A Friday rebound is not the same thing as a clean all-clear signal. The S&P 500 and Nasdaq were heading toward a higher open and poised to record winning weeks, but the move comes after a three-day losing streak and amid bond yields described as near 19-year highs. That makes the session a test of risk appetite, not proof that the market’s underlying concerns have disappeared.

Wall Street’s immediate question is whether buyers can hold their ground when the headlines turn less friendly. The S&P 500 finished marginally lower Thursday as investors focused on the US-Iran war, while Google Finance’s market wrap described modest gains Friday. The competing forces are clear: a rebound in equities on one side, and geopolitical uncertainty plus elevated fixed-income yields on the other.

According to CNBC’s market preview, both the S&P 500 and Nasdaq were positioned for higher openings and weekly gains. That setup matters for short-term traders because the market is attempting to reverse pressure that had already lasted three sessions. But an opening bid is only the first piece of evidence. The more important signal is whether the advance persists through the session and remains intact into next week.

Yields remain the market’s pressure point

The earlier decline was driven in part by escalating fixed-income yields. Schwab market commentary described bond yields as near 19-year highs, a backdrop that can pressure stocks by making bonds more competitive and tightening financial conditions. The market does not need a dramatic new shock for that pressure to return; a renewed rise in yields could be enough to challenge the Friday bounce.

That is why the S&P 500 and Nasdaq may respond sharply to changes in the yield narrative. If yields stabilize, the rebound could indicate that investors are willing to look past the week’s earlier selling. If yields resume their climb, Friday’s strength could look more like a pause in the decline than a durable change in direction.

Geopolitical risk keeps the rally conditional

The US-Iran conflict adds another layer of uncertainty. Thursday’s marginal decline in the S&P 500 showed that geopolitical headlines remain directly relevant to equity sentiment. A modest Friday gain does not resolve that risk; it merely shows that buyers were prepared to return despite it.

For the Nasdaq and S&P 500, the next test extends beyond Friday’s close. Traders will be watching whether the rebound carries into the following week and through month-end, or whether the market again loses traction when attention returns to yields and the conflict. The distinction matters. A sustained advance would suggest improving risk tolerance, while fading momentum could indicate that the three-day losing streak exposed concerns that are still active beneath the surface.

The bottom line is straightforward: Friday’s action is constructive, but conditional. The S&P 500 and Nasdaq may finish the week higher, yet the durability of that strength depends on two variables the market has not controlled—bond yields and geopolitical headlines. Until both stop working against equities, the rebound deserves scrutiny rather than celebration.