MBX MBX Biosciences, Inc.
BEARISH
Impact: 5/10
144
Form 144 — notice of proposed sale of securities
Latest settled — T+20d
MBX ▲ +2.92% at T+20d
SHORT call ✗ call lost -2.92% · α vs SPY +2.36% · entry $29.78 → $30.65
Last close $29.00 (close Jun 8) · +2.62% from $29.78 entry (call sign-flipped)
T+1d
-1.14%
call +1.14% · α +0.80%
$29.44
settled 5w ago
T+5d
+16.55%
call -16.55% · α -14.21%
$34.71
settled 5w ago
T+20d
+2.92%
call -2.92% · α +2.36%
$30.65
settled 9d ago
T+60d
—
call — · α —
—
in 7w
Price Chart
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Executive Summary
Former officer Richard Bartram files Form 144 to sell 5,000 MBX shares (~$159k), adding to 21,484 shares already sold in the prior two months. The consistent insider selling pattern raises concerns about confidence in the company's near-term outlook.
Actionable Insight
The insider's persistent selling warrants caution. Watch for further Form 144 or Form 4 filings; a cessation of sales could stabilize sentiment.
Key Facts
- Bartram Richard, a former officer, filed Form 144 to sell 5,000 shares of common stock.
- Estimated market value of proposed sale is $159,000.
- Sold 21,484 shares in three prior transactions since mid-March 2026.
- Total insider disposition over ~2 months: 26,484 shares.
Financial Impact
Proposed sale of 5,000 shares valued at ~$159k; cumulative insider sales ~$830k over 2 months.
Risk Factors
- Continued insider selling may signal weakening confidence in MBX's fundamentals.
- Potential negative market perception of insider distribution pattern.
Market Snapshot
Exchange
Nasdaq
Sector
Pharmaceutical Preparations
Analyst Consensus
87% bullish (15 analysts)
Documents Analyzed
This report is based on 3 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| 144 Filing (Primary) | 0001959173-26-003192 |
| Document: 0001959173-26-003192-index.html | 0001959173-26-003192 |
| Document: 0001959173-26-003192.txt | 0001959173-26-003192 |
17 reports for MBX
100%
Hit rate
best @ T+5▲ +22.70%
Filters
Rows
| Type | Now | ||||
|---|---|---|---|---|---|
|
Jun 9, 2026
today
|
144
| $29.80 awaiting T+5 | awaiting T+5 | — | $29.00 (+2.68%) |
|
Jun 5, 2026
4d ago
|
8-K
| $30.59 awaiting T+5 | awaiting T+5 | — | $29.00 (−5.20%) |
|
May 11, 2026
29d ago
|
144
| $40.08 $30.98 | ▲ +22.70% | ▲ +22.62% | $29.00 (+27.64%) |
|
May 11, 2026
29d ago
|
Press Release
| $40.08 $30.98 | ▼ −22.70% | ▼ −22.62% | $29.00 (−27.64%) |
|
May 8, 2026
4w ago
|
144
| $40.97 $35.36 | ▼ −13.68% | ▼ −15.15% | $29.00 (−29.21%) |
|
May 7, 2026
4w ago
|
144
| $34.71 $37.50 | ▲ +8.04% | ▲ +6.53% | $29.00 (−16.45%) |
|
May 7, 2026
4w ago
|
8-K
| $34.71 $37.50 | ▲ +8.04% | ▲ +6.53% | $29.00 (−16.45%) |
|
May 6, 2026
4w ago
|
144
| $32.12 $36.98 | ▲ +15.13% | ▲ +14.00% | $29.00 (−9.71%) |
|
May 6, 2026
5w ago
|
Insider Cluster
| $40.08 $30.98 | ▼ −22.70% | ▼ −22.62% | $29.00 (−27.64%) |
|
May 1, 2026
5w ago
|
144
| $29.78 $34.71 | ▼ −16.55% | ▼ −14.21% | $29.00 (+2.62%) |
Showing 10 of 17
US Market Status
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