Percentage of shares acquired

[Table of Contents](#i3944da1428384b81954c2cd4a4fd88bf_7)On October 1, 2021, we acquired 100% of the shares of Zemax, a leader in high-performance optical imaging system simulation, for a purchase price of $411.5 million, paid in cash, or $399.1 million net of cash acquired from Zemax. The acquisition expanded the scope of our optical and photonics simulation portfolio by giving users comprehensive solutions that can drive innovation in healthcare, autonomy, consumer electronics and the industrial internet of things (IIoT).Additionally, during the year ended December 31, 2021, we completed several other acquisitions to expand our solution offerings and enhance our customers' experience. These acquisitions were not individually significant. The combined purchase price of these acquisitions during the year ended December 31, 2021 was $110.7 million, which was paid in cash.The operating results of each acquisition have been included in our condensed consolidated financial statements since each respective date of acquisition.See Note 16, Subsequent Event, for information on our recent acquisition completed subsequent to the end of the period covered by this report.5.Other Receivables and Current Assets and Other Accrued Expenses and LiabilitiesOur other receivables and current assets and other accrued expenses and liabilities comprise the following balances:

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| (in thousands) | September 30,2022 |  | December 31,2021 |
| Receivables related to unrecognized revenue | $ | 129,721  |  |  | $ | 200,888  |  |
| Income taxes receivable, including overpayments and refunds | 31,411  |  |  | 71,332  |  |
| Prepaid expenses and other current assets | 53,434  |  |  | 52,435  |  |
| Total other receivables and current assets | $ | 214,566  |  |  | $ | 324,655  |  |
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| Accrued vacation | 38,084  |  |  | 35,879  |  |
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| Consumption, VAT and sales tax liabilities | 25,741  |  |  | 52,630  |  |
| Accrued expenses and other current liabilities | 96,868  |  |  | 116,000  |  |
| Total other accrued expenses and liabilities | $ | 160,693  |  |  | $ | 204,509  |  |
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Receivables related to unrecognized revenue represent the current portion of billings made for customer contracts that have not yet been recognized as revenue.6.Earnings Per ShareBasic earnings per share (EPS) amounts are computed by dividing earnings by the weighted average number of common shares outstanding during the period. Diluted EPS amounts assume the issuance of common stock for all potentially dilutive equivalents outstanding. To the extent stock awards are anti-dilutive, they are excluded from the calculation of diluted EPS.The details of basic and diluted EPS are as follows:

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|   | Three Months Ended |  | Nine Months Ended |
| (in thousands, except per share data) | September 30,2022 |  | September 30,2021 |  | September 30,2022 |  | September 30,2021 |
| Net income | $ | 95,975  |  |  | $ | 85,342  |  |  | $ | 265,763  |  |  | $ | 251,456  |  |
| Weighted average shares outstanding – basic | 87,063  |  |  | 87,239  |  |  | 87,062  |  |  | 87,072  |  |
| Dilutive effect of stock plans | 355  |  |  | 930  |  |  | 434  |  |  | 997  |  |
| Weighted average shares outstanding – diluted | 87,418  |  |  | 88,169  |  |  | 87,496  |  |  | 88,069  |  |
| Basic earnings per share | $ | 1.10  |  |  | $ | 0.98  |  |  | $ | 3.05  |  |  | $ | 2.89  |  |
| Diluted earnings per share | $ | 1.10  |  |  | $ | 0.97  |  |  | $ | 3.04  |  |  | $ | 2.86  |  |
| Anti-dilutive shares | 54  |  |  | 32  |  |  | 366  |  |  | 30  |  |

  
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