(Updates with stock move in the headline, first paragraph.)

Westlake (WLK) shares were up about 13% in Tuesday trading following better-than-expected Q2 results.

Earlier, the company posted quarterly earnings of $2.01 per diluted share, swinging from a loss of $1.11 a year earlier.

Analysts polled by FactSet expected $1.71.

Revenue for the quarter ended June 30 was $3.27 billion, up from $2.95 billion a year earlier.

Analysts expected $3.24 billion.

Price: 79.00, Change: +9.11, Percent Change: +13.03