Craig Safian
CFO at Gartner
Thank you, Gene, and good morning. First quarter financial results were better than planned with particular strength in profitability and free cash flow. We remain well positioned for the global CV growth rate to accelerate from the first or second quarter of this year. We are increasing our revenue, profit and free cash flow guidance on an operating basis and updating for the stronger U.S. dollar. We have a lot of capacity for share repurchases and remain eager to buy back stock opportunistically.
First quarter revenue was $1.5 billion, up 5% year-over-year as reported and FX neutral. In addition, total contribution margin was 69%, about in line with last year. EBITDA was $382 million, ahead of our guidance and up modestly from first quarter 2023. Adjusted EPS was $2.93, up 2% from Q1 of last year. And free cash flow was $166 million.
Research revenue in the first quarter grew 4% year-over-year as reported and on an FX-neutral basis. Subscription revenue grew 6% FX-neutral. Non-subscription revenue was similar to Q4 2023 following changes we made during the fourth quarter, which we discussed in February. First quarter Research contribution margin was 74%, consistent with last year.
Contract value, or CV, was $4.9 billion at the end of the first quarter, up 7% versus the prior year and down about $10 million from the fourth quarter of 2023. The NCVI results reflect the higher-than-normal level of tech vendor contracts up for renewal, which we discussed in February. In addition, Q1 is our seasonally smallest quarter for new business. CV from enterprise function leaders across GTS and GBS grew 10%. CV growth is FX neutral. CV growth outside of our tech vendor client base was broad-based across practices, industry sectors, company sizes and geographic regions.
Across our combined practices, the majority of industry sectors grew at double-digit or high single-digit rates led by the energy, manufacturing and public sectors. CV grew double-digit or high single-digit rates across all enterprise sizes except small, which was about flat and has the largest tech-vendor mix. We also drove double-digit or high single-digit growth in the majority of our top 10 countries.
Global Technology Sales contract value was $3.8 billion at the end of the first quarter, up 5% versus the prior year. GTS enterprise leader CV increased high single digits. Tech vendor CV was down slightly year-over-year. GTS CV was $22 million lower than the fourth quarter. Wallet retention for GTS was 101% for the quarter, which compares to 104% in the prior year. Enterprise leader wallet retention was consistent with historical levels. As expected, tech vendors were the key driver of the change year-over-year.
GTS new business was 1% lower than last year even as enterprise leader new business increased year-over-year. GTS quota-bearing headcount was down 2% year-over-year. We continue to expect mid-single-digit QBH growth by the end of the year. The near-term hiring focus is in the enterprise leader portion of the business. Our regular full set of GTS metrics can be found in our earnings supplement.
Global Business Sales contract value was $1.1 billion at the end of the first quarter, up 12% year-over-year. All of our GBS practices grew at double-digit or high single-digit rates other than sales, which grew mid-single digits. Growth was led by finance, legal and supply chain. GBS CV increased $12 million from the fourth quarter, while retention for GBS was 107% for the quarter, which compares to 110% in the prior year.
GBS new business was up 7% compared to last year. GBS quota-bearing headcount was also up 7% year-over-year. As with GTS, our regular full set of GBS metrics can be found in our earnings supplement. Conferences revenue for the first quarter was $70 million, modestly ahead of our expectations during a seasonally small period. We had two successful launches in the quarter: Our CFO and Finance Executive Conference in Australia and our Data and Analytics Summit in Brazil. Contribution margin in the quarter was 33%, consistent with typical seasonality and reflecting investments for future growth. We held 12 destination conferences in the quarter.
First quarter Consulting revenues increased by 6% year-over-year to $135 million. On an FX-neutral basis, revenues were up 7%. Consulting contribution margin was 40% in the first quarter. Labor-based revenues were $109 million, up 12% versus Q1 of last year's reported and 13% on an FX-neutral basis. Backlog at March 31 was $188 million, increasing 17% year-over-year on an FX-neutral basis with continued booking strength. Our contract optimization business is highly variable. We delivered $26 million of revenue in the quarter against a tough prior year compare.
Consolidated cost of services increased 6% year-over-year in the first quarter as reported and 5% on an FX-neutral basis. The biggest driver of the increase was higher compensation costs. SG&A increased 5% year-over-year in the first quarter as reported and on an FX-neutral basis. SG&A increased in the quarter as a result of headcount growth and higher compensation costs. EBITDA for the first quarter was $382 million, up modestly from last year. First quarter strength compared to our guidance reflected modest revenue upside, effective expense management and a prudent approach to our initial guidance. Depreciation in the quarter of $26 million was up about 10% compared to 2023.
Net interest expense, exclusive financing costs in the quarter was $18 million. This is favorable by $9 million versus the first quarter of 2023 due to higher interest income on our cash balances. The modest floating rate debt we have is fully hedged through the third quarter of 2025. The Q1 adjusted tax rate, which we use for the calculation of adjusted net income was 20% for the quarter. The tax rate for the items used to adjust net income was 25% for the quarter.
