Warren Buffett's followers just got a rare peek inside his personal stock portfolio. Here's what they learned from a new report.

• Warren Buffett's disciples got a rare peek inside his personal stock portfolio this week.
• The investor sold nearly $500 million of stocks over 20 years, ProPublica reported, citing IRS data.
• Buffett's private holdings have reportedly included Wells Fargo, Walmart, and Johnson & Johnson.

Warren Buffett's followers got a rare glimpse inside his personal stock portfolio this week, revealing the famed investor and Berkshire Hathaway CEO has counted Wells Fargo, Walmart, and Johnson & Johnson among his private holdings over the years.