Among active 13F managers last quarter, 7 opened and 36 added, while 9 reduced; the largest holder to move was American Century Companies Inc (−1.3%). Over the last 180 days, 5 insiders sold and 1 insider bought, a net -$5.4M in open-market trades.
The legs disagree, or only one of them leans.
246 tracked 13F filers disclose a position in ATEC 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 | Shares | Position value | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 10.1M | $109.8M | ▼−0.7% Reduced · −69K sh | Q1 2026 | |
| 2 | Braidwell LP | 6.5M | $56.5M | ▲+201% Added · +4.4M sh | Q2 2026 | |
| 3 | American Century Companies Inc | 6.4M | $69.9M | ▼−1.3% Reduced · −85K sh | Q1 2026 | |
| 4 | Vanguard Capital Management LLC | 4.9M | $53.5M | →New filer Inherited book · not a new buyer | Q1 2026 | |
| 5 | Royal Bank Of Canada | 4.5M | $49.1M | ▼−8.1% Reduced · −396K sh | Q1 2026 | |
| 6 | BNP Paribas Asset Management Holding S.A. | 3.6M | $39.3M | ▲+14% Added · +440K sh | Q1 2026 | |
| 7 | State Street Corp | 3.5M | $30.1M | ▲+15% Added · +450K sh | Q2 2026 | |
| 8 | Geode Capital Management, LLC | 3.2M | $27.6M | ▲+9.7% Added · +282K sh | Q2 2026 | |
| 9 | Nuveen, LLC | 2.8M | $31.0M | ▼−0.8% Reduced · −24K sh | Q1 2026 | |
| 10 | Millennium Management LLC | 2.8M | $30.6M | ▲+26% Added · +584K sh | Q1 2026 | |
| 11 | Tremblant Capital Group | 2.6M | $22.3M | ▲+18% Added · +386K sh | Q2 2026 | |
| 12 | Bank Of America Corp | 2.6M | $27.9M | ▲+27% Added · +543K sh | Q1 2026 | |
| 13 | Citadel Advisors LLC | 2.5M | $21.3M | ▲+187% Added · +1.6M sh | Q2 2026 | |
| 14 | Emerald Advisers, LLC | 2.1M | $18.2M | ▲+16% Added · +297K sh | Q2 2026 | |
| 15 | Two Sigma Investments, LP | 2.0M | $22.2M | ▲+3.8% Added · +75K sh | Q1 2026 | |
| 16 | UBS Group AG | 1.9M | $21.2M | ▲+38% Added · +535K sh | Q1 2026 | |
| 17 | Oberweis Asset Management Inc | 1.9M | $20.8M | ▲+91% Added · +908K sh | Q1 2026 | |
| 18 | Cerity Partners LLC | 1.8M | $19.8M | ▼−0.2% Reduced · −3K sh | Q1 2026 | |
| 19 | Goldman Sachs Group Inc | 1.7M | $19.0M | ▼−17% Reduced · −362K sh | Q1 2026 | |
| 20 | Morgan Stanley | 1.7M | $18.0M | ▼−62% Reduced · −2.7M sh | Q1 2026 | |
| 21 | Penn Capital Management Company, LLC | 1.5M | $12.9M | ▲+6.5% Added · +91K sh | Q2 2026 | |
| 22 | AQR Capital Management LLC | 1.4M | $15.1M | ▲+129% Added · +782K sh | Q1 2026 | |
| 23 | Northern Trust Corp | 1.4M | $14.8M | ▼−1.3% Reduced · −18K sh | Q1 2026 | |
| 24 | MetLife Investment Management, LLC | 1.3M | $14.4M | ▲+46% Added · +420K sh | Q1 2026 | |
| 25 | Deutsche Bank AG | 1.3M | $14.2M | ▼−61% Reduced · −2.0M 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. 1 value row is withheld because the reported units disagree with same-security peers; share counts are unchanged.
Last quarter, 7 funds opened a new position in ATEC and 36 added to an existing one, while 9 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 | 121 funds | $205.7B |
| Eli Lilly & CoLLY | 121 funds | $60.1B |
| Nvidia CorpNVDA | 119 funds | $296.0B |
| Amazon.com IncAMZN | 118 funds | $149.9B |
| Apple IncAAPL | 115 funds | $225.6B |
| Meta Platforms Inc-Class AMETA | 115 funds | $83.7B |
| Broadcom IncAVGO | 114 funds | $123.1B |
| Alphabet Inc-CL AGOOGL | 114 funds | $120.0B |
| Costco Wholesale CorpCOST | 114 funds | $28.4B |
| Chevron CorpCVX | 113 funds | $22.5B |
| JPMorgan Chase & CoJPM | 112 funds | $44.7B |
| Micron Technology IncMU | 112 funds | $31.0B |
Ranked by how many of ATEC's tracked holders also hold each name. The last column is those co-holders' combined reported position in that name, not in ATEC.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Aug 5, 2026 | Marshall Tyson Eliot | GENERAL COUNSEL & CORP. SEC. | Sell (S) | 8K | $79K |
| Jun 11, 2026 | McGinnis Karen K | Director | Sell (S) | 6K | $48K |
| May 11, 2026 | Valentine Keith | Director | Buy (P) | 35K | $245K |
| May 8, 2026 | Valentine Keith | Director | Buy (P) | 44K | $331K |
| May 7, 2026 | Valentine Keith | Director | Buy (P) | 56K | $421K |
| Mar 13, 2026 | Koning John Todd | CHIEF FINANCIAL OFFICER | Sell (S) | 80K | $986K |
| Mar 13, 2026 | Lish Scott | CHIEF OPERATING OFFICER | Sell (S) | 261K | $3.2M |
| Mar 11, 2026 | Sponsel David | EVP, SALES | Sell (S) | 163K | $2.0M |
| Mar 9, 2026 | Hunsaker Craig E | EVP, PEOPLE & CULTURE | Sell (S) | 83K | $1.0M |
| Mar 6, 2026 | Hunsaker Craig E | EVP, PEOPLE & CULTURE | Sell (S) | 34K | $411K |
| Mar 5, 2026 | Marshall Tyson Eliot | GENERAL COUNSEL & CORP. SEC. | Sell (S) | 89K | $1.1M |
| Feb 5, 2026 | Sponsel David | EVP, SALES | Sell (S) | 60K | $833K |
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 | 53 | 31 | – |
Insiders Form 4 open-market | 1 | 5 | -$5.4M |
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 |
|---|---|---|
| ATECthis pagecs | 246 funds | $1.1B |
| ATEC 0.75 03/15/30SDBCV | 27 funds | $392.7M |
| ATEC 0.75 08/01/26SDBCV | 9 funds | $67.3M |
Same issuer, multiple share classes. The consensus leaderboards count this company once across all classes; this is the per-class detail.
Connected entities for ATEC
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/ATEC/capital-change-brief"
Use Arkolith's capital_change_brief for ATEC. Tell me what changed, whether insider activity corroborates it, and cite the SEC evidence.
13F holdings + Form 4 insider transactions + the live filing stream, joined for ATEC. Filings are public domain, sourced to SEC EDGAR.