 12 | Neuberger Berman Group LLC | $30.0M | 1.1M | ▼−3.3% Reduced · −36K sh | Q1 2026 | |
| 13 | DIMENSIONAL FUND ADVISORS LP | $28.5M | 998K | ▲+8.2% Added · +76K sh | Q1 2026 | |
| 14 | Champlain Investment Partners, LLC | $26.3M | 939K | ▼−3.4% Reduced · −33K sh | Q2 2026 | |
| 15 | KENNEDY CAPITAL MANAGEMENT LLC | $23.8M | 834K | ▼−0.4% Reduced · −3K sh | Q1 2026 | |
| 16 | BANK OF AMERICA CORP /DE/ | $21.9M | 769K | ▲+14% Added · +93K sh | Q1 2026 | |
| 17 | TWO SIGMA INVESTMENTS, LP | $21.4M | 751K | ▲+97% Added · +371K sh | Q1 2026 | |
| 18 | First Light Asset Management, LLC | $20.8M | 730K | ▼−38% Reduced · −446K sh | Q1 2026 | |
| 19 | VOYA INVESTMENT MANAGEMENT LLC | $20.5M | 720K | ▲+1.0% Added · +7K sh | Q1 2026 | |
| 20 | MORGAN STANLEY | $20.5M | 719K | ▲+108% Added · +373K sh | Q1 2026 | |
| 21 | DAFNA Capital Management LLC | $17.0M | 597K | —Held | Q1 2026 | |
| 22 | Grandeur Peak Global Advisors, LLC | $16.4M | 587K | ▲+54% Added · +205K sh | Q2 2026 | |
| 23 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | $16.7M | 585K | ▲+15% Added · +74K sh | Q1 2026 | |
| 24 | UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | $15.8M | 555K | ▼−2.6% Reduced · −15K sh | Q1 2026 | |
| 25 | OSTERWEIS CAPITAL MANAGEMENT INC | $14.0M | 501K | ▲+43% Added · +152K sh | Q2 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, 6 funds opened a new position in ATRC and 28 added to an existing one, while 17 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 |
|---|---|---|
| NVIDIA CORPNVDA | 106 funds | $329.3B |
| MICROSOFT CORPMSFT | 106 funds | $230.0B |
| ELI LILLY & COLLY | 106 funds | $63.8B |
| AMAZON.COM INCAMZN | 103 funds | $168.7B |
| META PLATFORMS INC-CLASS AMETA | 103 funds | $93.7B |
| JPMORGAN CHASE & COJPM | 103 funds | $52.6B |
| APPLE INCAAPL | 102 funds | $248.7B |
| ALPHABET INC-CL AGOOGL | 102 funds | $134.0B |
| COSTCO WHOLESALE CORPCOST | 102 funds | $31.0B |
| MICRON TECHNOLOGY INCMU | 101 funds | $32.8B |
| LAM RESEARCH CORPLRCX | 101 funds | $30.8B |
| VISA INC-CLASS A SHARESV | 100 funds | $48.5B |
Ranked by how many of ATRC's institutional holders also hold each name, a cross-fund conviction signal.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Aug 24, 2026 | Dahlquist Karl S. | Chief Legal Officer | Sell (S) | 9K | $458K |
| Aug 5, 2026 | Prange Karen | Director | Sell (S) | 4K | $138K |
| Aug 5, 2026 | Yuen Maggie | Director | Sell (S) | 4K | $134K |
| Jul 29, 2026 | Noznesky Justin J | Chief Mktg & Strategy Officer | Sell (S) | 6K | $240K |
| Jul 28, 2026 | Doraiswamy Vinayak | Chief Scientific Officer | Sell (S) | 6K | $233K |
| Jul 28, 2026 | WEHRWEIN SVEN | Director | Sell (S) | 25K | $946K |
| May 20, 2026 | Prange Karen | Director | Sell (S) | 3K | $86K |
| May 15, 2026 | Doraiswamy Vinayak | Chief Scientific Officer | Sell (S) | 5K | $141K |
| Mar 12, 2026 | Doraiswamy Vinayak | Chief Scientific Officer | Sell (S) | 5K | $149K |
| Nov 26, 2025 | Noznesky Justin J | Chief Mktg & Strategy Officer | Sell (S) | 5K | $193K |
| Nov 25, 2025 | WEHRWEIN SVEN | Director | Sell (S) | 5K | $189K |
| Nov 24, 2025 | WEHRWEIN SVEN | Director | Sell (S) | 5K | $188K |
Connected entities for ATRC
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/ATRC/capital-change-brief"
Use Arkolith's capital_change_brief for ATRC. 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 ATRC. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.