Lots of Charleston tech goings-on lately and coming up. Here’s a sampling:

Eladian: The high-frequency computer-driven stock-trading firm started by a founder and other former executives of Mount Pleasant-based Automated Trading Desk closed last week.

Eladian, which, like ATD, had an office in Charleston, closed Tuesday, according to news reports. Several reports quoted the company spokeswoman citing “market conditions” as the reason, but according to unnamed Dow Jones sources, the trigger was when one of Eladian’s major investors, Technology Crossover Ventures, withdrew funding.

After engineering the $680 million sale of ATD to Citigroup in 2007, Steve Swanson and Peter Kent worked as executives at Citigroup before starting Eladian last year. A College of Charleston graduate who was one of ATD’s first hires, Swanson gave $2.25 million to the college for a scholarship fund this summer.

Benefitfocus: The firm is hosting a career fair at its Daniel Island headquarters Thursday.

The benefits management software company, which recently opened both a San Francisco office and a new floor for its local engineers, is hiring for positions ranging from client or customer service to product development and management.

Interested candidates can go to www.benefitfocus.com/events/career-fair/ to register.

Peggy Frazier: The director of global talent acquisition for Daniel Island-based Blackbaud Inc., has switched to a similar job at Under Armour.

According to her LinkedIn resume, Frazier left Blackbaud to become senior director of talent acquisition at the Baltimore-based performance sportswear company last month.

Frazier, who had previously held human resources jobs at Microsoft, (a former employer of Blackbaud CEO Marc Chardon) just joined the local tech titan last year.

Gatherings: A pair of related tech-centric conferences kick off today at the Charleston Area Convention Center in North Charleston.

The Society for the Advancement of Material and Process Engineering’s four-day conference covers topics ranging from sustainable energy to nanocomposites.

And CompositesWorld’s two-day gathering will focus on new product developments and manufacturing technologies involving composite materials. Among the keynote speakers is Willy Geary, director of the mid-fuselage assembly operation at Boeing 787 Dreamliner complex just up International Boulevard from the conference.

Reach Brendan Kearney at 937-5906 and follow him on Twitter at @kearney_brendan.