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ETF comparison

MBB vs PULS

Both US Aggregate Bond.

iShares MBS ETF · PGIM Ultra Short Bond ETF

Holdings overlap

Weighted by ISIN/CUSIP
0.0 %

0 positions appear in both funds. Buying equal dollars of MBB and PULS would leave roughly 0.0% of each dollar exposed to the same underlying securities.

MBB unmatched 98.2% Shared 0.0% PULS unmatched 99.2%

Unmatched is the part of a fund's weight the other fund doesn't match: names only it holds, plus any extra weight it puts in names both funds hold.

In MBB only
11,209 positions
Shared
0 positions
In PULS only
735 positions

Side by side

MBB

iShares MBS ETF

iShares · US Aggregate Bond

89 composite / 100
Expense ratio
0.040%
Net assets
$35.89B
TTM yield
4.09%
Top-10 conc.
6.6%
PULS

PGIM Ultra Short Bond ETF

PGIM · US Aggregate Bond

84 composite / 100
Expense ratio
0.15%
Net assets
$19.61B
TTM yield
4.35%
Top-10 conc.
7.2%

Sub-score comparison

96
Cost
85
52
Tax efficiency
52
100
Liquidity
100
100
Concentration
100
—
Tracking quality
—
MBB sub-score PULS

Tracking quality isn't part of the composite — see what we don't score for why.

Cost difference

MBB is 11 bps cheaper than PULS. On a $100,000 position that's about $110/yr more in fees for PULS.

Fee figure is the annual expense charged on $100,000. To see how the gap compounds over a multi-decade holding period, open the cost calculator pre-filled with MBB vs PULS.

Top shared holdings

0 shared in total

No shared holdings between these funds.

Only in MBB

11,209 total
  • Government National Mortgage Association 1.05%
  • Freddie Mac 0.98%
  • UMBS, TBA 0.85%
  • UMBS, TBA 0.70%
  • Government National Mortgage Association 0.53%
  • Government National Mortgage Association 0.51%
  • Government National Mortgage Association 0.51%
  • Government National Mortgage Association 0.50%
  • Government National Mortgage Association 0.49%
  • Fannie Mae 0.49%

Only in PULS

735 total
  • PGIM ETF Trust 1.95%
  • Suncor Energy Inc. 0.77%
  • INTESA SANPAOLO SPA 0.68%
  • Alimentation Couche-Tard Inc. 0.67%
  • Healthpeak Properties Inc 0.58%
  • Alexandria Real Estate Equities, Inc. 0.53%
  • Essential Utilities Inc 0.52%
  • HUDSON YARDS 2025-SPRL MORTGAGE TRUST 0.50%
  • ABN AMRO BANK NV 0.50%
  • SOFI CONSUMER LOAN PROGRAM 2026-C TRUST 0.49%

Related comparisons

More comparisons with MBB

More comparisons with PULS

Percentages are holdings overlap with the named fund.

Open MBB or PULS at a brokerage

Both funds trade commission-free at major US brokerages.

Open at Fidelity

Affiliate links — opening an account through these earns PlainIndex a one-time referral. Scoring is computed before any affiliate consideration; see our methodology and funding disclosure.

Holdings overlap is the sum of min(weight_a, weight_b) over positions matched on ISIN (CUSIP fallback). Methodology: see /methodology/.

Comparing two funds doesn't endorse swapping one for the other. Tax-lot history, account type, and personal goals matter — PlainIndex publishes data and methodology, not investment advice.