US equities are demonstrating notable resilience against rising inflationary pressures, underpinned by a robust corporate earnings outlook. A gauge from Citigroup reveals that over the past 21 weeks, the number of analysts lifting their profit forecasts for US companies has consistently surpassed those cutting them, marking the longest run of upward revisions since September 2021.

This trend is laying the groundwork for what could be another stellar quarterly earnings season, following one of the strongest performances on record for US stocks. The upward momentum in earnings forecasts is also providing a significant boost to market sentiment, even as WTI crude prices hold steadfast above $90 per barrel and traders widely anticipate a potential rate hike by the Federal Reserve next week.

Although the pace of the US stock advance has moderated over the past month, the S&P 500 still sits just 1% shy of its all-time high. "It's micro fundamentals, not macro, that are driving the equity market," said Marija Veitmane, head of equity research at State Street Global Markets. "I keep seeing strong earnings upgrades piquing investors' interest in stocks. I don't view this as euphoria or turning a blind eye to risks."

Keith Parker, head of global macro equity strategy at UBS, highlighted that market forecasts for S&P 500 earnings for the coming year have already been revised up by nearly 4% over the last two months alone. "This is extremely rare and reflects the broad-based robustness of recent US corporate profits across multiple sectors."

Bond markets have recently re-established themselves as a pivotal force influencing equity directions. Typically, rising yields elevate financing costs and compress the present value of future earnings, weighing on stocks. However, this time, the move higher in yields has been accompanied by a simultaneous strengthening in growth expectations, suggesting that equities can absorb the impact of higher interest rates.

Some market participants are even more optimistic about the upside potential from the artificial intelligence boom. Willem Sels, global chief investment officer at HSBC Private Banking, noted that current US equity valuations have yet to fully price in the potential scale of productivity gains driven by AI.