I trade BHP Billiton (BLT) from time to time. This morning, as I was looking at trade setups, I noticed that the historical prices for BLT provided by your service (and the Daily Telegraph, which has as its source AJ Bell), compared to prices provided by Bloomberg (and the Financial Times), are very different. For example, as shown in the attachment, your service has the December and January lows at just below 1300, whilst Bloomberg have them below 1200. Also, the March and April 2015 lows in BB are at approximately 1300 compared to your 1400. In fact, all the numbers seem to out by about 100. The current price is the same, so perhaps there is an historical adjustment made as a result of the demerger of South32 in one data service and not another. Could I ask you to look into it and let me know whether that is in fact the case, or if there is another reason at work?

Eoin Treacy's view

Thank you for your detailed email and I can confirm that the price charts have now be rebased to alleviate the step which occurred as a result of the demerger.