 |  | Ackman targets retail investors in ADP proxy contest |  | BOSTON (Reuters) - Billionaire hedge fund manager William Ackman, whose firm owns an 8.3 percent stake in Automatic Data Processing Inc , is turning up the heat in his proxy war for the human resources outsourcing company by targeting an often-ignored but influential group of people - retail investors. | |  | |  |  | |  |  | Related Video | |  | |  | |  |  |  | Related News | |  | |  | |  |  |  |  |  | Counterparties is a curated snapshot of the best finance news and commentary around the web. Register Today |  | |  |  |  | A daily digest of breaking business news, coverage of the US economy, major corporate news and the financial markets. Register Today |  | |  | » » MORE NEWSLETTERS |  | |