ETF comparison · US core
SPY vs SPLG: overlap by weight, TER & holdings
SPDR S&P 500 ETF Trust vs SPDR Portfolio S&P 500 ETF
SPDR’s own cheap alternative to SPY. Identical index; SPLG charges a fraction of the fee and is the natural pick for buy-and-hold, while SPY keeps the options market and intraday liquidity.
SPLG also trades as SPYM (new ticker since Oct 2025).
SPY vs SPLG at a glance
| SPY | SPLG | |
|---|---|---|
| Fund | SPDR S&P 500 ETF Trust | SPDR Portfolio S&P 500 ETF |
| ISIN | US78462F1030 | US78464A8541 |
| Index | S&P 500 | S&P 500 |
| Market exposure | US large cap | US large cap |
| TER | 0.09% | 0.02% |
| Holdings in fund | 504 | 505 |
| Fund size | ≈ 795 bn USD | ≈ 80 bn USD |
| Domicile | the United States | the United States |
| Replication | Physical (full, unit trust) | Physical (full) |
| Use of income | Distributing | Distributing |
| Launched | Jan 22, 1993 | Nov 8, 2005 |
Top shared holdings
| SPY | SPLG | |
|---|---|---|
| NVDANVIDIA CORP | 8.07% | 8.59% |
| AAPLAPPLE INC | 7.52% | 6.8% |
| MSFTMICROSOFT CORP | 5.62% | 6.84% |
| AMZNAMAZON.COM INC | 3.74% | 3.8% |
| GOOGLALPHABET INC CL A | 3.09% | 2.71% |
| AVGOBROADCOM INC | 2.5% | 3.09% |
| METAMETA PLATFORMS INC CLASS A | 2.28% | 2.77% |
| GOOGALPHABET INC CL C | 2.47% | 2.18% |
| TSLATESLA INC | 1.57% | 2.2% |
| JPMJPMORGAN CHASE + CO | 1.42% | 1.43% |
| BRK.BBERKSHIRE HATHAWAY INC CL B | 1.42% | 1.48% |
| LLYELI LILLY + CO | 1.38% | 1.1% |
| VVISA INC CLASS A SHARES | 0.93% | 0.99% |
| XOMEXXONMOBIL HOLDINGS CORP | 1.03% | 0.84% |
| JNJJOHNSON + JOHNSON | 0.99% | 0.76% |
Weights per fund, normalized. 480 companies appear in both funds.
What the fee gap costs
Growth of 10,000 invested at 7% annual return, after each fund’s TER: 0.09% for SPY, 0.02% for SPLG.
| SPY | SPLG | Difference | |
|---|---|---|---|
| After 10 years | 19,498 | 19,635 | 136 |
| After 20 years | 38,019 | 38,552 | 533 |
| After 30 years | 74,131 | 75,697 | 1,566 |
SPLG comes out ahead by about 1,566 per 10,000 invested over 30 years. TER only. Trading spreads, taxes and broker fees are not included.
Domicile and withholding tax
Both funds are domiciled in the United States, so fund-level dividend withholding works the same way for both. Domicile does not separate this pair.
Frequently asked questions
Do SPY and SPLG overlap?+
Yes: 88.53% by weight, with 480 holdings appearing in both funds. 97.61% of SPY’s weight is also inside SPLG.
Do SPY and SPLG track the same index?+
Yes. Both funds track the same index: S&P 500. Return differences come from fees, replication and trading costs, not from index choice.
Which is cheaper, SPY or SPLG?+
SPLG: 0.02% per year against 0.09% for SPY. At 7% growth that gap is worth about 1,566 per 10,000 invested over 30 years.
Is it worth holding both SPY and SPLG?+
Holding both mostly duplicates exposure: 88.53% of the pair overlaps by weight. Most investors pick one, or combine one of them with a fund covering different markets.
More comparisons
Methodology
Overlap is the sum of min(weight A, weight B) across holdings that appear in both funds, with each fund’s stored weights normalized to 100%. Holdings come from issuer feeds and regulatory filings in our ETF holdings database; TER and fund size come from fund profile data and are refreshed regularly. Figures update when the underlying holdings data updates.
Holdings data as of Sep 21, 2026, from our ETF holdings database.