June 1 (Reuters) - Activist shareholder Elliott Investment Management has built a roughly 4% stake worth A$1 billion ($713.90 million) in Sydney-listed Northern Star Resources NST.AX, the Australian Financial Review reported on Monday, citing people familiar with the matter.

• The AFR report said the stake would place the fund among the gold miner's top five shareholders.

• Elliott Investment Management did not immediately respond to a Reuters request for comment.

• Late last month, Northern Star said its managing director Stuart Tonkin would step down in the first quarter of 2027.

• The resignation came against the backdrop of production downgrades - first in January, citing unplanned maintenance and operational hurdles, and then in March due to weak performance, KCGM mill throughput constraints and reduced productivity.

• Northern Star's shares are down 30% so far this year, after surging 73% in 2025 on the back of rising bullion prices and broader gains in Australian gold explorers' valuations.

($1 = 1.4008 Australian dollars)