AI's undersea fiber nearly triples by 2029; Furukawa's profit lift came from selling shares
Lightera, the Furukawa group's submarine fiber arm, is betting on AI's ocean cables with nearly triple capacity by 2029. The same week, its parent raised profit guidance without touching sales or operating profit, on gains from selling shares.
Vincent Jiang · 2 min read
The glass under AI's transoceanic backbone is made in two towns: Brøndby, outside Copenhagen, and Norcross, Georgia. On 21 September 2026 their owner, Lightera, the submarine fiber arm of Japan's Furukawa Electric Group, said it will pour new capital into both plants and nearly triple submarine optical fiber capacity by 2029 1.
Fiber is bought a year ahead, so tripling is a demand signal
Submarine fiber is typically purchased about a year before a cable is laid, and Lightera says its direct lines to cable manufacturers and hyperscalers give it early visibility of bookings 1. The pipeline behind that confidence landed the same week: Meta's Petal, announced 21 September, is the first petabit-capacity transoceanic cable, about 7,000 km from the US to France, due in service in 2029, with NEC handling design and construction and Sumitomo Electric supplying fiber 23. Lightera aims its own multicore fiber at initial submarine deployments in 2029–2030 1. Note who Meta picked: Sumitomo, not Lightera.
Watch the operating line, not the headline
On 24 September, Furukawa Electric raised first-half profit guidance to ¥58.0bn from ¥42.5bn. Net sales, at ¥720bn, and operating profit, at ¥49.5bn, did not move 4. The lift followed sales of investment securities 5. All ¥15.5bn of the upgrade sits below the operating line.
A legacy stake funds the upgrade
The same day, UACJ, the aluminum maker whose register Furukawa has been trimming since 2024, published its view of the sale of its shares by Furukawa Electric: better liquidity, no operational impact 67. Furukawa had sold 13 million UACJ shares in a December 2025 block 8, after a June 2024 sale that carried ¥1.2bn in extraordinary losses 9. The filings reached do not name this week's securities; the same-day timing points to the legacy stake. The seller's own stock traded at ¥3,826, up 282% this year, with the average analyst target at ¥6,140 and Jefferies at ¥10,500 4.
After a 282% run, the average target still sits 60% above the price
- Estimate
Data
| Value | |
|---|---|
| Close, 25 Sep 2026 | ¥3,826 |
| Consensus target (10 analysts) (estimate) | ¥6,140 |
| Jefferies target (4 Sep) (estimate) | ¥10,500 |
The build is real, and so is the bill
The counterweight is genuine: Furukawa has committed ¥100bn, about $635m, to fiber and cable capacity across Japan, the US, Brazil and India, with volume from the second half of FY2028 103. Its Snap-Beam connector for co-packaged optics, in a gang format that joins 320 optical channels, won ECOC's infrastructure award on 22 September 11.
The entire H1 profit upgrade sits below the operating line
- Previous guidance
- Revised guidance (24 Sep)
Data
| Previous guidance | Revised guidance (24 Sep) | |
|---|---|---|
| Net sales | ¥720bn | ¥720bn |
| Operating profit | ¥49.5bn | ¥49.5bn |
| Profit to owners | ¥42.5bn | ¥58bn |
Capacity triples, the upgrade does not
Capacity lands in 2029; the cables land in 2029. Until the operating line moves, AI's fiber premium is being banked one cross-held share at a time.
How this brief was made
01Gathered & sourced195 channels · 1,634 articles▾
Agents swept 195 channels and ingested 1,634 articles, then de-duplicated and ranked them for signal.
02Verified & cross-validated11 claims · 12 data feeds▾
Every one of 11 load-bearing claims was checked against primary sources, with 12 live data feeds reconciling the figures and charts.
- 1PR Newswire, Lightera Announces Major Capital Investment to Expand Submarine Optical Fiber Manufacturing, 21 September 2026
- 2Meta Newsroom, Announcing Petal, a First-of-its-Kind Transoceanic Subsea Cable, 21 September 2026
- 3Nikkei Asia, Japan's NEC joins Meta on ultrafast US-France undersea fiber-optic line, 23 September 2026
- 4MarketScreener (S&P Capital IQ), Furukawa Electric Co., Ltd. Revises Consolidated Earnings Guidance for the Six Months Ending September 30, 2026, 24 September 2026
- 5MarketScreener (MT Newswires), Furukawa Electric Lifts H1 Profit Forecast Following Sale of Investment Securities, 24 September 2026
- 6UACJ Corporation News Room, UACJ's View on the Sale of Its Shares by Furukawa Electric Co., Ltd., 24 September 2026
- 7MarketScreener (MT Newswires), UACJ Says Furukawa Electric Share Sale to Boost Liquidity, Has No Impact on Operations, 24 September 2026
- 8Yahoo Finance (Simply Wall St), Assessing UACJ (TSE:5741) Valuation After Furukawa Electric's Major Stake Sale and Shareholder Shift, 8 December 2025
- 9Zonebourse (MT Newswires), Furukawa Electric vend des actions UACJ, prévoit des pertes extraordinaires de 1,2 milliard de yens pour l'exercice 2025 consolidé, 11 June 2024
- 10ETTelecom, Furukawa to invest ₹6,000 cr to expand optical fiber and cable production capacity in India, US, Brazil, Japan, 4 August 2026
- 11PR Newswire, Furukawa Electric and Lightera's Snap-Beam Connector for Co-Packaged Optics Wins ECOC Fibre Infrastructure Innovation Award 2026, 22 September 2026
03Reviewed & edited1 human editor▾
One editor read the draft against the evidence, tuned the framing, and signed off before it shipped.
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