Shares of Party City Holdco Inc. PRTY, +1.28% plummeted 41% in premarket trading, putting them on track to open at a record low, after the party goods retailer reported a surprise third-quarter loss, revenue that fell more than expected and cut its full-year outlook, citing negative effects of helium shortages and weak Halloween sales. The company reported late-Wednesday a net loss that widened to $39.7 million, or $3.02 a share, from a loss of $2.0 million, or 3 cents a share, in the year-ago period. Excluding non-recurring items, such as charges relate to its store-optimization program, the adjusted loss per share was 28 cents, compared with the FactSet consensus of breakeven. Revenue fell 2.3% to $540.2 million, below the FactSet consensus of $551.0 million. Branded same-store sales decreased 2.6%, with a 210 basis point (2.1 percentage points) headwind from the helium shortage. Halloween product sales for the quarter and the month of October combined fell 3.2%. The company cut its 2019 guidance ranges for adjusted EPS to 84 cents to 91 cents from $1.26 to $1.36 and for revenue to $2.35 billion to $2.38 billion from $2.40 billion to $2.45 billion. The stock had tumbled 39% year to date through Wednesday, while the SPDR S&P Retail ETF XRT, -0.07% had advanced 9.2% and the S&P 500 SPX, -0.20% had climbed 23%.