The healthcare sector, as measured by the XLV ETF, experienced a significant -6.44% drop in the after-hours session. This follows a regular session that saw some profit-taking in major components like Eli Lilly. Despite extensive searches, no specific, material news event has emerged during the after-hours session that would account for a move of this magnitude. It is possible the decline represents a continuation of negative sentiment from the regular trading day, potentially amplified by broader market concerns or algorithmic trading in a less liquid after-hours market. No definitive catalyst has been identified.