Coherent Corp. (COHR) reported fiscal Q4 2026 revenues of $2.05B, up 34% year-over-year, with Datacenter & Communications segment surging 59% and representing 79% of total revenue. The company guided Q1 2027 revenues of $2.2-$2.4B with adjusted operating margins improving to 21.8%. However, Industrial revenues declined 16% YoY, creating concentration risk in datacenter spending.

Vincent Retort, VP of global reliability and quality at Lumentum Holdings, sold 12,566 shares worth $10.7 million on August 19-20. The majority (10,083 shares) were withheld for tax obligations related to restricted stock unit vesting, while 2,483 shares were sold under a pre-arranged trading plan. Despite the sale, Retort retains 102,000 shares valued at $88.34 million. The transaction occurred as Lumentum recorded a 638% one-year return, with the company maintaining strong gross margins of 50.4% and focusing on expanding manufacturing capacity.

Wupen Yuen, president of global business units at Lumentum Holdings, disposed of 12,565 shares totaling $10.7 million on August 19-20. The majority (84%) consisted of shares withheld for tax obligations from restricted stock vesting, while 2,000 shares were sold under a pre-planned Rule 10b5-1 trading plan filed in May. Despite the sales, Yuen maintains a significant 93,229-share position. The transaction occurs as Lumentum reports strong growth with components revenue up 103% and total revenue up 109% year-over-year, driven by demand for near-packaged optics technology for AI applications.

Lumentum's CFO Ali Wajid sold 10,728 shares worth $9.1 million on August 19-21 to satisfy tax withholding obligations from vesting equity awards, reducing his direct holdings by 13%. Despite the paper loss from convertible bond conversions, the company's underlying business showed strong performance with revenue up 109% year-over-year and operating margins improving to 36.6%.

Lumentum CEO Michael Hurlston sold 6,185 shares worth $5.1 million on August 19 to cover tax withholding obligations from restricted stock unit vesting. This was a non-discretionary transaction and does not reflect his view on the stock. Hurlston retains 112,794 shares valued at $93.35 million. The stock has delivered a 602% one-year return, and the company is guiding for $1.25 billion in September quarter revenue with 39.5-40.5% margins, hitting its target model early amid strong demand for optical and photonic products.

Lumentum and Coherent, which supply optical components for AI data centers, fell sharply on Tuesday amid broader AI stock selloff concerns about demand sustainability. However, both companies recently reported strong earnings with record revenues and robust guidance, suggesting demand actually exceeds their supply capacity. The article argues both stocks appear attractive at these marked-down prices.

Optical networking components are emerging as the next critical bottleneck in AI data center infrastructure. Lumentum Holdings, a leading optical and photonics supplier, is experiencing exceptional growth with revenue up 109% YoY and adjusted EPS up 3.7x. The company projects even stronger growth ahead, with the optical networking market expected to reach $154 billion by 2028. Despite a 140% gain in 2026, analysts project potential upside of 113% over the next three years based on favorable supply-demand dynamics.

As AI innovation accelerates, data centers are shifting from copper wiring to optical connections for faster, more energy-efficient connectivity. This shift is creating a bottleneck in AI infrastructure, presenting investment opportunities in eight optical technology companies across chip design, laser manufacturing, transceiver infrastructure, and data routing systems.

Nvidia stock has gained only 5% in 2026 amid a broader rotation out of large-cap tech stocks. However, the company shows strong fundamentals with record data center revenues, $1 trillion in revenue visibility for new processors, and strategic positioning across the AI infrastructure stack. The author argues that valuation compression reflects investor caution rather than deteriorating business fundamentals, and expects a rerating higher as operational results confirm continued AI-driven growth.

The article compares two iShares small-cap growth ETFs: IWO (Russell 2000 Growth) and ISCG (Morningstar Small-Cap Growth). While ISCG offers a lower expense ratio (0.06% vs 0.24%) and higher dividend yield, IWO has demonstrated superior performance across most timeframes with 41.2% 1-year returns versus 33% for ISCG. The analysis recommends IWO for investors prioritizing performance over cost savings.

U.S. stocks declined sharply on Tuesday as investors rotated out of high-flying chip and AI stocks. The Nasdaq 100 fell 3.3%, the S&P 500 dropped 1.6%, and the Russell 2000 fell 1.3%. Oil prices collapsed 6% following a halt in Israel-Iran strikes. Markets are now pricing in a potential Fed rate hike by October rather than cuts, pressuring richly valued tech stocks. Semiconductor and optical companies led losses, while defensive and financial sectors provided some cushion.

Silicon photonics is emerging as the next critical bottleneck in AI infrastructure after high-bandwidth memory. Lumentum Holdings, backed by Nvidia's $2 billion investment and a multibillion-dollar purchase commitment, is positioned to lead this market. The company's new North Carolina manufacturing facility for optical devices is expected to ramp production by mid-2028, potentially driving another 100% stock surge despite already gaining 1,110% over the past year.