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IDEV vs MFSI: Differences, Returns & Fees

IDEV and MFSI hold 15% of their weight in the same names, and IDEV returned +14.5% over the year. Net assets: $33.1bn on Oct 9, 2026 for iShares Core MSCI International Developed Markets ETF, and $1.1bn on May 31, 2026 for MFS Active International ETF.

IDEV costs 0.55 points a year less; their one-year returns differ by 3.2 points.

IDEVMFSI
Expense ratio0.04%0.59%
Net assets, IDEV as of Oct 9, 2026 and MFSI as of May 31, 2026$33.1bn$1.1bn
Total return, 1 year+14.5%+11.3%
What it tracksMSCI World ex USA Investable Market IndexNo index, actively managed
Holdings in common15%
Top ten holdings, share of the fund10.8%27.9%
Below its high4.9%, high on Aug 25, 20263.4%, high on Aug 10, 2026

Holdings in common uses holdings dated May 31, 2026 and Oct 8, 2026.

+14.5%
IDEV total return, 1 year
+11.3%
MFSI total return, 1 year
0.04%
IDEV expense ratio
0.59%
MFSI expense ratio

What they hold in common

By the books each fund has filed, IDEV and MFSI hold 15% 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 May 31, 2026 and Oct 8, 2026.

half

15% in common

Positions both hold, largest shared weight first
Holding IDEV MFSI
NOVARTIS AG 0.92% 1.80%
SAP 0.75% 1.25%
ROYAL BANK OF CANADA 0.93% 0.66%
TOTALENERGIES 0.60% 1.69%
NESTLE SA 0.83% 0.60%
SCHNEIDER ELECTRIC 0.57% 1.99%
HITACHI 0.55% 1.99%
SUMITOMO MITSUI FINANCIAL GROUP 0.54% 1.26%
ROLLS-ROYCE HOLDINGS PLC 0.53% 1.78%
UBS GROUP AG 0.52% 1.20%
BANCO BILBAO VIZCAYA ARGENTARIA SA 0.51% 0.53%
SONY GROUP 0.48% 1.01%
Only in IDEV
ASML HOLDING 2.52%
HSBC HOLDINGS PLC 1.11%
ROCHE PS PAR AG 1.05%
SHELL 1.02%
ASTRAZENECA PLC 0.84%
MITSUBISHI UFJ FINANCIAL GROUP 0.84%
BHP GROUP LTD 0.77%
SIEMENS N AG 0.76%
Only in MFSI
Taiwan Semiconductor Manufacturing Co Ltd 7.86%
Samsung Electronics Co Ltd 4.02%
Tencent Holdings Ltd 2.26%
Air Liquide SA 2.10%
Cie Financiere Richemont SA 1.90%
Toronto-Dominion Bank/The 1.74%
Eni SpA 1.60%
Intesa Sanpaolo SpA 1.59%

Check overlap with more funds →

On the same fields

IDEV
iShares Core MSCI International Developed Markets ETF
MFSI
MFS Active International ETF
Where it sits Stock ETF Stock ETF
Issuer iShares MFS
What it is Tracks the MSCI International Developed Markets Actively managed
Total return, 1 year +14.5% +11.3%
S&P 500 over the same days +17.3% +17.3%
Gap to the S&P 500 −2.7 pts −6.0 pts
Expense ratio 0.04% 0.59%
Already in the S&P 500 0.0% 0.0%
Holdings 2287 93
Net assets, IDEV as of Oct 9, 2026 and MFSI as of May 31, 2026 $33.1bn $1.1bn

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

IDEV in plain words

IDEV tracks the MSCI International Developed Markets. Over the year to Oct 9, 2026 it returned +14.5% with distributions reinvested, against +17.3% for the S&P 500. The prospectus expense ratio is 0.04% a year. By its holdings published by its issuer for Oct 8, 2026, 0% of the fund by weight is stocks the S&P 500 also holds, across 2,287 positions, with the top ten at 10.8%. It sat 4.9% below its high of Aug 25, 2026 on Oct 9, 2026.

MFSI in plain words

MFSI is actively managed and tracks no index. Over the year to Oct 9, 2026 it returned +11.3% with distributions reinvested, against +17.3% for the S&P 500. The prospectus expense ratio is 0.59% a year. By its holdings filed for May 31, 2026, 0% of the fund by weight is stocks the S&P 500 also holds, across 93 positions, with the top ten at 27.9%. It sat 3.4% below its high of Aug 10, 2026 on Oct 9, 2026.

Questions people ask

Which returned more over the last year, IDEV or MFSI?
In the year to Oct 9, 2026, with distributions reinvested, IDEV returned +14.5% and MFSI +11.3%.
Which is cheaper, IDEV or MFSI?
IDEV is cheaper, by 0.55 percentage points a year. That is about $55 on $10,000 held for a year. Fees come from each fund's prospectus.
How much do IDEV and MFSI overlap with the S&P 500?
By their latest filed holdings, 0% of IDEV and 0% of MFSI by weight is stocks the S&P 500 already holds.
Other comparisons
IDEV vs IQDFDMXF vs IDEVGSID vs IDEVBKIE vs IDEVACWX vs MFSIDFAI vs MFSIIQLT vs MFSICORO vs MFSI
IDEV on its own →MFSI on its own →Hold both: look the portfolio through →Rankings →Standards and sources →
Where these figures came from
IDEV filings on SEC EDGAR ↗IDEV prospectus with the expense ratio (SEC) ↗iShares page for IDEV ↗MFSI filings on SEC EDGAR ↗MFSI prospectus with the expense ratio (SEC) ↗MFS 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, IDEV against MFSI, data as of Oct 9, 2026. https://etfiq.com/compare/any/idev-vs-mfsi

Open data

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