IC packagers Advanced Semiconductor Engineering (ASE) and Siliconware Precision Industries (SPIL) both saw their monthly revenues rebound to a sequential growth track in March 2013.

ASE has announced consolidated revenues of NT$17.15 billion (US$579 million) for March 2013, up 18.8% sequentially. Sales for the first quarter came to NT$48.19 billion, slipping 14% on quarter, however.

Compared to a year earlier, ASE's consolidated sales for March and first-quarter 2013 showed growth of 11.6% and 11.8%, respectively.

Excluding sales generated by EMS subsidiary Universal Scientific Industrial (USI), ASE saw March sales of its core ATM (assembly test and material) business increase 17.6% sequentially and 8.8% from a year ago to NT$11.32 billion. Core operations generated revenues of NT$31.32 billion in the first quarter of 2013, up 7.1% on year but down 8.9% on quarter.

ASE guided previously that its core business would post a shipment decrease of 10-13% sequentially in the first quarter of 2013, with gross margin falling 4-5pp due to lower utilization rates. The firm did not provide a revenue guidance.

SPIL has disclosed that consolidated revenues for March 2013 grew 16.8% sequentially to NT$4.97 billion. Sales for the first quarter amounted to NT$13.82 billion, down 14.4%, however.

SPIL's sales for March and first-quarter 2013 represented decreases of 10.3% and 8.6%, respectively, from a year earlier.

SPIL chairman Bough Lin remarked at a company investors meeting at the end of January that the firm would see its sales start picking up in March, and rebound through the second half of 2013. Lin is expected to update the company's business outlook for the latter half of the year at an upcoming investors meeting scheduled for April 30.