(Bloomberg) -- Bill Gross was warned he would lose his bonus if he quit Pacific Investment Management Co. before the end of the quarter, Pimco said in a court filing, challenging the central claim in his lawsuit against his former employer seeking hundreds of millions of dollars.

"He had no employment agreement, and he acknowledged that leaving Pimco before the end of the third quarter of 2014 would render him ineligible for the profit sharing payments he now claims he is owed," Pimco said in a court filing Monday.

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