CBIO
CRESCENT BIOPHARMA, INC. · Healthcare · Market cap $489.2M
Insiders bought $10.9M net in the last 90 days ·7 sellers, 1 buyer· 16 of 16 sales under Rule 10b5-1 plans· latest Form 4 filed Sep 18, 2026
Insider Buying
$30.6M
reported purchases (SEC code P)
Insider Selling
$1.5M
reported sales (SEC code S)
Unique Insiders
8
in the rolling window
Latest filing
Sep 18, 2026
Brumm Joshua T
CRESCENT BIOPHARMA, INC. (CBIO) has 24 SEC Form 4 filings (34 transaction rows) in the rolling window, disclosed by 8 distinct insiders. Most recent filing: Sep 18, 2026.
Inside the rolling window, 8 insiders at CRESCENT BIOPHARMA, INC. reported 2 open-market purchases totaling $30.6M and 16 open-market sales totaling $1.5M. The most active filer is Chief Executive Officer Brumm Joshua T with 3 filings. Insiders have net bought $10.9M over the trailing 6 months. The largest single insider purchase in this window was $12.4M by Director, 10% Owner Fairmount Funds Management LLC on Jul 16, 2026. The most recent open-market filing is a sale of 1,610 shares by Chief Executive Officer Brumm Joshua T, dated Sep 16, 2026, worth $29K.
- Industry:Biotechnology
- CEO:Joshua T. Brumm
- Employees:44
- HQ:Waltham, MA, US
- IPO:2014-01-10
| Source | |||||||
|---|---|---|---|---|---|---|---|
| Chief Executive Officer | Sale | 1,610 | $29K | Sep 18 | -22.0% | SEC ↗ | |
| Chief Executive Officer | Sale | 7,837 | $131K | Sep 18 | -22.0% | SEC ↗ | |
| President and COO | Sale | 731 | $13K | Sep 18 | -22.0% | SEC ↗ | |
| President and COO | Sale | 3,839 | $64K | Sep 18 | -22.0% | SEC ↗ | |
| See Remarks | Sale | 620 | $11K | Sep 18 | -22.0% | SEC ↗ | |
| Chief Medical Officer | Sale | 623 | $11K | Sep 18 | -22.0% | SEC ↗ | |
| Chief Scientific Officer | Sale | 658 | $12K | Sep 18 | -22.0% | SEC ↗ | |
| Chief Financial Officer | Sale | 568 | $10K | Sep 18 | -22.0% | SEC ↗ | |
| See Remarks | Sale | 240 | $4K | Sep 18 | -22.0% | SEC ↗ | |
| Director, 10% Owner | Purchase | 853,450 | $12.4M | Jul 20 | -12.5% | SEC ↗ | |
Im Ellie EunkyungFirst filing | Chief Medical Officer | Sale | 1,219 | $22K | Jun 23 | — | SEC ↗ |
Bispham Barbara HarlinFirst filing | See Remarks | Sale | 1,218 | $22K | Jun 23 | — | SEC ↗ |
Lynch RyanFirst filing | See Remarks | Sale | 465 | $8K | Jun 23 | — | SEC ↗ |
Scalzo Richard WilliamFirst filing | Chief Financial Officer | Sale | 1,112 | $20K | Jun 23 | — | SEC ↗ |
McNeill JonathanFirst filing | President and COO | Sale | 20,549 | $370K | Jun 23 | — | SEC ↗ |
Brumm Joshua TFirst filing | Chief Executive Officer | Sale | 42,305 | $761K | Jun 23 | — | SEC ↗ |
Pinkas JanFirst filing | Chief Scientific Officer | Sale | 1,288 | $23K | Jun 23 | — | SEC ↗ |
| Director, 10% Owner | Purchase | 1,360,000 | $18.2M | Dec 8 | — | SEC ↗ |
Frequently asked questions
How many SEC Form 4 insider filings does CBIO have?
CRESCENT BIOPHARMA, INC. (CBIO) has 24 SEC Form 4 filings (34 transaction rows) in the rolling 365-day window, disclosed by 8 distinct insiders. Most recent filing: Sep 18, 2026.
When was the most recent SEC Form 4 filing for CBIO?
The most recent Form 4 filing for CBIO on Tracefour is dated Sep 18, 2026.
Who is the most active insider at CBIO?
The most active SEC Form 4 filer at CBIO in the rolling window is Chief Executive Officer Brumm Joshua T, with 3 filings.
What is the net insider flow at CBIO over the last 6 months?
Over the trailing 180 days, insiders at CBIO have net bought $10.9M based on SEC Form 4 disclosures.
What was the largest insider purchase at CBIO?
The largest single insider open-market purchase at CBIO in the rolling window was $12.4M by Director, 10% Owner Fairmount Funds Management LLC on 2026-07-16.
What is the total insider buy and sell value at CBIO in the current window?
Inside the rolling window, insiders at CBIO bought $30.6M and sold $1.5M based on SEC Form 4 filings.
Can I get alerts for CBIO insider trading?
Yes. Tracefour sends a free email when a new SEC Form 4 purchase or sale is filed at CRESCENT BIOPHARMA, INC. (CBIO). Alerts are set per company from the page itself, there is no paid tier, and each email links to the original filing on SEC EDGAR.
Related companies
CRESCENT BIOPHARMA, INC. is in the Healthcare sector.