Caterpillar Inc $8,408,364 Global Brass & Copper Holdings, Inc. $274,938 Lockheed Martin Corp $1,977,837 United States Steel Corp $38,092,121 Caterpillar Inc $8,408,364 Global Brass & Copper Holdings, Inc. $274,938 Lockheed Martin Corp $1,977,837 United States Steel Corp $38,092,121