Why are the prices I have exported to Excel truncated?

It is possible to download activity statements for your entire account, but not for a particular position.

If you download activity statements in CSV format, you will be able to open them with Microsoft Excel or similar programs and select the data you are interested in viewing…

When uploading historical data via CSV file, the upload file can contain three types of records: Position, Asset Transaction and Cash Transaction. You may include multiple record types in the same upload file.

See the supported File Formats…

You can set the number of decimal places to any integer value from 1 to 6. For example, setting the value to 2 will display Last Size values formatted to two decimal places…

Yes. In addition to the TurboTax .TXF format, IBKR supports the download of this worksheet in a Comma-Separated Values, or .CSV file format.  Files in this format can be opened in applications such as Microsoft Excel, Open Office Calc or Google Docs. The .CSV file format is not supported for purposes of import to TurboTax. IB also supports the download of this worksheet in PDF format…