SC 13G/A ·Filed Oct 29, 2026
Passive stake amendment
Actionable Insight • Neutral
Monitor for any future 13G amendments that cross the 5% threshold or a conversion to a 13D filing, which would signal a change in investment intent.
Latest settled: T+1d ⚠ clustered
CSTL ▼ -3.51% at T+1d
NEUTRAL call -3.51% · α vs SPY -1.73% · entry $38.51 → $37.16
T+1d
-3.51%
call -3.51% · α -1.73%
$37.16
settled 15h ago
T+5d
Pending
in 5d
T+20d
Pending
in 27d
T+60d
Pending
in 3mo
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Executive Summary
Principal Global Investors filed an amended Schedule 13G disclosing a 4.9% passive stake in Castle Biosciences, representing 1,500,897 shares as of September 30, 2026. The filing is a routine passive update with no change in investment intent, and the stake remains below the 5% threshold.
Key Financial Metrics
Stake
4.9%
Investor
PRINCIPAL GLOBAL INVESTORS
Investor Type
mutual fund
Key Facts
- Principal Global Investors reported beneficial ownership of 1,500,897 shares of Castle Biosciences common stock.
- The stake represents 4.9% of outstanding shares as of September 30, 2026.
- The filing is made under Rule 13d-1(b), confirming passive investment intent.
- The investor certified the shares were not acquired to change or influence control of the issuer.
Financial Impact
No material financial impact; passive stake disclosure below 5% threshold.
Risk Factors
- No material risks identified from this routine passive filing.
Market Snapshot
Exchange
Nasdaq
Sector
Services-Medical Laboratories
Analyst Consensus
93% bullish (15 analysts)
Investment Themes
Documents Analyzed
This report is based on 3 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| SC 13G/A Filing (Primary) | 0000769734-26-000056 |
| Document: 0000769734-26-000056-index.html | 0000769734-26-000056 |
| Document: 0000769734-26-000056.txt | 0000769734-26-000056 |
33 reports for CSTL
60% Hit rate @ T+1 Went positive at some point 9 of 10 best @ T+60▲ +27.32%
Filters
Rows
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 29, 2026 1d ago | SC 13G/A | $38.51 $37.16 | ▼ −3.51% | ▼ −1.73% | $37.16 (−3.51%) |
Oct 28, 2026 2d ago | Insider Cluster | $38.51 $37.16 | ▼ −3.51% | ▼ −1.73% | $37.16 (−3.51%) |
Oct 21, 2026 9d ago | Insider Cluster | $33.19 $33.08 | ▼ −0.33% | ▲ +0.19% | $37.16 (+11.96%) |
Oct 5, 2026 25d ago | 144 | $33.36 $33.00 | ▼ −1.08% | ▼ −0.84% | $37.16 (+11.39%) |
Oct 5, 2026 25d ago | Insider Cluster | $33.36 $33.00 | ▼ −1.08% | ▼ −0.84% | $37.16 (+11.39%) |
Sep 23, 2026 5w ago | Insider Cluster | $35.19 $35.81 | ▼ −1.76% | ▼ −1.22% | $37.16 (−5.60%) |
Sep 16, 2026 6w ago | Insider Cluster | $36.78 $35.34 | ▼ −3.92% | ▼ −4.04% | $37.16 (+1.03%) |
Sep 11, 2026 7w ago | 144 | $33.44 $35.50 | ▲ +6.16% | ▲ +6.62% | $37.16 (+11.12%) |
Sep 3, 2026 8w ago | Insider Cluster | $32.91 $32.76 | ▲ +0.46% | ▼ −0.09% | $37.16 (−12.91%) |
Sep 2, 2026 8w ago | Insider Cluster | $32.65 $32.91 | ▲ +0.80% | ▲ +1.18% | $37.16 (+13.81%) |
Showing 10 of 33
US Market Status
Market Closed · Opens Mon (34h 30m)
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