ADP Buys Tristar, Regroups After Two Execs Leave

VENDOR STRATEGY

ADP has signed a letter of intent to purchase the assets of Montgomery Securities Inc.'s TriStar Market Data Inc., which markets an Apple Computer Inc. Macintosh-based quote system. At the same time, ADP is reorganizing in the wake of departures of vice presidents Ralph Winnicker and Len Hoerst. Winnicker was in charge of sales and marketing, while Hoerst headed up strategic architecture. Winnicker and Hoerst resigned separately, each fleeing the market data vending business. On Jan. 1, Winn

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