SPRO
Spero Therapeutics, Inc. · Healthcare · Market cap $73.4M
Insider Buying
$0
reported purchases (SEC code P)
Insider Selling
$552K
reported sales (SEC code S)
Unique Insiders
2
in the rolling window
Latest filing
Aug 6, 2026
Rajavelu Esther
Spero Therapeutics, Inc. (SPRO) has 14 SEC Form 4 filings (19 transaction rows) in the rolling window, disclosed by 2 distinct insiders. Most recent filing: Aug 6, 2026.
Inside the rolling window, 2 insiders at Spero Therapeutics, Inc. reported no open-market purchases and 8 open-market sales totaling $552K. The most active filer is See Remarks Rajavelu Esther with 4 filings. Insiders have net sold $315K over the trailing 6 months. The most recent open-market filing is a sale of 25,240 shares by See Remarks Rajavelu Esther, dated May 4, 2026, worth $63K.
- Industry:Biotechnology
- CEO:Esther Rajavelu
- Employees:25
- HQ:Cambridge, MA, US
- IPO:2017-11-02
| Source | |||||||
|---|---|---|---|---|---|---|---|
| See Remarks | Sale | 25,240 | $63K | May 7 | -49.8% | SEC ↗ | |
| See Remarks | Sale | 87,917 | $207K | Feb 9 | -46.6% | SEC ↗ | |
| Chief Operating Officer | Sale | 18,652 | $44K | Feb 9 | -46.6% | SEC ↗ | |
Keutzer TimothyFirst filing | Chief Operating Officer | Sale | 18,891 | $42K | Feb 5 | -45.2% | SEC ↗ |
Keutzer TimothyFirst filing | Chief Operating Officer | Sale | 24,224 | $52K | Feb 5 | -45.2% | SEC ↗ |
Keutzer TimothyFirst filing | Chief Operating Officer | Sale | 3,471 | $8K | Feb 5 | -45.2% | SEC ↗ |
| See Remarks | Sale | 18,442 | $41K | Feb 4 | -45.0% | SEC ↗ | |
Rajavelu EstherFirst filing | See Remarks | Sale | 40,270 | $95K | Nov 12 | -52.6% | SEC ↗ |
Frequently asked questions
How many SEC Form 4 insider filings does SPRO have?
Spero Therapeutics, Inc. (SPRO) has 14 SEC Form 4 filings (19 transaction rows) in the rolling 365-day window, disclosed by 2 distinct insiders. Most recent filing: Aug 6, 2026.
When was the most recent SEC Form 4 filing for SPRO?
The most recent Form 4 filing for SPRO on Tracefour is dated Aug 6, 2026.
Who is the most active insider at SPRO?
The most active SEC Form 4 filer at SPRO in the rolling window is See Remarks Rajavelu Esther, with 4 filings.
What is the net insider flow at SPRO over the last 6 months?
Over the trailing 180 days, insiders at SPRO have net sold $315K based on SEC Form 4 disclosures.
What is the total insider buy and sell value at SPRO in the current window?
Inside the rolling window, insiders at SPRO bought $0 and sold $552K based on SEC Form 4 filings.
Can I get alerts for SPRO insider trading?
Yes. Tracefour sends a free email when a new SEC Form 4 purchase or sale is filed at Spero Therapeutics, Inc. (SPRO). 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
Spero Therapeutics, Inc. is in the Healthcare sector.