Ron Bruehlman
Executive Vice President and Chief Financial Officer at IQVIA
Thanks, Ari, and good morning, everyone. Let's start by reviewing revenue. Second quarter revenue of $3,728 million grew 5.3% on a reported basis and 5.5% constant currency. In the quarter, COVID related revenues were approximately $120 million which is down about $140 million versus the second quarter of 2022. Excluding all COVID related work from both this year and last, organic growth at constant currency was 9%. Technology & Analytics Solutions revenue was $1,456 million that was up 3.4% on both a reported and constant currency basis, excluding all COVID related work, organic growth at constant currency in TAS with 6%. R&D Solutions revenue of $2,096 million was up 7.5% reported and 7.6% at constant currency, excluding all COVID related work, organic growth at constant currency in R&DS was 12%.
Lastly, Contract Sales & Medical Solutions or CSMS revenue of $176 million declining 3.8% reported and was flat at constant currency. However, company first half revenue was $7,380 million which was up 3.8% on a reported basis and 5.1% at constant currency, excluding all COVID related work organic growth at constant currency for the first half was 10%.
Technology & Analytics Solutions revenue for the first half was $2,900 million, that's up 1.9% reported in 3.2% at constant currency, excluding all COVID related work organic growth at constant currency in TAS with 6% for the first half.
R&D Solutions first half revenue of $4,122 million was up 6.1% at actual FX rates and 7.1% at constant currency, excluding all COVID related work organic growth at constant currency in R&DS was 14% in the first half.
Contract Sales & Medical Solutions or CSMS first half revenue of $358 million declined 5.3% reported and 0.5% constant currency. If you note down the P&L now, adjusted EBITDA was $864 million for the second quarter, which represented growth of 8% while first half adjusted EBITDA was $1,715 million which was up 6.4% year-over-year. Second-quarter GAAP net income was $297 million and GAAP-diluted earnings per share was $1.59. For the first half, we had GAAP net income of $586 million or $3.12 of earnings per diluted share. Adjusted net income was $454 million for the second quarter and adjusted diluted earnings per share was $2.43. For the first half, adjusted net income was $916 million or $4.88 per share. Now excluding the year-over-year impact of the step-up in interest rates and the increase in the U.K. corporate tax rate, adjusted diluted earnings per share grew 14% in the second quarter and 11% for the first half. As already reviewed R&D Solutions delivered another quarter of excellent bookings backlog at June 30th stood at a record $28.4 billion, which is up 11% year-over-year and up approximately 40% in the last three years.
Reviewing the balance sheet as of June 30, cash and cash equivalents totaled $1,382 million and gross debt was $13,777 million which resulted in net debt of $12,395 million. Our net leverage -- leverage ratio ended the quarter 3.59 times trailing 12-month adjusted EBITDA. Second quarter cash flow from operations was $402 million and capital expenditures were $160 million resulting in free cash flow of $242 million. As we previously announced in May, we issued $1,250 million of senior secured and unsecured notes. The proceeds from these notes were used to pay down our revolving credit facility. We also took advantage during the quarter of our stock price multiples falling to 2017 levels and deployed $490 million to repurchase 2.5 million shares at an average price of $194 per share. In the first half share repurchases totaled $619 million. We ended the quarter with $736 million at share repurchase authorization remaining under the program -- our Board of Directors just authorized a $2 billion increase to our share repurchase plan, which brings the authorization to $2,736 million as of today.
Let's turn to the guidance. We are updating our guidance to address the impact of the continued client cautiousness we've been experiencing in the commercial business. We now anticipate this cautiousness persisting for the balance of the year and reflecting the reduced expectations for both TAS and CSMS. We currently expect revenue to be between $15,050 million and $15,175 million, which represents a year-over-year growth of 4.4% to 5.3%.
Total company organic growth at constant currency excluding COVID related work is now expected to be between 8% and 9% for the year. This revenue guidance continues to assume about 100 basis points of contribution from acquisitions and a step down in COVID related revenue of approximately $600 million versus 2022. TAS segment, we now expect TAS to grow approximately 6% consistent with what we saw in the first half. Our expectation for the R&DS segment are unchanged and consistent with our previous guidance and finally we now expect CSMS revenue to decline approximately 3% and all of these growth rates are organic at constant currency, excluding COVID related work. Now reflect these changes in revenue, we're also updating our guidance for full year adjusted EBITDA to $3,600 million to $3,635 million, which represents a year-over-year growth of 7.6% to 8.6%.
Lastly, we are updating our guidance for adjusted diluted EPS to $10.20 to $10.45 representing year-over-year growth of 0.4% to 2.9%. This adjusted diluted earnings per share guidance includes the year-over-year impact of the step-up in interest rates and the increase in the U.K. corporate tax rate and together these non-operational items reduced the year-over-year growth rate by approximately 12 percentage points. So excluding these items, adjusted diluted earnings per share is expected to grow well to 15%.
Let's move to our third quarter guidance. In Q3, we expect revenue to be between $3,760 million and $3,810 million or growth of 3.9% to 5.3% on a constant currency basis and 5.6% to 7% on a reported basis. Adjusted EBITDA is expected to be between $880 million and $895 million, up 8.1% to 10% and adjusted diluted EPS is expected to be between $2.39 and $2.49 declining 3.6% to growing 0.4% year-over-year. Excluding the step up in interest expense and the increase in the U.K. tax-rate this translates into third quarter adjusted diluted EPS growth of between 11% and 15%. Now, I should note that all of this guidance assumes that foreign currency rates as of July 31 continue for the balance of the year.
So let me summarize, we delivered another strong quarter of financial performance, including organic revenue growth of 9% excluding the impact of foreign exchange and COVID related work. Accordingly, net new bookings were the second highest ever at just under $2.7 billion and our industry leading backlog reached a new record of $28.4 billion up 11% year-over-year. Underlying demand in the industry and our business remains healthy with a RFP flow reaching a new record high in the quarter up 6% sequentially versus Q1 2023.
We took advantage of the stock price multiple spilling to 2017 levels during the quarter and bought back almost a $0.5 billion worth of shares at an average of $194 per share. On top of this, our Board of Directors authorized a $2 billion increase to our share repurchase authorization and finally while client cautiousness in their discretionary spending is slightly reduced our short term outlook on the commercial side of the business that is TAS and CSMS.
The fundamentals of both the clinical and commercial markets continued to be healthy and support our confidence in the longer term outlook for our company. And with that, let me hand it back over to the operator to open the phones for Q&A.