Arm's stock price has nearly doubled in a few weeks, with a projected P/E ratio of 170 times, putting it among the most highly valued stocks.

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Arm's share price has nearly doubled in a matter of weeks, pushing the chip design company's valuation to an extremely rare level in the market, with a P/E ratio breaking 170 times and prompting widespread warnings of downside risk from Wall Street analysts.

Arm's American Depositary Receipts (ADR) have risen 244% so far this year, ranking third among S&P 500 constituents and second among Philadelphia Semiconductor Index components.

The latest round of gains began on May 15—after the company was subjected to an antitrust investigation by the Federal Trade Commission (FTC), its stock price plunged but then rebounded strongly. Since then, Arm has risen a total of 79%, adding about $180 billion to its market value. In the same period, the Philadelphia Semiconductor Index rose about 14%, and the S&P 500 only climbed 1.9%.

Arm currently trades at a forward 12-month P/E ratio of over 170 times, up from about 51 times at the start of the year; based on expected revenue, the price-to-sales ratio is 67 times. By net profit, Arm's valuation in the S&P 500 is second only to Tesla and Live Nation Entertainment.

However, Arm shares fell as much as 9.9% intraday on Thursday, as Broadcom released a disappointing sales forecast for artificial intelligence chips, pressuring the broader AI sector.

Valuation at extreme levels, surpassing the vast majority of S&P 500 members

The stock currently trades at a forward 12-month P/E ratio of over 170 times, up from about 51 times at the beginning of the year; its price-to-sales ratio is 67 times based on expected revenue.

By net profit, Arm’s valuation in the S&P 500 is only surpassed by Tesla and Live Nation Entertainment; based on revenue, Arm is unmatched—the closest comparable is Palantir Technologies, with a price-to-sales ratio of about 37 times.

Dennis Dick, Head of Trading at Triple D Trading, said:

"Arm's stock price is so far removed from fundamental value that it's hard to touch this stock. For me, it's likely best to stay away from Arm right now."

Dave Mazza, CEO of Roundhill Investments and holder of Arm ADRs, also expressed a cautious stance:

"As far as we can judge, the fundamentals are very strong, but the current valuation is a key risk, because what you’re paying today is the price for 2030."

Growth logic bets on long-term transformation, limited recent performance contribution

Arm currently derives most of its revenue from the smartphone market, which is relatively slow-growing. The company is actively expanding into the booming AI data center market and plans to launch its own chip for the first time to directly capture this demand.

Arm's revenue for fiscal 2026 ending March this year was $4.9 billion, expected to rise to $6 billion next fiscal year and close to $8 billion in fiscal 2028. The company aims to achieve $15 billion in revenue from its own chip business by the end of this decade.

Arm CEO Rene Haas said Tuesday he is "very confident" about achieving this goal ahead of schedule.

However, according to analyst forecasts compiled by Bloomberg, over the past three months, market expectations for Arm's fiscal 2029 revenue have been raised by 22%, but forecasts for the current fiscal year have barely changed.

This means the growth implied in the current stock price mainly depends on tech giants continuing to invest heavily in data infrastructure over the next several years. Mazza said:

"The bull thesis is entirely based on a business model transformation, not on anything happening in 2026."

Analyst ratings are mostly positive, but target price suggests significant downside risk

Wall Street is clearly divided on Arm. Of 47 analysts tracked by Bloomberg covering the company, 33 have a buy rating and only 2 have a sell rating, but the average analyst target price is about $259, implying about 37% downside for Arm ADRs over the next 12 months versus current prices.

This rare coexistence of "buy rating" and "bearish target price" reflects the prevailing mindset of market recognition of Arm's fundamentals but doubt about its valuation. Mazza concluded:

"I still think this is an excellent company, but the stock price itself has reached a point where question marks must be raised from an investment perspective."

Dick attributed the current movement in Arm’s stock price simply to momentum:

"This is pure momentum. I’ve been a professional trader for 27 years; this momentum is insane. Once it moves in one direction, it just doesn’t stop."

Risk Warning and DisclaimerThe market has risks; investment needs caution. This article does not constitute personal investment advice, nor does it take into account individual users’ special investment objectives, financial situation or needs. Users should consider whether any opinions, views or conclusions in this article fit their particular circumstances. Investing based on this content is at your own risk. ```