Sources: CP staff; S&P Dow Jones Indices LLC, New York City
Martin Marietta Materials Inc. will gain elevated stature on Wall Street as it absorbs Texas Industries Inc., and switches spots from the Standard & Poors MidCap 400 to S&P 500 Index with one of the 20th century’s corporate icons, United States Steel Corp.—a past cement (Universal Atlas) and aggregate (Presque Isle, Mich., mega-quarry) operator in its own right.
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