Compare iShares MBS ETF (MBB) vs S&P500 ETF (SPY) Price & Performance
Price performance (Past 24H)
Key statistics
Key statistics
iShares MBS ETF vs S&P500 ETF — how do they compare? iShares MBS ETF trades at $89.7 (market cap $35.41B), while S&P500 ETF trades at $776.71 (market cap $821.54B). The key difference: S&P500 ETF is far larger — about 23.2× iShares MBS ETF's market cap, and S&P500 ETF is trading nearer its 52-week high, iShares MBS ETF nearer its low. Which is the better fit depends on your goals — on Pluang, investors hold iShares MBS ETF for 96 Days and S&P500 ETF for 205 Days on average.
| MBB | SPY | |
|---|---|---|
Market Cap | $35.41B | $821.54B |
Volume | 5,388,525 | 40,070,358 |
Sector | Fixed Income | — |
52-Week High | $96.91 | $779.14 |
52-Week Low | $89.09 | $631.99 |
Typical Hold Time | 96 Days | 205 Days |
Aura AI Summary
Signals from Pluang's Aura AI — not financial advice
Aura AI Summary
Signals from Pluang's Aura AI — not financial advice
MBB (iShares MBS ETF) trades at $89.22, down 0.16% amid bearish technical signals with 18 sell indicators versus 2 buy signals. The ETF faces pressure from rising intermediate-term rates and inflation concerns, with short interest surging 98.3% in September 2026 to 6.57 million shares. Recent institutional activity shows mixed sentiment with some firms increasing positions while technical indicators point to continued downward momentum.
The outlook remains challenging with convexity risk and borrower prepayment optionality limiting upside potential. Investment opportunity exists for income-focused investors through consistent dividend payments, but risks include duration exposure during potential rate hikes and persistent inflation pressures affecting mortgage-backed securities performance.
SPY, the SPDR S&P 500 ETF, trades at $777.26, down 0.24% on the day, with a bullish technical signal from moving averages but a neutral reading from oscillators. The ETF is near its pivot point of $776, with immediate resistance at $779. Recent news highlights mixed sentiment, with some articles pointing to strong corporate earnings growth in 2026 but expected deceleration in 2027, while others discuss defensive positioning and valuation concerns.
The outlook for SPY is cautiously optimistic, supported by bullish technical trends and robust earnings growth projections for 2026. Key risks include potential profit growth slowdown in 2027, elevated market valuations, and macroeconomic headwinds such as rising Treasury yields. Investors should weigh the ETF's broad market exposure against these factors for long-term positioning.
Returns comparison
Trailing returns across standard periods
Returns comparison
Trailing returns across standard periods
Investor sentiment on Pluang
What Pluang investors did over the last 30 days
Investor sentiment on Pluang
What Pluang investors did over the last 30 days
About iShares MBS ETF
The fund will invest at least 80% of its assets in the component securities of the underlying index and TBAs that have economic characteristics that are substantially identical to the economic characteristics of the component securities of the index, and the fund will invest at least 90% of its assets in fixed income securities included in the underlying index that advisor believes will help the fund track the index.
Read more on MBB →About S&P500 ETF
The ETF is designed to track the performance of the securities and the stocks in the S&P 500 Index. To maintain the composition and weightings, the advisor adjusts the ETF from time to time to conform to periodic changes in the index target.
Read more on SPY →
