Littelfuse, Inc. (LFUS) | The Buildout — AI Infrastructure

The Verdict

Littelfuse makes components that protect, switch and manage electrical current: fuses, circuit breakers, relays, sensors, protection semiconductors and power semiconductors. In the AI buildout it sits between the utility and the compute — management calls the position grid-to-chip and says all three of its segments sell into data centers, from passive fuses and protection semiconductors to high-power fuses in Industrial and circuit breakers in Transportation. It is a components supplier, not a system vendor, and management describes itself as a diversified industrial rather than an AI company.

Earnings Beat

Littelfuse reported Q2 2026 net sales of $739M, up 20% year over year and 14% organically, with Basler contributing about 6% and FX a 1% tailwind. Gross margin on the audited basis was 41.4%, up from 38.7% in Q1. Management said bookings set a company-wide record and book-to-bill was well north of 1.0; adjusted diluted EPS was $4.19, up 47%.

Management tone: Between the Q1 and Q2 2026 calls the language shifted from emerging signs and improving demand to broad-based momentum and a company-wide bookings record. On the Q2 call management described a faster-than-expected HVAC recovery, said channel inventory was normal in terms of weeks, and concluded that this is real end demand across our markets. It gave timing but no figure for the Allen closure savings, and steered a direct question on data-center mix toward breadth and growth rate rather than a number.

Management Guidance

Management guided Q3 2026 net sales to $780–800M — 26% growth at the midpoint, including 21% organic growth, a 6% contribution from Basler and a 1% FX headwind — and adjusted diluted EPS to $4.85–5.05, roughly 68% growth at the midpoint, with an adjusted effective tax rate of 23–24%. It raised its full-year 2026 Basler outlook to $135–140M of revenue and $0.25–0.30 of earnings contribution, from $130–135M and $0.10–0.15. No company-wide full-year 2026 guidance was issued, and the prior target of greater than 100% free cash flow conversion in 2026 was not restated.

Trajectory

Revenue stepped from $657M in Q1 2026 to $739M in Q2, and organic growth rose from 9% to 14%, with Q3 guided at 21% at the midpoint. Gross margin on the audited basis expanded to 41.4% from 38.7%. EBITDA margin on that same as-reported basis — operating income plus D&A — slipped to 18.2% from 20.8%, while the company's adjusted EBITDA margin rose to 23.6% from 22.9%. Management credits volume leverage, mix and execution, and says the fastest-growing lines, passives and protection, carry high flow-through. Electronics was the strongest segment at 26.3% adjusted EBITDA margin, up 470 bps, while Transportation slipped to 18.6% from 19.1%.

The Model

The model projects FY+1 revenue of $2,950.8M with EBITDA of $702M (23.8%), and FY+2 revenue of $3,340M with EBITDA of $812M (24.3%). The near term rests on the Q3 2026 guide of $780–800M, record bookings with book-to-bill well north of 1.0, and the raised Basler contribution. FY+2 assumes the high-voltage data-center architectures management places in 2027 and beyond begin converting, carrying 2–4x more content than low voltage, and that the Allen, Texas closure delivers savings in the back half of 2027.

Projections are the median of 5 independent model runs. The model’s revenue sits 12.6% above analyst consensus.

Management guided Q3 2026 net sales to $780–800M — 26% growth at the midpoint, including 21% organic growth, a 6% contribution from Basler and a 1% FX headwind — and adjusted diluted EPS to $4.85–5.05, roughly 68% growth at the midpoint, with an adjusted effective tax rate of 23–24%. It raised its full-year 2026 Basler outlook to $135–140M of revenue and $0.25–0.30 of earnings contribution, from $130–135M and $0.10–0.15. No company-wide full-year 2026 guidance was issued, and the prior target of greater than 100% free cash flow conversion in 2026 was not restated.

What Could Go Right — and Wrong

Looking Ahead

The next twelve months run on the quarterly guides: Q3 2026 sales of $780–800M with 21% organic growth, then whatever guide follows. Management says fusion-power shipments begin in Q3 2026, the Allen, Texas closure proceeds toward 2027 with savings in the back half of that year, and high-voltage data-center architectures start arriving in 2027 and beyond. Dr. Karim Hamed takes the expanded CCDI Market & Electronics Segment role on January 1, 2027, ahead of Deepak Nayar's retirement at the end of that year, and management says more acquisitions are coming.

Financials

Annual Summary

Key Ratios (Trailing)

The Company

Littelfuse describes itself as a diversified industrial technology manufacturing company. It makes the components that protect, switch, sense and manage electrical current: fuses and fuse accessories, PTC resettable fuses, electromechanical switches, varistors, gas discharge tubes, protection and switching thyristors, TVS diodes, silicon and silicon carbide MOSFETs and diodes, IGBTs, relays, circuit breakers, sensors and power distribution modules. The 10-K says it has approximately 17,000 associates across more than 20 countries and calls itself a scaled supplier of passive electronics and protection components complemented by high-value-add power semiconductor capabilities.

The business is run in three reportable segments: Electronics, Transportation and Industrial. Manufacturing is spread across China, France, Germany, India, Ireland, Italy, Japan, Lithuania, Mexico, the Philippines, the U.K., the U.S. and Vietnam. Littelfuse owns wafer fabrication: it acquired a 200mm wafer fab in Dortmund from Elmos Semiconductor for approximately €94 million, and it is closing its Allen, Texas power semiconductor manufacturing facility in 2027 as part of a multiyear portfolio optimization and footprint rationalization. Basler Electric, a grid and utility business with roughly $130 million of annualized sales at acquisition, closed in December 2025 for a purchase price of $361.7 million and sits in the Industrial segment.

Business Segments

Competitive Landscape

Littelfuse competes in fragmented component markets. Its 10-K names competitors segment by segment, and Eaton appears in all three — a marker of how the company is placed against a scaled diversified electrical peer. Management attributes share gains largely to design position rather than price or a temporary capacity advantage, and the go-to-market model introduced at the start of 2026 is built to sell the full portfolio into leading OEM customers with system-level solutions. The evidence pack describes the competitive set as fragmented and, in places, capacity- and capital-constrained relative to Littelfuse.

Supply Chain

Littelfuse sits near the top of the electrical chain, selling protection and power components to distributors, data-center power vendors, utilities and automotive OEMs. No supply-chain neighbor named Littelfuse on the tape, and most customer and supplier edges below are unverified wiring.