XTB's share of Poland's brokerage accounts reached about 42% at the end of October, up from roughly 30% a year earlier. The Central Securities Depository of Poland (KDPW) published the figures on Monday.The Warsaw-listed broker ran more than 1.336 million of the market's 3.155 million accounts. In October alone it opened about 50,900 of the 64,416 accounts added across all firms, or 79%, by FinanceMagnates.com's calculation from the KDPW figures.Over 12 months, XTB added 620,262 of the 774,795 new accounts in the market, about four in five, the same share it took in October 2025. Its count is now more than twice that of mBank's brokerage arm, the second-largest, at just under 589,000.The market as a whole grew about 33% in that time. KDPW counted 2,856,520 accounts in May, FM Intelligence data show, and nearly 300,000 have been added since.London's trading industry is coming home!Accounts in Poland, Clients AbroadThe KDPW count covers securities accounts with access to the Polish market, so it leaves out XTB's foreign clients. Worldwide, XTB reported more than 100,600 new clients in October's first 27 days, about 5% more than a year earlier.The two numbers are not directly comparable, since one counts accounts and the other clients. Still, the Polish intake fell from a year earlier while the global one rose, as XTB opens Warsaw-listed shares to its EU clients under a pilot with the exchange.Where those clients come from can be tracked by country in FM Intelligence's heat map of broker website traffic, which covers XTB and 97 other retail brokers.Some of the competition sits outside the KDPW statistics altogether. Revolut, which reported 590,000 Polish investment accounts in August 2025, operates under a Lithuanian license and is not part of the data.The Rest of the Market Picked UpOctober's figures also show XTB's intake flattening while other firms gained pace. XTB's 50,900 new accounts compare with about 50,250 in September, a rise of roughly 1%.The rest of the market opened about 13,500 accounts, up 28% from about 10,550 a month earlier. mBank added 6,770 and ING's brokerage about 2,300.Against last year, XTB's monthly intake fell about 13% from 58,318 in October 2025, while the rest of the market was nearly flat at about 13,400 then. The slowdown in XTB's Polish openings first showed in May.Its share of the month's new accounts slipped to 79% from about 83% in September and 81% a year earlier. That is still four of every five accounts opened in Poland, against a market in which the second-largest firm added fewer than 7,000.Competition for new Polish savers has widened since a year ago, when Germany's Trade Republic entered Poland as its first market outside the eurozone. XTB's share of monthly openings has moved by about two percentage points since then.This article was written by Damian Chmiel at www.financemagnates.com.