Amazon.com Inc. spends a lot on paid search ads. The e-commerce giant devoted an average of $37.6 million per month to paid search ads in 2017, according to estimates from search marketing firm Kantar Media (formerly AdGooroo).

That’s over $14 million more than the average monthly paid search spend by Walmart Inc., the second-biggest spender among the Internet Retailer Top 1000, and more than $2 million more than the combined spending of Home Depot Inc., Macy’s Inc., Wayfair Inc. and Overstock.com Inc., which were the third, fourth, fifth and sixth most prolific spenders last year.

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