More from the same FINRA link already cited. Please refer to the last two lines regarding the broker-dealer's lien on all long positions.
"Accordingly, within a portfolio margin account, to the extent that you have long option and/or margin equity securities positions that do not operate to offset your aggregate indebtedness and thereby reduce your margin requirement, you receive no benefit from carrying those positions in your portfolio margin account and incur the additional risk of the OCC's lien on your long option position(s) and the carrying broker-dealer's lien on all of your long positions."
"Accordingly, within a portfolio margin account, to the extent that you have long option and/or margin equity securities positions that do not operate to offset your aggregate indebtedness and thereby reduce your margin requirement, you receive no benefit from carrying those positions in your portfolio margin account and incur the additional risk of the OCC's lien on your long option position(s) and the carrying broker-dealer's lien on all of your long positions."