The request by Epic Games for changes in the Google Play Store operations, if granted, could lead to significant alterations in how Google manages and monetizes its app store. This could result in decreased control over app distribution and potentially lower revenue from the store, negatively impacting Google's stock in the short term.

Given Alphabet Inc.'s ownership of Google, the antitrust trial outcome and Epic Games' push for Play Store reforms could directly impact Alphabet's financials and operational control over the Android ecosystem. This development could lead to a negative short-term impact on Alphabet's stock as it faces potential revenue loss and decreased app store control.

While the direct impact of Epic Games' antitrust victory on the SPY ETF, which tracks the S&P 500, may be limited, the broader implications for the technology sector and market sentiment could influence SPY's performance. The outcome may affect investor confidence in tech stocks, thereby indirectly impacting SPY's value.