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I believe WordPress is not recognizing the "shareholder_name"

You need to do this

add_action( 'init', 'my_custom_rewrites' );
function my_custom_rewrites(){

    add_rewrite_tag( '%shareholder_name%', '([^/]+)' );

    add_rewrite_rule(
        'our-firm/shareholders/([^/]+)/?',
        'index.php?pagename=shareholders&shareholder_name=$matches[1]',
        'top' );
}