SPY vs SSAC overlap

63% by weight, as of September 24, 2026: heavy overlap. 440 companies appear in both funds; they make up 99% of SPY and 63% of SSAC.

The largest shared positions are NVDA, AAPL, MSFT, AMZN and GOOGL. Ranked by the smaller of the two weights, which is the part you would own twice.

Out of every $100 split evenly between them, about $63 (half in each fund) buys identical positions. The rest is exposure only one of the two funds gives you: 64 names only in SPY, 1,199 only in SSAC. Half in each behaves like 65 equally weighted stocks, against 44 for SPY alone and 99 for SSAC alone. Whether that duplication is a problem depends on the mix you want; this is a description, not advice.

Partly: 63% of the money in SSAC and SPY is the same, as of September 24, 2026. SSAC is iShares MSCI ACWI UCITS ETF (ISIN IE00B6R52259), an Irish-domiciled UCITS fund on the MSCI All Country World (ACWI) index. European brokers generally don't sell US-listed ETFs such as SPY to retail clients, because those funds publish no KID (the PRIIPs key information document); UCITS funds do.

Yes. SSAC also trades as ISAC (London, USD; Borsa Italiana, EUR) and IUSQ (Xetra, EUR). Each is the same portfolio in another currency, on another exchange or paying its dividends out, so SPY vs IUSQ also overlaps 63%.

For every company held by both funds we take the smaller of its two weights and add them up. The weights come from the full holdings files SPDR and iShares publish, not a top-10 sample, and companies are matched by their ISIN so share classes stay apart. Sector overlap applies the same rule to the issuers' sector labels; "behaves like N equally weighted stocks" is one over the sum of the squared weights.