Justin Benincasa
Analyst · Raymond James
Great. Thanks, Michael. As a reminder, all the financials we'll be mentioning during today's call can be found in our accompanying slide presentation that we've added to our website, along with some additional financial tables.
ATN's Q3 revenues grew 5% to $191 million, highlighting the steady momentum we've built as a result of our network investments in the past few years. Fixed broadband revenue was the strongest contributor to our top line growth, followed by carrier services and mobility.
Moving down the P&L. Operating income grew to $6.8 million from $1.4 million in the prior year. Adjusted EBITDA grew 10% to $47.8 million, driven by the strong performance in our domestic businesses. The total net loss for the quarter was $3.6 million or $0.31 per share compared to a net loss of $2.8 million or $0.25 per share in Q3 of 2022. The higher net loss in the quarter was primarily driven by a $5.8 million increase in interest expense offsetting the $5.4 million increase in operating income.
Looking at the segment performance for the quarter. The International segment revenues grew 4% to nearly $94 million, while adjusted EBITDA was down slightly to $27.5 million. Operating expenses for the segment were unusually high in the quarter for a number of reasons including the addition of sales support resources that are helping drive the stronger subscriber and revenue growth. We also saw elevated expenses in a few other operating categories, including regulatory fees, and we expect those costs will come down in the coming quarters. For the first time, we exceeded 400,000 international mobile subscribers while also delivering strong high-speed broadband subscriber growth. As I mentioned, subscriber growth was helped by the increased on-the-ground operation support that are capitalizing on the investments we've made to expand and upgrade our network.
Mobile churn was up in the quarter as expected, resulting from the wind down of the temporary COVID-related MiFi program supported by the education department in the Virgin Islands.
Turning to the Domestic segment. Revenues grew 5% or $5 million to $97 million in the quarter. The increase reflected the strong performance of fixed and carrier service revenue growth, driven by increased enterprise and emergency connectivity fund revenue in Alaska and by the acquisition of Sacred Wind. As expected, this was slightly offset by a reduction in legacy roaming and construction revenues. Adjusted EBITDA in the segment rose 22% or nearly $5 million to $26.9 million. The strong EBITDA performance was driven by higher revenues and several ongoing cost reduction initiatives. As we mentioned in the last 2 quarters, ATN is focused on rightsizing the cost structure necessary to support the business into the future and improve overall operating margins.
As a result, we recorded a $1.4 million restructuring cost in the quarter and $4.6 million year-to-date, reflecting mainly costs associated with decommissioning network and reduction in force expenses. We expect the majority of our operational review to be complete in the fourth quarter and do not anticipate any further restructuring costs into 2024.
Looking now at capital expenditures. Year-to-date, through September 30, we invested $126.6 million, net of $14.3 million in reimbursable costs, consistent with our Glass and Steel and First-to-Fiber strategies. We're on track to be within our 2023 CapEx guidance for spending between $160 million and $170 million. Within the U.S. segment, CapEx spending during Q3 was $18.4 million. That was primarily related to fiber expansion in Alaska and the Lower 48. Internationally, CapEx spending was $18.7 million in Q3, which focused on the continuing fiber deployment in Guyana.
In our earnings news release issued yesterday afternoon, we provided preliminary full year 2024 outlook. Our preliminary '24 adjusted EBITDA outlook anticipates a range of between $200 million to $208 million and our preliminary CapEx spending outlook anticipates a range of $120 million to $130 million. The increase in adjusted EBITDA, combined with the slower pace in our network investments will increase free cash flow as we move into 2024. Consistent with past guidance, our CapEx guidance is net of reimbursable expenses. While ATN is slowing down its rate of capital expenditures going into 2024, we expect the grants we received and expect to receive will further expand our network investments and ultimately extend our network reach and revenue potential.
Turning to other balance sheet and cash flow highlights. We ended the quarter with cash and cash equivalents of $73 million and net cash provided by operating activities was $89.5 million year-to-date. At the end of the third quarter, our total debt outstanding was $498 million and our consolidated net debt to adjusted EBITDA ratio remained at 2.3x. As we move into 2024 and expand free cash, we expect to maintain a healthy leverage ratio and financial flexibility. And with that, I'll hand it back to Michael.