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SPYM vs THRO: Differences, Returns & Fees

SPYM and THRO hold 66% of their weight in the same names, and THRO returned +18.3% over the year. Net assets: $178.5bn on Oct 8, 2026 for State Street SPDR Portfolio S&P 500 ETF, and $7.5bn on Oct 9, 2026 for iShares U.S. Thematic Rotation Active ETF.

SPYM costs 0.55 points a year less; their one-year returns differ by 1.0 point; SPYM is far larger, $178.5bn against $7.5bn.

SPYM vs THRO: Differences, Returns & Fees
SPYMTHRO
Expense ratio0.02%0.57%
Net assets, as of Oct 8, 2026$178.5bn$7.5bn
Total return, 1 year+17.3%+18.3%
What it tracksS&P 500 Index ?No index, actively managed
Holdings in common66%
Top ten holdings, share of the fund39.0%43.5%

Holdings in common uses holdings dated Oct 8, 2026 and Oct 9, 2026.

+17.3%
SPYM total return, 1 year
+18.3%
THRO total return, 1 year
0.02%
SPYM expense ratio
0.57%
THRO expense ratio

What they hold in common

By the books each fund has filed, SPYM and THRO hold 66% 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 Oct 8, 2026 and Oct 9, 2026.

half

66% in common

Positions both hold, largest shared weight first
Holding SPYM THRO
NVIDIA CORP 8.33% 8.35%
APPLE INC 7.42% 8.22%
MICROSOFT CORP 5.79% 6.41%
AMAZON.COM INC 3.72% 4.63%
ALPHABET INC CL A 3.05% 3.85%
BROADCOM INC 2.56% 2.13%
META PLATFORMS INC CLASS A 2.37% 1.93%
ALPHABET INC CL C 2.45% 1.90%
MICRON TECHNOLOGY INC 1.75% 2.48%
ADVANCED MICRO DEVICES 1.51% 1.90%
TESLA INC 1.58% 1.39%
JPMORGAN CHASE + CO 1.31% 2.57%
Only in SPYM
ABBVIE INC 0.72%
MASTERCARD INC A 0.69%
GENERAL ELECTRIC 0.47%
NETFLIX INC 0.45%
WELLS FARGO + CO 0.37%
LINDE PLC 0.33%
AMGEN INC 0.33%
ANALOG DEVICES INC 0.29%
Only in THRO
CHECK POINT SOFTWARE TECHNOLOGIES 0.65%
MUELLER INDUSTRIES INC 0.25%
SS AND C TECHNOLOGIES HOLDINGS 0.23%
CHENIERE ENERGY 0.19%
ALCOA CORP 0.17%
HF SINCLAIR 0.16%
PERMIAN RESOURCES CLASS A 0.11%
TD SYNNEX 0.11%

Check overlap with more funds →

On the same fields

SPYM
State Street SPDR Portfolio S&P 500 ETF
THRO
iShares U.S. Thematic Rotation Active ETF
Where it sits Stock ETF Stock ETF
Issuer State Street iShares
What it is Tracks the S&P 500 Actively managed
Total return, 1 year +17.3% +18.3%
Its benchmark over the same days +17.3% (IVV) +17.3% (VOO)
Gap to its benchmark 0.0 pts vs IVV +1.0 pts vs VOO
Expense ratio 0.02% 0.57%
Already in the S&P 500 99.8% 92.8%
Holdings 506 247
Net assets, SPYM as of Oct 8, 2026 and THRO as of Oct 9, 2026 $178.5bn $7.5bn
Former ticker SPLG none

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

About SPYM

SPYM tracks the S&P 500. Over the year to Oct 9, 2026 it returned +17.3% with distributions reinvested, against +17.3% for its benchmark, the S&P 500 Index ?. The prospectus expense ratio is 0.02% 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 506 positions, with the top ten at 39.0%.

About THRO

THRO is actively managed and tracks no index. Over the year to Oct 9, 2026 it returned +18.3% with distributions reinvested, against +17.3% for its benchmark, the S&P 500 Index. The prospectus expense ratio is 0.57% a year. By its holdings published by its issuer for Oct 9, 2026, 93% of the fund by weight is stocks the S&P 500 also holds, across 247 positions, with the top ten at 43.5%.

Questions people ask

Which returned more over the last year, SPYM or THRO?
In the year to Oct 9, 2026, with distributions reinvested, SPYM returned +17.3% and THRO +18.3%.
Which is cheaper, SPYM or THRO?
SPYM 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 SPYM and THRO overlap with the S&P 500?
By their latest filed holdings, 100% of SPYM and 93% of THRO by weight is stocks the S&P 500 already holds.
Other comparisons
CGUS vs SPYMDFAU vs SPYMESGV vs SPYMAVUS vs SPYMTHRO vs VIGITOT vs THROTHRO vs VVIWB vs THRO
SPYM on its own →THRO on its own →Hold both: look the portfolio through →Rankings →Standards and sources →
Where these figures came from
SPYM filings on SEC EDGAR ↗SPYM prospectus with the expense ratio (SEC) ↗State Street website ↗THRO filings on SEC EDGAR ↗THRO prospectus with the expense ratio (SEC) ↗iShares page for THRO ↗

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, SPYM against THRO, data as of Oct 9, 2026. https://etfiq.com/compare/any/spym-vs-thro

Open data

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