These stocks are among the most active in Friday's extended session.

Regardless of the reason behind it, when a stock makes a large-percentage move, it is often just the start of a new major trend -- a trend that can lead to huge profits.

Insiders at these companies have been scooping up shares of their own stock lately.

Myrexis (Nasdaq:MYRX) has been downgraded by TheStreet Ratings from from a hold to sell.

Myrexis (Nasdaq:MYRX) has been upgraded by TheStreet Ratings from a sell to hold.

Sequoia Capital and Y Combinator have told startups that cutting costs is a priority.

Elon Musk will soon allow Dogecoin to purchase SpaceX merchandise.

The theme park company has opened Guardians of the Galaxy: Cosmic Rewind and not everyone is happy despite the ride getting wonderful reviews.

Aurora is slashing its production capacity as it builds a runway toward positive Ebitda a year from now.