Why it matters
The world’s largest companies (US$200bn+). Benchmark collections are a clean way to compare market leaders, index heavyweights and size segments without building a screen from scratch.
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Mega Caps
The world’s largest companies (US$200bn+).
Mega-caps are the market’s giants — companies worth $200bn or more that set the tone for entire sectors. This collection ranks the largest listed companies across the UK and US by market capitalisation.
What to check next
Compare sector mix, valuation, quality and risk across the group rather than assuming larger companies are automatically safer.
Main risk
Large benchmark names can become crowded, expensive or overly exposed to one macro factor despite appearing diversified at first glance.
Showing the 40 largest of 106 — sort or filter to explore the rest.
- RewardRiskYield0.0%
- RewardRiskYield0.3%
- RewardRiskYield0.3%
- RewardRiskYield0.7%
- RewardRisk
- RewardRiskYield1.0%
- RewardRisk
- RewardRiskYield0.7%
- RewardRiskYield0.4%
- RewardRisk
- RewardRisk
- RewardRisk
- RewardRisk
- RewardRiskYield0.5%
- RewardRiskYield0.1%
- RewardRiskYield1.7%
- RewardRiskYield0.8%
- RewardRisk
- RewardRiskYield0.7%
- RewardRiskYield2.5%
- RewardRiskYield0.5%
- RewardRiskYield2.0%
- RewardRiskYield6.3%
- RewardRiskYield0.6%
- RewardRisk
- RewardRiskYield2.6%
- RewardRisk
- RewardRiskYield1.5%
- RewardRiskYield1.3%
- RewardRiskYield1.8%
- RewardRiskYield0.6%
- RewardRisk
- RewardRiskYield0.3%
- RewardRiskYield3.4%
- RewardRiskYield2.0%
- RewardRiskYield2.3%
- RewardRiskYield0.4%
- RewardRiskYield2.1%
- RewardRiskYield0.8%
- RewardRiskYield5.2%
Related collections
Frequently asked questions
What is the Mega Caps collection?
The world’s largest companies (US$200bn+). It currently holds 106 stocks, each rated by Openbook's Reward and Risk scores. Mega-caps are the market’s giants — companies worth $200bn or more that set the tone for entire sectors.
How are Mega Caps stocks selected?
Constituents are chosen by a rules-based screen over the full UK and US common-stock universe, then ranked by market capitalisation.
How often is the Mega Caps list updated?
It is rebuilt from live market data, so the constituents and their rankings update as prices and company fundamentals change — there is no fixed, hand-edited list.
How should I use the Reward and Risk ratings?
Openbook's Reward rating combines a stock's growth, momentum, profitability and valuation into a single 0–100 score, and the Risk rating scores financial strength, volatility and size. Use them to compare names within this theme — broadly, a higher Reward alongside a lower Risk is more attractive. They are quantitative research signals, not investment advice.
Openbook Reward and Risk ratings and factor scores are quantitative signals for research, not investment advice. Data may be delayed. Some US-listed names carry partial factor coverage.