Apple has lost its top spot in research firm Canalys’s rankings of the biggest computer makers. Hewlett-Packard retook its lead in the client PC market, the firm said.

The Cuperino, Calif.-based company had been at the top thanks to strong holiday-quarter iPad sales, which fell off in the first quarter of 2012.

Lenovo, Acer and Dell took the remaining spots in the top five.

Tablets are definitely becoming a more important part of the PC market. While desktop sales rose 11 percent and laptop sales grew 8 percent last quarter, tablet sales were up 200 percent compared to the same period last year.

Apple and Amazon led the way in tablet shipments, said Canalys Research analyst Tom Evans in a release. As for the rest of the field, “Samsung and Lenovo are two that stand out in terms of substantially increasing overall volume, though Asus has performed well too,” he said.

While the growing tablet market hasn’t meant a drop-off in desktops and laptops, it does , however, appear to be growing at the expense of netbooks. The firm reported that that market saw a 34 percent decline — its sixth straight drop.

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