Immediately following the block in XLU was a massive call trade in the XLI Industrials ETF on the NYSE-Arca exchange, suggesting the same player buying upside in this sector as well. Buyer paid 30cents for 250,000 April 18 calls, also to open, in a position somewhat larger and a bit further out of the money than that traded in XLU. Both XLI and XLU prints are largest ever traded in those securities