Memory & Optical Stocks Up 100%+ in 2026: Why We're Not Selling (Micron, SK Hynix, SanDisk, Lumentum)

Key takeaways

Memory stocks have experienced explosive growth in 2026, with many holdings up over 100%.
Investors should consider risk management strategies to protect their gains due to potential market changes.
Supply chain and geopolitical risks, especially related to Chinese manufacturers like CXMT, could impact memory pricing and margins in the coming years.
Despite outsized gains, maintaining current allocations is a strategic choice, with careful monitoring of market conditions.
Optical network equipment companies like Lumentum and Coherent are promising investments for the second half of 2026, supported by technological trends and strategic investments from major players like NVIDIA.
Stay informed about global supply dynamics, trade restrictions, and new manufacturing capacity to anticipate market shifts.

Summary

First Half 2026 Portfolio Performance and Major Gains

The episode begins with a reflection on the first half of 2026, highlighting extraordinary gains in the portfolio, especially in memory stocks like Kioxia and Sandisk, which have outperformed expectations. The hosts emphasize the importance of risk management given the outsized gains, suggesting viewers consider strategies to protect their profits without necessarily selling immediately. The discussion points out that even small allocations in these stocks have generated significant returns, making it a pivotal moment to reassess investment strategies.

Analysis and Outlook for Memory and Optical Stocks

The hosts analyze the performance of their memory stocks (such as Micron, SK Hynix, Western Digital, Seagate, NVE Corp, GSI Technology) and optical companies (like Lumentum, Coherent). They discuss the dominance of memory companies in 2026, with some stocks up over 100%, and explore the potential for continued growth. They also consider the risks of an easing supply crunch, especially with new Chinese manufacturers like CXMT and the broader impact of increased manufacturing capacity across the world. The conversation emphasizes that while margins remain high, supply expansions could lead to price pressure over the coming years.

Risks on the Horizon: Supply, Geopolitics, and Chinese Manufacturers

This section delves into the geopolitical and supply chain risks that could influence the memory market, including the IPO of Chinese firm CXMT and access to advanced equipment from ASML and others. The hosts highlight the complexities of global supply chains, trade restrictions, and the potential for supply increases to lower pricing and margins. They caution investors to monitor these risks over the next three to five years, especially with Chinese domestic manufacturers and their expanding capacity.

Optical Network Sector Analysis and Top Picks for H2 2026

The episode covers the optical networking sector, with a focus on Lumentum and Coherent, which are the hosts’ top recommendations for the second half of 2026. They review recent performance, noting that some of these stocks have paid dividends and their total return outlook. The discussion ties in NVIDIA’s investment in these companies, underscoring their strategic importance. The hosts express optimism about continued growth in optical networking, driven by technological advancements and demand in data centers.

Show notes

Memory and optical semiconductor stocks have been the standout trade of 2026, with holdings like Micron, SK Hynix, and SanDisk up well over 100% year-to-date on tight supply and rising pricing. In this mid-year portfolio review, we break down six months of real performance across our memory holdings (Micron, SK Hynix, SanDisk, Western Digital, Seagate, NVE Corp, GSI Technology) and optical networking positions (Lumentum, Coherent, Applied Optoelectronics, Broadcom, Viavi Networks), explain why we're maintaining our allocation despite outsized gains, and walk through the risk management conversation every investor should be having right now.

We also dig into the looming supply-side risk from CXMT's IPO in China, how the "Fab Five" equipment makers (ASML, Applied Materials, Lam Research, Tokyo Electron, KLA) and Chinese players like ACM Research fit into the memory cycle, and why Lumentum and Coherent remain our top optical picks for the second half of 2026, backed by NVIDIA's direct investment in both companies. This is a research-backed, data-driven portfolio update built for long-term fundamental semiconductor investors — not stock picking hype.

Join Semi Insider for full access to our research platform and tools at https://chipstockinvestor.com. Get 15% off your membership with our data partner Fiscal.ai: https://fiscal.ai/csi.

Content is for general information and entertainment only and is not investment advice. CSI owns shares of the companies discussed.