Stewart K.P. Gross joined private equity firm Lightyear Capital as a...

Stewart K.P. Gross joined private equity firm Lightyear Capital as a managing director and member of its investment committee. It is a new position. Mr. Gross was managing director and member of the executive management group at Warburg Pincus. Kenny Juarez, Warburg Pincus spokesman, did not return calls by press time to comment on a replacement.

Paul Aaronson joined hedge fund index investment manager PlusFunds Group as CEO, said Meir Kahtan, spokesman. He will replace Gabriel Bousbib, who resigned as president and CEO in December to pursue other interests. Mr. Aaronson was executive managing director of the portfolio services group at Standard & Poor's, which includes S&P's index services and portfolio advisory business. David Guarino, S&P spokesman, said the firm has not yet filled Mr. Aaronson's position.

correction appended