IEF vs MBB: Holdings Overlap
IEFiShares 7-10 Year Treasury Bond ETF
iShares · 15 holdings · $47.3B · as of 2026-05-31
iShares · 11144 holdings · $39.1B · as of 2026-05-31
How similar are IEF and MBB?
iShares 7-10 Year Treasury Bond ETF (IEF, by iShares) holds 15 positions; iShares MBS ETF (MBB, by iShares) holds 11144. They have 0 holdings in common, and by portfolio weight the two funds are 0.0% identical. In practical terms the pair is essentially distinct, holding almost none of the same securities.
- Overlap by Weight
- 0.0%Sum of the smaller weight of each shared holding
- Shared Holdings
- 0IEF holds 15 · MBB holds 11144
- Weight in Shared Holdings
- IEF 0%·MBB 0%Share of each fund's weight in stocks both funds own
Based on each fund's latest official holdings. How is this calculated?
What makes each fund different
Only in IEF
15 of 15 positions (98.2% of the fund) are not held by MBB.
- U.S. Treasury Notes9.54%
- U.S. Treasury Notes8.78%
- U.S. Treasury Notes8.75%
- U.S. Treasury Notes8.73%
- U.S. Treasury Notes8.71%
- U.S. Treasury Notes8.63%
Only in MBB
11144 of 11144 positions (98.1% of the fund) are not held by IEF. Showing the top 30 by weight.
- Freddie Mac Pool1.05%
- Ginnie Mae0.95%
- Uniform Mortgage-Backed Security, TBA0.83%
- Ginnie Mae0.67%
- Uniform Mortgage-Backed Security, TBA0.64%
- Ginnie Mae II Pool0.55%
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| IEF | -0.2% | -0.9% | +1.3% | +3.1% | -1.6% | +0.5% | 3.95% |
| MBB | -0.2% | +0.4% | +3.9% | +4.7% | +0.3% | +1.2% | 4.33% |
Total returns including dividends, from adjusted daily closes as of 2026-08-07. 3Y/5Y/10Y are annualized. Yield is trailing-12-month distributions over the last close. Past performance does not predict future results.
Project the growth of $10,000 in IEF vs MBB →
Shared Holdings(0)
These two funds have no holdings in common.
Frequently Asked Questions
How much do IEF and MBB overlap?
IEF and MBB overlap by 0.0% of portfolio weight. They share 0 holdings (IEF holds 15 positions and MBB holds 11144), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IEF and MBB?
The two portfolios are 0.0% identical by weight. Owning both is genuine diversification: the funds hold almost none of the same securities.
What does IEF own that MBB doesn't?
15 positions (98.2% of IEF) are unique to IEF, led by U.S. Treasury Notes, U.S. Treasury Notes and U.S. Treasury Notes. In the other direction, 11144 positions (98.1% of MBB) are unique to MBB.