“Legal insider trading happens when directors of the company purchase or sell shares, but they disclose their transactions legally.”
Lots of people like to trade based on insider purchases as it usually means things to come but not always. Sometimes insiders behave like any regular person and buy when they get more money or when they think the price is a good price to buy at, and they can be very wrong. In this case though, it is already very oversold and the insider bought around $900k worth! That just spells confidence there and is confirmation that this isn’t some impulsive purchase.
FYI just type in insider trading transactions and find a site that shows the buys and sells. They have to report the transaction publicly within 2 days (I? think). I? sometime watch big purchase over a long period and enjoy seeing many of them do some great things!
Don't get your point. The reason behind filing a form 4 is full disclosure and thereby "legalize" the insider transaction. There is neither a lockup period nor a quiet period and news, if any, could be released at any time.