Swisscom stock falls as SMI exit and telecom weakness weigh

Published on 09/18/2026 at 13:47 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS

Swisscom stock drops around 2.8 percent on September 18, 2026 as the shares are traded for the last time in the SMI before being replaced. The move comes amid broader telecom softness that leaves Swisscom among the weakest large caps in Zurich.

Photorealistic mobile phone tower standing on an alpine meadow with snow-capped Swiss mountain peaks in the background under a dramatic orange and pink sunset sky — Swisscom AG (CH0008742519) – Mobilfunkmast in Schweizer Alpenlandschaft bei goldenem Sonnenuntergang über schroffen Bergspitzen, Illustration mit AI erstellt.

Swisscom stock (ISIN CH0008742519) is under pressure on September 18, 2026, with recent quotes around 652.50 CHF on SIX, down about 2.8 percent from the prior close as the shares are traded for the last time in the Swiss Market Index before being replaced.cash.ch

SMI exit hits Swisscom shares

According to cash.ch on September 18, 2026, Swisscom shares are recording the largest loss in the SMI, sliding 2.8 percent to 652.50 CHF as of 12:37 local time on the day they are traded for the last time in the blue-chip index before being replaced.

Market commentary from Zonebourse on September 18, 2026 notes that Swisscom was down about 3.0 percent late in the morning, placing the telecom group at the bottom of the Zurich market board as investors digest its upcoming removal from the SMI.

Intraday price moves and index context

Earlier in the session on September 18, 2026, Swisscom shares were quoted at 660.50 CHF on SIX, representing a loss of about 1.6 percent compared with the previous day, before extending their decline later in the day.finanzen.ch

In the broader Swiss equity market, Swisscom is also highlighted as one of the weakest names in the SMI and SLI, with declines between 1.6 percent and 2.9 percent and prices in a range from 652.00 CHF to 660.50 CHF on September 18, 2026, underscoring how telecoms and other defensives weighed on the Zurich indices.finanzen.ch finanzen.ch

Recent fundamentals provide backdrop

Swisscom most recently reported its half-year 2026 results earlier in the year, and while those detailed figures are not repeated in the week-filtered sources, investors can find the latest revenue, earnings and cash flow metrics, together with guidance, in the company's investor-relations section.Swisscom

For index-oriented investors, the key change on September 18, 2026 is that Swisscom stock is being removed from the SMI after this session, which can trigger portfolio adjustments among passive funds and benchmark-driven strategies and may be contributing to the day's downward pressure on the shares.cash.ch

Swisscom share price and trading data

As of September 18, 2026 at around 12:37 local time, Swisscom stock is quoted at 652.50 CHF on SIX, down 19.00 CHF or 2.83 percent on the day from the prior close, making it the biggest loser among the 20 SMI constituents at that moment.cash.ch