The following is a guest editorial courtesy of Carolane de Palmas, Markets Analyst at Retail FX and CFDs broker ActivTrades.

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Lumentum Holdings emerged as one of the standout performers among the shares most traded by ActivTrades clients in August. After 3 bearish months, gaining 28.12% over the month as investors continued to search for companies positioned to benefit from the rapid expansion of artificial intelligence infrastructure. August marked its best monthly performance since February where it gained more than 78%.

Monthly LITE Chart – Source: TradingView

The optical technology specialist was part of the Top 5 most traded shares on ActivTrader during August, alongside some of the market’s most closely followed AI and technology names. Palantir Technologies led the monthly gains with a 51.45% advance, followed by SpaceX, which jumped 32.52%. Micron Technology gained 16.30%, while Nvidia advanced 9.82%.

Lumentum’s performance stands out because the company is less familiar to many investors than other big names like Nvidia, yet it sits at an increasingly important point in the AI infrastructure chain: the technology that allows enormous amounts of data to move between processors and across data centres at high speed.

The question now is whether its strong August performance can continue into September—or whether the rapid rally has already priced in much of the company’s AI opportunity.

Lumentum: Betting on the optical side of the AI boom

Lumentum develops optical and photonic technologies, including lasers, optical components, modules and systems used in communications and data-centre infrastructure. That positioning has become increasingly attractive as AI workloads grow more demanding.

The AI investment cycle initially focused heavily on computing power, particularly GPUs. Nvidia became the clearest beneficiary as hyperscalers and technology companies raced to build increasingly powerful AI data centres. But building larger AI clusters creates another problem: moving data between thousands of processors quickly enough to prevent networking from becoming a bottleneck.

This is where optical connectivity becomes increasingly important.

Lumentum says its technologies enable high-speed, energy-efficient connectivity for AI infrastructure and cloud computing. The company is also developing solutions for emerging architectures such as co-packaged optics and optical circuit switching, which could become increasingly important as data-centre architectures evolve.

This gives Lumentum exposure to a different part of the AI investment cycle. Instead of selling the processors that perform AI calculations, it provides some of the technology required to connect those processors.

That distinction could become increasingly important as the industry moves from simply adding computing capacity towards solving the networking and energy-efficiency challenges associated with massive AI clusters.

Recent industry developments support this thesis. Demand for optical connectivity is increasing as AI data centres require greater bandwidth, while supply constraints are creating additional pricing power for some optical component suppliers.

Growth potential is moving beyond the traditional AI trade

The company’s management has highlighted optical circuit switches and co-packaged optics as substantial longer-term opportunities. Its second-quarter results already pointed to strong demand, while the company said it was only at the beginning of these opportunities.

The broader market opportunity is also expanding as AI infrastructure spending moves beyond GPUs. Hyperscalers are investing billions of dollars in new data centres, while networking equipment and optical technologies are becoming critical components of these facilities. U.S. data-centre construction spending accelerated sharply in July according to data from the U.S. Census Bureau and FactSet, illustrating the scale of infrastructure investment supporting the AI ecosystem.

This creates an important potential growth multiplier for Lumentum. If AI models continue becoming larger and more computationally intensive, data centres will need to move more information between chips. That can increase demand for faster optical connections even if the underlying AI applications change. In other words, Lumentum is increasingly positioned as an AI infrastructure enabler rather than a direct AI application company.

That can be attractive for investors because its growth does not depend on successfully developing a chatbot, AI model or software platform. Instead, it benefits from the physical infrastructure required to make the AI ecosystem work.

Latest earnings show the strength of the cycle

Lumentum’s latest results provide considerable support for the bullish investment thesis.

For its fiscal fourth quarter ended June 27, 2026, the company reported revenue of $1.006 billion, up 109.3% year over year and 24.5% from the previous quarter. Non-GAAP operating margin increased to 36.6%, compared with 15% a year earlier.

The full fiscal year was equally impressive: revenue reached $3.014 billion, an 83.2% increase from $1.645 billion the previous year. Non-GAAP net income surged to $782.3 million, compared with $146.4 million in fiscal 2025.

The company’s guidance also suggested that momentum could continue, as Lumentum expects fiscal first-quarter 2027 revenue of between $1.225 billion and $1.275 billion, with a non-GAAP operating margin of 39.5%-40.5%.

The numbers indicate that the AI infrastructure boom is already translating into substantial revenue and earnings growth rather than remaining simply an investment narrative. However, expectations are now significantly higher.

When a stock rallies as aggressively as Lumentum has (+128% since January), investors increasingly demand that subsequent earnings reports demonstrate that growth is sustainable. Any indication of weaker orders, supply constraints, margin pressure or slower AI infrastructure spending could therefore trigger an outsized market reaction.

Lumentum’s August share-price action

That brings the story back to the stock itself. Lumentum gained 28.12% in August, making it one of the strongest performers among the shares most traded by ActivTrades clients during the month. The move was particularly notable because it followed an already exceptional long-term rally of more than 489% over one year (even though the last 3 months were mostly down after reaching a new all-time high in May above $1,085).

The latest earnings report provided an additional catalyst. Revenue more than doubled year over year, profitability improved sharply and management provided strong guidance for the following quarter.

The stock’s trajectory also illustrates an important characteristic of AI-related shares: fundamentals and momentum can reinforce each other—but they can also reverse quickly.

As expectations rise, investors can become increasingly sensitive to even small disappointments. Lumentum therefore offers both a structural growth story and a potentially volatile trading opportunity.

Nedko Geshev, Chief Communications Officer at ActivTrades:

“Lumentum’s exposure to the rapidly expanding optical infrastructure required by AI data centres gives the company significant growth potential, particularly as demand shifts from computing capacity towards faster and more efficient connectivity. However, the sharp appreciation in the shares also highlights the volatility associated with AI infrastructure stocks. For traders, these large price swings can create short-term market opportunities through CFDs, although they also increase risk and require disciplined risk management.”

Can Lumentum remain a September favourite?

Lumentum enters September with a compelling combination of strong earnings growth, exposure to a structural AI investment trend and expanding opportunities in optical networking.

Its latest quarter showed just how rapidly the business is growing, while the company’s guidance suggests that the momentum has not yet peaked. But the investment case is no longer undiscovered.

After such a powerful share-price rally, the market will increasingly ask whether earnings can continue growing fast enough to justify elevated expectations. That makes upcoming company guidance, AI capital expenditure plans from hyperscalers and developments in optical networking particularly important for the stock.

For ActivTrades clients, Lumentum’s appearance among August’s most traded shares for the first time in months also highlights how quickly investor interest can move beyond the traditional AI leaders.

Nvidia remains central to the AI hardware story. Micron provides exposure to the memory required by increasingly powerful AI systems. Palantir represents the software and data side of the theme. Lumentum offers something different: exposure to the infrastructure required to connect the AI ecosystem together.

That could keep the stock firmly on traders’ radar in September. The challenge is that the same characteristics that make Lumentum attractive—rapid growth, strong AI exposure and significant investor expectations—can also make it particularly sensitive to earnings surprises and shifts in market sentiment.

Sources: FactSet, Reuters, Lumentum Investor Relations, Yahoo Finance, CNBC, Investopedia

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