CHRONOLOGY: The fall of oil trader SemGroup LP

NEW YORK (Reuters) - Fast-growing U.S. oil trader SemGroup LP unraveled spectacularly this week after it suffered a $3.2 billion loss on oil futures and derivatives positions that were primarily bets that the price of oil would fall.

The following is a chronology of the events leading to the company's bankruptcy filing on July 22:

JULY 15

-SemGroup holds a teleconference with lenders where it discloses its liquidity problems

JULY 16

-Bank of America (BAC.N: Quote, Profile, Research, Stock Buzz) issues a default notice on $2.55 billion in secured debt

-SemGroup transfers its NYMEX oil futures book to Barclays,

incurring a $2.4 billion loss including $290 million that is owed to SemGroup by a trading company affiliated with its co-founder and CEO Thomas Kivisto.

-Kivisto resigns from the board of Oklahoma bank BO Financial Corp (BOKF.O: Quote, Profile, Research, Stock Buzz). BOK had been providing hedging services to SemGroup

JULY 17

-Kivisto is placed on "administrative leave."

-Counterparties in over-the-counter energy derivatives begin to terminate bilateral trades. SemGroup's OTC book was marked to market at negative $850 million.

-Shares of SemGroup Energy Partners LP (SGLP.O: Quote, Profile, Research, Stock Buzz), SemGroup's

publicly-traded subsidiary fall sharply

-Moody's and Fitch downgrade SemGroup debt

-SemGroup Energy Partners makes first public statement about SemGroup's problems after close of stock market