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Why Did Semtech (SMTC) Move Today?

Simply Wall St · 2d ago

Semtech (SMTC) is back in focus after the company expanded its long running partnership with Tower Semiconductor, committing fresh investment to secure silicon germanium capacity for AI data center optical interconnect components.

Recent trading has been choppy for Semtech, with the share price falling 17.69% over the past week and 23.12% over the last 30 days. However, the 90 day share price return is up 3.86% and the year to date share price return is 88.97%. Longer term momentum also remains strong, with a 1 year total shareholder return of 109.95% and a very large 3 year total shareholder return of about 8x, which hints at how quickly sentiment around the company has shifted as investors reassess both growth potential and execution risk around its AI focused projects.

Scan beyond Semtech and line up other AI infrastructure plays using our curated list of 55 AI infrastructure stocks for a broader view of where capital is chasing data center demand.

After a near 9x three year run and a sharp pullback in recent weeks, is Semtech still pricing in meaningful AI upside, or has most of the good news already been captured in the share price as it sits near $142?

Most Popular Narrative: 35% Undervalued

Semtech's most followed narrative pegs fair value at $220, above the last close at $142.22. This frames today’s pullback as a valuation gap that depends on how well its AI and IoT roadmaps are executed.

Accelerating demand from hyperscale data centers and AI infrastructure is associated with robust, multi-year growth across Semtech's high-margin data center business, supported by design wins in advanced optical (FiberEdge), low-power (LPO), and active copper interconnects (CopperEdge/ACC). As data rates move from 400G to 800G and 1.6T, Semtech may capture additional revenue and margin expansion from new content per deployment.

See why 38 investors see Semtech as 35% undervalued.

Result: Fair Value of $220.00 (UNDERVALUED)

Still, Semtech’s narrative can break if lower margin IoT and consumer activity continues to dilute profitability, or if China dependent demand turns erratic again.

Find out about the key risks to this Semtech narrative.

Another View: Semtech On Earnings Multiples

There is a catch. Semtech trades on a P/E of 86.2x, while the US Semiconductor industry sits closer to 44.4x and peers average 44.6x. The Simply Wall St fair ratio is 45.4x, so the current price implies far less room for error if growth stumbles or sentiment cools.

That kind of gap can either reflect strong conviction in Semtech's AI and IoT roadmap, or signal valuation risk if expectations reset or higher quality alternatives look cheaper on the same metric.

See what the numbers say about this price — find out in our valuation breakdown.

NasdaqGS:SMTC P/E Ratio as at Oct 2026
NasdaqGS:SMTC P/E Ratio as at Oct 2026

Next Steps

Sentiment around Semtech is clearly split, with both upside potential and real concerns in play, so move quickly and weigh the data for yourself. To see the full balance of potential upside against the issues investors are flagging, review the 4 key rewards and 3 important warning signs.

Looking for more investment ideas beyond Semtech?

Do not stop with Semtech. Use fresh screeners to spot stocks that match your style, whether you care most about value, resilience, or income potential.

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