diff --git a/AUTHORS.md b/AUTHORS.md
index 9f4aeac421..38c55066ba 100644
--- a/AUTHORS.md
+++ b/AUTHORS.md
@@ -191,6 +191,7 @@ possible:
  * Paulo "JCranky" Siqueira
  * Pavel Chlupacek
  * Pavkin Vladimir
+ * Paweł Kiersznowski
  * Paweł Lipski
  * Pepe García
  * Pere Villega
diff --git a/core/src/main/scala/cats/SemigroupK.scala b/core/src/main/scala/cats/SemigroupK.scala
index f3ca1b5965..ef1e1042b1 100644
--- a/core/src/main/scala/cats/SemigroupK.scala
+++ b/core/src/main/scala/cats/SemigroupK.scala
@@ -67,4 +67,18 @@ import simulacrum.typeclass
     new ComposedSemigroupK[F, G] {
       val F = self
     }
+
+  /**
+   * Combines `F[A]` and `F[B]` into a `F[Either[A,B]]]`.
+   *
+   * Example:
+   * {{{
+   * scala> import cats.SemigroupK
+   * scala> import cats.data.NonEmptyList
+   * scala> SemigroupK[NonEmptyList].sum(NonEmptyList.one("abc"), NonEmptyList.one(2))
+   * res0: NonEmptyList[Either[String,Int]] = NonEmptyList(Left(abc), Right(2))
+   * }}}
+   */
+  def sum[A, B](fa: F[A], fb: F[B])(implicit F: Functor[F]): F[Either[A, B]] =
+    combineK(F.map(fa)(Left(_)), F.map(fb)(Right(_)))
 }