RIYADH/LONDON: Saudi Arabia’s Public Investment Fund announced on Thursday it had finalized the acquisition of a 15 percent stake in FGP TopCo, the holding company of Heathrow Airport Holdings. The stake was purchased from Ferrovial SE and other shareholders of FGP TopCo. Simultaneously, Ardian, a private investment firm, acquired a 22.6 percent stake in FGP TopCo through a separate transaction.