Businessweek is reporting that “secretive” data-analysis company Palantir is raising another $100-million-plus round of funding (which would put it above $700 million total) at a $9 billion valuation. This comes just several weeks after the company raised $196 million in capital at what Businessweek claims was a $6 billion valuation. That’s a lot of money, but Palantir’s business — and real estate investments — require it.

I say “secretive,” because although there is an aura of mystery around the company, its customer base — most notably a goodly number of intelligence, law enforcement and banking institutions — is probably among its biggest secrets. CEO Alex Karp was the subject of an in-depth profile in Forbes earlier this year, and has been interviewed on television by Charlie Rose. The company is an omnipresent figure in Palo Alto, too, buying up building after building downtown, some staffed with their own roving…