The NSPCC held the fundraiser in glorious sunshine on Sunday.
Not that the weather mattered to those taking part - their climb was firmly indoors, tackling the building's 1,308 steps.
And the fastest time was made by seasoned amateur runner Rich Sirrs, with an impressive four minutes, 23 seconds.
— Paul Spivey (@SpivDogg) September 6, 2015
Formally 30 St Mary Axe, the building is known for its familiar shape and hundreds of people took part in the event.
— NSPCC (@NSPCC) September 6, 2015
— Volker Breuer (@volkerbreuer) September 6, 2015
And celebrities through themselves into the challenge too. 'Countdown' presenter Rachel Riley completed it in just under nine minutes.