Shares in Ducommun Inc. closed up 23 percent Tuesday, prompting an inquiry from the New York Stock Exchange into the reason for the activity. The aerospace company said it has a policy of not commenting on unusual market activity.

The exchange asked the Carson-based company to issue a statement indicating whether there were any corporate developments to explain the stock movement.

Trading volume was about 263,000 shares, which is more than twice its 30-day average.

Investment firm BB & T; Capital Markets maintained its buy rating Tuesday after the company reported fourth-quarter earnings Monday, which beat expectations.

Shares closed up 23 percent, or $5.57 per share, Tuesday but were down 3.1 percent to $29.38 in early trading Wednesday on the New York Stock Exchange.