While it may be difficult to verify first-hand how secure your stockbroker keeps your personal information, a recent order from the Securities and Exchange Commission (SEC) shows that even the largest stockbrokers are prone to customer data breaches.
On September 20, 2022, the SEC fined financial services giant Morgan Stanley Smith Barney (“MSSB”) $35 million for failing to adequately protect its customer’s records and personal identifying information (“PII”).  The fine was entered via a settlement between the SEC and MSSB, through which MSSB has agreed to pay a civil penalty for the SEC’s charges without admitting to nor denying the violations. 
MSSB is a subsidiary of Morgan Stanley and focuses on wealth management services for clients ranging from individuals to large corporations.  More specifically, MSSB is the broker-dealer designation for the group more commonly known as Morgan Stanley Wealth Management.  During the second quarter of 2022, Morgan Stanley Wealth Management recorded $5.7 billion in net revenues.