After-hours trading Monday featured plenty of widely held tech issues and a handful of strangers to the volume leader board in what amounted to a fairly slow session overall with little news to drive the action.

About 45 minutes into the extra session on Instinet, around 2.3 million shares had changed hands among the top-20 volume movers.

Schering-Plough

(SGP)

, the most active stock, was unchanged at $34.10. In regular trading, the drugmaker climbed 5.7%.

OSI Systems

(OSIS) - Get Report

was in second place on the volume leader board, where the shares ticked up 0.2% to $22.25.

Stellent

(STEL)

was flat at $19.24, and

Armor Holdings

(AH)

was unchanged at $23.33.

Zymogenetics

(ZGEN)

was also level with the 4 p.m. EST close at $9.35.

Intel

(INTC) - Get Report

and

Cisco

(CSCO) - Get Report

were each off 0.4%.

Ciena

(CIEN) - Get Report

,

Microsoft

(MSFT) - Get Report

and

Sun

(SUNW) - Get Report

were flat.

Ericsson

(ERICY)

was gaining 1.1% to $4.53, and

Oracle

(ORCL) - Get Report

was slipping 0.1% at $16.34.

Actrade

(ACRT)

was one of the biggest winners, trading up 11.1% to $15.27. During regular trading, the company's shares were pounded, dropping 45% to $13.75. The company issued a statement saying that it didn't know of any reason for the steep decline.