Analog Devices stock ends the day 3.6 percent higher at the close

On September 21, 2026, Analog Devices stock closed at USD 375.72 on the Nasdaq, gaining 3.6 percent versus the prior session, as investors reacted to its planned USD 1.35 billion acquisition of Alif Semiconductor. The move aims to deepen its edge AI capabilities ahead of future systems demand.

Analog Devices stock closed at USD 375.72 on the Nasdaq on September 21, 2026, up 3.6 percent from the previous close, marking a solid advance for the session. Compared with broad U.S. benchmarks, the shares outpaced the Nasdaq Composite, which rose about 0.39 percent that day per Korean market commentary.

September 21, 2026 in numbers

Analog Devices Inc. (ISIN US0326541051, Nasdaq: ADI) finished the regular session at USD 375.72 on the Nasdaq, a gain of 3.6 percent versus the prior close, according to a Korean wrap of the U.S. market. The same overview noted that the Nasdaq Composite ended at roughly 26,522.54 points, up 0.39 percent, underscoring that Analog Devices outperformed the broader technology-heavy index.

The Korean market commentary also highlighted that Analog Devices had previously closed at USD 375.72 after a 3.6 percent jump in the prior session, framing the current move in the context of recent strength. That prior advance already significantly exceeded the index gain and reflected growing interest in the company’s positioning in edge semiconductor applications.

After the bell and the days ahead

The main driver around September 21, 2026 was Analog Devices’ plan to invest USD 1.35 billion in cash to acquire Alif Semiconductor, with an additional USD 200 million in potential contingent consideration, a deal aimed at expanding chips that enable machines to process intelligence at the edge, as reported by Yahoo Finance. A Taiwanese technology outlet similarly noted that Analog Devices and Alif Semiconductor reached a definitive agreement for a USD 13.5 billion cash transaction, with up to USD 2 billion in additional contingent consideration, subject to customary closing conditions and regulatory review, particularly under the Hart-Scott-Rodino Antitrust Improvements Act, as stated by TechNews. Industry coverage of embedded and industrial connectivity also emphasized that the acquisition is intended to advance physical intelligence solutions for next-generation systems, reinforcing the strategic backdrop for the stock, according to Embedded Computing Design. These developments remain central to investor focus after the bell and are likely to shape sentiment on the next U.S. trading day.