In Marketo, the query string is recorded as part of a Munchkin Visit Web Page activity, and is part of the Referrer property of a Filled Out Form activity.
The query string can also be automatically parsed into individual hidden fields on a Marketo form (the Autofill feature).
However, the query string is not otherwise a “first class” reportable property in the Marketo UI.
Unless you purposely save the query string to its own custom field, you can’t have a Smart List with a column for “last query string”. Nor can you get reports in Marketo of all pages visited by a group of people, just in general.
Using the Marketo REST API, you can extract all activities from known leads, which will include the query string. You could use that to build a quite robust report, but it’ll be offline, not in the UI.
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