Littelfuse INC /de: management transactions · United States · SEC (Form 4)

About Littelfuse INC /de

Littelfuse, Inc. is a U.S.-listed industrial technology company traded on the NASDAQ under the ticker LFUS, so it is an American public-market name for investors following United States equities. For French-speaking investors, the company stands out as a highly specialized industrial franchise focused on electrical protection, power control and sensing. Founded in 1927, Littelfuse has built a long operating history around circuit protection and reliability-critical components. The company is headquartered in Chicago, Illinois, United States, and it operates globally across more than 20 countries, serving a broad customer base in industrial, transportation and electronics end markets. ([sec.gov](https://www.sec.gov/Archives/edgar/data/889331/000114036125008766/ny20037073x4_ars.pdf)) Littelfuse reports its business through three segments: Electronics, Transportation and Industrial. That structure reflects a diversified portfolio of technical products rather than a single end market. The Electronics segment includes fuses and fuse accessories, PTC resettable fuses, electromechanical switches, interconnect solutions, ESD suppressors, varistors, reed-switch based magnetic sensing, gas discharge tubes, TVS diodes, thyristors, MOSFETs and related semiconductor devices. Transportation covers products used in passenger and commercial vehicles, while Industrial addresses applications tied to automation, renewables, energy storage, HVAC, motor drives, power supplies and broader electrical safety needs. In total, Littelfuse serves more than 100,000 end customers and derives a large share of its sales outside the United States; in fiscal 2024, roughly 63% of net sales came from customers outside the U.S. ([sec.gov](https://www.sec.gov/Archives/edgar/data/889331/000114036125008766/ny20037073x4_ars.pdf)) From a competitive standpoint, Littelfuse occupies an attractive niche in mission-critical components. Its devices are embedded into systems where safety, uptime, miniaturization and compliance matter, which tends to support recurring design wins and switching costs. The company’s exposure is closely aligned with long-duration secular trends such as electrification, energy efficiency, automation, connectivity, artificial intelligence infrastructure and safer mobility. That makes Littelfuse more than a simple fuse manufacturer: it is increasingly a provider of enabling technologies for complex electrical systems. ([sec.gov](https://www.sec.gov/Archives/edgar/data/889331/000114036125008766/ny20037073x4_ars.pdf)) Recent developments are important for the investment case. In December 2024, Littelfuse completed the acquisition of the 200mm wafer fab in Dortmund, Germany, strengthening its power semiconductor capabilities. In October 2025, it announced the acquisition of Basler Electric, and the transaction was completed in December 2025, expanding the company’s presence in grid and utility infrastructure, power generation and data center-related applications. The company also reported full-year 2025 results showing revenue growth and margin expansion, while noting a non-cash goodwill impairment tied to the Semiconductor Products business. In 2025 and early 2026, Littelfuse continued to launch new products in high-voltage fuses, automotive current sensors, TVS diodes, MOSFETs and solid-state relays, underscoring an active innovation pipeline. ([investor.littelfuse.com](https://investor.littelfuse.com/news/news-details/2024/Littelfuse-Completes-Acquisition-of-the-200mm-Wafer-Fab-Located-in-Dortmund-Germany/default.aspx?utm_source=openai))