Check out the companies making headlines after the bell on Monday:

Virgin Galactic — Virgin Galactic fell more than 4% during extended trading after the space company reported a first-quarter loss of 55 cents per share versus a loss of 27 cents expected by analysts polled by Refinitiv. Virgin Galactic announced that it has yet to set a target date for its next spaceflight test, which the company has previously planned for this month.

Simon Property Group — The real estate owner and manager saw its stock retreat about 1% after the bell following its first-quarter earnings report. Simon reported first-quarter earnings of $1.36 per share on revenues of $1.15 billion. Analysts polled by Refinitiv had expected per-share earnings of 96 cents on revenues of $1.13 billion.

Wynn Resorts — Wynn shares advanced 2% despite reporting results that fell short of the Street’s expectations. The hotel operator reported a first-quarter loss of $2.41 per share on revenues of $726 million, both of which undershot estimates compiled by Refinitiv.

Roblox — Shares of the online gaming platform jumped 5% after it reported a first-quarter loss of 46 cents per share on revenues of $387 million. The company also said its average daily active users were 42.1 million during the quarter, up 79% year over year.

Affirm Holdings — Affirm dropped about 3% in extended trading after it reported a third-quarter loss of $1.06 per share on revenues of $230.7 million. Analysts had expected a loss per share of 29 cents on revenues of $198.2 million, per Refinitiv.