<prompt> Human: Just a thought, owning Berkshire shares is like owning a mutual fund managed by Warren Buffet. Hes pretty good at his job right? Yeah there would be transaction costs but if you buy enough, the cost could be less than a Vanguard fee.  <response>: The 5th-6th largest holding of SP 500 funds is BRK.B, so youre getting a bit of both. 