Boston Tech Tidbits: Digital Guardian, MassChallenge, Nara, Quantopian

Lots going on in the Boston tech startup scene this week:

—Accelerator program MassChallenge announced its top 26 startups that are competing for prize money. The awards ceremony is Oct. 29, and Uber CEO Travis Kalanick is keynoting.

Nara Logics has raised $6 million more from .406 Ventures and other investors. The Cambridge, MA, startup, which has raised $13 million to date, has built a restaurant and hotel recommendation tool and also personalization software to help businesses understand their customers.

—Algorithmic trading startup Quantopian has pulled in a $15 million Series B round led by Bessemer Venture Partners.

Digital Guardian (formerly known as Verdasys) has acquired Silicon Valley-based Armor5, a mobile and cloud security software provider. Terms of the deal weren’t disclosed. Digital Guardian is led by CEO Ken Levine, who previously led NitroSecurity, which was bought by McAfee in 2011.

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