#What is driving the surge in the S&P 500 Momentum Index?
The S&P 500 Momentum Index has seen a remarkable increase of about 31.7% over a two-month period this spring, marking the largest gain in its history since its inception in 1994. This surge is primarily driven by advancements in artificial intelligence and the semiconductor companies that support its infrastructure.
#How significant is the focus on AI stocks?
A closer examination of the Momentum Index as of April 30 reveals a significant tilt towards the Information Technology sector, which represents a 14.01% overweight compared to the broader S&P 500. Within this sector, semiconductors and semiconductor equipment take a larger share, showing a 20.61% overweight position. The month of April was particularly noteworthy, as the Momentum Index achieved its highest single-month outperformance since its start, outperforming the S&P 500 by 8.8%.
A selected group of 42 AI-focused stocks has been responsible for over 75% of all gains in the S&P 500 since November 2022. Meanwhile, the S&P 500 has been hitting record closing highs, approaching levels near 7,563 in May.
#What exactly does the Momentum Index do?
The S&P 500 Momentum Index operates as a filtering mechanism, systematically selecting and emphasizing stocks based on their recent price momentum. It generally trends toward stocks that are currently rising, suggesting a belief that their upward trajectory will continue. The index undergoes periodic rebalancing, adjusting to include stocks with the strongest prior performance.
The Invesco S&P 500 Momentum ETF, represented by the ticker SPMO, closely mirrors the index’s performance. This ETF serves as a straightforward investment vehicle for retail investors seeking momentum exposure without the need to select individual AI stocks. Year-to-date results for SPMO reflect the general rally associated with the momentum investing trend witnessed this spring.
#What should investors consider about this momentum?
The 20.61% overweight in semiconductors within the Momentum Index indicates a concentrated investment strategy rather than a diversified approach. Investors should note that as momentum strategies gain traction and attract additional capital, they tend to drive up the prices of already rising stocks, creating a potential feedback loop. The concentration of 42 AI stocks accounting for 75% of gains since late 2022 illustrates that this cycle of momentum is already very much in play.