Trading in US Markets via Phillip Securities is only available to non-US citizen / non-US resident.
You have to sign and mail-in the W-8Ben Form before trading in the US market.
When will W8-BEN form expire?
W8-BEN form will remain in effect for a period of 3 years, starting on the date the form is signed and expiring on the last day of the 3rd succeeding calendar year. It is mandatory for you to renew this form before the last day of the 3rd succeeding calendar year in order to continue to trade in the US market. Failing which, Phillip Securities Pte Ltd “PSPL” will cease to provide custodian services to your US portfolio.