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High-Frequency Traders Lobby, Donate to Head Off U.S. Rules

The high-frequency trading industry is stepping out of the shadows in Washington.

Closely held companies with undisclosed profits and obscure names like Getco LLC, Hard Eight Futures LLC and Quantlab Financial LLC, are beginning to act more like Wall Street banks, cutting checks to politicians, forming trade groups and hiring lobbyists and ex-regulators. They’re looking to fend off tighter rules and appease lawmakers who say the firms disadvantage small investors and contribute to wild swings in stock prices.