Cogent Communications Carries the Internet but Its Stock Has Been Crushed

• Cogent Communications (CCOI) trades near multi-year lows with wavelength revenue up 73.7% year-over-year to $12.1M in Q4 2025, while legacy Sprint wireline business collapsed 64% from $118M to $43M quarterly. The company carries $2.4B gross debt with negative $10.6M operating cash flow in 2025.

• Cogent is transitioning from a declining legacy Sprint wireline business to high-capacity wavelength services for AI infrastructure and hyperscalers, targeting 25% of the North American market before T-Mobile transition payments end in 2027.

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Most investors have never heard of Cogent Communications (NASDAQ:CCOI). That relative obscurity stands in contrast to the scale of its infrastructure. This is a company that literally carries the internet, trading near multi-year lows while quietly building what could be its most important business yet.

Cogent is a Tier 1 internet backbone provider — the highway system underneath the internet. When data travels across the country or around the world, it often rides Cogent’s all-optical IP network, which spans 57 countries and connects to 1,902 data centers globally. The company directly connects 7,659 networks, more than any other service provider on the internet. That’s a real moat you can’t build overnight.

The 2023 acquisition of Sprint’s wireline business from T-Mobile dramatically expanded Cogent’s physical footprint, giving it 482 owned technical buildings and 3,579 on-net buildings. It also handed Cogent a headache: a legacy Sprint customer base bleeding revenue ever since.

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Cogent is running two businesses simultaneously, moving in opposite directions.

The legacy Sprint wireline business has collapsed from $118 million per quarter at deal close to $43 million per quarter in Q4 2025. That’s a brutal 64% decline. Meanwhile, the original Cogent business has grown from $155 million to $197 million per quarter over the same period.

The headline revenue numbers look ugly. Full year 2025 service revenue came in at $975.8 million, down 5.82% year-over-year. But that number is dragged down by a business Cogent is actively shedding.

The growth story lives in wavelength services — high-capacity optical connections that AI infrastructure, hyperscalers, and large enterprises need badly. Cogent’s wavelength revenue surged 73.7% year-over-year to $12.1 million in Q4 2025, with customer connections up 84.6% to 2,064. CEO Dave Schaeffer laid out the competitive case on the Q4 earnings call:

“Our wavelength services are differentiated due to the uniqueness of the routes, the breadth of our footprint, our efficient provisioning, and aggressive pricing. The reliability that we deliver is unparalleled.”

Cogent currently holds less than 2% of the North American wavelength market while targeting 25%. At 20% to 30% discounts to market pricing, they’re buying share aggressively.

This is not a clean story. Full year 2025 operating cash flow was negative $10.6 million. The company carries $2.4 billion in gross debt and a net leverage ratio of over 8x. The T-Mobile IP transit payments cushioning the balance sheet are scheduled to wind down through 2027. And the stock has fallen roughly 66% over the past year.

The central question for Cogent’s business is whether its wavelength segment can scale fast enough to replace legacy Sprint revenue before the T-Mobile IP transit payments wind down through 2027 and the company’s $2.4 billion debt load becomes a more pressing concern. The fiber backbone infrastructure is a tangible asset. Execution of the transition remains the key variable to monitor in upcoming quarters.

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