NOS stock gains after PSI index reaches new five-year high

Published on 09/17/2026 at 15:29 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS

NOS stock rose 2.17 percent to EUR 5.41 on Euronext Lisbon as the PSI index closed at a new five-year high on September 16, 2026. The shares are up 34.75 percent year to date with a market capitalization near EUR 2.77 billion.

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NOS, SGPS, S.A. stock (ISIN PTZON0AM0006) closed at EUR 5.41 on Euronext Lisbon on September 16, 2026, up 2.17 percent from the prior session as the PSI index reached a new five-year high according to Investing.com on September 16, 2026.

Stock performance and recent price levels

On September 17, 2026, NOS shares were quoted around EUR 5.42 in real-time trading on Euronext Lisbon, implying a modest intraday gain of 0.18 percent compared with the latest close, while a parallel quote of EUR 5.415 on Boerse Muenchen showed a 0.46 percent rise for that venue, as data from MarketScreener indicate for September 17, 2026.

Based on the same overview from MarketScreener, NOS stock has gained 34.75 percent year to date in 2026 and 37.85 percent over the past twelve months, highlighting a strong recovery compared with the 15.74 percent decline recorded in 2023.

Fundamentals from the latest reported year

The same MarketScreener snapshot lists NOS with net sales of EUR 1,823,200,000 for its most recently reported fiscal year, a level that serves as the current reference for the group’s annual revenue and underpins a market capitalization of EUR 2,772,838,132 as of the latest data point in 2026, according to MarketScreener.

In addition, the performance section in the same source shows that NOS shares have advanced 51.07 percent over three years and 58.16 percent over five years, while still trading below the historical ten-year high of EUR 6.11 and above the ten-year low of EUR 2.72, illustrating the medium-term value creation for shareholders on the Lisbon market as summarized by MarketScreener.

Index move supports NOS stock

The immediate catalyst for NOS stock in mid-September 2026 has been the broader strength of the Portuguese market, with the PSI benchmark gaining 1.00 percent and reaching a new five-year high on September 16, 2026 as utilities, telecoms and consumer services led the advance, according to Investing.com.

Within that session, NOS outperformed the index by rising 2.17 percent, adding EUR 0.12 to close at EUR 5.41, versus the PSI’s 1.00 percent gain, which underscores how investors favored telecom exposure as the Portuguese market pushed to multi-year highs, as detailed by Investing.com.

Closing price and trading context

For investors tracking NOS, the reference price is the Euronext Lisbon quote, where the stock most recently closed at EUR 5.41 on September 16, 2026 and traded around EUR 5.42 in real time on September 17, 2026, while parallel quotations on German and Swiss venues remained broadly aligned with that level.