what is the dow 30 or us 30 
the us 30 or dow 30 is a widely watched stock market index comprised of 30 large u s publicly traded companies also known as the dow jones industrial average or the dow the us 30 tracks the combined share price performance of what its committee considers to be the most important names on the new york stock exchange nyse and nasdaq excluding transportation and utility companies in many people s eyes the us 30 is a barometer of the u s stock market and economy 1the us 30 is managed by s p dow jones indices its constituents are chosen by a committee and it is price weighted meaning each company s stock is weighted by its price per share the value of the index is computed by adding up all the stock prices of its 30 components and dividing the sum by the dow divisor 1understanding the us 30