Adjusted EPS in Q1 was $2.93, up 2% compared with last year. We had 79 million shares outstanding in the first quarter. This is a reduction of close to 1 million shares or about 2% year-over-year. We exited the first quarter with about 79 million shares on an unweighted basis. Operating cash flow for the quarter was $189 million, up 15% compared to last year. Capex for the quarter was $23 million, up modestly year-over-year. Free cash flow for the quarter was $166 million. Free cash flow as a percent of revenue on a rolling 4-quarter basis was 18% of revenue and 72% of EBITDA. Free cash flow conversions from GAAP net income was 135%. Our free cash flow conversion is generally higher when CV growth is accelerating. At the end of the first quarter, we had about $1.2 billion of cash. Our March 31 debt balance was about $2.5 billion.
During the quarter, we closed on a new 5-year, $1 billion unsecured revolving credit facility. Outstanding borrowings from the existing credit agreement were rolled over into the new unsecured revolver. The amount drawn remains fully hedged. Our capital structure is now 100% unsecured. After Moody's upgraded our credit in April, we now have three investment grade ratings from Fitch, S&P and Moody's. Our reported gross debt to trailing 12-month EBITDA was under 2x. Our expected free cash flow generation, available revolver and excess cash remaining on the balance sheet provide ample liquidity to deliver on our capital allocation strategy of share repurchases and strategic tuck-in M&A.
Our balance sheet is very strong with $1.9 billion of liquidity, low levels of leverage and effectively fixed interest rates. We repurchased $225 million of our stock during the first quarter. We expect the Board will continue to refresh the repurchase authorization as needed going forward. At the end of March, we had about $830 million authorized for repurchases. As we continue to repurchase shares, our capital base will shrink. Over time, this is accretive to earnings per share and combined with growing profits also delivers increasing returns on invested capital.
We are raising our full year guidance on an FX-neutral basis to reflect Q1 performance. The dollar has gotten stronger since we reported in February, which is also incorporated into the guidance. For Research, we continue to innovate and provide a very compelling value proposition for clients and prospects. Executives and their teams face uncertainty and challenges, and they recognize how Gartner can help regardless of the economic environment. For Research revenue, based on Q1 results and our outlook for the balance of the year, our guidance on an FX-neutral basis is unchanged.
The guidance also reflects the CV growth rate reaccelerating this year. New business strength and improvements in retention would lead to upside to our guidance. And Research subscription revenue growth will likely lag CV growth reacceleration by about a quarter or 2 on an FX-neutral basis.
The non-subscription revenue outlook continues to reflect the shift to higher-quality traffic sources we discussed last quarter. We saw pricing stabilizing over the past few months. An improvement in pricing would represent upside to the guidance. The first quarter for Conferences is seasonally small. We continue to expect strong performance for the full year. We expect similar seasonality to what we saw in 2023 with Q4 the largest quarter, followed by Q2. For Consulting, we continue to see demand on our labor-based services in areas like digital transformation and cost optimization. Contract optimization has had several very strong years and is highly variable. We've incorporated a prudent outlook for this part of the segment.
For consolidated expenses, we are investing for future growth even as we have taken a balanced view of the timing of revenue flowing into the P&L. We recommend thinking about expenses sequentially with notable seasonality driven by the conferences calendar and merit increases. As a reminder, about a third of our revenue and operating expenses are denominated in currencies other than the U.S. dollar. With the strengthening dollar, we now expect FX-neutral growth to be higher than reported growth by about 0.5 point for revenue and around a full point for EBITDA for the full year.
Our updated 2024 guidance is as follows. We expect Research revenue of at least $5.115 billion, which is FX-neutral growth of about 5%. First quarter results were about in line with our expectations, we updated for the stronger dollar. We expect Conferences revenue of at least $560 million, which is FX-neutral growth of about 11%. We expect Consulting revenue of at least $525 million, which is growth of about 3% FX neutral. The result is an outlook for consolidated revenue of at least $6.2 billion, which is FX-neutral growth of 5%. We now expect full year EBITDA of at least $1.455 billion, up $35 million from our prior guidance before the effect of a stronger dollar. We expect typical operating expense seasonality to continue through the rest of the year. We now expect 2024 adjusted EPS of at least $10.90.
For 2024, we now expect free cash flow of at least $1.08 billion, up $15 million from our prior guidance. The higher free cash flow reflects a conversion from GAAP net income of 139%. Our guidance is based on 79 million fully diluted weighted average shares outstanding, which reflects the repurchases made through the end of March. And finally, for the second quarter, we expect adjusted EBITDA of at least $390 million.
Our financial performance started the year ahead of our plan despite continuing global macro uncertainty and a dynamic tech vendor market. CV grew high single digits in the quarter, and we expect CV growth to reaccelerate from the first or second quarter of this year. Revenue and EBITDA performance exceeded our expectations. We increased our operating guidance and incorporated the stronger U.S. dollar into the outlook. Free cash flow was strong in the quarter, and we increased the guidance for the full year.
We repurchased about $225 million in stock year-to-date through March and remain eager to return excess capital to our shareholders. We will continue to be price sensitive, opportunistic and disciplined. Looking out over the medium term, our financial model and expectations are unchanged. With 12% to 16 % Research CV growth, we will deliver double-digit revenue growth. With gross margin expansion, sales costs growing about in line with CV growth and G&A leverage, we will expand EBITDA margins modestly over time. We can grow free cash flow at least as fast as EBITDA because of our modest capex needs and the benefits of our clients paying us upfront. And we'll continue to deploy our capital on share repurchases, which will lower the share count over time and on strategic value-enhancing tuck-in M&A.
With that, I'll turn the call back over to the operator, and we'll be happy to take your questions.
Operator?