LITTELFUSE INC /DE (LFUS) stock intrinsic value fair value estimate & owner earnings analysis

Littelfuse makes fuses, circuit protection, power semiconductors, switches and sensors in three segments: Electronics (about $1.35 billion of 2025 sales), Transportation (about $676 million) and Industrial (about $364 million before Basler Electric). Its products are small, inexpensive parts that are designed into customers' equipment and rarely swapped out, so share is sticky. Demand still swings with the electronics, automotive and industrial cycles, along with how much inventory distributors decide to carry. How we measure earnings. We start from operating cash flow and strip out working-capital swings. We subtract stock compensation as a real cost and subtract the capital spending needed to keep the business as it is (about 4% of sales). Spending that only funds growth in sales is not subtracted. Amortization of acquired intangibles and impairment write-offs are non-cash and are added back. That includes the $301 million goodwill write-off on the semiconductor business in 2025 and $94 million of impairments in 2024. Because those write-offs show some acquisitions destroyed value, we carry that risk in the bear case rather than in the earnings figure. We also add back interest paid, about $34 million a year, so we value the whole business first and subtract debt afterward. On that basis, business cash flow per share ran $10.70 (2018), $8.11 (2019), $8.11 (2020), $14.60 (2021), $19.10 (2022), $14.36 (2023), $10.85 (2024) and $14.27 (2025). Those eight years span a full cycle: the 2019-2020 industrial and auto slump, the 2021-2022 shortage boom and the 2023-2024 destocking. Their median is about $12.56 a share, roughly $320 million. We exclude years before 2018 because the 2018 IXYS acquisition made Littelfuse a substantially larger, more semiconductor-heavy company. Basler Electric was bought for cash in December 2025 and brings about $130 million of annual sales. That lifts our normal level to about $345 million. What has changed. Since our last look, the full 2025 annual report shows unfilled orders of $1.07 billion at year end, up from $665 million, with increases in all segments and substantially all of it scheduled to ship in 2026. First-quarter 2026 sales were $657 million, up from $554 million, and operating cash flow was $80 million, up from $66 million. Borrowings fell to about $632 million against $482 million of cash. Our earlier figures were built on a different basis and are not comparable to these. Base case: about $218 a share. In 2026 the business turns its backlog into roughly $400 million of business cash flow, about 13% above 2025. That is below the 32% rise actually achieved in 2025, and the backlog is already in hand. After that it settles back to the normal cycle-average level of about $345 million and stays there. Littelfuse has stayed in this business since 1927 and its parts are designed into its customers' platforms, so we see no evidenced reason for the earning power to fade. We credit no growth beyond that. Acquisitions have driven most of Littelfuse's past growth but have also produced repeated write-offs, so we do not count future deals as growth in hand. Electrification, data-center power and electric-vehicle content are market expansions, not secured growth, and are left out. The business is worth about $5.8 billion; less about $270 million of net debt, roughly $5.5 billion for shareholders. Bear case: about $165 a share. The order book carries 2026, but the industry then has a downturn like 2019-2020 stacked on a destocking like 2023-2024. Business cash flow falls to about $205 million in 2028, the 2019-2020 trough level. It recovers to only about $300 million, below the cycle average, because further acquisitions underperform and need more write-offs, as the semiconductor unit did. After that it shrinks about 1% a year. Even at the trough, cash flow covers interest about six times. The business is worth about $4.5 billion, less $270 million of net debt, for about $4.2 billion. Bull case: about $317 a share. Backlog conversion and the Basler contribution lift business cash flow to about $440 million in 2026, near the 2022-2023 level, and it then grows about 2% a year. That rate rests on Littelfuse's long record of price increases on protection products and steady design-in wins. The business is worth about $8.3 billion, less $270 million of net debt, for about $8.1 billion. Debt. Borrowings at the end of March 2026 were about $632 million. They include $100 million of notes due 2027, $125 million due 2030, $100 million due 2032, a term loan, and €95 million of 1.83% notes due 2028. Against that sits about $482 million of cash, part of which the business needs to run. Interest is modest compared with cash flow, maturities are spread out, and the euro notes are cheap. No case is constrained by debt. Margin of safety price: $120. We are fairly confident in the normal earnings level because it is drawn from a full cycle, and in every one of the last eight years the business produced at least $8 a share of cash before interest. The worst plausible outcome is a deep, simultaneous downturn in autos, industrial equipment and electronics, combined with another poorly bought acquisition. Littelfuse has modest debt, thousands of customers and no dependence on a single product or regulator, so it would survive that and keep paying a dividend of about $2.90 a share. The things we are most likely to be wrong about are how high a normal year really is and whether management keeps paying too much for acquisitions. If normal cash flow were only the 2019-2020 level and acquisitions kept destroying capital, the shares would be worth about the bear figure. At $120, about 9-10 times normal cash flow, the base case implies a 20% annual return within about three years, and the price sits well below the bear-case value.