BLK vs STX Comparison

BlackRock is the largest asset manager in the world, with $14.041 trillion in assets under management at the end of December 2025. Its product mix is diverse, with 55% of managed assets in equity strategies, 23% in fixed income, 9% in multi-asset classes, 6% in money market funds, and 5% in alternatives. Passive strategies account for more than 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.

Seagate Technology is a leading supplier of hard disk drives for data storage to the enterprise and consumer markets. It forms a practical duopoly in the market with its chief rival, Western Digital; they are both vertically integrated.