ALGM · Allegro MicroSystems, Inc.

The thesis

Allegro MicroSystems' data-center growth is real but still a minority of sales, and the shares sit 51.2% below their 52-week high of $69.62 after closing at $33.98 on 27 October 2026. The fiscal second-quarter report, due before the market opens on 29 October 2026, settles whether sales confirm management's forecast that fiscal 2027 data-center revenue more than doubles.

The narrative is maturing: the story is well known, analysts still carry targets far above the price, and the shares are down 18.0% over three months with no new buying visible since the 14 October 2026 close of $32.22. The operating numbers filed on 30 July 2026 have not changed.

Since the previous note, the close recovered from $32.22 (14 October 2026) to $33.98 (27 October 2026). The 14-day relative strength index (RSI, a 0–100 momentum gauge) is 39.2. The evidence for beating the S&P 500 over the next three months does not yet lift the rating above low; the report is the next hard data point.

Bullish and bearish views on Allegro MicroSystems, Inc.

The bull case on Allegro MicroSystems, Inc. (ALGM), in brief: Data center is a visible revenue line. The bear case: Targets are being trimmed into the report.

Bull case

• Data center is a visible revenue line. It reached a record 17% of sales and rose 32% sequentially. Management guided fiscal 2027 data-center revenue to more than double year over year (Q1 FY2027 earnings call, 30 July 2026).
• Guidance points up. Fiscal second-quarter sales are guided to $265–275 million, gross margin to 50.75–51.75% and non-GAAP EPS to $0.23–0.26 (Allegro results release, 30 July 2026). Fiscal fourth-quarter 2026 sales had been $243.19 million.
• Large-bank coverage stays positive. Morgan Stanley assigned an Overweight rating on 26 October 2026, and Wells Fargo kept Overweight on 20 October 2026 (Benzinga headlines). RBC Capital initiated at Outperform with a $50 target on 2 October 2026.
• New data-center products. Allegro announced power and cooling products for 800-volt AI data centers on 27 October 2026 (company news).

Bear case

• Targets are being trimmed into the report. Wells Fargo lowered its target to $45 on 20 October 2026 while keeping Overweight (Benzinga). TD Cowen cut to $48 from $66 and Mizuho to $58 from $67 after the first-quarter report, and Barclays moved to Equal Weight with a $48 target on 20 July 2026 (MarketBeat).
• The shares lag the AI theme. The Nasdaq 100 and Nvidia reached record highs on 2 October 2026 (Benzinga), while Allegro closed at $33.98 on 27 October 2026.
• Key price levels have broken. The close is below the $40 level lost on 18 August 2026 and the $50 level that marked the June re-rating.
• Data center is a minority of the business. About 83% of sales remain cyclical automotive and broad industrial demand (Q1 FY2027 call, 30 July 2026).
• Valuation rests on thin earnings. Trefis put the trailing GAAP price-to-earnings ratio at 486.2 on 22 August 2026.
• Insiders have been selling. Form 4 filings show an SVP sale of 2,285 shares on 12 August 2026 and a director sale of 1,000 shares on 18 August 2026, both under Rule 10b5-1 trading plans.

Price setup

The last adjusted close is $33.98 (27 October 2026), 51.2% below the 52-week high of $69.62. The three-month price change is -18.0% and the RSI(14) is 39.2.

The 14 October 2026 close of $32.22 is the recent low among closes cited in this note. The round-number level at $30 sits below it. Above the price, $34.10 (the 18 September 2026 close) and $40 (lost 18 August 2026) are the nearest reference points from earlier moves.

Crowding evidence is mixed. The earnings date is one session away. Insider sales in August ran through preset plans, and Sanken Electric's reduced stake remains a supply overhang. Heavy retail attention is not evident in the news flow, and the price sits well below the high rather than extended above a rising average.

On 18 August 2026 the shares fell 9.6% while a broad chip gauge fell about 5%, so a reaction larger than the sector's has precedent for this name.

Catalysts, next 30 days

No other dated company event falls inside the window.

Elapsed catalysts

• 29 October 2026, before the market opens: fiscal Q2 2027 results, with a call at 8:30 a.m. Eastern. It tests the $265–275 million sales guide, the 50.75–51.75% gross margin range and the more-than-double data-center forecast. (passed 8d ago)

What would change the view

The case breaks if fiscal Q2 2027 sales come in below the $265 million floor, or if management withdraws or lowers its forecast that fiscal 2027 data-center revenue more than doubles. A close below $30 would also end it, a round-number level under the 27 October 2026 close of $33.98.

A report with sales in or above the guided range, a firm data-center forecast and gross margin within the guided range would strengthen the case. The rating would then be reviewed on that new information, not on the share price alone.

What it trades with

Allegro trades with AI-linked chip suppliers on sector sell-offs, as on 18 August 2026, but its automotive and industrial exposure (about 83% of sales) ties it to cyclical demand as well. Nvidia's data-center results (Q2 FY2027 revenue of $89.0 billion, up 117% year over year, reported 26 August 2026) frame the demand backdrop but have not lifted the shares.

Fiscal quarters end late March, June, September and December. Q2 FY2027 ended 25 September 2026, so comparisons with calendar-year peers need adjustment.