Cristina Larkin, Chief Operating Officer at Spero Therapeutics, Inc. (SPRO), sold 12,000 shares at $19.00 ($228K) on 2020-12-16, disclosed to the SEC on 2020-12-18.
Open-market sale of $228k SPRO by Chief Operating Officer. Not flagged as scheduled, tax-driven, or recurring — but no specific bearish signal from our filters. Reasons for insider sales vary widely.
Something here stands out, but not much.
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