Western Digital Corp. (WDC) reported its fiscal fourth-quarter results after Wednesday's closing bell, and the numbers looked good on paper. The company beat Wall Street estimates on both the top and bottom lines, but investors weren't impressed, sending the stock lower in extended trading.

Here's a closer look at the details.

Western Digital Q4 Details

Western Digital posted quarterly earnings of $3.56 per share, beating the Street estimate of $3.29 by 7.88%, according to market data. Revenue came in at $3.75 billion, which topped the consensus estimate of $3.69 billion and marked a significant jump from $2.61 billion in the same period last year.

"Fiscal 2026 was an outstanding year for WD, characterized by broadening demand, deeper customer engagement, and disciplined execution across all end markets. As the cloud and other data-intensive workloads continue to expand, we remain confident in the long-term growth trajectory of our business, further margin expansion, and strong free cash flow generation," said Kris Sennesael, CFO of Western Digital.

Looking Ahead

For the first quarter, Western Digital expects adjusted EPS of $3.85 to $4.15, versus the $3.81 estimate, and revenue of $4 billion to $4.2 billion, versus the $4.01 billion analyst estimate.

"For our fiscal first quarter of 2027, at the midpoint of the ranges provided in the table below, we expect revenue of $4.1 billion, non-GAAP gross margin of 55.5%, and non-GAAP EPS of $4," Sennesael said.

Despite the solid beat and upbeat guidance, Western Digital stock was down 8.89% to $473 in Wednesday's extended trading, according to data from market data.