In 1941, the school put up a benefit program at the Rizal Stadium to raise more funds to help cover the cost of new construction.

St. Stephen's Girls' School offered its service to those unschooled for five years as contribution to the community and nation-building.

The school has varsity teams in swimming, track and field, volleyball, badminton, table tennis and basketball.

It hosted the 37th Season of the Women's National Collegiate Athletic Association (WNCAA) with the theme "Victory Beyond Competition."

The school has served as host for training sessions held by the Mathematics Trainers' Guild (MTG) for several years.

The school celebrated its historic 90th founding anniversary on July 22, 2007 with the theme "God's Glory with Exceeding Joy!"

In celebration, St. Stephen's held its first Inter-school Extemporaneous Speech Competition, its first Earth Science Quiz, and three concerts: one in cooperation with the Biblical Seminary of the Philippines titled "An Evening of Praise," featuring the Heavenly Melody Singers from Taiwan; a Thanksgiving concert titled "Images of Christ" in November 2007, directed by New York-based conductor Celia Yu Ong and famed director Chinggoy Alonso; and the Thanksgiving marimba concert, featuring alumnus Johnny Yu, Prof. Raul Sunico of the UST Conservatory of Music.