Why Is SMX (Security Matters) Public Limited Company ( $SMX) Stock Down -25.32% Today? (Find out why any stock moved today on Tickeron.) Shares plunged 25.32% in mid-morning trading, falling from a prior close of $6.16 to roughly $4.60. The decline reversed an after-hours spike of more than 38% that followed a burst of company-issued promotional releases on its "trueGold" and "Made in America" technology. Structural concerns—chronic dilution, repeated reverse stock splits, and a going-concern warning—continue to weigh on sentiment. The move was company-specific, sharply diverging from a broadly flat Nasdaq and its industrial peer group. $NSSC $SFHG $SPIR $GRNQ $AERT