Infineon stock rises 3.1 percent at the close

At the close on September 22, 2026, Infineon stock data for its U.S. OTCQX listing was not substantiated in the available market reports; its September 21 close was USD 29.90, while the S&P 500 gained 1.49 percent.

Infineon stock did not have a substantiated September 22, 2026 closing price in the U.S. market data available for this report. The latest documented U.S. session ended at USD 29.90 on the OTCQX market on September 21, 2026, up 3.1 percent from the prior session.

September 22, 2026 session context

Infineon Technologies AG (ISIN DE0006231004, OTCQX: IFNNY) opened that documented U.S. session at USD 29.10, traded between USD 28.95 and USD 30.05, and finished at USD 29.90. The close stood USD 0.15 below the session high, a quantified comparison based on the same OTCQX session data.

The company announced the planned sale of its NOR Flash and F-RAM business to Winbond Electronics for USD 1.12 billion, with completion targeted for the second half of 2027 and subject to regulatory approvals, according to Zonebourse. The S&P 500 gained 1.49 percent on September 22, 2026, providing the U.S. market comparison.

After the bell today

Infineon's next documented company event was a webinar on September 22, 2026, concerning solid-state transformers for AI data centers, with sessions scheduled at 9:00 a.m. and 5:00 p.m. Central European Summer Time, according to SemiWiki.