Paul Allen net worth: How much was Microsoft co-founder worth when he died?
MICROSOFT co-founder Paul Allen has died aged 65. How much was the businessman worth?
Paul Allen talks about Bill Gates and Microsoft in 2011
A statement from his sister Jody Allen confirmed his death as she described her businessman brother as a "remarkable individual on every level".
The statement continued: ”Paul's family and friends were blessed to experience his wit, warmth, his generosity and deep concern.
“For all the demands on his schedule, there was always time for family and friends.
"At this time of loss and grief for us - and so many others - we are profoundly grateful for the care and concern he demonstrated every day."
Mr Allen had been battling non-Hodgkin’s lymphoma since 1983, beating the illness in 2009 before being diagnosed again this year.
Earlier this month, Mr Allen announced he was once again receiving treatment for lymphoma.
His announcement of treatment had seemed hopeful as he said: “My doctors are optimistic that I will see good results from the latest therapies, as am I.”
How much was Paul Allen worth?
Paul Allen was best known for co-founding Microsoft with school friend Bill Gates in 1975.
He left the company following his first Hodgkin’s diagnosis in 1983.
At the time of his death, Forbes estimates the businessman was worth $20.3 billion.
Mr Allen’s investments weren’t solely in technology, as in 1988 he bought basketball team the Portland Trail Blazers for $70million.
The team are now worth more than 18 times that amount.
A keen sports fan, Mr Allen also bought the NFL Seattle Seahawks in 1997 for $194million, a team which has also increased in value substantially.
Forbes estimates the Seahawks are today worth $2.58billion.
The savvy investor has dedicated a considerable amount of his wealth to charitable causes.
Among these is his signing of the Giving Pledge in 2010, as well as giving away more than $2.5billion in his lifetime - which includes $500million given the Allen Institute for Brain Science.
Mr Allen was listed as one of America’s biggest givers in 2017.
Microsoft CEO Satya Nadella released a statement on Monday praising Allen's "inquisitiveness, curiosity and push for high standards."