The State Street SPDR Portfolio S&P 500 ETF (SPYM) crossed $100 billion in assets as of the market’s close on December 11, becoming one of just 20 US-listed ETFs to reach the threshold.
The fund reached the milestone in just 283 trading days after hitting $50 billion. That’s the fastest any ETF has made that climb, according to State Street Investment Management. The average for all 20 ETFs with $100 billion in assets is 923 trading days to double from $50 billion.
SPYM has pulled in over $32 billion in net inflows this year, according to State Street. That represents more than 50% of the fund’s assets at the start of 2025. The fund attracted $3.76 billion over the past month and $19.63 billion over the past six months, according to ETF Database.
“For relatively new ETF investors, SPYM has been a great building block position in a portfolio,” said Todd Rosenbluth, head of research at VettaFi. “Its low fee and diversification across 11 sectors has helped spark interest the last couple of years.”
Low-Cost S&P 500 Leader
The fund’s expense ratio of just two basis points makes it the cheapest S&P 500 ETF on the market, according to State Street. Combined with the firm’s SPY — the most liquid S&P 500 ETF — State Street now offers investors access to both ends of the S&P 500 ETF spectrum.
SPYM has outperformed its peers across multiple time horizons. The fund returned 17.3% year-to-date through December, compared to 14.5% for the ETF Database category average. Over five years, SPYM returned nearly 15% annually versus 6.5% for the category.
The milestone comes as analysts expect the S&P 500 to report 12.1% earnings growth for 2025, above the 10-year average of 8.6%, according to insights from FactSet. That would mark the fifth consecutive year of earnings growth and the second straight year of double-digit gains.
The Magnificent Seven tech stocks are expected to post 22% earnings growth this year. Meanwhile, the other 493 companies in the index are projected to grow earnings by 9%, according to FactSet. The estimated net profit margin for the index stands at 12.9%. That would be the highest since FactSet began tracking the metric in 2008.
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