Among active 13F managers last quarter, 19 opened and 8 added, while 13 reduced; the largest holder to move was Bard Associates Inc (−2.6%). Over the last 180 days, 3 insiders sold and none bought, a net -$369K in open-market trades.
The legs disagree, or only one of them leans.
82 tracked 13F filers disclose a position in OSS as of the latest SEC 13F filings, a combined $136.0M 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 | BlackRock, Inc. | 1.8M | $33.4M | ▲+208% Added · +1.2M sh | Q2 2026 | |
| 2 | Vanguard Capital Management LLC | 975K | $17.7M | ▲+1.6% Added · +15K sh | Q2 2026 | |
| 3 | Jane Street Group, LLC | 875K | $6.6M | ▲+45% Added · +271K sh | Q1 2026 | |
| 4 | Geode Capital Management, LLC | 573K | $10.4M | ▲+127% Added · +320K sh | Q2 2026 | |
| 5 | Bard Associates Inc | 526K | $9.6M | ▼−2.6% Reduced · −14K sh | Q2 2026 | |
| 6 | Morgan Stanley | 432K | $3.3M | ▲+594% Added · +370K sh | Q1 2026 | |
| 7 | Marshall Wace, LLP | 419K | $3.2M | ▲+53% Added · +145K sh | Q1 2026 | |
| 8 | Palisades Investment Partners, LLC | 414K | $7.5M | ▲New +414K sh | Q2 2026 | |
| 9 | UBS Group AG | 407K | $3.1M | ▲58× Added · +400K sh | Q1 2026 | |
| 10 | Millennium Management LLC | 401K | $3.0M | ▲+865% Added · +359K sh | Q1 2026 | |
| 11 | State Street Corp | 384K | $7.0M | ▲+278% Added · +283K sh | Q2 2026 | |
| 12 | Renaissance Technologies LLC | 260K | $2.0M | ▼−31% Reduced · −116K sh | Q1 2026 | |
| 13 | Susquehanna International Group, LLP | 236K | $1.8M | ▼−8.8% Reduced · −23K sh | Q1 2026 | |
| 14 | Sei Investments Co | 167K | $1.3M | ▲+67% Added · +67K sh | Q1 2026 | |
| 15 | Vanguard Fiduciary Trust Co | 157K | $2.9M | ▲+22% Added · +29K sh | Q2 2026 | |
| 16 | Vanguard Portfolio Management LLC | 155K | $2.8M | ▲New +155K sh | Q2 2026 | |
| 17 | Informed Momentum Co LLC | 131K | $2.4M | ▼−4.0% Reduced · −5K sh | Q2 2026 | |
| 18 | Trexquant Investment LP | 98K | $1.8M | ▼−55% Reduced · −119K sh | Q2 2026 | |
| 19 | Goldman Sachs Group Inc | 77K | $583K | ▼−40% Reduced · −52K sh | Q1 2026 | |
| 20 | Citigroup Inc | 76K | $573K | ▲17× Added · +71K sh | Q1 2026 | |
| 21 | Mirae Asset Global Etfs Holdings Ltd. | 74K | $559K | ▲New +74K sh | Q1 2026 | |
| 22 | Eddie Patel Inc | 73K | $1.3M | ▲+8.7% Added · +6K sh | Q2 2026 | |
| 23 | Citadel Advisors LLC | 71K | $1.3M | ▼−80% Reduced · −285K sh | Q2 2026 | |
| 24 | Squarepoint Ops LLC | 58K | $443K | ▼−60% Reduced · −89K sh | Q1 2026 | |
| 25 | XTX Topco Ltd | 51K | $385K | ▼−7.2% Reduced · −4K 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, 19 funds opened a new position in OSS and 8 added to an existing one, while 13 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 |
|---|---|---|
| Amazon.com IncAMZN | 40 funds | $36.2B |
| Nvidia CorpNVDA | 39 funds | $90.1B |
| Apple IncAAPL | 38 funds | $59.2B |
| Microsoft CorpMSFT | 38 funds | $42.4B |
| Micron Technology IncMU | 38 funds | $20.7B |
| Alphabet Inc-CL AGOOGL | 37 funds | $42.8B |
| Alphabet Inc-CL CGOOG | 37 funds | $26.3B |
| Meta Platforms Inc-Class AMETA | 37 funds | $22.3B |
| Berkshire Hathaway Inc-CL BBRK/B | 37 funds | $7.1B |
| Advanced Micro DevicesAMD | 36 funds | $24.2B |
| Tesla IncTSLA | 36 funds | $14.9B |
| Costco Wholesale CorpCOST | 36 funds | $3.7B |
Ranked by how many of OSS's tracked holders also hold each name. The last column is those co-holders' combined reported position in that name, not in OSS.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| May 26, 2026 | Bassett David George | Director | Sell (S) | 8K | $141K |
| May 26, 2026 | Herbets Mitchell H | Director | Sell (S) | 5K | $88K |
| May 26, 2026 | Matz Gregory W | Director | Sell (S) | 8K | $140K |
| Aug 14, 2024 | Manko Joseph M. Jr. | Director | Buy (P) | 25K | $50K |
| Aug 13, 2024 | Manko Joseph M. Jr. | Director | Buy (P) | 50K | $97K |
| Jan 22, 2024 | Cooper Steve D | 10% Owner | Sell (S) | 206K | $373K |
| Aug 16, 2023 | Knowles Michael | Chief Executive Officer | Buy (P) | 1K | $2K |
| Aug 15, 2023 | Matz Gregory W | Director | Buy (P) | 3K | $4K |
| Aug 14, 2023 | Raun David | Director | Buy (P) | 5K | $10K |
| Jul 31, 2023 | Cooper Steve D | 10% Owner | Sell (S) | 204K | $570K |
| Apr 21, 2023 | Cooper Steve D | 10% Owner | Sell (S) | 204K | $472K |
| Dec 20, 2022 | Cooper Steve D | 10% Owner | Sell (S) | 200K | $541K |
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 | 25 | 20 | – |
Insiders Form 4 open-market | 0 | 3 | -$369K |
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 OSS
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/OSS/capital-change-brief"
Use Arkolith's capital_change_brief for OSS. 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 OSS. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.