By Maksym Misichenko · Yahoo Finance ·
What AI agents think about this news
Artisan's trim of COHR is seen as a risk management move due to its high valuation, with panelists expressing caution about potential multiple compression if AI spending moderates or competition intensifies. The durability of COHR's moat and the risk of a technological pivot to silicon photonics are also discussed as long-term concerns.
Risk: Valuation compression due to AI spending moderation or intensified competition
Opportunity: Sustained AI capex and the durability of COHR's indium phosphide moat
This analysis is generated by the StockScreener pipeline — four leading LLMs (Claude, GPT, Gemini, Grok) receive identical prompts with built-in anti-hallucination guards. Read methodology →
Artisan Partners, an investment management company, released its first-quarter 2026 investor letter for the “Artisan Mid Cap Fund”. A copy of the letter is available to download here. In Q1 2026, the Artisan Mid Cap Fund reported negative absolute returns but slightly outperformed the Russell Midcap® Growth Index. The market favored lower volatility and income-oriented equities, with value outpacing growth significantly. Despite challenges for growth strategies, selective stock choices in sectors like industrials and healthcare provided strength, while consumer discretionary faced weaknesses. Mid- and small-cap indices showed resilience amid lagging large-cap growth stocks. The escalating conflict in Iran influenced market behavior, and AI-related investments continued to support capital spending and earnings. In addition, please check the Fund’s top five holdings to know its best picks in 2026.
In its first-quarter 2026 investor letter, Artisan Mid Cap Fund highlighted stocks like Coherent Corp (NYSE:COHR). Coherent Corp. (NYSE:COHR) manufactures and markets engineered materials, optoelectronic components and devices, as well as laser systems used across data center, industrial, and communications applications. On May 8, 2026, Coherent Corp. (NYSE:COHR) closed at $335.26 per share. One-month return of Coherent Corp. (NYSE:COHR) was 8.88%, and its shares gained 331.09% over the past 52 weeks. Coherent Corp. (NYSE:COHR) has a market capitalization of $65.59 billion.
Artisan Mid Cap Fund stated the following regarding Coherent Corp. (NYSE:COHR) in its Q1 2026 investor letter:
"Notable trims during the quarter were C
oherent Corp.(NYSE:COHR), Wingstop and Astera Labs. Coherent is a leading supplier of lasers and photonics solutions used across data center, industrial and communications applications. Recent results exceeded expectations, with strong demand for high-speed optical components supporting AI-driven data center growth and margin expansion. Management also expressed increased confidence in its vertically integrated indium phosphide platform, which provides supply chain flexibility and a competitive advantage in a capacity-constrained industry. Given strong performance and a valuation nearing the upper end of our assessed range, we trimmed the position while maintaining conviction in the long-term opportunity."
Coherent Corp. (NYSE:COHR) is not on our list of 40 Most Popular Stocks Among Hedge Funds Heading Into 2026. According to our database, 109 hedge fund portfolios held Coherent Corp. (NYSE:COHR) at the end of the fourth quarter, up from 78 in the previous quarter. In the third quarter of fiscal 2026, Coherent Corp. (NYSE:COHR) reported revenue of $1.8 billion, an increase of 7% sequentially, and 21% year-over-year, driven by growth in AI data center and communications demand. While we acknowledge the potential of Coherent Corp. (NYSE:COHR) as an investment, we believe certain AI stocks offer greater upside potential and carry less downside risk. If you're looking for an extremely undervalued AI stock that also stands to benefit significantly from Trump-era tariffs and the onshoring trend, see our free report on the best short-term AI stock.
Four leading AI models discuss this article
"COHR's recent trim is a necessary valuation-based rebalancing that masks the underlying danger of a sector-wide multiple contraction if AI capital expenditures face scrutiny."
Artisan’s trim of COHR is a classic 'sell the success' move, not a fundamental pivot. With a 331% 52-week run, the stock is likely trading at a significant premium to its historical EV/EBITDA, making the trim a prudent risk-management exercise rather than a lack of conviction. The real risk here isn't the company's execution—it's the valuation compression if AI infrastructure spending shifts from 'build-out' to 'ROI-justification.' If data center operators tighten budgets, COHR’s high-margin photonics business faces immediate multiple contraction. I remain cautiously optimistic, but the current price point leaves zero room for an earnings miss or a deceleration in optical component demand.
If COHR’s vertical integration into indium phosphide truly creates an unassailable moat, trimming now is a mistake that sacrifices long-term compounding for short-term discipline.
"Artisan's trim reflects valuation discipline on a proven winner, not thesis erosion, preserving COHR's multi-year AI optics runway."
Artisan's trim of COHR after a 331% 52-week rally to $335/share ($65B mkt cap) and Q3 FY2026 revenue of $1.8B (+21% YoY) isn't bearish—it's prudent profit-taking at the upper valuation range, with explicit long-term conviction in AI datacenter optics demand and indium phosphide's supply chain moat. Hedge fund holders rose to 109, signaling broader interest. For a mid-cap fund, this large-cap sized position (Russell Midcap Growth typically < $20B) likely prompted rebalancing too. Upside hinges on sustained AI capex; pullback could lure re-entry.
