RE: Please explain6 Oct 2025 09:49
Pj70, here’s a reply from my trading platform about trades looking strange.
Thank you for your email and for taking the time to investigate the issue across multiple devices. I appreciate how frustrating this must be, especially when the figures don’t appear to align at first glance.
I understand there seemed to be a discrepancy between the share prices displayed on our platform and what was shown on the chart. However, I can confirm that both were reporting correct values — they are simply based on different pricing data. On our platform, we display the current buy and sell prices, as we believe these provide the most practical view of what a security is currently worth to you as an investor — what you can buy or sell it for. The daily change figure you see next to the share price is calculated using the previous closing mid-price compared to the current mid-price (if the market is open) or the current closing price (if the market is closed), which is in line with industry standards.
Our charts, however, are based solely on mid-prices, and these update approximately every 15 minutes. The prices shown within the chart represent movements in one-minute intervals and, once the market is closed, the final data point shown will reflect the stock exchange’s official closing price. This figure is calculated independently during the closing auction or post-session activity and may fall outside of the quoted spread — meaning it can differ from the live buy/sell prices you see elsewhere on our site.
Additionally, the day gain/loss figures on our website are not derived by simply comparing the current buy or sell price with the previous close. As is standard across the industry, they are calculated using the previous day’s published mid-price versus the most recent mid-price, based on the last trade on the order book. In contrast, our quoted bid and offer prices reflect current market maker quotes and not actual trade execution data.
It’s also worth noting that the mid-price isn’t always the exact midpoint between the quoted buy and sell prices. In certain situations, such as when a large quantity is traded, the trade may be executed at a premium, affecting the mid-price. In these cases, the spread may not reflect the full picture, and the mid-price may appear outside the typical range.
I stopped trying to understand.
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