Shares of Superior Industries International Inc. fell more than 9 percent early Friday after the aluminum wheel maker said that its first-quarter earnings declined because of a large income tax expense.

The Van Nuys company reported net income of $8.1 million (29 cents per share), compared with $8.9 million (33 cents) a year earlier. Expenses rose 8 percent to $6.7 million, including an income tax expense of $3.1 million. That compares to a year-ago tax benefit of $4.2 million.

Revenue increased 26 percent to more than $189 million, driven by 17 percent rise in wheel sales in line with a revival in car and truck production by U.S. automakers.

Analysts surveyed by Thomson Reuters on average had expected per-share profit of 47 cents on revenue of $201 million.

“Market conditions were positive, and the year-over-year increase in our volume shipped was right in line with overall market growth,” Chief Executive Steven Borick

said in a statement. “We kept pace with the market despite taking a full week maintenance shutdown and incurring some weather related disruptions in all our plants.”

Shares were down $2.27, or 9.4 percent, to $21.93 in midday trading on the New York Stock Exchange.