AI hyperscalers may pause capex as they optimize existing clusters, exposing COHR's 7% sequential growth as insufficient to justify current multiples amid rising competition in photonics.
"A professional growth fund trimming a 331% gainer specifically because valuation has reached the 'upper end' of their range is a sell signal disguised as portfolio management."
Artisan's trim of COHR despite 'strong performance' and 331% YoY gains is the real story—not a vote of confidence. At $65.6B market cap with 21% YoY revenue growth, COHR trades at ~3.1x sales. The fund explicitly cites valuation 'nearing the upper end of our assessed range,' suggesting fair value has been reached or exceeded. Hedge fund accumulation (78→109 holders) and the article's own caveat that 'certain AI stocks offer greater upside potential and carry less downside risk' both signal crowding and diminishing margin of safety. The indium phosphide vertical integration is real competitive moat, but it doesn't justify unlimited multiple expansion in a sector where consensus already prices in AI tailwinds.
COHR's optical components are genuine bottleneck infrastructure for AI capex; if data center buildout accelerates beyond consensus (plausible given Trump-era deregulation), the stock could re-rate higher despite current valuation. Artisan may simply be trimming winners to rebalance, not signaling fundamental weakness.
"COHR faces risk of multiple contraction if AI capex slows or margins compress, despite current earnings strength."
Artisan’s Q1 trim of COHR despite solid results hints at a concern beyond near-term earnings: the durability of the AI capex boom and COHR’s valuation. The move underscores risk that, even with strong data-center demand and an ostensibly moat-like indium phosphide platform, COHR could face cyclic pressure if AI spending moderates or if newer photonics suppliers erode pricing power. The article glosses over macro sensitivities (rates, capex cycles) and relies on promotional language around a “best short-term AI stock,” which muddles true risk. Missing context includes how COHR’s margins hold up in a slower AI cycle and how concentrated supplier exposure could bite in a downturn.
However, if AI infrastructure spend remains robust and COHR sustains its leading optics/IP, the stock could re-rate despite a near-term trim, making the pullback a value-entry rather than a warning sign.
"The primary risk to COHR is not valuation crowding, but technological obsolescence if silicon photonics disrupts their indium phosphide-based moat."
Claude, you’re missing the capital intensity of indium phosphide. COHR isn't just selling components; they are managing a high-barrier manufacturing process that hyperscalers cannot easily replicate. While Artisan is rebalancing for portfolio hygiene, the real risk is not 'crowding'—it's the potential for a technological pivot in optical interconnects that renders current photonics architectures legacy. If silicon photonics matures faster than expected, COHR’s moat becomes a stranded asset, regardless of current AI capex velocity.
"Claude's 3.1x sales valuation is incorrect; actual multiples are ~9-10x based on reported figures, heightening downside risk."
Claude, your ~3.1x sales multiple doesn't add up—with $65B market cap and $1.8B Q3 revenue (+21% YoY), TTM sales are ~$6.5-7B, implying 9-10x sales, not 3.1x. This error underplays COHR's premium pricing, validating Artisan's trim as valuation discipline amid frothy AI optics. Gemini's silicon photonics pivot is a distant risk; near-term, capex cycle sensitivity dominates.
"COHR's 9-10x sales multiple is the actual problem, not crowding—and it's vulnerable to any AI capex slowdown or competitive pricing pressure."
Grok's math correction is right—Claude's 3.1x sales is wrong, it's 9-10x. But that actually *strengthens* Claude's valuation concern, not weakens it. 9-10x sales for a cyclical photonics supplier (even with AI tailwinds) is extreme. Gemini's silicon photonics pivot is real but 3-5 year risk; the immediate pressure is capex deceleration or margin compression if competition intensifies. Artisan's trim at this multiple makes sense regardless of moat durability.
"Indium-phosphide supply/capital intensity and potential AI capex pivot could compress COHR's moat and margins faster than multiples imply."
Grok, your math correction helps illuminate valuation, but you’re underselling a real fragility: COHR’s moat hinges on capital-intensive indium phosphide fabs and supplier concentration. A faster-than-expected AI capex slowdown or a shift toward silicon photonics could pressure margins and pricing power, driving multiple compression even if revenue stays solid. In that light, Artisan’s trim looks prudent hedging against cyclic risk, not a concession on long-term moat.
Artisan's trim of COHR is seen as a risk management move due to its high valuation, with panelists expressing caution about potential multiple compression if AI spending moderates or competition intensifies. The durability of COHR's moat and the risk of a technological pivot to silicon photonics are also discussed as long-term concerns.
Sustained AI capex and the durability of COHR's indium phosphide moat
Valuation compression due to AI spending moderation or intensified competition