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Diagnostic labs

The 6 companies in this industry listed on the NYSE and Nasdaq are worth $60 bn combined; the largest are Labcorp Holdings (LH), Quest Diagnostics (DGX) and RadNet (RDNT). 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

Comfortable leader
6 companies value 60 bn revenue 30 bn margin 6.5% free cash flow 2.7 bn avg. score 3.1
DGX holds 43.6% of the group's value, 1.0x the runner-up · LH 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 LH Labcorp Holdings
United States · score 5.8
44% 26 bn 14 bn 7.0% 1.2 bn 4.5% 0.9% Lab testing and diagnostic services · Largest US clinical laboratory network
2 DGX Quest Diagnostics
United States · score 6.2
44% 26 bn 12 bn 9.2% 1.4 bn 5.2% 1.4% Lab testing and clinical diagnostics · The other half of the US lab testing duopoly
3 RDNT RadNet
United States · score 3.5
9% 5.5 bn 2.3 bn -0.9% 0.3 bn 5.7% — Diagnostic imaging centers in the United States · Largest independent US network of imaging centers
4 OPK OPKO HEALTH, INC.
United States · score 0.1
2% 1.2 bn 0.6 bn -12.4% -0.1 bn -11.2% — Diversified healthcare: diagnostics and pharmaceuticals · Florida — revenue of $588m
5 LMRI Lumexa Imaging Holdings, Inc.
United States · score 2.7
2% 1.0 bn 1.0 bn -2.7% 0.0 bn — 3.1% — Diagnostic imaging in a national network · North Carolina — revenue of $1bn
6 CCM Concord Medical Services Holdings Ltd
China · score 0.0
0% 0.0 bn 0.1 bn -20.2% -0.0 bn -238.2% — Radiotherapy and diagnostic imaging centers in China · China — revenue of $66m

Other industries in the same sector

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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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