President Trump's New Tariff Threat Hurts Stock PricesThe president's latest trade bombshell lobbed at Mexico sent investors scurrying for cover.

ByAndrew Osterland

Opinions expressed by Entrepreneur contributors are their own.

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Stock prices were down sharply after the President, a self-described "tariff man," threatened viaTwitterto impose a five percent tariff on all imports from Mexico unless "the illegal immigration problem is remedied." The White House later issued a statement saying that unless Mexico "substantially stops" the number of illegal entrants across the southern border, the tariff would increase to 25 percent by October.

The Dow index was down 1.41 percent while the S&P 500 and Nasdaq composite indexes fell 1.32 percent and 1.51 percent respectively. TheEntrepreneur Index™closed the day 1.55 percent lower.

The President's threat exacerbated fears about slowing global economies and sent interest rates and the price of oil plummeting. The yield on the 10-year Treasury bond fell more than points to 2.13 percent and oil dropped 5.7 percent to $53.37 per barrel.

Gap Inc.had the biggest loss on the Entrepreneur Index™, falling 9.32 percent after reporting financial results late yesterday. The retailer missed earnings and revenue estimates and saw same-store sales under its Gapbrand本季度下降高达百分之十。这是Old Navy brand, which Gap plans to spin-off next year, also struggled with same-store sales down one percent. CEO Art Peck called the quarter "extremely challenging" and blamed everything from bad weather, to lower tax refunds to a late Easter, as well as the company's own poor performance. The stock set a new 52-week low today and is down 27.5 percent this year.

Losses were bad across most sectors of the market. Outside of the REITs,Dollar Tree Inc., up 3.34 percent, was the only stock on the Entrepreneur Index™ with a gain of more than one percent. The discount retailer jumped smartly again today after reporting better than expected financial results yesterday.

The automotive sector took a hit from the Mexican tariff threat. The big automakers all have production facilities in Mexico and source parts and components there.Ford Motor Co.was down 2.26 percent and truck-makerPACCAR Inc.fell 3.26 percent.

Alexion Pharmaceuticalsdropped 5.65 percent. Shares in the drug-maker fell 16.3 percent in May, though they are still up 16.8 percent on the year. Asset managersFranklin Resources(-3.37 percent) andBlackRock(-2.59 percent) both fell sharply with the market volatility.

All thirteentechnologystocks on the Entrepreneur Index™ were down today.Facebook, off 3.05 percent, had the biggest decline in the sector.

Oil and gas producerHess Corp.was down 3.34 percent after the price of oil fell nearly six percent today. The stock is still up 37.9 percent this year but has fallen 16 percent in the last ten days.

The REITs were the only somewhat bright spot in the market.Essex Property Trust(2.2 percent) andExtra Space Storage(1.42 percent) had the biggest gains of the nine REITs on the Entrepreneur Index™.

TheEntrepreneur Index™collects the top 60 publicly traded companies founded and run by entrepreneurs. The entrepreneurial spirit is a valuable asset for any business, and this index recognizes its importance, no matter how much a company has grown. These inspirational businesses can be tracked in real time onEntrepreneur.com.

Wavy Line

Andrew Osterland is a contributing writer forCNBC.com. He specializes in capital markets, personal finance and taxes.

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