Multiple users field is saved in a serialized data like this:
I believe you can query the investment custom posts using this arguments code:
$userID = $current_user->ID; $args = array( 'numberposts' => -1, 'post_type' => 'investment_cpt', 'meta_query' => array( array( 'key' => 'investors_attach', 'value' => serialize(strval($userID)), 'compare' => 'LIKE' ), ) );
Where ‘investment_cpt’ is the custom post type of your investment.
Please take a look at this page again to learn more about it: http://www.advancedcustomfields.com/resources/query-posts-custom-fields/.
I hope this helps.
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