Wesco Aircraft Holding Inc. has named Todd Renehan as its new chief executive and Alex Murray as the new president.

Renehan and Murray replace David J. Castagnola who had held both titles for the Valencia aerospace parts supplier. Castagnola has retired from the company, including his seat on the board.

Renehan joined Wesco as executive vice president and chief commercial officer following the acquisition of Haas Group International, in West Chester, Pa., three years ago. Renehan had been president of Haas Group.

“I am confident we will continue to make progress toward realizing our growth and profitability goals while building on our solid platform to offer an even more compelling value proposition with superior customer service,” Renehan said in a prepared statement.

Murray has been with Wesco since 2000, most recently as executive vice president and chief operations officer.

The change in executive leaders was announced Friday. Shares closed down on Monday at $2.22, or more than 18 percent, to $9.93.