Among active 13F managers last quarter, 3 opened and 4 added, while 4 reduced; the largest holder to move was Compass Financial Management LLC (new position). No open-market insider trades in the last 180 days.
Funds lean in and no leg opposes.
48 tracked 13F filers disclose a position in ATNM as of the latest SEC 13F filings, a combined $5.0M 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 | Vanguard Capital Management LLC | 1.2M | $1.2M | ▼−1.4% Reduced · −17K sh | Q2 2026 | |
| 2 | Compass Financial Management LLC | 600K | $588K | ▲New +600K sh | Q2 2026 | |
| 3 | Millennium Management LLC | 565K | $562K | ▼−6.2% Reduced · −37K sh | Q1 2026 | |
| 4 | Renaissance Technologies LLC | 472K | $469K | ▲+21% Added · +81K sh | Q1 2026 | |
| 5 | BlackRock, Inc. | 396K | $388K | ▲+6.7% Added · +25K sh | Q2 2026 | |
| 6 | Two Sigma Investments, LP | 337K | $336K | ▲+61% Added · +127K sh | Q1 2026 | |
| 7 | Geode Capital Management, LLC | 325K | $319K | ▼−3.3% Reduced · −11K sh | Q2 2026 | |
| 8 | Gagnon Securities LLC | 182K | $178K | ▼−9.5% Reduced · −19K sh | Q2 2026 | |
| 9 | Vanguard Fiduciary Trust Co | 162K | $158K | ▲+0.8% Added · +1K sh | Q2 2026 | |
| 10 | Susquehanna International Group, LLP | 124K | $123K | ▲+50% Added · +42K sh | Q1 2026 | |
| 11 | State Street Corp | 122K | $120K | ▼−3.2% Reduced · −4K sh | Q2 2026 | |
| 12 | Northern Trust Corp | 76K | $75K | ▲+78% Added · +33K sh | Q1 2026 | |
| 13 | Goldman Sachs Group Inc | 70K | $70K | ▼−0.2% Reduced · −117 sh | Q1 2026 | |
| 14 | Vontobel Holding Ltd. | 50K | $49K | ▲+67% Added · +20K sh | Q2 2026 | |
| 15 | Bluespring Wealth Management, LLC | 43K | $42K | ▲New +43K sh | Q2 2026 | |
| 16 | Bridgeway Capital Management, LLC | 40K | $39K | —Held | Q2 2026 | |
| 17 | Dimensional Fund Advisors LP | 35K | $35K | —Held | Q1 2026 | |
| 18 | Jane Street Group, LLC | 34K | $34K | ▼−63% Reduced · −59K sh | Q1 2026 | |
| 19 | XTX Topco Ltd | 30K | $30K | ▲+16% Added · +4K sh | Q1 2026 | |
| 20 | Am Investment Strategies LLC | 29K | $29K | —Held | Q2 2026 | |
| 21 | Gerald Baker Financial Group LLC | 23K | $22K | —Held | Q2 2026 | |
| 22 | Mayport, LLC | 22K | $22K | —Held | Q2 2026 | |
| 23 | North Star Asset Management Inc | 20K | $20K | —Held | Q1 2026 | |
| 24 | Osaic Holdings, Inc. | 20K | $20K | ▼−2.0% Reduced · −400 sh | Q1 2026 | |
| 25 | Wells Fargo & Company | 20K | $20K | —Held | 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, 3 funds opened a new position in ATNM and 4 added to an existing one, while 4 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 |
|---|---|---|
| Nvidia CorpNVDA | 21 funds | $9.6B |
| Alphabet Inc-CL AGOOGL | 21 funds | $5.6B |
| Apple IncAAPL | 20 funds | $8.4B |
| Microsoft CorpMSFT | 20 funds | $5.4B |
| Alphabet Inc-CL CGOOG | 20 funds | $2.4B |
| Costco Wholesale CorpCOST | 20 funds | $2.0B |
| Berkshire Hathaway Inc-CL BBRK/B | 20 funds | $1.6B |
| Advanced Micro DevicesAMD | 20 funds | $1.4B |
| Amazon.com IncAMZN | 19 funds | $4.9B |
| Broadcom IncAVGO | 19 funds | $4.5B |
| Meta Platforms Inc-Class AMETA | 19 funds | $3.2B |
| JPMorgan Chase & CoJPM | 19 funds | $3.0B |
Ranked by how many of ATNM's tracked holders also hold each name. The last column is those co-holders' combined reported position in that name, not in ATNM.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Dec 10, 2018 | O'Loughlin Steve | Principal Financial Officer | Buy (P) | 10K | $4K |
| Dec 10, 2018 | Seth Sandesh | Chairman & CEO, Director | Buy (P) | 10K | $4K |
| Nov 19, 2018 | Ludwig Dale L. | Chief Scientific Officer | Buy (P) | 10K | $5K |
| Jul 17, 2018 | Seth Sandesh | CEO, Director | Buy (P) | 10K | $8K |
| Jun 15, 2018 | O'Loughlin Steve | Principal Financial Officer | Buy (P) | 12K | $6K |
| Apr 19, 2018 | Seth Sandesh | Chairman & CEO, Director | Buy (P) | 5K | $2K |
| Feb 28, 2018 | Shetty Ajit | Director | Buy (P) | 23K | $10K |
| Aug 2, 2017 | Ray Nitya G. | Executive Vice President | Buy (P) | 10K | $8K |
| Aug 2, 2017 | Seth Sandesh | Chairman & CEO, Director | Buy (P) | 33K | $25K |
| Jun 15, 2017 | O'Loughlin Steve | Principal Financial Officer | Buy (P) | 4K | $4K |
| Jun 15, 2017 | Seth Sandesh | Chairman and CEO, Director | Buy (P) 2 lots, same day | 8K | $9K |
| Jun 15, 2017 | Berger Mark Stanley | Chief Medical Officer | Buy (P) | 5K | $6K |
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 | 11 | 14 | – |
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.
Connected entities for ATNM
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/ATNM/capital-change-brief"
Use Arkolith's capital_change_brief for ATNM. 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 ATNM. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.