After the U.S. Commerce Department added Huawei Technologies and 70 affiliates to its "Entity List," which bans the Chinese company from acquiring components and technology from U.S. companies without government approval, Benchmark analyst Mark Miller noted that prior restrictions negatively impacted II-VI (IIVI), which counts Huawei among its customers. He also believes Lumentum (LITE) may be unfavorably impacted as Huawei represents about 15% of its revenue. Huawei has contributed about 13% of Micron's (MU) sales in the last two quarters and shares of Western Digital (WDC) often trade in a similar manner to Micron, added Miller. Others that he sees potentially being negatively impacted by the Huawei news include IPG Photonics (IPGP), Coherent (COHR), nLight (LASR) and Veeco (VECO).

Sees Q4 revenue $3.6B-$3.8B, consensus $3.69B.

Reports Q3 GAAP EPS 34c. Reports Q3 revenue $3.46B, consensus $3.36B. "As evidenced by our excellent third quarter results, Western Digital continues improving through-cycle profitability and dampening business cycles by leveraging our strategy of developing a diversified portfolio of industry-leading products across a broad range of end markets," said David Goeckeler, Western Digital CEO. "We are in the early innings of unlocking the full potential of this company, and as industry supply and demand dynamics continue to improve, we will remain disciplined around our capital spending and focused on driving innovation and efficiency across our businesses. We are confident in our strategy and the actions we have taken to-date, which successfully position us to capitalize on the promising growth prospects that lie ahead."

Pre-earnings options volume in Western Digital is 1.4x normal with calls leading puts 7:5. Implied volatility suggests the market is anticipating a move near 6.2%, or $4.32, after results are released. Median move over the past eight quarters is 2.1%.