First half revenue has increased to $424.7 million, a rise on the prior comparative period (pcp) of $26 million. This equates to an increase of 6.5% on a like-for-like basis with a new accounting standard that took effect this financial year, and up 3.8% on a statutory basis, which is particularly pleasing given the pcp was a record half.
Expenses for the half were broadly on track with guidance, up $9 million to $105.2 million, which is an increase of 9.4%. As discussed at the 2018 full-year results, ASX is strengthening its foundations in risk management, technology and operations. I will talk about the significant progress we've made in a moment.
Notwithstanding this investment in resilience, ASX's EBITDA is up $17 million to $319.5 million, a rise of 5.6% on a likefor-like accounting basis and 2.1% on a statutory basis. Our EBITDA margin remains at 75% for the half.