GameStop shares closed up 400 per cent for the week after the video game chain’s stock became a battleground between retail traders and Wall Street professionals, a tussle that captivated investors the world over. — AFP pic

NEW YORK, Jan 30 — Some investors are growing concerned that wild swings in GameStop and other stocks driven by small-time traders could be fresh signs of overexuberance that foreshadow volatility for the broader stock market.