Brian Olsavsky
Chief Financial Officer at Amazon.com
Thank you for joining today's call. As Dave mentioned earlier. I'm joined today by Andy Jassy, our CEO. Before we move on to take your questions, I'll make some comments regarding our Q1 results. Let's begin with revenue. For the first-quarter, our worldwide net sales were $127.4 billion, up 9% year-over-year, or 11% excluding approximately 210 basis-points of unfavorable impact from changes in foreign-exchange rates. This was above the top-end of our guidance range.
Overall, we are pleased with the growth that we're seeing in worldwide stores businesses, including quarter-over- quarter revenue acceleration in the international segment, which was helped by easing macroeconomic pressures in Europe. Across the geographies we serve, customers appreciate our focus on staying sharp on pricing, having strong selection and easier and easier convenience, including delivery speeds, which continued to improve throughout the first-quarter.
That said, the uncertain economic environment and ongoing inflationary pressures continue to be a factor, and we believe it's continuing to drive cautious spending across consumers. This means our customers are looking to stretch their budgets further, and are focused on value. Some moderated spending on discretionary categories, as well as shifts to lower-priced items, and healthy demand in everyday essentials, such as consumables and beauty.
Third-party sellers, including businesses who like to utilize Fulfillment by Amazon for their storage and shipping services, are key contributor to the selection offered to customers. We also continue to invest meaningfully in brand protection efforts, including industry-leading technology, so that sellers can trust we will provide a great selling experience, free from bad actors. Sellers comprised 59% of overall unit sales in Q1, up from 55% one year-ago.
We also saw strong engagement in our advertising services, with revenue up 23% year-over-year, excluding the impact from changes in foreign-exchange rates. In particular, our sponsored product and brand offerings remain a key driver of growth as we work with advertisers to help customers make more informed purchase decisions. Our teams remain focused on delivering performance to our comprehensive and flexible measurement capabilities, along with insights that allow advertisers the ability to measure their return on their advertising spend and help them grow their business.
In AWS, net sales were $21.4 billion in the first-quarter, up 16% year-over-year and representing an annualized sales run-rate of more than $85 billion. Given the ongoing economic uncertainty, customers of all sizes and all industries continue to look for cost-savings across their businesses, similar to what you've seen us doing at Amazon. As expected, customers continue to evaluate ways to optimize their cloud spending in response to these tough economic conditions in the first-quarter and we are seeing these optimizations continue into the second-quarter, with April revenue growth rates about 500 basis-points lower than what we saw in Q1.
As a reminder, we're not trying to optimize for any one quarter or year, we're working to build customer relationships and a business that will outlast all of us. Therefore, our AWS sales and support teams continue to spend much of their time helping customers optimize their AWS spend, so they can better weather this uncertain economy. This customer orientation is built into our DNA and how we think about our customer relationships and business over the long-term.
Now, let's shift to worldwide operating income. For the first-quarter, we reported $4.8 billion in operating income above the top-end of our guidance range. This operating income was negatively impacted by an estimated employee severance charge of approximately $470 million in Q1, including $270 million related to AWS. As we finalized our annual planning process and considered the ongoing economic environment, we made the difficult decision to eliminate 9,000 roles, impacting our AWS business, as well as Twitch, devices, advertising and our human resources teams.
In Q1, our year-over-year growth in stores revenue and unit sales outpaced growth in both our fulfillment expense and our outbound shipping costs. Inflationary pressures continue to ease quarter-over-quarter, primarily driven by reductions in linehaul shipping rates, as well as lower diesel fuel and electricity costs. We also built on the progress we made throughout 2022 in improving productivity in our fulfillment network, through continued process and tech improvements. We exited Q4 with a good balance of labor throughout the network and leveraged that throughout Q1, with customer demand patterns remaining more stable compared to Q1 of last year.
As labor availability has stabilized and inventories supply-chain challenges have moderated, we were able to implement some significant structural changes to transition our US fulfillment network to a regionalized model. We believe these improvements put us in a good position to improve both delivery speed and our cost-to-serve customers overtime. We reported overall net income of $3.2 billion in the first-quarter, while we primarily focus our comments on operating income, I'd point out that this net income includes a pre-tax valuation loss of $467 million, included in non-operating expense from our common stock investment in Rivian Automotive. As we've noted in recent quarters, this activity is not related to Amazons ongoing operations, but rather to quarter-to-quarter fluctuations in Rivian stock price.
Turning to cash flows. We remain focused on building long-term sustainable growth in free cash flow, including our efforts towards a strong cash flow accretive working capital cycle. Our operating cash flow for the trailing 12 months, ended March 31, increased to $54.3 billion, up 38% versus the comparable period year-over-year. Besides the cash benefit of improved profitability year-over-year, we've also seen supply chains easing up and made progress to improve our inventory purchasing and payment cycles, which in-turn has a positive impact on working capital.
Now let's turn to our capital investments. We define our capital investments as the combination of capex plus equipment finance leases. For the full-year 2023, we expect capital investments to be lower than our $59 billion investment level in 2022, primarily driven by an expected year-over-year decrease in fulfillment network investments. We're continuing to invest in infrastructure to support AWS customer needs, including investments to support large language models and generative AI.
Before we open the call up for your questions, I'll hand it over to Andy to share some high-level perspectives on the first-quarter.