144 ·Filed May 7, 2026
Form 144 — notice of proposed sale of securities
Actionable Insight • Neutral
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.
Final — all horizons settled through T+60d
CSTL ▲ +57.24% at T+60d
NEUTRAL call +57.24% · α vs SPY +52.40% · entry $19.83 → $31.18
T+1d
-3.98%
call -3.98% · α -4.22%
$19.04
settled 6mo ago
T+5d
-4.79%
call -4.79% · α -6.25%
$18.88
settled 6mo ago
T+20d
+5.95%
call +5.95% · α +5.93%
$21.01
settled 5mo ago
T+60d
+57.24%
call +57.24% · α +52.40%
$31.18
settled 3mo ago
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.
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)
Investment Themes
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 |
31 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 21, 2026 5d ago | Insider Cluster | $33.19 $33.08 | ▼ −0.33% | ▲ +0.19% | $33.74 (+1.66%) |
Oct 5, 2026 21d ago | 144 | $33.36 $33.00 | ▼ −1.08% | ▼ −0.84% | $33.74 (+1.14%) |
Oct 5, 2026 21d ago | Insider Cluster | $33.36 $33.00 | ▼ −1.08% | ▼ −0.84% | $33.74 (+1.14%) |
Sep 23, 2026 4w ago | Insider Cluster | $35.19 $35.81 | ▼ −1.76% | ▼ −1.22% | $33.74 (+4.12%) |
Sep 16, 2026 5w ago | Insider Cluster | $36.78 $35.34 | ▼ −3.92% | ▼ −4.04% | $33.74 (−8.27%) |
Sep 11, 2026 6w ago | 144 | $33.44 $35.50 | ▲ +6.16% | ▲ +6.62% | $33.74 (+0.90%) |
Sep 3, 2026 7w ago | Insider Cluster | $32.91 $32.76 | ▲ +0.46% | ▼ −0.09% | $33.74 (−2.52%) |
Sep 2, 2026 7w ago | Insider Cluster | $32.65 $32.91 | ▲ +0.80% | ▲ +1.18% | $33.74 (+3.34%) |
Sep 1, 2026 7w ago | Insider Cluster | $33.42 $32.65 | ▼ −2.30% | ▼ −3.35% | $33.74 (+0.96%) |
Aug 27, 2026 8w ago | Insider Cluster | $33.50 $33.03 | ▼ −1.40% | ▼ −1.10% | $33.74 (+0.72%) |
Showing 10 of 31
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