1940s To 1970s
Portrush won the Irish Junior Cup for the second time in 1943, a feat that was repeated in 1946.
Senior status was granted in 1947, and was marked by the club winning the Kirk Cup and the Ulster Section of the Irish Senior Cup.
The Anderson Cup was won for the first time in the 1949-50 season.
In the 1957-58 Portrush tied a Test Match against Banbridge and both were declared joint winners of the Keightley Cup for the Ulster Senior League champions.
In 1963-64, Portrush beat Lisnagarvey in the Ulster Final of the Irish Senior Cup, but went on to lose to Cork Church of Ireland in the all-Ireland semi-final.
The following year, 1964–65, was the club's most successful year. Portrush won the Anderson Cup for the third time and they also beat Banbridge in the Kirk Cup Final. In addition, the Final of the Irish Senior Cup was reached for the only time in Club history. After a 1-1 draw in Belfast, Portrush lost after extra time to Dublin YMCA in the replay.
The Kirk Cup success in 1969-70 was the last time that Portrush would win a Senior trophy.
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