Steven Nielsen
Analyst · UBS
Thanks, Ryan. Now moving to Slide 4 and a review of our fourth quarter results. As we review our results, please note that in our comments today and in the accompanying slides, we reference certain non-GAAP measures. We refer you to the quarterly report section of our website for a reconciliation of these non-GAAP measures to their corresponding GAAP measures.
Now for the quarter. Revenue was $917.5 million, an organic increase of 20.5%. As we deploy gigabit wireline networks, wireless/wireline converged networks and wireless networks, this quarter reflected an increase in demand from 4 of our top 5 customers. Gross margin was 16.5% of revenue and increased 278 basis points compared to the fourth quarter of fiscal 2022.
General and administrative expenses were 7.8% of revenue, and all of these factors produced adjusted EBITDA of $83.1 million or 9.1% of revenue and earnings per share of $0.83 compared to $0.03 in the year ago quarter. Liquidity was strong at $757.8 million, improving sequentially and operating cash flow was $246.2 million in the fourth quarter. During the quarter, we repurchased 210,000 shares of our common stock.
Now going to Slide 5. Today, major industry participants are constructing or upgrading significant wireline networks across broad sections of the country. These wireline networks are generally designed to provision gigabit network speeds to individual consumers and businesses either directly or wirelessly using 5G technologies. Industry participants have stated their belief that a single high-capacity fiber network can most cost effectively deliver services to both consumers and businesses, enabling multiple revenue streams from a single investment. This view is increasing the appetite for fiber deployments, and we believe that the industry effort to deploy high-capacity fiber networks continues to meaningfully broaden the set of opportunities for our industry.
Increasing access to high-capacity telecommunications continues to be crucial to society, especially in rural America. The Infrastructure Investment and Jobs Act includes over $40 billion for the construction of rural communications networks in unserved and underserved areas across the country. This represents an unprecedented level of support. In addition, substantially all states have commenced programs that will provide funding for telecommunications networks even prior to the initiation of funding under the Infrastructure Act.
We are providing program management, planning, engineering and design, aerial, underground and wireless construction and fulfillment services for gigabit deployments. These services are being provided across the country in numerous geographic areas to multiple customers. These deployments include networks consisting entirely of wired network elements and converged wireless/wireline multiuse networks.
Fiber network deployment opportunities are increasing in rural America as new industry participants respond to emerging societal initiatives. We continue to provide integrated planning, engineering and design, procurement and construction and maintenance services to several industry participants.
Macroeconomic conditions, including those impacting the cost of capital may influence the execution of some industry plans. In addition, the market for labor remains tight in many regions around the country. Automotive and equipment supply chains remain challenged, particularly for the large truck chassis required for specialty equipment.
Prices for capital equipment continued to increase. It remains to be seen how long these conditions may persist. We expect demand to continue to fluctuate amongst customers but are encouraged that several have newly initiated or reiterated their commitment to programs of significant size and duration. Within this context, we remain confident that our scale and financial strength position us well to deliver valuable service to our customers.
Moving to Slide 6. During the quarter, organic revenue increased 20.5%. Our top 5 customers combined produced 65.8% of revenue, increasing 24.4% organically. Demand increased from 4 of our top 5 customers. All other customers increased 13.6% organically. AT&T was our largest customer at 22.5% of total revenue or $206.6 million. This was our eighth consecutive quarter of organic growth with AT&T.
Lumen was our second largest customer at 12% of revenue or $110.3 million. Lumen grew organically 64.6%, excluding operations sold to Brightspeed from the year ago period. This was our fourth consecutive quarter of organic growth with Lumen.
Revenue from Comcast was $98.7 million or 10.8% of revenue. Comcast was Dycom's third largest customer. Frontier was our fourth largest customer at $97.5 million or 10.6% of revenue. Frontier grew 152.8% organically. And finally, Verizon was our fifth largest customer at $90.5 million or 9.9% of revenue. Verizon grew 17.6% organically. This was our second quarter of organic growth with Verizon.
This is the third consecutive quarter where our top 5 customers grew organically in excess of 20% and the 16th consecutive quarter where all of our other customers in aggregate, excluding the top 5 customers have grown organically. Of note, fiber construction revenue from electric utilities was $74.9 million in the quarter and increased 30.4% year-over-year.
We have extended our geographic reach and expanded our program management and network planning services. In fact, over the last several years, we believe we have meaningfully increased the long-term value of our maintenance and operations business, a trend which we believe will parallel our deployment of gigabit wireline direct and wireless/wireline converged networks as those deployments dramatically increase the amount of outside plant network that must be extended and maintained.
Now going to Slide 7. Backlog at the end of the fourth quarter was $6.141 billion versus $6.116 billion at the end of the October 2022 quarter, an increase of $25 million. Of this backlog, approximately $3.459 billion is expected to be completed in the next 12 months. Backlog activity during the fourth quarter reflects solid performance as we booked new work and renewed existing work. We continue to anticipate substantial future opportunities across a broad array of our customers.
During the quarter, we received from Lumen, fiber construction agreements in Nevada, Utah, Nebraska, Iowa and Florida. Our Brightspeed, construction and maintenance agreements in Kansas, Ohio, Pennsylvania, New Jersey, Virginia, Tennessee and North Carolina. From Charter, rural fiber construction agreements in Missouri and Tennessee. Various utility line located agreements in Ohio, New Jersey, Maryland and Georgia and various rural fiber construction agreements in Washington, Nevada, Oklahoma, Missouri, Arkansas, Tennessee, Mississippi, South Carolina and Georgia. Headcount was 15,410.
Now I will turn the call over to Drew for his financial review and outlook.