Building an evidence file for a slippage complaint

[Amanhasnoname]

A complaint to a broker or regulator about poor execution succeeds when it is backed by data. A general sense of being treated unfairly rarely gets action.

A strong evidence file includes a list of affected trades with ticket numbers, timestamps with the time zone clearly stated, requested prices, fill prices, and the market quotes around the time from a second independent source, if available. Screenshots of the platform showing the quote at the moment of the order are valuable.

The analysis should show a pattern, not a single event. Statistics such as the average slippage on winners versus losers, or the distribution of fill delays, carry more weight than anecdotes.

Be precise in the narrative. State what happened, why it deviates from the terms, and what remedy is requested.

Keep communications written. If support responds by phone, follow with an email summarizing the conversation.

The effort is substantial, but the file is also valuable internally, since it exposes real execution problems early.

What does the evidence file include, and which part has been the hardest to document?