The financial guidance below reflects the Company's current estimates of the impacts of the global pandemic and trade restrictions. This guidance is based on the Company's evaluation of factual information it has determined to be relevant and the application of certain assumptions made by the Company. Please refer to the Company's prepared remarks document for additional information regarding the Company's financial guidance, including its assumptions regarding overall business dynamics and the economic impacts of COVID-19 and trade restrictions.
In addition, the financial guidance includes the expected impact of the Company's acquisition of Zemax, which closed on October 1, 2021. The acquisition is not expected to have a meaningful impact on the Company's 2021 results.
/ Fourth Quarter 2021 Guidance
The Company currently expects the following for the quarter ending December 31, 2021:
| (in millions, except percentages and per share data) | GAAP | Non-GAAP | |||||||||||||
| Revenue | $609.3 | - | $649.3 | $614.9 | - | $654.9 | |||||||||
| Revenue Growth Rate | (2.3 %) | - | 4.1 % | (2.1 %) | - | 4.3 % | |||||||||
| Revenue Growth Rate — Constant Currency | (0.7 %) | - | 5.9 % | (0.4 %) | - | 6.0 % | |||||||||
| Diluted earnings per share | $1.88 | - | $2.25 | $2.48 | - | $2.81 | |||||||||
/ Fiscal Year 2021 Guidance
The Company currently expects the following for the fiscal year ending December 31, 2021:
| (in millions, except percentages and per share data) | GAAP | Non-GAAP | |||||||||||||
| Revenue | $1,860.3 | - | $1,900.3 | $1,885.0 | - | $1,925.0 | |||||||||
| Revenue Growth Rate | 10.6 % | - | 13.0 % | 11.2 % | - | 13.5 % | |||||||||
| Revenue Growth Rate — Constant Currency | 10.0 % | - | 12.4 % | 10.6 % | - | 12.9 % | |||||||||
| Diluted earnings per share | $4.74 | - | $5.11 | $7.05 | - | $7.38 | |||||||||
The difference between the GAAP and non-GAAP revenue guidance presented above is a result of the expected impact of the application of the fair value provisions applicable to the accounting for business combinations in the amount of $5.6 million for the fourth quarter and $24.7 million for FY 2021, which are inclusive of the expected impact from the Zemax acquisition.
