The value of the net long dollar position was $2.11 billion for the week ended Aug. 3, compared with a net long position of $2.99 billion for the prior week.

U.S. dollar positioning was derived from net contracts of International Monetary Market speculators in the Japanese yen, euro, British pound, Swiss franc, and Canadian and Australian dollars.

The latest data marked only the third week since March 2020 that speculators reported a net long position on the dollar.

In a wider measure of dollar positioning that includes net contracts on the New Zealand dollar, Mexican peso, Brazilian real and Russian ruble, the greenback posted a net short of $1.92 billion, down from $2.88 billion a week earlier.

The dollar -- which had rallied hard since late May on solid U.S. data and a shift in interest rate expectations, only to lose steam in recent sessions -- rose sharply on Friday, after a strong U.S. jobs report.

"Strong hiring could mean hawkish hints from the Fed at its late August summit of global central bankers in Jackson Hole, Wyoming," Joe Manimbo, senior market analyst at Western Union Business Solutions in Washington, said in a note.

For investors weighing improving economic data and a potential tapering of asset purchases on the one hand and worries related to the growing spread of the Delta variant of the coronavirus on the other, Friday's data may help tilt the balance, said Michael Brown, senior analyst at payments firm Caxton in London.

"This should definitely swing the balance back towards the former, given how it will heighten expectations for a hawkish pivot from Powell at Jackson Hole, and raise anticipation for the September FOMC," he said.

(Reporting by Saqib Iqbal Ahmed; Editing by Leslie Adler and Sandra Maler)

By Saqib Iqbal Ahmed