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Banks usually trade shares for one of three reasons. First, they may be acting as a broker to a client an institution such as a pension fund or an individual. Or the bank may be acting as a market maker buying and selling securities to fulfil its obligation to an exchange in order to allow other investors to trade.
However, proprietary trading involves banks risking their own capital to make money. They may trade equities, but also bonds, currencies or commodities. Prop trading is pure speculation and can trigger big profits or losses. For that reason critics argue that it should be split away from much safer activities, such as accepting deposits and making loans, if banks are to retain the right to future taxpayer-funded bail-outs.
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Get the latest financial news, insights and expert analysis from our award-winning MoneyWeek team, to help you understand what really matters when it comes to your finances.
MoneyWeek is written by a team of experienced and award-winning journalists, plus expert columnists. As well as daily digital news and features, MoneyWeek also publishes a weekly magazine, covering investing and personal finance. From share tips, pensions, gold to practical investment tips - we provide a round-up to help you make money and keep it.
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Will fintechs change the way you invest?: MoneyWeek TalksPodcast Fidelity's Tom Stevenson reveals his top three funds for 2026 for your ISA or self-invested personal pension
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Three companies with deep economic moats to buy nowOpinion An economic moat can underpin a company's future returns. Here, Imran Sattar, portfolio manager at Edinburgh Investment Trust, selects three stocks to buy now
