Lumentum

Lumentum just delivered a blowout fiscal Q3, with revenue up 90% year over year to 808 million dollars and gross margins expanding 540 basis points in a single quarter to 47.9%. Operating margins jumped 700 basis points to 32.2%, showing real pricing power and operational leverage. The systems business grew 121% year over year, while components grew 77%, both segments firing at the same time.

Management guided fiscal Q4 revenue to 960 million to 1.01 billion dollars, which would mark the first billion dollar quarter in company history. They also expect operating margins to climb to 35 to 36% with earnings per share of 2.85 to 3.05 dollars. Co-packaged optics and optical circuit switches are just starting to ramp, which the CEO says will drive further earnings power ahead.

The stock has surged on AI optimism and now carries a market value near 71 billion dollars, leaving little margin for error. Any hiccup in hyperscaler spending, a single soft quarter, or competitors closing the technology gap could trigger a sharp drop. Lumentum also just raised over 2 billion dollars in convertible preferred stock, adding 3.2 billion in current debt to the balance sheet.

Gross margins swing widely depending on which products ship. Management openly warned that quarter to quarter product mix shifts can materially impact profitability because margin ranges across the portfolio are so wide. If lower margin systems outpace higher margin components, or if pump laser strength fades, the recent margin gains could reverse quickly. Tariffs and rare earth export restrictions add another layer of uncertainty.