Tuesday's biggest movers: Cerebras Systems sinks 10.7% and Shopify rises 4.9%

Among US-listed companies worth at least $20 billion, the biggest moves in Tuesday's session (13 October) came from Cerebras Systems, which fell 10.7%, and Shopify, which rose 4.9%.

The decliners

Cerebras Systems (CBRS) fell 10.7% to $146.62. It was its biggest one-day drop since 12 October, based on the past year of closes. Coverage since the move includes 24/7 Wall St.'s headline “Cerebras Systems Cratered by 20% This Year: It’s Going to Double in Price According to This Respected Wall Street Analyst”.

Ciena (CIEN) fell 10.0% to $405.01. It was its biggest one-day drop since 3 September, based on the past year of closes. The shares are up 71.2% this year and 36.1% below their 52-week closing high. Coverage since the move includes TIKR's headline “Coherent Stock Falls Nearly 8% as Ciena and Lumentum Drop About 10%. Here’s Where the Stock Could Go by 2031”.

Lumentum (LITE) fell 9.8% to $995.41. It was its biggest one-day drop since 12 October, based on the past year of closes. The shares are up 168% this year and 12.8% below their 52-week closing high. Coverage since the move includes TIKR's headline “Coherent Stock Falls Nearly 8% as Ciena and Lumentum Drop About 10%. Here’s Where the Stock Could Go by 2031”.

Coherent (COHR) fell 7.9% to $288.02. It was its biggest one-day drop since 8 October, based on the past year of closes. The shares are up 57.1% this year and 32.1% below their 52-week closing high.

The gainers

Shopify (SHOP) rose 4.9% to $179.22. It was its biggest one-day gain since 12 October, based on the past year of closes. The shares are up 9.7% this year and 1.5% below their 52-week closing high. Coverage since the move includes Motley Fool's headline “MercadoLibre vs. Shopify: Which Consumer Stock Is a Better Buy in 2026?”.

Medtronic plc. (MDT) rose 3.9% to $91.93. It was its biggest one-day gain since 12 October, based on the past year of closes. The shares are down 3.2% this year and 11.8% below their 52-week closing high. Coverage since the move includes GlobeNewswire's headline “mHealth Solutions Market Forecasts Growth from $109.05B (2026) to $275.44B by 2031, Profiling Philips, Medtronic, Abbott, Dexcom, ResMed & 20 Other Key Players”.

YPF Sociedad Anonima (YPF) rose 3.9% to $51.97. It was its biggest one-day gain since 17 August, based on the past year of closes. The shares are up 43.3% this year and 10.1% below their 52-week closing high.

Vylor (VYLR) rose 3.7% to $75.89. On 13 October the company filed an 8-K in which it disclosed another material event.

The megacaps

Of the 12 most-watched names we track, 7 closed higher. Meta (META) did best at +2.63%, and Micron (MU) worst at -3.62%.