In Q4, Costco’s core merchandise saw gross margin pressure (-0.4 percentage points compared to +0.4 improvement in nine months of fiscal 2021) due to inflation. [Updated: 10/26/21] COST Stock Update Costco (NASDAQ: COST)  released its Q4 report, wherein revenues came in flat and earnings per share (EPS) came in 4% above the Trefis estimates. To add to this, Costco saw a 12% growth in membership fee revenues in Q4.