Actor Patrick Stewart joined Twitter Chief Executive Dick Costolo and founder Jack Dorsey at the New York Stock Exchange this morning, to ring in the social media platform’s IPO.

Twitter announced yesterday via tweet that the price per share of its initial public offering had been set at $26, with an $18 billion valuation. The shares had been priced above a previous range of $23 and $25.

Honored to join @ev @jack @biz @dickc & the @Twitter team at their historic IPO this morning. #Ring! pic.twitter.com/XaJpYW2kIh

— Patrick Stewart (@SirPatStew) November 7, 2013

Also on hand were 9-year-old lemonade stand owner Vivienne Harr, and a representative from the Boston Police Department. Harr established her “Make a Stand” movement, after seeing a photograph of two enslaved boys. She’d stood by her lemonade stand for 365 days, which ignited a crusade to end child slavery.

“I guess I represent the poster boy for Twitter,” Stewart said, adding that he’d only been tweeting for about a year and wasn’t buying any Twitter stock.

Stewart had been in the news of late after marrying longtime girlfriend Sunny Ozell, a singer-songwriter. The ceremony was officiated by Sir Ian McKellen, a close friend of the actor.

Coney Souvenir! #gogodididonyc @TwoPlaysInRep pic.twitter.com/0YUN89b1tV

— Patrick Stewart (@SirPatStew) October 2, 2013

One of Stewart’s best-known roles is Captain Jean-Luc Picard, on the series “Star Trek: the Next Generation,” which ran from 1987-1994.

pic.twitter.com/3HarOgEm2z

— Patrick Stewart (@SirPatStew) June 11, 2013

Incidentally, Picard kept a Lionfish named “Livingston” in his ready room fish tank, the same kind of fish that is presently tearing up the Atlantic.

As of writing, Twitter stock is sitting at around $45 per share, up about 73%.

Image via Twitter.