Why Martin Marietta stock just hit a record — and what basic materials traders watch next
New York, January 10, 2026, 13:49 EST — Market closed Shares of Martin Marietta Materials Inc jumped 4.6% on Friday, closing at a record $666.67 and thrusting the basic materials company back into the spotlight. Timing is crucial. Building materials shares are moving once more in sync with interest rates, as investors track mortgage expenses and shifts in U.S. policy just as closely as cement demand. President Donald Trump directed government-backed lenders Fannie Mae and Freddie Mac to buy $200 billion in mortgage bonds, Reuters reported, aiming to bring down mortgage rates. TD Cowen noted this move could shrink the