** Building materials supplier Summit Materials' shares
SUM.N fall 8.5% to $32.93
** Stock on track for biggest single-day percentage loss
since July 2022, if losses hold
** Co enters deal to combine with Cementos Argos S.A.'s
CCB.CN U.S. arm Argos USA in a $3.2 bln cash-and-stock deal
** Summit Materials to pay $1.2 bln in cash to Cementos
Argos along with 54.7 mln shares of Summit stock
** Cementos Argos to own about 31% of the combined co after
deal
** Co says the deal will create the fourth-largest cement
platform in the U.S.
** Summit CEO Anne Noonan will lead combined company, will
continue to trade on the NYSE under the ticker symbol 'SUM'
** SUM up 16% YTD, including session losses
(Reporting by Purvi Agarwal in Bengaluru)
((Purvi.Agarwal@thomsonreuters.com))