FACTBOX - Details on top Barclays investors

(Reuters) - British bank Barclays is raising 7.3 billion pounds from investors from Qatar, Abu Dhabi and elsewhere through a range of complex capital instruments.

The capital raising could leave Middle East investors with almost one-third of the bank's shares. The bank's shareholder base has been transformed in the last two years by several fundraisings.

The following are details of its major investors:

--Barclays is raising up to 3.5 billion pounds from Sheikh Mansour Bin Zayed Al Nahyan under Friday's deal. He can also subscribe to buy warrants, which could leave him with a 16.3 percent stake in the bank. He said it is a personal investment.

A brother of the president of the United Arab Emirates, he is Minister of Presidential Affairs, chairman of Abu Dhabi Petroleum Investment Company, chairman of First Gulf Bank and a member of the Higher Council for Petroleum, Emirate of Abu Dhabi.

--Barclays is raising up to 2 billion pounds from Qatar's sovereign wealth fund. Additional warrants could leave the Qatar Investment Authority (QIA) with a 12.7 percent stake, after it invested in a fundraising in the summer.

QIA was founded by the State of Qatar in 2005 to strengthen its economy by diversifying into new asset classes. The investment was made through its subsidiary Qatar Holding, the prime vehicle for strategic and direct investments by the State of Qatar.

--Barclays is tapping Challenger, an investment vehicle of a member of Qatar's royal family, for 300 million pounds, which would leave it with a 2.8 percent stake.

Challenger is owned by Sheikh Hamad bin Jassim bin Jabr al-Thani, a member of the royal family of Qatar and prime minister, and the chairman of Qatar Holding, and his family.