Among active 13F managers last quarter, 2 opened and 5 added, while 2 reduced; the largest holder to move was Avenir Corp (−0.5%). Over the last 180 days, 2 insiders bought and none sold, a net +$149K in open-market trades.
Funds lean in and no leg opposes.
47 tracked 13F filers disclose a position in CTSO as of the latest SEC 13F filings, a combined $6.4M 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 | Avenir Corp | 5.2M | $1.9M | ▼−0.5% Reduced · −27K sh | Q2 2026 | |
| 2 | Vanguard Capital Management LLC | 1.9M | $716K | ▲+1.8% Added · +34K sh | Q2 2026 | |
| 3 | Neuberger Berman Group LLC | 1.7M | $951K | ▲+3.5% Added · +57K sh | Q1 2026 | |
| 4 | CM Management, LLC | 1.5M | $552K | —Held | Q2 2026 | |
| 5 | Skylands Capital, LLC | 1.2M | $453K | ▼−29% Reduced · −496K sh | Q2 2026 | |
| 6 | BlackRock, Inc. | 627K | $235K | ▼−20% Reduced · −156K sh | Q2 2026 | |
| 7 | Geode Capital Management, LLC | 602K | $225K | ▼−15% Reduced · −105K sh | Q2 2026 | |
| 8 | Sargent Investment Group, LLC | 556K | $208K | ▲+1.1% Added · +6K sh | Q2 2026 | |
| 9 | Pathstone Holdings, LLC | 500K | $187K | ▼~0% Reduced · −45 sh | Q2 2026 | |
| 10 | Vanguard Fiduciary Trust Co | 316K | $118K | ▲+0.7% Added · +2K sh | Q2 2026 | |
| 11 | CIBC Bancorp USA Inc. | 173K | $98K | ▲New +173K sh | Q1 2026 | |
| 12 | State Street Corp | 159K | $60K | —Held | Q2 2026 | |
| 13 | Osaic Holdings, Inc. | 130K | $74K | —Held | Q1 2026 | |
| 14 | UBS Group AG | 115K | $65K | ▼−0.1% Reduced · −72 sh | Q1 2026 | |
| 15 | Raymond James Financial Inc | 108K | $61K | ▼−0.9% Reduced · −951 sh | Q1 2026 | |
| 16 | NWF Advisory Services Inc. | 104K | $39K | —Held | Q2 2026 | |
| 17 | Renaissance Technologies LLC | 101K | $57K | ▲+0.6% Added · +600 sh | Q1 2026 | |
| 18 | Morgan Stanley | 100K | $57K | ▼−14% Reduced · −16K sh | Q1 2026 | |
| 19 | Northern Trust Corp | 93K | $52K | —Held | Q1 2026 | |
| 20 | Key Client Fiduciary Advisors, LLC | 78K | $29K | —Held | Q2 2026 | |
| 21 | Stifel Financial Corp | 48K | $27K | —Held | Q1 2026 | |
| 22 | Goldman Sachs Group Inc | 44K | $25K | ▲+22% Added · +8K sh | Q1 2026 | |
| 23 | Bank Of America Corp | 39K | $22K | ▲+1.1% Added · +417 sh | Q1 2026 | |
| 24 | XTX Topco Ltd | 36K | $20K | ▲+20% Added · +6K sh | Q1 2026 | |
| 25 | Susquehanna International Group, LLP | 30K | $17K | ▼−64% Reduced · −53K 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, 2 funds opened a new position in CTSO and 5 added to an existing one, while 2 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 | 18 funds | $6.1B |
| Apple IncAAPL | 17 funds | $7.7B |
| Amazon.com IncAMZN | 17 funds | $6.1B |
| Alphabet Inc-CL CGOOG | 17 funds | $3.7B |
| Berkshire Hathaway Inc-CL BBRK/B | 17 funds | $1.8B |
| Nvidia CorpNVDA | 16 funds | $10.2B |
| Alphabet Inc-CL AGOOGL | 16 funds | $4.3B |
| JPMorgan Chase & CoJPM | 16 funds | $3.6B |
| Meta Platforms Inc-Class AMETA | 16 funds | $2.8B |
| Costco Wholesale CorpCOST | 16 funds | $1.6B |
| Visa Inc-Class A SharesV | 16 funds | $1.6B |
| General ElectricGE | 16 funds | $1.5B |
Ranked by how many of CTSO's tracked holders also hold each name. The last column is those co-holders' combined reported position in that name, not in CTSO.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Jun 15, 2026 | Chan Phillip P. | Chief Executive Officer, Director | Buy (P) | 10K | $4K |
| Jun 15, 2026 | Mariani Peter J | Chief Financial Officer | Buy (P) | 100K | $44K |
| Jun 12, 2026 | Chan Phillip P. | Chief Executive Officer, Director | Buy (P) | 251K | $100K |
| Dec 13, 2024 | Mariani Peter J | Chief Financial Officer | Buy (P) | 20K | $19K |
| Dec 12, 2024 | Mariani Peter J | Chief Financial Officer | Buy (P) | 20K | $18K |
| Dec 11, 2024 | Mariani Peter J | Chief Financial Officer | Buy (P) | 11K | $10K |
| Dec 13, 2023 | Sobel Alan D. | Director | Buy (P) | 23K | $30K |
| Dec 13, 2023 | Chan Phillip P. | Chief Executive Officer, Director | Buy (P) | 75K | $100K |
| Dec 13, 2023 | Deliargyris Efthymios | Chief Medical Officer | Buy (P) | 23K | $30K |
| Dec 13, 2023 | Kim Jiny | Director | Buy (P) | 8K | $10K |
| Dec 13, 2023 | Jones Edward Raymond | Director | Buy (P) | 8K | $10K |
| Dec 13, 2023 | Bator Michael G. | Director | Buy (P) | 38K | $50K |
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 | 10 | 12 | – |
Insiders Form 4 open-market | 2 | 0 | +$149K |
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 CTSO
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/CTSO/capital-change-brief"
Use Arkolith's capital_change_brief for CTSO. 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 CTSO. Filings are public domain, sourced to SEC EDGAR.