To add a bit more detail… instead of looking at a website like Yahoo, try going directly to the stock exchange itself: https://www.londonstockexchange.com/stock/ARB/argo-blockchain-plc/company-page. You will see the bid/offer spread at the top of the page. The stock market is a continuous auction, it’s not like a shop with sticker prices. The bid price, as @J4ipod94 said, is the price that market makers are currently bidding to buy shares of the stock. The offer price is what people who own the stock are saying that you will accept to sell your shares. Right now (well, really 15 minutes ago) the bid was 170.00 and the offer was 175.00. You are one of those people offering at 175.00!