(Reuters) – TechTarget on Wednesday agreed to combine with London-based events organizer Informa’s digital businesses in a deal to expand its portfolio and diversify revenue streams, the companies said on Wednesday. Informa will contribute its Informa Tech digital businesses and $350 million in exchange for a 57% stake in the combined company, while TechTarget shareholders will get $11.79 per share and retain the rest of the stake, the statement said. “The combination brings scale benefits, diversified revenue streams and strategic expansion opportunities by expanding TechTarget’s current addr…