Bay Area technology companies have announced hundreds of layoffs in five San Francisco Bay Area cities, according to documents filed with the state in late September.

The five companies said they would permanently lay off 453 employees at multiple addresses in WARN notices received by the state on Sept. 25 and Sept. 27.

TTM Technologies said it would lay off 240 employees from a Santa Clara address. The layoffs at the advanced printed circuit board manufacturer will take effect on Oct. 16, according to the Sept. 25 notice.

Clari Inc. said it would lay off 139 employees from a Sunnyvale address. The revenue data management company's layoffs will go into effect on Oct. 15, according to the notice.

READ MORE: Another San Francisco Bay Area Tech Giant Will Lay Off Hundreds

Wolfspeed Inc. will lay off 50 employees from a Morgan Hill address. Those layoffs at the semiconductor developer and manufacturer will take effect Oct. 20, according to the notice.

BlackLine Systems Inc. said it would lay off 21 employees from a Pleasanton address. The cloud-based software platform for business management will take effect on Oct. 22, according to the notice.

Robinhood Markets Inc., a cryptocurrency and stock-trading financial management firm, will lay off three employees from a Menlo Park address. Two of those layoffs will take effect on Oct. 16, while one will take effect on Nov. 20, the notice states.

In early September, Cisco Systems Inc. announced it would permanently lay off 123 employees at a Milpitas address and 227 at a San Jose address. The layoffs will take effect on Oct. 16, according to the notice.

Tech layoffs appear to be slowing after a brutal year for the Bay Area’s tech-heavy economy. San Francisco tech companies laid off over 12,000 employees in January, a figure driven mainly by Salesforce’s decision to cut 8,000 employees that month. Yet layoffs have steadily slowed since then, with July reporting 1,178 layoffs.