AltShares Merger Arbitrage ETF (NYSE Arca: ARB) is an established merger arbitrage ETF. The ETF seeks to track the Water Island Merger Arbitrage USD Hedged Index, which focuses on publicly announced mergers and acquisitions.The ARB ticker can create confusion because Arbitrum (CRYPTO: ARB) uses the same symbol in the cryptocurrency market.Separately, Standard Chartered (LSE: STAN) has issued a bullish long-term target for Arbitrum, but that forecast applies to the crypto token, not the ETF.AltShares Merger ...