CSTL CASTLE BIOSCIENCES INC
NEUTRAL
Impact: 3/10
144
Form 144 — notice of proposed sale of securities
Latest settled — T+20d
CSTL ▲ +5.95% at T+20d
NEUTRAL call ✓ call won +5.95% · α vs SPY +5.93% · entry $19.83 → $21.01
Last close $20.12 (close Jun 8) · +1.46% from $19.83 entry
T+1d
-3.98%
call -3.98% · α -4.22%
$19.04
settled 5w ago
T+5d
-4.79%
call -4.79% · α -6.25%
$18.88
settled 27d ago
T+20d
+5.95%
call +5.95% · α +5.93%
$21.01
settled 5d ago
T+60d
—
call — · α —
—
in 8w
Price Chart
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Executive Summary
CEO Derek Maetzold filed Form 144 indicating intent to sell 14,008 shares (~$269.5K) under a Rule 10b5-1 trading plan adopted in December 2025. The sale is pre-planned and represents a small fraction of total holdings and market cap, making it a routine diversification event.
Actionable Insight
The 10b5-1 plan provides cover for this sale; it is not a signal of distress. Monitor for any subsequent Form 4 filings to confirm execution and any changes in selling frequency. No immediate catalyst expected.
Key Facts
- CEO Derek Maetzold plans to sell 14,008 shares via Goldman Sachs.
- Estimated market value of the proposed sale is $269,513.92.
- Sale is part of a 10b5-1 plan adopted on December 3, 2025.
- Shares include those held directly and through various trusts.
- Only 1 insider sale ($14K) occurred in the past 30 days prior to this notice.
Financial Impact
~$270K, less than 0.04% of market cap
Risk Factors
- CEO selling may be perceived negatively by retail investors despite the 10b5-1 plan.
- If the company reports disappointing earnings in the near term, the sale could be viewed as poorly timed.
Market Snapshot
Exchange
Nasdaq
Sector
Services-Medical Laboratories
Analyst Consensus
93% bullish (14 analysts)
Documents Analyzed
This report is based on 3 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| 144 Filing (Primary) | 0001958244-26-000262 |
| Document: 0001958244-26-000262-index.html | 0001958244-26-000262 |
| Document: 0001958244-26-000262.txt | 0001958244-26-000262 |
10 reports for CSTL
83%
Hit rate
best @ T+60▲ +24.87%
Filters
Rows
| Type | Now | ||||
|---|---|---|---|---|---|
|
Jun 1, 2026
8d ago
|
144
| $19.71 $20.39 | ▲ +3.45% | ▲ +4.17% | $20.12 (+2.08%) |
|
May 7, 2026
4w ago
|
144
| $19.83 $19.04 | ▼ −3.98% | ▼ −4.22% | $20.12 (+1.46%) |
|
Apr 8, 2026
8w ago
|
DEFA14A
| $25.19 $23.43 | ▼ −6.99% | ▼ −7.56% | $20.12 (−20.13%) |
|
Mar 13, 2026
12w ago
|
Press Release
| $25.56 $25.83 | ▲ +1.06% | ▲ +0.03% | $20.12 (−21.28%) |
|
Mar 12, 2026
12w ago
|
Insider Cluster
| $25.32 $25.56 | ▼ −0.95% | ▼ −1.55% | $20.12 (+20.54%) |
|
Mar 12, 2026
12w ago
|
Insider Cluster
| $25.32 $25.56 | ▼ −0.95% | ▼ −1.55% | $20.12 (+20.54%) |
|
Mar 9, 2026
13w ago
|
Press Release
| $27.02 $26.60 | ▼ −1.55% | ▼ −1.37% | $20.12 (−25.54%) |
|
Mar 5, 2026
13w ago
|
Insider Cluster
| $27.91 $27.12 | ▲ +2.83% | ▲ +1.52% | $20.12 (+27.91%) |
|
Mar 5, 2026
13w ago
|
Insider Cluster
| $27.91 $27.12 | ▲ +2.83% | ▲ +1.52% | $20.12 (+27.91%) |
|
Mar 3, 2026
14w ago
|
Insider Cluster
| $27.57 $28.17 | ▲ +2.18% | ▲ +1.41% | $20.12 (−27.02%) |
Showing 10 of 10
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