** Life360's Australia-listed shares fall as much as 8.5% to A$20.82, heading for their worst session since early September - if current losses hold

** Stock third-biggest loser on the benchmark ASX 200 index

** Technology platform provider says CEO Chris Hulls has sold part of his stake in co

** Sale amounted to 1.2% of total outstanding shares in co

** Hulls has about a 3.8% stake in Life360 after the sale

** Stock hits lowest level since Oct. 14

** Stock up about 181% YTD, including current session's moves, lagging behind an 8.8% gain on the ASX 200 index

(Reporting by Nikita Maria Jino in Bengaluru)

((Nikita.Jino@thomsonreuters.com;))