Shares of Barclays (BCS) and Royal Bank of Scotland (RBS) were both trading lower on Monday, after the European Banking Authority's released its annual stress tests and showed comparatively weak performance for both UK banks. The tests, which measure a variety of factors across the European banking sector -- including, reserves, capital ratios and leverage -- was the latest hurdle for UK banks, following the Brexit referendum. The news of Brexit sent shock waves across the global economy, but U.K. banks were hit hardest as investors exited their positions as volatility mounted. Barclays and RBS shares are each down more than 50 percent over the past year.

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