Eight members of the Business Journal’s annual OC’s Wealthiest list made this year’s Forbes 400 list, which ranks the wealthiest Americans by estimated net worth.

The Business Journal list, which was published in August, had 45 entries, with a minimum net worth of $250 million. The Forbes list starts at $1.7 billion.

Irvine Company Chairman Donald Bren was No. 1 on the Business Journal list, with an estimated net worth of $16.8 billion. Forbes ranked him at No. 27, with an estimated $15.2 billion. He continues to be the top representative of the real estate sector on the Forbes list. Bren is also the highest ranked Southern Californian on the Forbes list.

David Sun and John Tu of Kingston Technology Corporation ranked No. 2 on the Business Journal list with an estimated $4 billion. Forbes assigned $5.3 billion in wealth to the co-founders of the Fountain Valley company, good for No. 90 in its ranking.

We also ranked Henry Samueli at No. 2 with $4 billion. Forbes estimated that the cofounder of Irvine-based chipmaker Broadcom Corp. had about a $3.1 billion net worth, ranking him at No. 214.

We ranked Broadcom’s other co-founder, Henry Nicholas III, as No. 6 with $3.2 billion in estimated wealth. Forbes ranked him No. 274, with $2.5 billion.

James Jannard the founder of Red Hat Digital Camera Co. ranked No. 6 on our list with $3.2 billion. Forbes ranked him No. 142 with $4 billion.

The “Bond King” Bill Gross was No. 8 on the Business Journal list with an estimated wealth of $2.6 billion. Forbes ranked him No. 290, at $2.4 billion. The co-founder and former chief investment officer of Pacific Investment Management Co. in Newport Beach now works with Janus Capital Group, which recently agreed to merge with London-based Henderson Group PLC in a $2.6 billion all-stock deal.

We ranked real estate developer and investor George Argyros as the 11th wealthiest person in Orange County, with $2.35 billion in personal fortune. Forbes ranked him No. 335, at $2.1 billion.