The Stanhope Entrepreneurs Fund, a growth capital fund managed by Stanhope Capital, the global investment and advisory group, has completed its first investment.

The SEF is the lead investor in a c.$90 million equity raise into S4 Capital plc (“S4”), the new era digital advertising and marketing services company established by Sir Martin Sorrell earlier this year. The capital was raised by S4 to fund the acquisition of MightyHive for a total consideration of $150 million.

MightyHive is the San Francisco-based market-leading programmatic solutions provider for forward-thinking marketers and agencies. This transaction follows S4’s acquisition of MediaMonks in July and furthers the company’s strategy of combining award winning creative production with digital media planning and buying and first party data. As part of the transaction, Stanhope Capital’s founder and CEO Daniel Pinto will join the Board of S4.