Barry Hytinen
Executive Vice President and Chief Financial Officer at Iron Mountain
Thanks, Bill, and thank you all for joining us to discuss our results. I'll begin by providing an overview of our second quarter results and then go into more detail on each of our business segments before turning to our outlook for the third quarter and the full year.
In the second quarter, our team achieved strong performance across all of our key financial metrics. We achieved record revenue of $1.534 billion, up 13% on a reported basis, driven by 11% storage growth and 17% service growth. We delivered 10% organic revenue growth. Revenue was ahead of the expectations we shared on our last call by more than $30 million. Total storage revenue was $920 million, up $89 million year-on-year.
Storage growth was driven by revenue management and continued strong commencements in our data center business. Total service revenue was $615 million, up $87 million from last year, driven by strength in our asset life cycle management and Global RIM businesses. Adjusted EBITDA was $544 million, a new record, up 14% year-on-year, driven by strong growth in Global RIM as well as data center and asset life cycle management. Adjusted EBITDA margin was 35.5%, up 50 basis points year-on-year, which reflects improved margins across our business.
AFFO was $321 million or $1.08 on a per share basis, up $34 million and $0.10 respectively, from the second quarter of last year. This represents growth of 12% for AFFO and 10% for AFFO per share. This is ahead of the guidance we provided for the second quarter, driven by higher adjusted EBITDA as well as lower-than-expected cash taxes, which is included in our guidance for the third quarter. The strength of the U.S. dollar continued to be a headwind in the quarter. On a constant currency basis, revenue was up 14% and AFFO was up 13%.
Now turning to segment performance. I'll start with our Global RIM business, which achieved revenue of $1.25 billion, an increase of $91 million year-on-year with strong organic revenue growth of 7.9%. Revenue management and positive volume trends drove organic storage rental growth of 7.7%. Our team delivered organic service revenue up 8.3%.
Global RIM adjusted EBITDA was $549 million, an increase of $50 million year-on-year. Global RIM adjusted EBITDA margin was up 40 basis points sequentially and 90 basis points from last year, driven by storage growth and continued productivity across our operations.
Turning to Global Data Center. The team delivered revenue of $153 million, an increase of $35 million year-on-year. From a total revenue perspective, we achieved 24% organic growth. Organic storage rental revenue growth was particularly strong at 27%, driven by commencements and improved pricing. GAAP mark-to-market in the second quarter was 12.3% and was benefited by a single relatively large renewal. We continue to expect mark-to-market to be up mid-to-high single digit in the second half.
Data center adjusted EBITDA was $66 million, representing 23% growth.
Turning to new and expansion leasing, we signed 66 megawatts in the quarter, bringing total bookings for the first half to 97 megawatts. As Bill mentioned, with our strong leasing and favorable outlook, we are increasing our full year projection to 130 megawatts. The data center market continues to develop rapidly. And with our strong and expanding hyperscale relationships, our pipeline continues to grow. I am pleased to report that we have increased our land bank by 57 megawatts. With those additions, our total data center capacity can now be built out to 918 megawatts over time with 347 megawatts held for development.
Turning to asset life cycle management. Total ALM revenue in the quarter was $90 million, an increase of 111% year-on-year and 30% on an organic basis, driven by both improved volume and pricing. ALM continues to be a key beneficiary of cross-selling with over 95% of our bookings this quarter happening as a result of that initiative. The team at Regency Technologies continues to deliver results ahead of our plan, with revenue of $35 million in the quarter. We have seen our combination with Regency results in expanded client relationships and improved profitability.
Turning to capital allocation. We remain focused on a disciplined approach to fund our growth initiatives and drive meaningful shareholder returns while maintaining a strong balance sheet. Capital expenditures in the second quarter were $399 million, with $362 million of growth and $37 million of recurring.
Turning to the balance sheet. With strong EBITDA performance, we ended the quarter with net lease adjusted leverage of 5.0 times, which is the lowest level we have achieved since prior to the company's REIT conversion in 2014.
Turning to our dividend. On a trailing 4-quarter basis, our payout ratio is now 60%. Consistent with our target payout range and reflecting our positive outlook, we have increased our dividend 10%.
Now turning to our projections. For the full year, we now expect to deliver results towards the high end of our guidance range on all metrics. For the third quarter, we expect revenue of approximately $1.55 billion, adjusted EBITDA of approximately $560 million, AFFO of approximately $325 million, and AFFO per share of approximately $1.10.
In conclusion, our team delivered record results in the first half. We continue to perform ahead of our long-term growth objectives and our outlook is strong. I'd like to take this opportunity to thank all of our Mountaineers for their continued efforts to deliver on behalf of our customers.
And with that, operator, would you please open the line for Q&A.