IVOO vs SPY: Holdings Overlap
IVOOVanguard S&P Mid-cap 400 Index Fund
Vanguard · 400 holdings · $3.9B · as of 2026-05-31
SPYState Street® SPDR® S&P 500® ETF Trust
State Street (SPDR) · 504 holdings · $812.0B · as of 2026-08-06
Holdings snapshots are 67 days apart (IVOO: 2026-05-31, SPY: 2026-08-06). Weights and index membership change between snapshots, so the true current overlap is typically higher than shown. For funds tracking the same index, the gap can be 5–15 points.
How similar are IVOO and SPY?
Vanguard S&P Mid-cap 400 Index Fund (IVOO, by Vanguard) holds 400 positions; State Street® SPDR® S&P 500® ETF Trust (SPY, by State Street (SPDR)) holds 504. They have 1 holdings in common, and by portfolio weight the two funds are 0.1% identical. In practical terms the pair is essentially distinct, holding almost none of the same securities.
- Overlap by Weight
- 0.1%Sum of the smaller weight of each shared holding
- Shared Holdings
- 1IVOO holds 400 · SPY holds 504
- Weight in Shared Holdings
- IVOO 2%·SPY 0%Share of each fund's weight in stocks both funds own
Based on each fund's latest official holdings. How is this calculated?
What makes each fund different
Only in IVOO
399 of 400 positions (98.3% of the fund) are not held by SPY. Showing the top 30 by weight.
Sector Breakdown
| Sector | IVOO | SPY |
|---|---|---|
| Information Technology | 15.7% | 37.6% |
| Industrials | 25.6% | 8.8% |
| Financials | 14.3% | 12.3% |
| Consumer Discretionary | 11.1% | 9.3% |
| Communication Services | 1.0% | 9.7% |
| Other Sectors | 32.2% | 22.3% |
Share of each fund's portfolio weight by GICS-style sector, compiled from issuer fund data and our own classification of the holdings, not the issuers' published sector charts.
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| IVOO | +3.1% | +18.5% | +26.0% | +14.6% | +9.0% | +11.2% | 1.14% |
| SPY | +3.4% | +14.0% | +23.7% | +21.2% | +13.3% | +15.3% | 0.97% |
Total returns including dividends, from adjusted daily closes as of 2026-08-07. 3Y/5Y/10Y are annualized. Yield is trailing-12-month distributions over the last close. Past performance does not predict future results.
Project the growth of $10,000 in IVOO vs SPY →
Shared Holdings(1)
 FLEXFlex Ltd. COM USD0.01 | 1.58% | 0.07% | 0.07% |
|---|
Frequently Asked Questions
How much do IVOO and SPY overlap?
IVOO and SPY overlap by 0.1% of portfolio weight. They share 1 holdings (IVOO holds 400 positions and SPY holds 504), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IVOO and SPY?
The two portfolios are 0.1% identical by weight. Owning both is genuine diversification: the funds hold almost none of the same securities.
What are the biggest shared holdings of IVOO and SPY?
The largest positions held by both funds are FLEX. Together the top 1 shared positions account for 97% of the total overlap.
What does IVOO own that SPY doesn't?
399 positions (98.3% of IVOO) are unique to IVOO, led by TWLO, FTI and CW. In the other direction, 503 positions (99.8% of SPY) are unique to SPY.