Robust semiconductor exports, fueled by sustained global AI infrastructure demand, represent the dominant driver of trader positioning around the 2.5–3.4% bands for South Korea’s Q3 2026 GDP growth. September shipments reached a record $120.9 billion, up 83.5% year-on-year, with chip exports surging 263% to $60.3 billion; early-October figures extended the momentum, doubling year-on-year. This export strength has prompted repeated upward revisions to full-year 2026 forecasts, with major investment banks now averaging 3.5% and the OECD at 3.7%. Q2 GDP printed 3.7% year-on-year, supported by facility investment, yet consumption remains subdued amid elevated core inflation near 2.8–3.0% and the Bank of Korea’s rate at 3%. The closely matched leading outcomes reflect uncertainty over whether September momentum will moderate into the lower band or sustain above 3% ahead of the October 27 advance release.