Yutani knew of the Prometheus Mission

Ingeniero
MemberPraetorianFebruary 28, 2017The Heliades made possible Weyland Industries' expansion throughout the stars beginning in 2034. The FTL-capable (faster than light) Prometheus was the culmination of thirty eight years of development. Yutani Corporation knew of the Prometheus mission because of the Weyland Industries Press Release. In addition to, at the very least, an intercepted communication from Dr. Shaw to Weyland. (Thank you ninXeno426)
The Prometheus mission, with it's more than a trillion dollar cost, was a significant financial bet for the company, see below.
Weyland astronomers were searching space for signatures of precious metals when they made the discovery of Acheron LV-426 in 2039. The classified destination project of Prometheus was a Weyland Corporation, Government, and Private investment vehicle.
Yutani Corporation, with vast financial and technical resources, had it's own astronomers and androids and could have contributed to another voyage to the same system hosting LV-426 in the past.
Yutani Corporation was acquired (Yutani was "absorbed" into Weyland Corporation in 2099, no hostile takeover, Thank you S.M) by Weyland Industries.