You don't need much money to start investing in high-quality companies today.Stocks are firmly amid a bull market, which began in October 2022 and was confirmed earlier this year as the S&P 500, Dow Jones Industrial Average, and Nasdaq Composite reached all-time highs.While stocks have risen significantly over the past year, investors still have long-term opportunities in high-quality growth stocks today. Three stocks you can scoop up today for under $1,000 are Tradeweb Markets (TW -1.76%), Interactive Brok ...