Seismic, a Del Mar-based sales and marketing enablement startup, is in the midst of what its CEO, Doug Winter, calls a pivotal time for the business.

In the second quarter of 2018 the company's organic year-over-year revenue rose 106 percent, and it recorded 98 percent gross customer retention and 124 percent net customer retention, Seismic said.

The triple-digit percentage increase in revenue came in the same quarter as the company's acquisition of Savo Group, a competitor. The merger brought Seismic's total number of enterprise customers to more than 500 and its headcount to 450, the company said.

In the first half of 2018 Seismic's platform played a role in 11 million sales interactions, 115 percent more than in the previous six months, according to the company.

Seismic has also been widening its geographic footprint. The company expanded its presence in Boston in May, signing a lease for 27,000 square feet of office space in the city's Seaport district. It also opened additional office space in London, and said its headcount there would reach 30 by year's end.

The locally headquartered company is owned by its executive team and investment firms General Atlantic, JMI Equity and Jackson Square Ventures.

Reach reporter Sarah de Crescenzo at sarahd@sdbj.com.