LASR vs. IPGP: Which Fiber Laser Stock is the Better Buy Now?

nLIGHT (LASR) reported strong Q2 2025 results, with revenues up 22% and defense sales surging 74.5% year-over-year, driven by major DoD contracts like HELSI-2, contributing to a 173.3% YTD stock gain. In contrast, IPG Photonics (IPGP) saw Q2 revenues decline 3% and earnings drop 42%, primarily due to weak industrial demand and increased competition in China, leading to a modest 9.9% YTD gain. This performance disparity positions LASR as a more favorable investment due to its accelerating momentum in the defense sector and lower exposure to challenging Chinese markets, despite its higher valuation.

Analysis

The fiber laser sector is exhibiting a sharp divergence in performance between nLIGHT (LASR) and IPG Photonics (IPGP), driven by their distinct end-market exposures. nLIGHT demonstrated significant momentum in its second quarter, with revenues growing 22% year-over-year to $61.7 million, reversing a prior-year loss to post a non-GAAP EPS of 6 cents. This growth is almost entirely attributable to its Aerospace and Defense (A&D) segment, where revenues climbed 49% and now represent 66% of total sales. Specifically, defense product sales surged 74.5%, fueled by long-term U.S. Department of Defense programs like HELSI-2, prompting management to raise its full-year A&D growth forecast from 25% to at least 40%. In stark contrast, IPG Photonics is facing considerable headwinds, with its Q2 revenues declining 3% to $250.7 million and non-GAAP earnings plummeting 42%. The company's struggles are rooted in weak industrial demand and heightened competition in China, which are pressuring both sales volumes and pricing. The market has priced this bifurcation accordingly: LASR's shares have gained 173.3% year-to-date, trading at a premium 5.91x forward sales multiple, whereas IPGP has seen a modest 9.9% gain and trades at 3.38x. The analysis suggests LASR's valuation premium is justified by its superior growth trajectory and insulation from the challenges impacting IPGP's core industrial markets.

Key Decisions for Investors

• Given nLIGHT's accelerating, defense-driven revenue growth and positive earnings revision, investors may find its premium valuation justified and should consider it for growth-focused portfolios.
• For IPG Photonics, a cautious or hold stance is warranted due to its significant earnings decline and exposure to a weakening Chinese industrial market; a turnaround would require stabilization in this market or material revenue from new ventures.
• Consider a pairs trade strategy, long LASR and short IPGP, to capitalize on the diverging fundamentals tied to defense sector strength versus industrial market weakness.
• Investors in nLIGHT should closely monitor its high concentration in the defense sector, as any shifts in government spending or contract timelines represent a key risk to its growth narrative.