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SEIM vs VOO: Differences, Returns & Fees

SEIM and VOO hold 29% of their weight in the same names, and SEIM returned +22.3% over the year. Net assets: $1.5bn on Jun 30, 2026 for SEI Enhanced U.S. Large Cap Momentum Factor ETF, and $1.0tn on Sep 30, 2026 for Vanguard S&P 500 ETF.

VOO costs 0.12 points a year less; their one-year returns differ by 5.0 points; VOO is far larger, $1.67tn against $1.5bn.

SEIMVOO
Expense ratio0.15%0.03%
Net assets, as of Jun 30, 2026$1.5bn$1.67tn
Total return, 1 year+22.3%+17.3%
What it tracksNo index, actively managedS&P 500 Index
Holdings in common29%
Top ten holdings, share of the fund37.6%37.8%

Holdings in common uses holdings dated Jun 30, 2026 and Aug 31, 2026.

+22.3%
SEIM total return, 1 year
+17.3%
VOO total return, 1 year
0.15%
SEIM expense ratio
0.03%
VOO expense ratio

What they hold in common

By the books each fund has filed, SEIM and VOO 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 Aug 31, 2026.

half

29% in common

Positions both hold, largest shared weight first
Holding SEIM VOO
NVIDIA CORPORATION 6.24% 8.09%
ALPHABET INC. 7.00% 3.01%
APPLE INC. 2.90% 7.04%
MICROSOFT CORPORATION 2.66% 5.70%
MICRON TECHNOLOGY, INC. 2.98% 1.64%
AMAZON.COM, INC. 1.05% 3.85%
JOHNSON & JOHNSON 2.48% 0.97%
VISA INC. 2.84% 0.93%
WALMART INC. 0.69% 0.69%
CISCO SYSTEMS, INC. 1.81% 0.66%
PALANTIR TECHNOLOGIES INC. 0.72% 0.65%
LAM RESEARCH CORPORATION 3.86% 0.57%
Only in SEIM
NVENT ELECTRIC PUBLIC LIMITED COMPANY 1.77%
WOODWARD, INC. 1.70%
TD SYNNEX CORPORATION 1.40%
ITT INC. 1.18%
CURTISS-WRIGHT CORPORATION 0.94%
MASTEC, INC. 0.73%
FIVE BELOW, INC. 0.65%
Astera Labs, Inc 0.62%
Only in VOO
Meta Platforms Inc 1.90%
Tesla Inc 1.57%
JPMorgan Chase & Co 1.44%
Berkshire Hathaway Inc 1.40%
Eli Lilly & Co 1.38%
Advanced Micro Devices Inc 1.16%
ExxonMobil Holdings Corp 1.01%
Mastercard Inc 0.72%

Check overlap with more funds →

On the same fields

SEIM
SEI Enhanced U.S. Large Cap Momentum Factor ETF
VOO
Vanguard S&P 500 ETF
Where it sits Stock ETF Stock ETF
Issuer SEI Vanguard
What it is Actively managed Tracks the S&P 500
Total return, 1 year +22.3% +17.3%
S&P 500 over the same days +17.3% +17.3%
Gap to the S&P 500 +5.0 pts +0.1 pts
Expense ratio 0.15% 0.03%
Already in the S&P 500 89.4% 99.7%
Holdings 71 507
Net assets, SEIM as of Jun 30, 2026 and VOO as of Sep 30, 2026 $1.5bn $1.0tn

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

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%.

VOO in plain words

VOO tracks the S&P 500. Over the year to Oct 9, 2026 it returned +17.3% with distributions reinvested, against +17.3% for the S&P 500. The prospectus expense ratio is 0.03% a year. By its holdings published by its issuer as of Aug 31, 2026, 100% of the fund by weight is stocks the S&P 500 also holds, across 507 positions, with the top ten at 37.8%.

Questions people ask

Which returned more over the last year, SEIM or VOO?
In the year to Oct 9, 2026, with distributions reinvested, SEIM returned +22.3% and VOO +17.3%.
Which is cheaper, SEIM or VOO?
VOO is cheaper, by 0.12 percentage points a year. That is about $12 on $10,000 held for a year. Fees come from each fund's prospectus.
How much do SEIM and VOO overlap with the S&P 500?
By their latest filed holdings, 89% of SEIM and 100% of VOO by weight is stocks the S&P 500 already holds.
Other comparisons
IVV vs SEIMSEIM vs SPYSEIM vs VTIIWB vs SEIMUSXF vs VOODFAL vs VOOCATH vs VOOFDLO vs VOO
SEIM on its own →VOO on its own →Hold both: look the portfolio through →Rankings →Standards and sources →
Where these figures came from
SEIM filings on SEC EDGAR ↗SEIM prospectus with the expense ratio (SEC) ↗SEI website ↗VOO filings on SEC EDGAR ↗VOO prospectus with the expense ratio (SEC) ↗Vanguard page for VOO ↗

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

Open data

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