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: Choose a regulated provider like Fidelity , Charles Schwab , or Robinhood .

: Decide how many full shares you want. Some brokers like Stash or Public allow "fractional shares," letting you buy with as little as $1 or $10.

To buy Costco stock (ticker: ), you can use a brokerage account for immediate trades or participate in the company's direct purchase plan. Costco Wholesale Corp (COST) -1.30% today Closed: 5:00 AM • Disclaimer After hours: 8:40 AM Apr 28, 2026 Open1,008.62 Mkt cap$442.77B USD 52-wk high1,067.08 High1,014.41 P/E ratio51.90 52-wk low844.06 Div yield0.59% Option 1: Use an Online Brokerage (Easiest)