Company: BL
Filing Date: 2025-03-27
Form Type: DEF 14A
Source: 0001666134-25-000011
Chunk: 100

Company: BLACKLINE, INC.
Filing Date: 2025-03-27
Form: DEF 14A
Chunk 100
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 the shares of our common stock they represent in accordance with their own judgment on such matters. Discretionary authority with respect to such other matters is granted by a properly submitted proxy.

It is important that your shares be represented at the 2025 annual meeting, regardless of the number of shares that you hold. You are, therefore, urged to vote as promptly as possible to ensure your vote is recorded.

### THE BOARD OF DIRECTORS
Woodland Hills, California

March 27, 2025

<div align='center'>74</div>

TABLE OF CONTENTS

#### Appendix A

### Unaudited Reconciliation of Non-GAAP Financial Measures
<div align='center'>(in thousands, except percentages)</div>

|                                                  |     | Year Ended December 31, 
 2024                    |      |         |     | 2023 |      |         |
|:-------------------------------------------------|:----|:------------------------|-----:|--------:|:----|:-----|-----:|--------:|
| Non-GAAP Operating Income:                       |     |                         |      |         |     |      |      |         |
| Operating income                                 |     | $                       |      |  18,536 |     | $    |      |  14,348 |
| Amortization of intangible assets                |     |                         |      |  19,886 |     |      |      |  20,608 |
| Stock-based compensation                         |     |                         |      |  86,097 |     |      |      |  80,068 |
| Change in fair value of contingent consideration |     |                         |      |       — |     |      |      | -33,549 |
| Transaction-related costs                        |     |                         |      |     568 |     |      |      |   5,078 |
| Restructuring costs                              |     |                         |      |   1,720 |     |      |      |  10,964 |
| Total non-GAAP operating income                  |     | $                       |      | 126,807 |     | $    |      |  97,517 |
| GAAP operating margin                            |     |                         |  2.8 |       % |     |      |  2.4 |       % |
| Non-GAAP operating margin                        |     |                         | 19.4 |       % |     |      | 16.5 |