Yup.  I set up the accounts to support this, actually two accounts, one main and one sub account:

Other Current Asset named: Marketable Securities

and Sub Account named: Unrealized Gain/Loss

Larger brokerage firms have the ability to link their investment accounts to financial software.  It would be great to show this important account in the Banking section and have it auto-update with the option to accept/lock in the Unrealized Gain/Loss at month-end for reporting.

Today all this must be handled through manual journal entries at month end or unmatched investment transactions (Cash Transfers) between Cash (linked to checking or savings) and this Marketable Securities account.

Thanks for considering this important addition.  

Johnpc58

P.S. I don't believe QB should be a substitute for detailed investment tracking by security.  I believe many customers would appreciate simple overall account balance data and matching for transfers between Cash<=>Marketable Securities.  If someone wants detail, let them pay for that convenience.