Constituents are excluded when filtering using the Not One of operator
If this query does not give you the correct results, consider what you are actually looking for. If you really want to exclude these constituents, the query filter is correct. If you do not want to exclude these constituents, the correct filter depends on what you are looking for. For example, if you would like everyone who has given a gift to a fund other than A, B, or C, filter on Fund one of [all other funds].