** Shares of Aussie Broadband ABB.AX rise 3.9% to A$3.78, their highest level since Dec. 6, 2024
** Internet service provider appoints insider Brian Maher as group CEO to replace the retiring Phillip Britt
** Maher joined as finance head in 2019, steered ABB to an ASX listing in 2020
** Stock set for fourth straight sessions of gains; trading volume at 2.8x the 30-day avg
** Stock fell by 8.2% last year
(Reporting by Kumar Tanishk in Bengaluru)
((Tanishk.Kumar@thomsonreuters.com;))