Good morning. My name is Conesia and I will be your conference operator today. At this time, I'd like to welcome everyone to the Broadridge Third Quarter Fiscal Year 2018 Earnings Conference Call. All lines have been placed on mute to prevent any background noise. After the speakers' remarks, there will be a question-and-answer session. (Operator Instructions) Thank you. I would like to turn the conference over to Mr. Edings Thibault, Head of Investor Relations. Sir, you may begin.
Thank you, Conesia. Good morning, everybody, and welcome to Broadridge's third quarter 2018 earnings conference call. Our earnings release and the slides that accompany this call may be found on the Investor Relations section of broadridge.com.
Joining me on the call this morning are Rich Daly, our CEO; Tim Gokey, our President and Chief Operating Officer; and Jim Young, our Chief Financial Officer.
Before I turn the call over to the management team, a few standard reminders. During today's conference call, we will be making forward-looking statements regarding Broadridge that involve risks. A summary of these risks can be found on the second page of the slides. We encourage participants to refer to our SEC filings including our Annual Report on Form 10-K for a complete discussion of forward-looking statements and risk factors faced by our business. We will also be referring to several non-GAAP financial measures, including adjusted operating income, adjusted EPS, and free cash flow.
We believe these non-GAAP metrics provide investors with a more complete understanding of Broadridge's underlying operating results. An explanation of our use of these non-GAAP measures and reconciliations to the comparable GAAP measures can be found in the earnings release and in the earnings presentation.
Let me now turn the call over to Rich Daly. Rich?
Thanks, Edings. Good morning to all of you joining us on this call. I'm delighted to report another strong quarter for our business. And with only two months to go before year-end, I'm also pleased to note that Broadridge is firmly on track to deliver strong full year 2018 results as well. I'll begin this morning with the highlights of our third quarter earnings on Slide 5. Tim will then discuss the performance of our two segments, and Jim will review our financials and walk you through our outlook for fiscal 2018, including the drivers behind the increase in our adjusted EPS guidance.
I will then close with some additional thoughts on how we are balancing, delivering attractive, short-term results, while investing for the long-term. So let's get started. Broadridge reported strong third quarter results. Total revenues rose 6% to $1.1 billion, driven by recurring fee revenue growth of 8% and, to a lesser extent, by 9% growth in event-driven revenues.
Strong organic recurring revenue growth resulted in a 13% increase in adjusted operating income and a 90-basis-point increase of margin expansion. Broadridge's adjusted EPS was also helped by a tax benefit related to equity compensation and the reduction in corporate tax rates, which further contributed to a 45%