# CSS LLC 13F holdings

> Latest reported SEC 13F equity book. Teaser: top 10 of 739 long-equity positions.
> CIK 1103646. Latest filing Q1 2026, as of quarter end 2026-03-31. Long-equity book $1.8B.

## Top holdings (teaser)

| # | Ticker | Issuer | Value | % of book | Change |
|---|--------|--------|-------|-----------|--------|
| 1 | LITE 0.5 06/15/28 | Lumentum Hldgs Inc | $216.5M | 12.0% | Held |
| 2 | SATS 3.875 11/30/30 | Echostar Corp | $146.6M | 8.2% | Added |
| 3 | JAZZ 2 06/15/26 | Jazz Investments I Ltd | $63.9M | 3.6% | Reduced |
| 4 | LYV 3.125 01/15/29 | Live Nation Entertainment In | $49.9M | 2.8% | Held |
| 5 | RIG 4.625 09/30/29 * | Transocean Inc | $49.5M | 2.8% | Reduced |
| 6 | BTU 3.25 03/01/28 | Peabody Engr Corp | $37.8M | 2.1% | Reduced |
| 7 | NEE 7.375 02/15/29 | NextEra Energy Inc | $27.2M | 1.5% | New |
| 8 | CNP 4.25 08/15/26 | Centerpoint Energy Inc | $24.9M | 1.4% | New |
| 9 | ALNY 1 09/15/27 | Alnylam Pharmaceuticals Inc | $23.9M | 1.3% | New |
| 10 | RSP | Invesco Exchange Traded FD T | $19.9M | 1.1% | Added |

## Latest moves

Bought: NEE 7.375 02/15/29, CNP 4.25 08/15/26, ALNY 1 09/15/27
Sold: JAZZ 2 06/15/26, RIG 4.625 09/30/29 *, BTU 3.25 03/01/28

Counts and totals reflect the 13F filers and securities Arkolith tracks, not the entire institutional universe. Option legs are excluded from the book above.

## Full data via the API and MCP

This page is a teaser. The complete book, full quarter-over-quarter history, and per-datapoint
provenance are available through the metered REST API and MCP server.

- Endpoint: https://arkolith.com/api/mcp (transport: streamable-http)
- Auth: Bearer API key. Mint one and copy a ready-to-paste command at https://arkolith.com/connect
- Claude Code: `claude mcp add --transport http arkolith https://arkolith.com/api/mcp --header "Authorization: Bearer YOUR_API_KEY"`
- Discovery: `tools/list` is free; `tools/call` is metered by credits.

### Machine-readable
- Tool catalog JSON: https://arkolith.com/api/mcp/catalog
- MCP descriptor: https://arkolith.com/.well-known/mcp.json
- OpenAPI 3.1 REST spec: https://arkolith.com/openapi.json
- Full LLM guide: https://arkolith.com/llms-full.txt
- Human docs: https://arkolith.com/docs

## Source and method

- Source: SEC EDGAR 13F-HR (public domain). Long-equity positions only (option legs excluded). Filed quarterly, about a 45-day lag.
- Primary source: https://www.sec.gov/Archives/edgar/data/1103646/000110364626000009/xslForm13F_X02/primary_doc.xml
- Human page: https://arkolith.com/fund/css-llc-il-1103646
- Per-datapoint lineage: call the `provenance.get` MCP tool for the source URL and fetch history behind any figure.

Paid product with a one-time evaluation grant at signup (no card to evaluate). Most calls cost 1 credit (~$0.01); heavier point-in-time / cross-source tools cost more.

_Latest disclosed public filings. Data, not investment advice._