# Lumentum vs Sandisk: Tech Stock Comparison

> Which tech stock offers better growth: Lumentum's optical tech or Sandisk's flash memory?
- Title: Lumentum vs Sandisk: Tech Stock Comparison · The Motley Fool
- Summary: Which tech stock offers better growth: Lumentum's optical tech or Sandisk's flash memory? Lumentum's long-term AI growth potential makes it a better buy than…
- Keywords: lumentum, sandisk, flash memory, optical technology, ai infrastructure, tech stock, market cap, p/e ratio, gross margin, stock performance, finance, money
- Source: The Motley Fool — https://fool.com/coverage/better-buy/2026/10/28/lumentum-vs-sandisk-which-tech-stock-is-the-better-buy-in-november
- Author: John Ballard
- Published: 2026-10-28T12:30:01+00:00
- Read time: 1 min
- Topics: lumentum, sandisk, flash memory, optical technology, ai infrastructure, tech stock, market cap, p/e ratio, gross margin, stock performance, finance, money
## Lumentum's Tech Focus
Lumentum designs optical components for high-speed data centers and cloud infrastructure.
## Sandisk's Storage Specialization
Sandisk produces flash-memory solutions for consumer gadgets and massive cloud systems.
## Lumentum's Market Performance
Lumentum's stock rose 5.88% to $866.18 with a market cap of $78 billion.
## Sandisk's Market Performance
Sandisk's stock rose 3.92% to $1,304.84 with a market cap of $189 billion.
## Lumentum's Customer Risk
Lumentum relies on Customer A for 26.6% and Customer B for 15% of net revenue.
## Lumentum's Recent Growth
Lumentum reported $3 billion revenue, an 83% year-over-year increase, but a $6.9 billion net loss.
## Sandisk's Diversified Base
Sandisk has no single client accounting for more than 10% of net revenue in fiscal 2026.
## Sandisk's Profitability
Sandisk reported $11.4 billion net income with $20 billion revenue in fiscal 2026.
## Lumentum's Financial Health
Lumentum has a debt-to-equity ratio of 0.4x and $300 million free cash flow.
## Sandisk's Financial Strength
Sandisk has negligible debt, a current ratio of 2.3x, and $11.5 billion free cash flow.
## Lumentum's AI Advantage
Lumentum benefits from AI's growing need for optical interconnects as models become more complex.
## Key takeaway

Lumentum's long-term AI growth potential makes it a better buy than Sandisk despite Sandisk's current profitability.