Shopify (SHOP) shares tumbled 19% pre-bell after it reported Q3 adjusted earnings Tuesday of $0.49 per diluted share, compared with $0.34 a year earlier.

Analysts surveyed by FactSet expected $0.47.

Revenue for the quarter ended Sept. 30 was $3.74 billion, compared with $2.84 billion a year earlier.

Analysts surveyed by FactSet expected $3.77 billion.

The company said it expects Q4 revenue to grow at a low-thirties percentage rate on a year-over-year basis.