If an ETL debates liquidating its fund, meaning its board says yes but the shareholders must still vote, and the ETF's price reflects the underlying value of the securities that it holds, what would cause the ETF to rise in value while the securities that it holds are not rising in value?
For an example, if an ETF chooses to liquidate its fund, and investors don't sell the ETF - in theory - they will receive the funds of the ETF as measured by the underlying price of the securities that it holds, such as the SPY ETF liquidating would still reflect the current value of the S&P 500 if it liquidated. Yet, using that theoretical SPY liquidation (not happening at all), if the SPY announced this, and it rose 10% while the S&P 500 did not, that seems to imply that the SPY ETF's price does not reflect the underlying securities.