BIG Fiber Secures $250 Million Financing to Expand Dark Fiber Network

May 19, 2026
BIG Fiber has closed a $250 million debt facility led by Stonepeak Credit and La Caisse, with an additional $100 million accordion feature, to support expansion of its dark fiber infrastructure across key U.S. markets.

BIG Fiber has closed a $250 million debt facility with an additional $100 million accordion feature, announced in a press release. The financing was led by Stonepeak Credit and La Caisse and will accelerate the company’s digital infrastructure expansion in core U.S. markets.

The new credit facility follows BIG Fiber’s 2024 green loan milestone and increases its financial capacity for network growth. The funds will refinance existing debt, provide new capital, and support expansion projects already underway, including a multi-market buildout in Greater Atlanta that will add over 205 route miles and 165,000 fiber miles.

The expansion will bring BIG Fiber’s combined Atlanta and San Francisco Bay Area network capacity to 850 route miles and more than 3 million fiber miles. Construction and contracted projects are expected to reach phased readiness for service in early 2027.

Founded in 2019 and based in Sunnyvale, California, BIG Fiber operates high capacity underground dark fiber networks serving data centers and enterprises in the San Francisco Bay Area, Greater Portland, and Greater Atlanta regions.

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