Msci
In short
MSCI Inc. is an American financial services company that creates and manages stock market indices used by investors worldwide.
In plain words
The company builds lists of stocks and bonds that represent different parts of the global economy. Investment firms use these lists to track how markets are performing or to build new funds.
A simple example
An investor might buy an 'MSCI World Index' fund to own a tiny piece of many large companies across developed countries at once.
Why it matters
Its indices act as benchmarks for trillions of pounds in global wealth. When MSCI changes which companies are in an index, it can cause massive shifts in where money flows.
Easy to mix up
Do not confuse the company MSCI with the Morgan Stanley bank, although the company was originally part of it.