Monday's biggest movers: MongoDB sinks 18.5% and Pershing Square jumps 5.4%

Among US-listed companies worth at least $20 billion, the biggest moves in Monday's session (28 September) came from MongoDB, which fell 18.5%, and Pershing Square, which rose 5.4%.

The decliners

MongoDB (MDB) fell 18.5% to $334.68 on volume 9.5 times its three-month average. It was its biggest one-day drop since 3 March, based on the past year of closes. The shares are down 20.3% this year and 29.1% below their 52-week closing high. On 28 September the company filed an 8-K in which it reported a director or officer change and published a Regulation FD disclosure. Coverage since the move includes GuruFocus.com's headline “MongoDB Stock Crashes Nearly 20% After CEO Desai Leaves to Meta”.

Gold Fields (GFI) fell 12.9% to $35.18 on volume 1.9 times its three-month average. It was its biggest one-day drop since 30 January, based on the past year of closes. The shares are down 19.4% this year and 42.8% below their 52-week closing high. Coverage since the move includes The Wall Street Journal's headline “Northern Star Rejects $27 Billion Takeover Proposal From Gold Fields”.

Nu (NU) fell 10.0% to $12.23 on volume 1.8 times its three-month average. It was its biggest one-day drop in the past year, based on the past year of closes. The shares are down 26.9% this year and 34.8% below their 52-week closing high. Coverage since the move includes Stocktwits's headline “Why Is NU Stock Slipping In Premarket Trading Today?”.

Roblox (RBLX) fell 9.9% to $41.86 on volume 1.5 times its three-month average. It was its biggest one-day drop since 31 July, based on the past year of closes. The shares are down 48.3% this year and 70.4% below their 52-week closing high. Coverage since the move includes Proactive's headline “Roblox cut to Underperform as Jefferies questions bookings”.

The gainers

Pershing Square (PS) rose 5.4% to $59.17 on volume 1.8 times its three-month average.

NetEase (NTES) rose 4.9% to $121.04. It was its biggest one-day gain since 21 August, based on the past year of closes. The shares are down 12.0% this year and 21.4% below their 52-week closing high. Coverage since the move includes Zacks's headline “Are Options Traders Betting on a Big Move in NetEase Stock?”.

Palo Alto Networks (PANW) rose 4.6% to $392.09. The shares are up 113% this year and 1.0% below their 52-week closing high. Coverage since the move includes GuruFocus.com's headline “Palo Alto Stock Gains 1.5% as Agent Security Adds Continuous Offense”.

The megacaps

Of the 12 most-watched names we track, 1 closed higher. The best was Nvidia (NVDA, +1.68%); the weakest was Meta (META, -4.79%). For Meta it was its biggest one-day drop since 30 July.

Moves in the next session will show up on our movers page, which refreshes with each run. Each name linked above has its own page with price history, the latest SEC filing and the next earnings date.