Grayling is handling PR for San Francisco's Lending Club peer-to-peer loan operation that is expected to make a splashy debut on Wall Street today.

The company matches people seeking loans with investors willing to make them, cutting out the banker middle-man from the transaction.

Via yesterday's IPO, LC raised $870M yesterday, giving it a marketing valuation of $5.4B.

The New York Times reports the nascent marketplace loan business will be closely watching LC's stock performance.

A warm reception by investors would encourage other marketplace loan companies to offer shares.

LC is "an amalgam of finance and technology" that has fans in Silicon Valley and Wall Street, according to the NYT.

It boasts a high-profile board of directors that includes Larry Summers (ex-Treasury Secretary), John Mack (former Morgan Stanley CEO) and Mary Meeker (a star Internet analyst and Kleiner Perkins Caufield & Byers venture capital firm partner).

LC CEO Ronald Leplanche launched TripleHop Technologies, which was acquired by Oracle, and served as senior associate at Cleary Gottlieb Steen & Hamilton law firm before setting up LC.

As of Sept 30, LC handled $6.2B in loans that generated $596M in interest for its loan-makers.