SpaceX (NASDAQ:SPCX) shares are set to open above their initial public offering price of $135 per share on Monday, as the stock climbed 4.31% to $139.05 in premarket trading.

Monday’s gains followed a 15.83% bump on Friday, per Benzinga Pro data.

SPCX stock is climbing. See the chart and price action here.

Gary Black Flags SpaceX’s Sharp Swings

SpaceX’s recent moves have drawn attention from investors like Gary Black, who said he remains cautious about the stock’s volatility. On Friday, Black said SpaceX shares surged to $200 before dropping 45% in 60 days.