Table:
| 2019 Performance Period | Revenue Performance Goal(in millions) | Operating Margin Performance Goal |
| --- | --- | --- |
| Q1 | $199.5 | 8.1% |
| Q2 | $211.7 | 8.3% |
| Q3 | $227.3 | 9.6% |
| Q4 | $243.2 | 10.8% |
Paragraphs:
1. 2019 Performance Periods and Performance Goals. For the calendar year 2019, there are four quarterly Performance Periods, ending on March 31, June 30, September 30 and December 31, 2019 (each, a “2019 Performance Period”). For each of the four 2019 Performance Periods, there are two equally weighted (50% each) performance goals (each, a “2019 Performance Goal”): Revenue and Operating Margin (each as defined below). The chart below set forth the Revenue and Operating Margin Performance Goals for the four 2019 Performance Periods.
“Revenue” means as to each of the 2019 Performance Periods, the Company’s net revenues generated from third parties, including both services revenues and product revenues as defined in the Company’s Form 10-K filed for the calendar year ended December 31, 2018. Net revenue is defined as gross sales less any pertinent discounts, refunds or other contra-revenue amounts, as presented on the Company’s press releases reporting its quarterly financial results.
“Operating Margin” means as to each of the 2019 Performance Periods, the Company’s non-GAAP operating income divided by its Revenue. Non-GAAP operating income means the Company’s Revenues less cost of revenues and operating expenses, excluding the impact of stock-based compensation expense, amortization of acquisition related intangibles, legal settlement related charges and as adjusted for certain acquisitions, as presented on the Company’s press releases reporting its quarterly financial results
Question:
When does each respective quarterly performance period end?
Answer: March 31, June 30, September 30, December 31