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As of the time of writing on June 15, 2026, the U.S. market is open and intraday data for individual stock movers is still updating in real time, so any list of “top” gainers/losers can change by the close.

The dominant macro driver today is the tentative U.S.–Iran agreement to extend a ceasefire and reopen the Strait of Hormuz, which has sent global equities higher and pushed Brent crude down roughly 4–5% to the low‑$80s. This is easing concerns about energy-driven inflation and future rate hikes and is lifting risk assets broadly, especially growth and small‑cap names. (apnews.com)

At the index level, the S&P 500 is up around the high‑single‑digit tenths to ~1–2%, the Nasdaq is outperforming with gains around 2–3%, and the Dow is also firmly positive, reflecting a pro‑risk, growth‑tilted rally at the open. (apnews.com)

Sectors most positively exposed to lower oil (airlines, transports, consumer discretionary) and to lower‑for‑longer rates (technology, small‑cap growth) are leading; energy is lagging given the drop in crude prices.

Traders are also positioning ahead of incoming Fed commentary later this week, with falling oil prices helping to pull down Treasury yields and modestly lowering the market’s implied path of policy rates. (apnews.com)