Among active 13F managers last quarter, 13 opened and 21 added, while 11 reduced; the largest holder to move was AllianceBernstein L.P. (−1.6%). Over the last 180 days, 6 insiders sold and none bought, a net -$21.6M in open-market trades.
The legs disagree, or only one of them leans.
93 tracked 13F filers disclose a position in ARX as of the latest SEC 13F filings, a combined $697.2M 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 | Security Benefit Life Insurance Co | 5.9M | $68.8M | —Held | Q2 2026 | |
| 2 | FMR LLC | 5.6M | $66.0M | ▲+211% Added · +3.8M sh | Q2 2026 | |
| 3 | Keenan Capital, LLC | 4.0M | $46.8M | —Held | Q2 2026 | |
| 4 | Gilder Gagnon Howe & Co LLC | 3.7M | $43.7M | ▼−0.3% Reduced · −11K sh | Q2 2026 | |
| 5 | BlackRock, Inc. | 3.5M | $41.0M | ▲21× Added · +3.3M sh | Q2 2026 | |
| 6 | American Century Companies Inc | 3.2M | $42.6M | ▲+109% Added · +1.7M sh | Q1 2026 | |
| 7 | Barings LLC | 3.1M | $46.1M | —Held | Q1 2026 | |
| 8 | AllianceBernstein L.P. | 2.8M | $45.8M | ▼−1.6% Reduced · −46K sh | Q1 2026 | |
| 9 | Vanguard Portfolio Management LLC | 2.4M | $28.3M | ▲+14% Added · +305K sh | Q2 2026 | |
| 10 | Marshall Wace, LLP | 2.3M | $30.4M | ▲+553% Added · +1.9M sh | Q1 2026 | |
| 11 | JPMorgan Chase & Co | 2.0M | $26.9M | ▲+3.4% Added · +67K sh | Q1 2026 | |
| 12 | Cresset Asset Management, LLC | 1.8M | $21.6M | —Held | Q2 2026 | |
| 13 | Citadel Advisors LLC | 1.7M | $20.5M | ▲+53% Added · +604K sh | Q2 2026 | |
| 14 | Vanguard Capital Management LLC | 1.7M | $19.4M | ▼−15% Reduced · −282K sh | Q2 2026 | |
| 15 | Qube Research & Technologies Ltd | 931K | $12.4M | ▲New +931K sh | Q1 2026 | |
| 16 | State Street Corp | 901K | $10.6M | ▲24× Added · +863K sh | Q2 2026 | |
| 17 | Jane Street Group, LLC | 861K | $11.5M | ▲New +861K sh | Q1 2026 | |
| 18 | Geode Capital Management, LLC | 810K | $9.5M | ▲New +810K sh | Q2 2026 | |
| 19 | Susquehanna International Group, LLP | 708K | $9.5M | ▲New +708K sh | Q1 2026 | |
| 20 | UBS Group AG | 686K | $9.2M | ▲+28% Added · +150K sh | Q1 2026 | |
| 21 | Norges Bank | 665K | $10.9M | ▲New +665K sh | Q4 2025 | |
| 22 | G2 Investment Partners Management LLC | 640K | $7.5M | ▲+72% Added · +267K sh | Q2 2026 | |
| 23 | Walleye Capital LLC | 541K | $6.3M | ▲Added Added · +541K sh | Q2 2026 | |
| 24 | Lighthouse Investment Partners, LLC | 488K | $5.7M | ▲+472% Added · +403K sh | Q2 2026 | |
| 25 | ArrowMark Colorado Holdings LLC | 477K | $5.6M | ▼−69% Reduced · −1.1M 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, 13 funds opened a new position in ARX and 21 added to an existing one, while 11 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 | 45 funds | $176.4B |
| Amazon.com IncAMZN | 45 funds | $83.7B |
| Microsoft CorpMSFT | 43 funds | $101.4B |
| Micron Technology IncMU | 43 funds | $28.0B |
| Meta Platforms Inc-Class AMETA | 42 funds | $47.8B |
| Eli Lilly & CoLLY | 42 funds | $39.2B |
| Visa Inc-Class A SharesV | 42 funds | $27.9B |
| Lam Research CorpLRCX | 42 funds | $21.0B |
| Costco Wholesale CorpCOST | 42 funds | $11.6B |
| Advanced Micro DevicesAMD | 41 funds | $31.2B |
| JPMorgan Chase & CoJPM | 41 funds | $22.3B |
| Mastercard Inc - AMA | 41 funds | $22.2B |
Ranked by how many of ARX's tracked holders also hold each name. The last column is those co-holders' combined reported position in that name, not in ARX.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Aug 21, 2026 | Meriwether Karen Sue | Director | Sell (S) | 542 | $11K |
| Aug 13, 2026 | Hasley Nancy | Director | Sell (S) | 20K | $401K |
| Aug 11, 2026 | ONeill Francis James | Co-Founder, Chief U/W Officer | Sell (S) | 89K | $1.1M |
| Aug 10, 2026 | Radke Jeffrey L | Co-Founder, CEO, Director, 10% Owner | Sell (S) | 80K | $967K |
| Aug 10, 2026 | ONeill Francis James | Co-Founder, Chief U/W Officer | Sell (S) | 64K | $768K |
| Aug 3, 2026 | Radke Jeffrey L | Co-Founder, CEO, Director, 10% Owner | Sell (S) | 80K | $965K |
| Jul 28, 2026 | ONeill Francis James | Co-Founder, Chief U/W Officer | Sell (S) | 105K | $1.5M |
| Jul 27, 2026 | Sternberg Matthew David | COO, Risk Exchange | Sell (S) | 18K | $257K |
| Jul 27, 2026 | Radke Jeffrey L | Co-Founder, CEO, Director, 10% Owner | Sell (S) 2 lots, same day | 95K | $1.4M |
| Jul 27, 2026 | ONeill Francis James | Co-Founder, Chief U/W Officer | Sell (S) | 110K | $1.6M |
| Jul 20, 2026 | Radke Jeffrey L | Co-Founder, CEO, Director, 10% Owner | Sell (S) | 80K | $1.1M |
| Jul 17, 2026 | Radke Jeffrey L | Co-Founder, CEO, Director, 10% Owner | Sell (S) | 15K | $211K |
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 | 37 | 18 | – |
Insiders Form 4 open-market | 0 | 6 | -$21.6M |
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 ARX
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/ARX/capital-change-brief"
Use Arkolith's capital_change_brief for ARX. 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 ARX. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.