iShares MBS ETF vs iShares 20 Plus Year Treasury Bond ETF — how do they compare? iShares MBS ETF trades at $89.79 (market cap $35.41B), while iShares 20 Plus Year Treasury Bond ETF trades at $77.98 (market cap $47.61B). The key difference: iShares 20 Plus Year Treasury Bond ETF is the larger of the two by market cap, and iShares 20 Plus Year Treasury Bond ETF is more actively traded (49,263,490 versus 5,388,525). Which is the better fit depends on your goals — on Pluang, investors hold iShares MBS ETF for 96 Days and iShares 20 Plus Year Treasury Bond ETF for 83 Days on average.
| MBB | TLT | |
|---|---|---|
Market Cap | $35.41B | $47.61B |
Volume | 5,388,525 | 49,263,490 |
Sector | Fixed Income | Fixed Income |
52-Week High | $96.91 | $92.06 |
52-Week Low | $89.09 | $77.11 |
Typical Hold Time | 96 Days | 83 Days |
Signals from Pluang's Aura AI — not financial advice
MBB, the iShares MBS ETF, trades at $89.73, up 0.57% on the day, but technical indicators signal a bearish trend with moving averages and ADX pointing lower. The ETF recently hit a 52-week low amid rising short interest, which surged 98.3% in September 2026 (Defense World, 2026-09-29). Despite this, institutional investors like Corient Private Wealth and Baird Financial have increased their stakes, and Norway's sovereign wealth fund is rotating into mortgage-backed securities (ETF Trends, 2026-09-04).
The outlook for MBB is cautious due to interest rate sensitivity and convexity risks from its 5.68-year duration, with Seeking Alpha highlighting downside potential if the Fed hikes rates (2026-09-19). However, its high-quality MBS portfolio offers income appeal, with recent dividends paid. Risks include persistent inflation and prepayment volatility, but institutional accumulation suggests long-term confidence.
TLT, the iShares 20+ Year Treasury Bond ETF, trades at $77.87, down 46% over five years amid a historic bond market selloff. The technical outlook is bearish with moving averages signaling continued pressure, while oscillators remain neutral. Recent news highlights Treasury yields reaching multi-decade highs above 5.3%, creating headwinds for long-duration bond funds as investors face elevated interest rate expectations.
The ETF faces significant interest rate risk with the Federal Reserve maintaining higher rates. Current yields above 5% offer attractive income but price depreciation remains a concern. Key risks include prolonged high inflation, further Fed tightening, and economic growth surprises that could extend the bond market downturn.
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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 →The fund will invest at least 80% of its assets in the component securities of the underlying index, and it will invest at least 90% of its assets in US Treasury securities that the advisor believes will help the fund track the underlying index. The underlying index measures the performance of public obligations of the US Treasury that have a remaining maturity greater than or equal to twenty years.
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