A company that created an app that lets you text 911 operators is moving into larger quarters in Midtown South.

Fueled by everyday home and automobile accidents as well as terrorist activities such as this past weekend’s Chelsea bombings and Minnesota knife rampage, the fast-growing tech firm RapidSOS has signed a deal for 8,257 square feet representing the entire ninth floor at 234 W. 39th St.

The company currently subleases smaller space nearby on Seventh Avenue.

Christine Colley and Conor Kenny of Cushman & Wakefield represented RapidSOS in the lease negotiations.

The Savitt Partners team of Robert Savitt, Brian Neugeboren, Elliot Zelinger and Nicole Goetz represented building owner Waterman Interests. The deal had an asking rent of $53 per square foot.

RapidSOS was founded by MIT, Harvard and Stanford grad students. In 2013, they obtained $5 million from Highland Capital Partners. Another $5 million was raised from the Westly Group, Responder Ventures and two former FCC chairmen this year as the company launched its first app, Haven.

Along with allowing texting and sending your exact geolocation to 911, Haven can provide details of your situation to family members who can also correspond with 911 operators.

The company charges $29 to $49 per year and is now building its user base through partnerships with universities, corporations, and groups that support people with disabilities.