<div id="readability-page-1">06:36 AM EDT, 05/19/2026 (MT Newswires) -- The most-talked-about stocks in the Reddit subforum Wallstreetbets were mostly lower hours before Tuesday's opening bell.Sandisk ( SNDK ) fell by 3.3% premarket, after closing Monday with a 5.3% drop.Rocket Lab ( RKLB ) was down 2.5% in premarket hours, swinging from a 5.1% increase at Monday's close.Poet Technologies ( POET ) fell by 2.1% in pre-bell activity, following an 11% decline in the previous session.Micron Technology ( MU ) was 2% lower hours before market open, after a 6% decrease Monday.AST SpaceMobile ( ASTS ) declined by 1.7% pre-bell, swinging from a 3.8% rise in the previous session.Nvidia ( NVDA ) was down 0.8% premarket, following a 1.3% fall Monday.ServiceNow ( NOW ) rose by 4.4% in premarket activity, after an 8.8% increase in the previous session.Microsoft ( MSFT ) advanced by 0.6% pre-bell, following a 0.4% increase at Monday's close. MT Newswires does not provide investment advice. Unauthorized reproduction is strictly prohibited.</div>

RKLB

SNDK

POET

Premarket trading for Wallstreetbets stocks showed mostly declines, with Sandisk (SNDK) down 3.3%, Rocket Lab (RKLB) down 2.5%, and Poet Technologies (POET) down 2.1%. Micron Technology (MU) fell 2%, AST SpaceMobile (ASTS) declined 1.7%, and Nvidia (NVDA) was down 0.8%. In contrast, ServiceNow (NOW) rose 4.4%, and Microsoft (MSFT) advanced 0.6%.

- Notable stocks discussed on the Reddit subforum Wallstreetbets experienced declines ahead of Tuesday's market open.  
- Sandisk dropped by 3.3% in premarket trading, while Rocket Lab fell by 2.5%, see-sawing from earlier gains.  
- Conversely, ServiceNow and Microsoft reported gains of 4.4% and 0.6%, respectively, in pre-bell activity.

Fidelity

Micron Tech

ServiceNow

Rocket Lab

Sandisk

POET Tech

AST SpaceMobile

NVIDIA

Microsoft

Sandisk - WI

NVIDIA Corporation

Social Buzz: Wallstreetbets Stocks Mostly Lower Premarket Tuesday; Sandisk to Fall, ServiceNow to Rise