CommSec
| Company type | Subsidiary | 
|---|---|
| Industry | Financial services | 
| Founded | 17 July 1995 | 
| Headquarters | Sydney, Australia | 
| Area served | 
 | 
| Key people | James Fowle (Executive General Manager) | 
| Products | CDIA CommSec Margin Loan CommSec Pocket | 
| Parent | Commonwealth Bank | 
| Website | www.commsec.com.au | 
Commonwealth Securities Limited, or CommSec, is Australia's largest online stockbroking firm. It is a subsidiary of the Commonwealth Bank.
Though its Internet trading platform constitutes the vast majority of its business, it also offers a telephone based brokerage service, and investment advisory services. In addition, CommSec also offers other peripherally related investment services, such as margin loan and cash accounts.