A coupled polymer product comprising polymer with up to four polymer chains bonded to a functionalizing compound of formula II: N≡C-(Q)-Si(X 1 )(X 2 )(X 3 ) wherein Q is divalent and selected from C 1 -C 12 aliphatic divalent hydrocarbon and C 6 -C 18 aromatic hydrocarbon, each X is independently selected from halogens and optionally one X is selected from C 1 -C 12 aliphatic hydrocarbyl and C 6 -C 18 aromatic hydrocarbon, the polymer chains comprising (a) at least one conjugated diene-containing monomer optionally in combination with at least one vinyl aromatic monomer, and (b) at least one vinyl group-functionalized silane compound of formula I bonded within the polymer chain via its vinyl group wherein formula I is as follows: (H 2 C=CH)-(A) a -Si(R 1 )(R 2 )(R 3 ) wherein a is an integer of 0 or 1, A is divalent and selected from C 6 -C 20 aromatic hydrocarbons optionally substituted with alkylene to which the Si is bonded, each of R 1 , R 2 , and R 3 are independently selected from linear or branched C 1 -C 12 hydrocarbyl and -N(R 4 )(R 5 ), with at least one of R 1 , R 2 and R 3 selected from -N(R 4 )(R 5 ), wherein each R 4 and R 5 are independently selected from aliphatic hydrocarbyl of C 1 -C 12 or aromatic hydrocarbyl of C 6 -C 18 , with R 4 and R 5 optionally bonded together into a ring, and with R 1 and R 2 optionally bonded together into a ring comprising two nitrogen atoms, wherein the average number of vinyl group-functionalized aminosilane compound of formula I per polymer chain is 0.1:1 to 3:1, and 60 to 95% by weight of the coupled polymer product has 2 to 4 polymer chains bonded to each functionalizing compound of formula II. polymer with up to four polymer chains bonded to a functionalizing compound of formula II: N≡C-(Q)-Si(X 1 )(X 2 )(X 3 ) wherein Q is divalent and selected from C 1 -C 12 aliphatic divalent hydrocarbon and C 6 -C 18 aromatic hydrocarbon, each X is independently selected from halogens and optionally one X is selected from C 1 -C 12 aliphatic hydrocarbyl and C 6 -C 18 aromatic hydrocarbon, the polymer chains comprising (a) at least one conjugated diene-containing monomer optionally in combination with at least one vinyl aromatic monomer, and (b) at least one vinyl group-functionalized silane compound of formula I bonded within the polymer chain via its vinyl group wherein formula I is as follows: (H 2 C=CH)-(A) a -Si(R 1 )(R 2 )(R 3 ) wherein a is an integer of 0 or 1, A is divalent and selected from C 6 -C 20 aromatic hydrocarbons optionally substituted with alkylene to which the Si is bonded, each of R 1 , R 2 , and R 3 are independently selected from linear or branched C 1 -C 12 hydrocarbyl and -N(R 4 )(R 5 ), with at least one of R 1 , R 2 and R 3 selected from -N(R 4 )(R 5 ), wherein each R 4 and R 5 are independently selected from aliphatic hydrocarbyl of C 1 -C 12 or aromatic hydrocarbyl of C 6 -C 18 , with R 4 and R 5 optionally bonded together into a ring, and with R 1 and R 2 optionally bonded together into a ring comprising two nitrogen atoms, A is divalent and selected from C 6 -C 20 aromatic hydrocarbons optionally substituted with alkylene to which the Si is bonded, each of R 1 , R 2 , and R 3 are independently selected from linear or branched C 1 -C 12 hydrocarbyl and -N(R 4 )(R 5 ), with at least one of R 1 , R 2 and R 3 selected from -N(R 4 )(R 5 ), wherein each R 4 and R 5 are independently selected from aliphatic hydrocarbyl of C 1 -C 12 or aromatic hydrocarbyl of C 6 -C 18 , with R 4 and R 5 optionally bonded together into a ring, and with R 1 and R 2 optionally bonded together into a ring comprising two nitrogen atoms, wherein the average number of vinyl group-functionalized aminosilane compound of formula I per polymer chain is 0.1:1 to 3:1, and 60 to 95% by weight of the coupled polymer product has 2 to 4 polymer chains bonded to each functionalizing compound of formula II. <EOS>