Constantine Macricostas
Analyst
Thank you, Pete, and good morning, everyone. Please turn to Slide 3 in our slide presentation. It was a tough quarter for us on a number of fronts. We captured demand as it increased through the quarter, we improved our cost profile, we grew our high-end business across both FPD and IC and we secured ownership of our leading manufacturing facility in the nanoFab. Sales for the second quarter were $117.5 million. IC sales of $89 million benefited from strong sales in the U.S., led by growth at the high-end. Our high-end grew to 35% of sales, up from 32% in the prior quarter. FPD sales was $28.4 million and were led by increased high-end demand. Because of our vigilant focus of cost control, we delivered incremental growth in operating margins of 83% and 67%, respectively, on the increased revenue. Earnings per share, both GAAP and non-GAAP, were $0.14.
EBITDA was $36 million, up $3 million sequentially. We closed the quarter with a strong balance sheet, with working capital of $221 million. Overall, we're confident of our business model. We're comfortable, and growing at the high-end. We generate good margins and will continue to find ways to improve our profitability.
The dynamics of the photomask industry are changing, and we're in a very good position. In general, the stocks are investing; they're growing at the high-end, as is Photronics. We believe this growth is at the expense of our competition. Photronics were aligned with the largest memory of larger customers in the industry who are investing alongside them.
We are looking to get more data on this, but based on published analyst reports, we believe that we are now the only merchant photomask company that's growing [indiscernible].
Along -- also we believe with IC and FPD combined, we are the strongest photomask merchant in the market today. In the future, we expect the strong will get stronger and we are poised for growth. We have the financial ability to make investments at the high-end. We'll continue to generate good margins. We expect to continue to take market share. So we're quite positive about our business. We're aligned with strong customers. We're making pragmatic investments in high-end capacity, which is a growth engine of photomask business.
Looking forward, we are seeing momentum in our customers' migration to advance nodes. We're qualifying these advanced nodes across both memory and logic. We're diligent of our cost control and disciplined in our approach.
Before I turn the call over to Sean, I would like to thank the entire Photronics global organization for the efforts during the quarter.
And now I will turn the call over to Sean. Sean?