Cogent (CCOI) Q4 2025 earnings review
Grooming Pain Continues, but Margins and Wavelengths Shine
Cogent's Q4 results show a company in deep transition. Total service revenue contracted 4.7% YoY to $240.5M, marking another quarter of deliberate top-line shrinkage as management purges low-margin legacy Sprint contracts. However, the strategy is working on the bottom line: EBITDA as adjusted margin hit an impressive 31.9%, up from 26.5% a year ago. The breakout star is Wavelengths, surging 73.7% YoY to $12.1M as AI-driven demand materializes. Yet, extreme leverage (7.34x net) and a worrying flip to negative operating cash flow (-$6.0M) prove the turnaround is far from complete.
🐂 Bull Case
The optical wave network is a runaway success. Revenue leaped 73.7% YoY, and customer connections surged 84.6% as Cogent captures new AI and hyperscaler demand across its 1,068 wave-enabled locations.
By intentionally shedding unprofitable Off-Net Sprint contracts, adjusted EBITDA margins have expanded for four consecutive quarters, proving the core On-Net fiber model remains highly profitable.
🐻 Bear Case
Despite margin expansion, Operating Cash Flow reversed into negative territory (-$6.0M), highlighting weak cash generation mechanics underneath the adjusted EBITDA figures.
With a Net Leverage Ratio of 7.34x and quarterly interest expense of $54.1M completely swallowing raw EBITDA ($51.7M), Cogent's balance sheet leaves zero room for execution missteps.
⚖️ Verdict: ⚪
Neutral. The margin expansion and Wavelength growth are exactly what bulls want to see, but the massive debt load, shrinking total revenue, and negative cash generation prevent a more bullish stance.
Key Themes
Wavelengths as the AI Growth Engine
Accelerating. Wavelengths are Cogent's primary product innovation and future growth engine. Benefiting heavily from the macro tailwinds of AI and hyperscaler data center connectivity, Wavelength revenue reached $12.1M, up 18.8% sequentially and 73.7% YoY. Customer connections jumped to 2,064 (up 84.6% YoY).
Margin Expansion via Contract Grooming
Accelerating. Management continues to aggressively terminate low-margin and non-core Sprint customers. While this suppresses top-line growth (Off-Net revenue plummeted 17.9% YoY to $92.9M), it has dramatically improved profitability. Non-GAAP gross margin reached 46.8% (up from 38.7% a year ago), and adjusted EBITDA margin hit 31.9%.
IPv4 Address Leasing Remains a Cash Cow
Stable. The strategic monetization of Cogent's vast IPv4 address inventory generated $17.3M this quarter. While slightly down sequentially from Q3's $17.5M, full-year 2025 IPv4 revenue surged 43.8% YoY to $64.5M. The number of billed addresses grew 17.2% YoY to 15.27 million, proving strong pricing power and sustained demand.
The Cash Flow Contradiction
Reversing. A major red flag emerged this quarter: despite management touting record adjusted EBITDA margins, Operating Cash Flow flipped from a positive $3.1M in Q3 to a negative $6.0M in Q4. This structural contradiction raises serious questions about working capital management, cash collections, and the true cash-generative power of the 'groomed' customer base.
Staggering Debt Burden vs Operating Profits
Stable but perilous. Cogent's Net Leverage Ratio remained flat but dangerously high at 7.34x. More concerning is that Q4 interest expense spiked to $54.1M (up 19.3% YoY), completely wiping out the quarter's unadjusted EBITDA of $51.7M. The company is relying entirely on the $25M quarterly T-Mobile IP Transit payments to bridge the gap.
Enterprise Segment Freefall
Decelerating. Legacy revenues continue to collapse faster than new products can backfill. The Enterprise segment fell 24.7% YoY to $34.3M, and Enterprise connections fell 28.8% YoY to 10,513. While management claims this is deliberate 'grooming,' the sheer velocity of the decline pushes the timeline for total company revenue growth further out.
Other KPIs
Accelerating. Unlike the Enterprise segment, Cogent's core Internet transit and wholesale business is thriving. Net-Centric revenue grew 3.1% sequentially and 10.4% YoY. This indicates that the fundamental underlying network assets are gaining market share even as legacy Sprint enterprise circuits are dismantled.
Stable. CapEx was relatively flat sequentially (vs $36.3M in Q3) but down sharply from the $50M+ levels seen in early 2025. This reflects the completion of major Sprint network integration and data center conversion efforts, freeing up theoretical capacity for future debt service.
Guidance
Stable. Following the aggressive dividend cut in Q3 2025 to prioritize deleveraging, the Board maintained the $0.02 quarterly dividend for Q1 2026. Management has signaled that significant capital returns will not resume until the net leverage ratio reaches their 4.0x target.
Key Questions
Operating Cash Flow Disconnect
Operating cash flow turned negative this quarter (-$6.0M) despite expanding adjusted EBITDA margins. Can management detail the specific working capital headwinds or collection delays causing this contradiction?
Grooming Timeline
Enterprise revenue collapsed nearly 25% year-over-year. When exactly will the intentional grooming of legacy Sprint off-net contracts conclude, and when will total company revenue growth cross definitively back into positive territory?
Data Center Monetization Updates
Deleveraging is the company's stated priority, and previous quarters highlighted the planned sale of repurposed Sprint data centers to generate cash. Are there any binding contracts signed, and what is the realistic cash-generation timeline for 2026?