What happened Shares of space company Virgin Galactic (NYSE: SPCE) fell as much as 6% in trading on Friday as investors digest some large insider sales this week. The drop didn't last long and at 12:10 p.m. EDT shares were down just 1.4% on the day. So what Last weekend, Virgin Galactic had to abort a test flight after a communication glitch prevented VSS Unity's engine from igniting. That was followed by chairman Chamath Palihapitiya selling 3.8 million shares in order to fund other ventures next year. Image source: Virgin Galactic. Yesterday, Virgin Galactic filed a shelf registration for all of the shares controlled by Richard Branson, Chamath Palihapitiya, Ian Osborne, and Boeing (NYSE: BA), who collectively control the board and own nearly half of Virgin Galactic. In total, the registration is for nearly 113 million shares of stock. Now what One of the fears in owning a growth stock like Virgin Galactic in the long term is that insiders aren't in for the long haul. To be a truly disruptive space company, Virgin Galactic will take a decade or more to mature, and we're still early in that process. So, insiders who control the board of directors selling, or potentially selling, shares is a concern. I don't see this as a good sign, although until Branson, Boeing, and Palihapitiya begin to sell more shares I won't be abandoning a bullish position on this stock. 10 stocks we like better than Virgin Galactic Holdings IncWhen investing geniuses David and Tom Gardner have a stock tip, it can pay to listen. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has tripled the market.* David and Tom just revealed what they believe are the ten best stocks for investors to buy right now... and Virgin Galactic Holdings Inc wasn't one of them! That's right -- they think these 10 stocks are even better buys. See the 10 stocks *Stock Advisor returns as of November 20, 2020 Travis Hoium owns shares of Virgin Galactic Holdings Inc. The Motley Fool owns shares of and recommends Virgin Galactic Holdings Inc. The Motley Fool has a disclosure policy.Source