// company-profile
Spero Therapeutics, Inc. Insider Trading
SPROEvery SEC Form 4 insider trading filing for Spero Therapeutics, Inc. (SPRO) — open-market buys and sells by directors and officers, option exercises, and cluster activity, updated as each filing is reported to the SEC.
curl "https://api.form4api.com/v1/transactions?ticker=SPRO" -H "X-Api-Key: YOUR_API_KEY"// activity-summary
Recent insider activity is bullish. Over the last 30 days, 2 insiders purchased shares. Buying was led by Zack Debra.
// 90-day insight
Over the last 90 days, Spero Therapeutics, Inc. insiders bought $0 across 16 transactions with no open-market sales.
- Most active insider: Zack Debra with 2 transactions totaling $0.
Activity skews bullish — buys outpace sales.
Institutional Ownership
Top 13F-HR holders of Spero Therapeutics, Inc. as of 2026-06-30
Data source: quarterly 13F-HR filings — institutional holders report positions within 45 days of quarter end. Joined with insider activity above — see who's loading up institutionally while insiders are trading. Full 13F-HR API →
Insider Transactions
Sourced from SEC EDGAR Form 4 filings. Updated hourly.
| Date | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 3, 2026 | Zack Debra | SPRO | Award | 162,311 | $0.00 | $0K |
| Aug 3, 2026 | Zack Debra | SPRO | Award | 324,675 | $0.00 | $0K |
| Jun 23, 2026 | Deshpande Milind | SPRO | Award | 10,000 | $0.00 | $0K |
| Jun 23, 2026 | Tregoning Kathleen | SPRO | Award | 20,000 | $0.00 | $0K |
| Jun 23, 2026 | Tregoning Kathleen | SPRO | Award | 10,000 | $0.00 | $0K |
45 more transactions hidden
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