Vivian S. Lee, Director at MERRIMACK PHARMACEUTICALS INC (MACK), bought 35,000 shares at $5.50 ($193K) on 2016-02-29, disclosed to the SEC on 2016-02-29.
Open-market purchase of $192k MACK by Director. Below the thresholds we flag for high-conviction alerts (no C-suite role, rare reversal, cluster, or A-grade history). Context: insider career grade C.
Something here stands out, but not much.
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