Periodic reports submitted by federal committees, listed by committee.
Which form belongs to whom
Presidential committees file Form 3P. House and Senate campaigns file Form 3. PACs, party committees and independent-expenditure-only committees file Form 3X. The form decides which schedules exist behind the summary, so it is the first thing to read rather than the last.
The filing you want is usually an amendment
Originals are superseded quietly. A committee that discovers a misreported receipt files an amended report covering the same dates, and both versions stay public with no notice on the old one. Comparing an original against its amendment is a legitimate way to see what a committee corrected.
Filings held here
The authoritative copy of any filing referred to here is the Commission's own record; identifiers are printed so that the original can be retrieved.