BLK vs TMO Comparison

BlackRock is the largest asset manager in the world, with $12.528 trillion in assets under management at the end of June 2025. Its product mix is diverse, with 54% of managed assets in equity strategies, 25% in fixed income, 8% in multi-asset classes, 8% in money market funds, and 5% in alternatives. Passive strategies account for two-thirds of long-term AUM, with the company's ETF platform maintaining a leading market share domestically and on a global basis. Product distribution is weighted more toward institutional clients, which, by our calculations, account for around 80% of AUM. BlackRock is geographically diverse, with clients in more than 100 countries and more than one-third of managed assets coming from investors domiciled outside the US and Canada.

Thermo Fisher Scientific sells scientific instruments and laboratory equipment, diagnostics consumables, and life science reagents. The firm operates through four segments as of year-end 2024 (revenue figures include some cross-segment revenue): analytical technologies (17% of sales); specialty diagnostic products (11%); life science solutions (23%); and lab products and services, which includes CRO services (the remainder).