Allegro MicroSystems (ALGM): It Beat AND Raised — So Why Is the Stock Down 42%?

Allegro MicroSystems, Inc. (ALGM) Q1 FY2027 — Q1 FY2027 (quarter ended June 26, 2026) net sales were $259.243M, +27% YoY and above the top of management's own $245–255M guide — the sixth consecutive quarter of sequential growth. Non-GAAP diluted EPS of $0.23 beat the ~$0.21 consensus and rose more than 2.5x from $0.09; GAAP diluted EPS was $0.08 versus a $(0.07) loss a year ago. GAAP gross margin expanded to 48.5% from 44.9%, and GAAP operating margin swung from (1.3)% to +9.8%, with operating income of $25.467M against a $(2.740)M loss. Automotive was $165.349M (+15% YoY but only +0.9% sequentially from $163.909M); Industrial and Other was $93.894M (+59% YoY). Data center reached a record 17% of total sales (~$44M), up from 14% last quarter and 10% for all of FY2026. Q2 FY2027 is guided to $265–275M (+26% YoY at the midpoint), non-GAAP gross margin of 50.75–51.75%, non-GAAP opex of $84.5M ±$1M, and non-GAAP EPS of $0.23–0.26 — above consensus. The stock still fell about 5% to $40.08, roughly 42% below its June 30 close of $69.62. Allegro beat and raised, and the stock fell anyway — it is now down about 42% from its June high after tripling in the first half of the year. The quarter was genuinely good, but three things get missed. First, the 27% growth headline is concentrated: Industrial and Other delivered $34.8M of the $55.8M year-over-year revenue increase — 62% of all the growth from 36% of the company — while Automotive, 64% of revenue, grew only 0.9% sequentially. Data center hit a record 17% of sales, up from 10% for all of FY2026. Second, the 'record profitability' story is measured off a bombed-out base: in FY2024 Allegro earned $1.049B of revenue at a 54.8% GAAP gross margin with $196M of operating profit and $0.78 of GAAP EPS. FY2027 will do more revenue at 48.5% gross margin and roughly half the GAAP earnings — a ~600bp hole management's own 50.75–51.75% non-GAAP guide concedes. Third, the operating leverage is real (a 50% incremental operating margin, opex +6.5% on revenue +27%) but partly funded by SG&A falling 5.4% while R&D rose 18.6%. Our owner-earnings DCF at a 9% discount rate lands at $27 base / $46 bull; we call fair value $28 against $40.08. The reverse DCF says the price requires ~22–23% free-cash-flow growth every year for a decade. Our call: AVOID, 2/5 — the crash was justified and isn't finished. Wall Street is Buy at a $54.43 average target, so we're CAUTIOUS and we differ. THE CALL: AVOID (2/5, THE GROWTH IS REAL — THE PRICE ISN'T; A 42% CRASH THAT ISN'T FINISHED) — base-case value ~$28.00 vs ~$40.08 today. What to watch: evidence the data-center mix is ACCRETIVE rather than dilutive — GAAP gross margin pushing back toward the mid-50s while data center keeps growing, plus Automotive resuming real sequential growth; get gross margin to 54% again on this revenue base and fair value moves toward the $46 bull case. The risk is the opposite: Automotive staying flat while data-center orders prove lumpy and hyperscaler-concentrated, because 62% of the year-over-year growth came from 36% of the revenue — one paused AI build could take the whole growth rate to zero. Watch the Automotive sequential line and the gross margin every quarter. Also on YouTube: @ChargedAlpha DISCLAIMER: For informational and educational purposes only. Not financial advice. Do your own research before any investment decision.