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OEF vs SEIM: Differences, Returns & Fees

OEF and SEIM hold 29% of their weight in the same names, and SEIM returned +22.3% over the year. Net assets: $20.8bn on Oct 9, 2026 for iShares S&P 100 ETF, and $1.5bn on Jun 30, 2026 for SEI Enhanced U.S. Large Cap Momentum Factor ETF.

SEIM costs 0.05 points a year less; their one-year returns differ by 5.5 points; OEF is 13.4 times larger.

OEFSEIM
Expense ratio0.20%0.15%
Net assets, as of Jun 30, 2026$20.0bn$1.5bn
Total return, 1 year+16.8%+22.3%
What it tracksS&P 100No index, actively managed
Holdings in common29%
Top ten holdings, share of the fund52.6%37.6%

Holdings in common uses holdings dated Jun 30, 2026 and Oct 8, 2026.

+16.8%
OEF total return, 1 year
+22.3%
SEIM total return, 1 year
0.20%
OEF expense ratio
0.15%
SEIM expense ratio

What they hold in common

By the books each fund has filed, OEF and SEIM hold 29% of their money in the same securities at the same weight. Above 50%, holding both is close to holding one of them twice. Holdings dated Jun 30, 2026 and Oct 8, 2026.

half

29% in common

Positions both hold, largest shared weight first
Holding OEF SEIM
NVIDIA 11.23% 6.24%
ALPHABET CLASS A 4.11% 7.00%
APPLE 10.00% 2.90%
MICROSOFT 7.81% 2.66%
MICRON TECHNOLOGY 2.36% 2.98%
VISA CLASS A 1.29% 2.84%
JOHNSON & JOHNSON 1.24% 2.48%
AMAZON.COM INC 5.02% 1.05%
CISCO SYSTEMS INC 0.91% 1.81%
LAM RESEARCH 0.81% 3.86%
CATERPILLAR INC 0.74% 2.31%
PALANTIR TECHNOLOGIES CLASS A 0.92% 0.72%
Only in OEF
META PLATFORMS CLASS A 3.20%
TESLA INC 2.13%
ADVANCED MICRO DEVICES 2.04%
BERKSHIRE HATHAWAY INC CLASS B 1.92%
ELI LILLY 1.88%
JPMORGAN CHASE & CO 1.77%
EXXONMOBIL HOLDINGS CORP 1.39%
INTEL CORPORATION 1.07%
Only in SEIM
APPLIED MATERIALS, INC. 3.37%
JABIL INC. 2.64%
CIENA CORPORATION 2.31%
TAPESTRY, INC. 2.12%
NORTHERN TRUST CORPORATION 2.06%
EBAY INC. 2.02%
CARDINAL HEALTH, INC. 1.99%
PARKER-HANNIFIN CORPORATION 1.93%

Check overlap with more funds →

On the same fields

OEF
iShares S&P 100 ETF
SEIM
SEI Enhanced U.S. Large Cap Momentum Factor ETF
Where it sits Stock ETF Stock ETF
Issuer iShares SEI
What it is Tracks an index Actively managed
Total return, 1 year +16.8% +22.3%
S&P 500 over the same days +17.3% +17.3%
Gap to the S&P 500 −0.5 pts +5.0 pts
Expense ratio 0.20% 0.15%
Already in the S&P 500 99.9% 89.4%
Holdings 102 71
Net assets, OEF as of Oct 9, 2026 and SEIM as of Jun 30, 2026 $20.8bn $1.5bn

OEF and SEIM on the fields both publish, as of Oct 9, 2026. Source: ETFIQ.

OEF in plain words

OEF tracks an index. Over the year to Oct 9, 2026 it returned +16.8% with distributions reinvested, against +17.3% for the S&P 500. The prospectus expense ratio is 0.20% a year. By its holdings published by its issuer for Oct 8, 2026, 100% of the fund by weight is stocks the S&P 500 also holds, across 102 positions, with the top ten at 52.6%.

SEIM in plain words

SEIM is actively managed and tracks no index. Over the year to Oct 9, 2026 it returned +22.3% with distributions reinvested, against +17.3% for the S&P 500. The prospectus expense ratio is 0.15% a year. By its holdings filed for Jun 30, 2026, 89% of the fund by weight is stocks the S&P 500 also holds, across 71 positions, with the top ten at 37.6%.

Questions people ask

Which returned more over the last year, OEF or SEIM?
In the year to Oct 9, 2026, with distributions reinvested, OEF returned +16.8% and SEIM +22.3%.
Which is cheaper, OEF or SEIM?
SEIM is cheaper, by 0.05 percentage points a year. That is about $5 on $10,000 held for a year. Fees come from each fund's prospectus.
How much do OEF and SEIM overlap with the S&P 500?
By their latest filed holdings, 100% of OEF and 89% of SEIM by weight is stocks the S&P 500 already holds.
Other comparisons
FDLO vs OEFFVAL vs OEFOEF vs TDVGFTGS vs OEFSEIM vs USMVRDVY vs SEIMDGRW vs SEIMCGDV vs SEIM
OEF on its own →SEIM on its own →Hold both: look the portfolio through →Rankings →Standards and sources →
Where these figures came from
OEF filings on SEC EDGAR ↗OEF prospectus with the expense ratio (SEC) ↗iShares page for OEF ↗SEIM filings on SEC EDGAR ↗SEIM prospectus with the expense ratio (SEC) ↗SEI website ↗

ETFIQ links to the documents behind every figure; a link is not an endorsement. A comparison is not a recommendation.

How this is computed

Overlap adds up the smaller of the two weights for each security both funds hold.

Cite this pageCitation, APA and Markdown

ETFIQ, OEF against SEIM, data as of Oct 9, 2026. https://etfiq.com/compare/any/oef-vs-seim

Open data

Free to use with attribution for figures ETFIQ computes; issuer data stays under its owner's terms.