MERRIMACK PHARMACEUTICALS INC (MACK) is a publicly traded company in the Unknown sector. Across all available filings, 36 corporate insiders have executed 538 transactions totaling $44.9M, demonstrating a bullish sentiment with $13.1M in net insider flow. The most recent transaction on Dec 28, 2023 involved a purchase of 857 shares valued at $11.4K.
No significant insider buying has been recorded for MACK in the recent period.
No significant insider selling has been recorded for MACK in the recent period.
Based on recent SEC filings, insider sentiment for MACK is bullish with an Insider Alignment Score of 65/100 and a net flow of $13.1M. Insiders are accumulating shares, which historically signals confidence in the company's future performance.
Insider trading at MERRIMACK PHARMACEUTICALS INC (MACK) refers to stock transactions made by corporate insiders—executives, directors, and beneficial owners holding more than 10% of the company's shares. These individuals have access to material non-public information and are required by law to report their trades to the SEC within two business days. Currently, 36 insiders are actively trading MACK stock, having executed 538 transactions in the past 90 days. The most active insider is Robert J. Mulroy (Executive), who has made 34 transactions totaling $7.8M.
Get notified when executives and directors at MACK file new Form 4 transactions
Date | Insider | Title | Type | Shares | Price | Value | Flags |
|---|---|---|---|---|---|---|---|
| Dec 28, 2023 | Andersen Eric | Executive | Purchase | 857 | $13.35 | $11.4K | |
| Dec 26, 2023 | Andersen Eric | Executive | Purchase | 48,693 | $13.15 | $640.3K | Large |
| Dec 7, 2023 | Andersen Eric | Executive | Purchase | 24,666 | $12.85 | $317.0K | |
| Dec 7, 2023 | Andersen Eric | Executive | Purchase | 76,384 | $12.85 | $981.5K | Large |
| Nov 17, 2023 | Partners Lp Western Standard | Executive | Purchase | 65 | $12.50 | $813 | |
| Nov 17, 2023 | Partners Lp Western Standard | Executive | Purchase | 235 | $12.50 | $2.9K | |
| Nov 14, 2023 | Partners Lp Western Standard | Executive | Purchase | 39,283 | $12.50 | $491.0K | |
| Nov 14, 2023 | Partners Lp Western Standard | Executive | Purchase | 10,887 | $12.50 | $136.1K | |
| Nov 13, 2023 | Andersen Eric | Executive | Purchase | 12,191 | $12.39 | $151.0K | |
| Nov 13, 2023 | Andersen Eric | Executive | Purchase | 3,379 | $12.39 | $41.9K | |
| Nov 10, 2023 | Andersen Eric | Executive | Purchase | 29,803 | $12.32 | $367.2K | |
| Nov 10, 2023 | Andersen Eric | Executive | Purchase | 8,259 | $12.32 | $101.8K | |
| Nov 9, 2023 | Llc Western Standard | Executive | Purchase | 2,165 | $12.19 | $26.4K | |
| Nov 9, 2023 | Llc Western Standard | Executive | Purchase | 7,810 | $12.19 | $95.2K | |
| Nov 8, 2023 | Llc Western Standard | Executive | Purchase | 4,783 | $12.13 | $58.0K |
| TYPE | COUNT | VALUE | % |
|---|---|---|---|
Purchase(P) | 272 | $29.0M | 56.8% |
Sale(S) | 74 | $15.9M | 31.2% |
Exercise(M) | 120 | $6.1M | 12.0% |
Gift(G) | 14 | $0 | 0.0% |
Will Acquisition(W) | 4 | $0 | 0.0% |
Conversion(C) | 54 | $0 | 0.0% |
Insiders at MERRIMACK PHARMACEUTICALS INC are accumulating shares at an accelerated pace. With 36 insiders making 538 transactions totaling $29.0M in purchases versus $15.9M in sales, the net buying activity of $13.1M signals strong executive confidence. Robert J. Mulroy (Executive) leads the buying activity with $7.8M in transactions across all time.