The Gold Trust fund is an exchange traded fund (ETF) within the iShares family. There are at least 2 funds that are incredibly highly correlated with IAU.

Within the iShares family of funds, the most positively correlated other funds are MSCI Global Silver Miners ETF, MSCI Global Gold Miners ETF, TIPS Bond ETF, Silver Trust, 1-3 Year Treasury Bond ETF.

Outside of the iShares family, the most positively correlated other funds are SPDR - Gold Shares, PowerShares - DB Gold Fund, PowerShares - DB Precious Metals Fund, Vanguard Mutual Funds - Inflation-Protected Securities, Vanguard Mutual Funds - Short-Term Federal.

Extremely Similar Funds

There are multiple other funds which have extremely high correlation to iShares's Gold Trust fund.
100.0% GLD SPDR Gold Shares
99.3% DGL PowerShares DB Gold Fund

Performance for the previous 2 years

Positively Correlated iShares ETFs
SLVP iShares MSCI Global Silver Miners ETF 98.2%
RING iShares MSCI Global Gold Miners ETF 98.0%
TIP iShares TIPS Bond ETF 88.4%
SLV iShares Silver Trust 86.8%
SHY iShares 1-3 Year Treasury Bond ETF 86.0%
Negatively Correlated iShares funds
URTH iShares MSCI World ETF -89.7%
EFAV iShares MSCI EAFE Minimum Volatility ETF -88.8%
USMV iShares MSCI USA Minimum Volatility ETF -88.7%
EDEN iShares MSCI Denmark Capped ETF -88.4%
ACWV iShares MSCI All Country World Minimum Volatility ETF -88.0%

Positively Correlated Non-iShares funds
GLD SPDR Gold Shares 100.0%
DGL PowerShares DB Gold Fund 99.3%
DBP PowerShares DB Precious Metals Fund 97.5%
VIPSX Vanguard Mutual Funds Inflation-Protected Securities 88.2%
VSGBX Vanguard Mutual Funds Short-Term Federal 86.8%
Negatively Correlated Non-iShares funds
KBWR PowerShares KBW Regional Bank Portfolio -92.9%
XSW SPDR S&P Software & Services -92.6%
KBWB PowerShares KBW Bank Portfolio -92.4%
XAR SPDR S&P Aerospace & Defense -92.2%
VMVAX Vanguard Mutual Funds Mid-Cap Value Index Admiral -92.0%

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