Lumentum closed the fourth quarter of fiscal 2026 with strong acceleration. The California-based company, listed on the Nasdaq, recorded revenues of $1,0063 billion, up 24,5% compared to 808,4 million in the previous quarter and 109,3% compared to 480,7 million in the same period of 2025. This is the first time that quarterly revenue has exceeded the billion dollar threshold.
The improvement also concerns operating profitability. GAAP gross margin rose to 47,4% from 44,2% in the third quarter and from 33,3% a year earlier. Non-GAAP gross margin was even higher, reaching 50,4%, compared to 47,9% in the previous quarter and 37,8% in the fourth quarter of 2025.
On the operational front, GAAP margin was 27,8%, versus 21,6% in the previous quarter and an operating loss of 1,7% a year earlier. Non-GAAP operating margin reached 36,6%, up from 32,2% in the third quarter and 15% a year earlier.
Real profit grows, GAAP loss explodes
The most surprising fact of the budget is however the GAAP net loss: $7,16 billion for the quarter, equal to $84,65 per diluted share, compared to a profit of $213,3 million, or $2,96 per share, in the fourth quarter of 2025. However, this is not a collapse in industrial activity. The loss was mainly caused by an extraordinary event: the equity conversion of a portion of the company's convertible securities generated a non-cash loss of $7,76 billion on debt repaymentWithout this accounting effect, the operating picture looks completely different.
Non-GAAP net income was $326,3 million., equal to $3,23 per share, compared to $225,7 million, or $2,37 per share, in the third quarter of 2026 and $63,3 million, or $0,88 per share, a year earlier. Non-GAAP earnings growth compared to the fourth quarter of 2025 is therefore more than 400%.
Components and systems: both activities are accelerating
Growth is not concentrated in a single product area. In the fourth quarter The components generated revenues of 649,4 million of dollars, equal to 64,5% of total revenue. Growth was 21,8% sequentially and 102,7% year-over-year.
Systems growth even faster, which generated revenues of $356,9 million, 35,5% of the total. This represents a 29,7% increase compared to the third quarter and a 122,6% increase compared to the previous year. These figures are particularly significant because they confirm that demand for optical data center infrastructure is not simply increasing: it is contributing to a rapid shift in the company's economic scale.
The balance sheet for the entire financial year
The leap is even more evident when looking at the entire fiscal year. Lumentum generated $3,014 billion in revenue in 2026, versus $1,645 billion in 2025: an increase of 83,2%.Margins also showed very strong growth. GAAP gross margin increased from 28% to 41,7%, while non-GAAP gross margin rose from 34,7% to 46%. GAAP operating margin increased from -10,9% to +17,4%, while non-GAAP operating margin increased from 9,7% to 29,8%.
The non-GAAP result, much more representative of the operating performance, tells of Earnings of $782,3 million, or $8,67 per share, compared to $146,4 million and $2,06 per share in the previous fiscal year. The increase in non-GAAP earnings is therefore more than 430%.
What Lumentum Really Sells
To understand why Lumentum has suddenly become so important, you need to look inside an AI data center. Processors are the heart of the system, but they must constantly exchange enormous amounts of data. At certain speeds, using only electrical connections becomes increasingly difficult in terms of bandwidth, distance, and energy consumption. Here photonics comes into play: light becomes the medium through which data is transferred.
Lumentum produces some of the elements that make this communication possible: lasers, optical components, modules and systems used in very high-speed networks. It is therefore a company that does not directly produce the large AI accelerators, but sells part of the infrastructure which allows thousands of these accelerators to work together. And it's precisely this position in the technology chain that makes the Lumentum case particularly interesting.
Is it unique? No, but the location is special.
Lumentum is not a monopolist. The sector includes major competitors such as Coherent, Applied Optoelectronics, Ciena and other specialized manufacturers of optical components and systems. Coherent, in particular, is a major direct competitor and has also benefited greatly from the explosion in AI-related demand.
Lumentum's difference, however, lies in the combination of skills: lasers, photonics components, advanced manufacturing, and networking technologies. Additionally, the company is increasingly exposed to technologies considered strategic for the next generation of data centers, including co-packaged optics (CPO) and optical circuit switching.
The turning point came on March 2, 2026, when Nvidia announced a strategic partnership with Lumentum and a $2 billion investmentThe goal is to accelerate the development of optical technologies for future AI data centers and enable Lumentum to increase production capacity and research. This isn't just a customer-supplier relationship: it's a sign that optical technology has become a strategic component of the NVIDIA ecosystem.
The title: a record performance
The industrial transformation has been dramatically reflected on the stock market. Since the beginning of the year, Lumentum shares have more than doubled in value on the Nasdaq. At the close of business on August 11, 2026, Lumentum was worth $817 per share, while at the close of business on December 31, 2025, it was worth $368,59: this means a YTD gain of +121,7%.
And Lumentum isn't even the only star in photonics. In July, after a sharp correction in the sector, Lumentum was still at around +98% YTD, against approximately +80% for Coherent and +233% for Applied OptoelectronicsMeanwhile, Applied has continued to run strong: as of August 7, its YTD return was nearly +289%. This paints a picture of an entire segment that Wall Street considers one of the main beneficiaries of the second phase of the AI boom. Lumentum, however, has become one of the companies most representative of this trend.
