After a $110 million Series D fundraising round led by Sequoia Capital, the password management and internet security firm Dashlane decided to expand at the Flatiron District building where it had just leased a full floor.

In April, the global digital identity tech company rented the fourth floor of 16,625 square feet at 44 W. 18th St., which is located between Fifth and Sixth avenues. It has now added the entire third floor of the same size to total 33,250 square feet.

After a custom buildout, it just moved from nearby 156 Fifth Ave., between West 20th and 21st streets.

Marc Shapses, Seth Wasserman and Roi Shleifer of Savills represented the tenant in the latest transactions, which include a custom buildout.

James Buslik and Alan Bonett of Adams & Co. represented the ownership, which had an asking rent of $76 per square foot.

Founded in France by CEO Emmanuel Schalit, Dashlane has offices here as well as in Paris and Lisbon — and like all local tech companies, has a variety of job openings.

The firm started out in the Big Apple in a barebones office in Soho at 73 Spring St., where employees communicated with their Parisian colleagues through early video and a rolling iPad robot.