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Data storage

The 6 companies in this industry listed on the NYSE and Nasdaq are worth $521 bn combined; the largest are Sandisk (SNDK), Seagate Technology (STX) and Western Digital (WDC). For each one: what it does, revenue, margin, free cash flow over the last five years and a score from 0 to 10.

Data as of October 2026

Open contest
6 companies value 521 bn revenue 50 bn margin 48.0% free cash flow 18 bn avg. score 4.9
SNDK holds 38.5% of the group's value, 1.3x the runner-up · STX leads the industry without being the largest
Rank Ticker Company Share Value Revenue Margin FCF 5 years FCF/px Yield What it does · why it is here
1 SNDK Sandisk
United States · score 7.1
39% 201 bn 20 bn 56.5% 11 bn 5.7% — NAND flash memory and storage cards · Spun off from Western Digital in 2025; flash memory and SSDs
2 STX Seagate Technology
United States · score 6.2
29% 150 bn 12 bn 26.1% 3.1 bn 2.1% 0.4% High-capacity hard drives · Global hard drive duopoly; demand driven by AI data centers
3 WDC Western Digital
United States · score 6.5
24% 127 bn 13 bn 72.9% 3.5 bn 2.8% 0.1% Hard drives and data storage · The other half of the HDD duopoly, after spinning off its flash memory division
4 P Everpure, Inc.
United States · score 5.7
8% 42 bn 4.3 bn 5.9% 0.1 bn 0.3% — Enterprise data storage and management · California — revenue of $4.3bn
5 QMCO QUANTUM CORP /DE/
United States · score 0.0
0% 0.7 bn 0.3 bn -80.8% -0.0 bn -2.9% — Unstructured data management for the AI era · Colorado — revenue of $296m
6 BLZE Backblaze, Inc.
United States · score 3.9
0% 0.6 bn 0.2 bn -13.1% 0.0 bn 4.2% — High-performance cloud storage for AI workloads · California — revenue of $156m

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What this is. A catalogue, not a guide. Every industry with stocks listed on the NYSE or NASDAQ, the companies contending for its leadership, what each one does according to its own annual report, and the balance sheet it filed with the SEC.

The score runs from 0 to 10 and compares each company with every other one in the almanac on cash generation, profitability, debt, dividends and consistency over the last five years. The higher it is, the better the company fares in that comparison. Curious how much each part weighs? Ask at the bottom of the page.

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