** U.S. truck maker’s shares up 22.7% at $43.45
** Traton says it matches NAV’s demand of $44.50/share to buy the portion of NAV that Volkswagen unit Traton does not already own
** Last month, Traton sweetened its January bid by $8 to $43 per share in an attempt to raise its ~16.8% stake in Navistar acquired in 2016
** NAV stock up 22.3% this year, as of last close (Reporting by Shreyasee Raj and Aaron Saldanha in Bengaluru)
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