Castle Biosciences Inc (CSTL)
- Sector
- Health Care
- Last price
- $32.52
- As of
Kresmion compiles this page from CSTL's SEC filings, its 13F institutional holders and the market events Kresmion detects, each linked to its source.
CASTLE BIOSCIENCES INC (CSTL): 6 institutional managers tracked by Kresmion reported non-option positions in their 2026Q2 Form 13F filings, and the most recent SEC filing on record for the company is a Form 8-K filed 2026-11-05.
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Preview the CSTL dossierActive events for CSTL
- mediumEarnings above estimates
Q3-2026: Beat consensus by 65.3%, EPS $-0.13 vs $-0.3749 estimate
- high13F: large increase
CITADEL ADVISORS LLC added +68% to CSTL (2026Q2)
- high13F: large increase
Point72 Asset Management, L.P. added +199% to CSTL (2026Q2)
- high13F: large reduction
TWO SIGMA INVESTMENTS, LP cut 60% of CSTL (2026Q2)
- mediumEarnings above estimates
Q2-2026: Beat consensus by 83.1%, EPS $-0.07 vs $-0.4148 estimate
FREE, NO ACCOUNT
Every event on CSTL, as it fires
You are seeing 5 of 10 events recorded on CSTL since 2026-05-16.
The five above landed across 3 days. The other 5 were recorded on 3 other days.
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CSTL positions held by the managers we follow (2026Q2)
What the managers we follow bought and sold in Q2 2026
| Manager / security | Market value | % of reported value |
|---|---|---|
| RENAISSANCE TECHNOLOGIES LLC FundCUSIP 14843C105 · 2026Q2 | $8.9M | 0.01% |
| Point72 Asset Management, L.P. FundCUSIP 14843C105 · 2026Q2 | $8.5M | 0.01% |
| CITADEL ADVISORS LLC FundCUSIP 14843C105 · 2026Q2 | $6.3M | 0.00% |
| MILLENNIUM MANAGEMENT LLC FundCUSIP 14843C105 · 2026Q2 | $4.9M | 0.00% |
| D. E. Shaw & Co., Inc. FundCUSIP 14843C105 · 2026Q2 | $2.7M | 0.00% |
| TWO SIGMA INVESTMENTS, LP FundCUSIP 14843C105 · 2026Q2 | $2.4M | 0.00% |
Quarterly SEC Form 13F disclosures from the managers Kresmion tracks, not a complete ownership ranking. Non-option holdings only; reported put and call positions are excluded. Different securities are labeled by CUSIP. The share of reported value is each position's value over the sum of the values that manager reported for the quarter; option lines are not in that sum, as on each fund page. Values are reporting-period snapshots, not current position values. Filings can arrive up to 45 days after quarter-end.
Recent SEC filings, CSTL
- 8-KSEC EDGAR ↗
- 10-QSEC EDGAR ↗
- 10-QSEC EDGAR ↗
- 8-KSEC EDGAR ↗
- 8-KSEC EDGAR ↗
- 8-KSEC EDGAR ↗
- 10-QSEC EDGAR ↗
- 8-KSEC EDGAR ↗
- 10-KSEC EDGAR ↗
- 8-KSEC EDGAR ↗
More data on CSTL
CSTL against its peers
CSTL's operating margin of -12.4% ranks in the 17th percentile of 25 Health Care sub-industry peers, fiscal periods ending between 2025-10-03 and 2026-01-02.
| Metric | CSTL | Peer median | Percentile | n |
|---|---|---|---|---|
| Revenue FY | 344M USD | 781M USD | 29 | 25 |
| Gross margin | 79.4% | 63.7% | 97 | 17 |
| Operating margin | -12.4% | 0.4% | 17 | 25 |
| Net margin | -7.0% | -0.4% | 33 | 25 |
| Return on equity | -5.1% | -0.9% | 44 | 25 |
| P / E | n/a | 43.3x | n/a | 9 |
Peers (25): IRMD, PRCT, ATEC, OMDA, HSTM, GDRX, STAA, TNDM, TALK.D, PNTG, USPH, AHCO, VREX, BVS, ALHC, NVCR, TDOC, CNMD, EHAB.D, CERT, OMCL, AMN, LMAT, XRAY, WGS. Fiscal periods ending between 2025-10-03 and 2026-01-02. Every figure is one full fiscal year read from one annual filing (CSTL: 10-K), reported in USD. Nothing is trailing twelve months and nothing is converted between currencies. Source: SEC EDGAR XBRL company facts (public domain); prices from Kresmion's daily equity market-data snapshot. Open the full comparison.
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Cite this data
Kresmion counts the managers it follows that reported a non-option position in CSTL on Form 13F-HR for the latest reporting quarter, orders those positions by the value each filing reports, and lists the company's latest SEC filings and the events Kresmion recorded on CSTL in the last 180 days.
Upstream: SEC EDGAR filings for CSTL
Kresmion, "CASTLE BIOSCIENCES INC (CSTL) institutional holdings and SEC filings", data as of 2026-11-06, https://kresmion.com/research/CSTL. Upstream data: SEC EDGAR filings for CSTL.
Link to this data (HTML):
<a href="https://kresmion.com/research/CSTL">CASTLE BIOSCIENCES INC (CSTL) institutional holdings and SEC filings (Kresmion)</a>
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