Why insider trading matters?

When insiders buy shares on the open market, this can thus be regarded as a strong endorsement by those that know the company the best -- they are literally betting their own money on the company's future. Insider selling, however, is not necessarily meaningful in any way, as there is a range of reasons for insiders to liquidate (some) of the shares they own.

- Seeking Alpha
AMETEK INC/ (AME)
Sector: Industrials; Industry: Specialty Industrial Machinery

AMETEK, Inc. manufactures and sells electronic instruments and electromechanical devices worldwide. The company's EIG segment offers advanced instruments for the process, aerospace, power, and industrial markets; process and analytical instruments for the oil and gas, petrochemical, pharmaceutical, semiconductor, automation, and food and beverage industries; and instruments to the laboratory equipment, ultra-precision manufacturing, medical, and test and measurement markets. This segment also operates a network of aviation maintenance, repair, and overhaul facilities.


Insider Smart

Altimmune, Inc. (ALT) - Venrock Healthcare Capital Partners III, L.P., 10%-owner of ALT bought 1.3M shares in late May then added another 1.5M shares in June with an averaged ~$8 per share. 10 days after the accumulation, ALT price jumped to $10.

Insider Smart

PENN NATIONAL GAMING INC (PENN) - PENN took a deep dive from $36 to $5 due to the crash, anyone who was bold enough to pick up some shares in March or April could have made a 900% profit in 2 months. But bottom fishing is always easier said than done, if one took a safer bet and followed multiple insider buying around $18, a 100% profit is still impressive.