Oy Sofia Zweygberg Ab was a Finnish textile retailer and wholesaler that operated from 1868 until the 1970s.

The shop became famous and reputable for its good service, which was provided to every customer irrespective to social class.

[2] Emilia and Viktor Gröönroos's son Veli took the company management, but he fell into alcoholism, failed is job and disappeared somewhere in Germany.

However, he fell out through an open window when he was sleepwalking, broke his spine and died one year after the incident.

Wahlforss took immediate actions, and after half year the company had managed to get 1.3 million marks open receivables and inventory value was decreased substantially.

In January 1926 the company sold its shares of Finlayson & Co. Their value had been rated just 220 000 marks on balance sheets but Wahlforss managed to sell them for 1.42 million.

Oy Sofia Zweygberg Ab moved to Lappeenranta, where it operated until became defunct at the end of the 1970s.