Twitter’s stock was soaring for the second day in a row Tuesday, jumping 4 percent, to close at $18.24 a share — now that billionaire investor Mark Cuban says he has snapped up shares.

It follows an even bigger jump of nearly 7 percent on Monday after ex-Mayor Mike Bloomberg and Twitter founder and CEO Jack Dorsey revealed a new joint 24/7 video news channel to be unveiled in the fall.

Speaking on CNBC’s “Squawk Alley” Tuesday, Cuban said, “My biggest holdings are Amazon, which I think is the leader in the space, and Netflix for video, and I started buying Twitter recently because I think they finally got their act together on artificial intelligence.”

After the market closed Monday, Twitter unveiled more plans, including teaming up with Derek Jeter’s Players’ Tribune on sports news.