Netflix is raising its prices again, and the news sent the company’s stock up 6.5 percent Tuesday.

Netflix’s cheapest basic plan will cost $9, up from $8; its most popular HD standard plan will cost $13, up from $11; and its 4K premium plan will cost $16, up from $14.

The rate hikes constitute a jump of between 13 and 18 percent — the company’s biggest increase since launching its streaming service 12 years ago — and will take effect immediately for new customers. Existing subscribers will see the price increase on their bills over the next three months.