▁ ▁Category : My rm ic inae ▁Category : In sect s ▁described ▁in ▁ 1 8 9 0 <0x0A> </s> ▁US G ▁Corporation , ▁also ▁known ▁as ▁United ▁States ▁Gy psum ▁Corporation , ▁is ▁an ▁American ▁company ▁which ▁manufact ures ▁construction ▁materials , ▁most ▁not ably ▁dry wall ▁and ▁joint ▁comp ound . ▁The ▁company ▁is ▁the ▁largest ▁distrib utor ▁of ▁wall board ▁in ▁the ▁United ▁States ▁and ▁the ▁largest ▁manufact urer ▁of ▁gy psum ▁products ▁in ▁North ▁America . ▁It ▁is ▁also ▁a ▁major ▁consumer ▁of ▁synth etic ▁gy psum , ▁a ▁by product ▁of ▁fl ue - gas ▁des ulf ur ization . ▁Its ▁corpor ate ▁offices ▁are ▁located ▁at ▁ 5 5 0 ▁West ▁Adams ▁Street ▁in ▁Chicago , ▁Illinois . ▁ ▁T ogether ▁with ▁other ▁construction ▁products , ▁US G ' s ▁most ▁significant ▁br ands ▁are : ▁▁ ▁She et rock ▁Brand ▁Gy psum ▁Pan els ▁ ▁Sec uro ck ▁Brand ▁G lass - Mat ▁She ath ing ▁ ▁She et rock ▁Brand ▁All ▁Pur pose ▁J oint ▁Comp ound ▁ ▁In ▁December ▁ 2 0 1 3 , ▁Warren ▁Buff ett ' s ▁Ber k shire ▁H ath away ▁became ▁the ▁largest ▁share holder ▁in ▁the ▁company ▁( hold ing ▁roughly ▁ 3 0 %) ▁when ▁it ▁converted ▁US G ▁convert ible ▁notes ▁it ▁had ▁acquired ▁in ▁ 2 0 0 8 ▁to ▁common ▁stock . ▁ ▁In ▁June ▁ 2 0 1 8 , ▁US G ▁entered ▁into ▁an ▁agreement ▁to ▁be ▁purchased ▁by ▁the