The broad OMXS index fell 1.0 percent and the large-cap index OMXS30 declined 0.8 percent. Still half an hour before closing, both indexes were on plus.
The worst in OMXS30 was the venture capital company EQT and the gaming company Evolution, down 4.3 and 3.3 percent, respectively.
Defense stocks fell broadly on Thursday after the reports of a ceasefire in Gaza. On Friday, Saab fell 2.1 percent.
Primarily some of the major banks pulled upwards. The best of them was Swedbank, up 1.1 percent.
Telecom giant Ericsson, which will present its interim report next week, rose 0.4 percent.
With Friday's decline, OMXS lost 0.1 percent during the past week. Several analysts have begun to question the recent strong rise on the world's stock exchanges, especially the rush in AI-related companies.
Since Donald Trump's tariff gamble in April, the global index MSCI has risen by more than 30 percent, where tech companies have been the big winners. Now, however, concerns about a bubble on the stock market are being raised from several quarters.
One of Friday's winners among the smaller companies in Stockholm was Atrium Ljungberg, which was the first among real estate companies to release interim figures. The stock rose 3.5 percent.
The leading European stock exchanges declined. The most was the Paris stock exchange, which lost nearly 2 percent.
