# EDGAR Filing Document

**Accession Number:** 0001819438
**File Stem:** 0001628280-23-005826
**Filing Date:** 2023-3
**Character Count:** 25903
**Document Hash:** 2d0a02ae61a8ad30fa061fda7f65db0b
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001628280-23-005826.hdr.sgml**: 20230301

**ACCESSION NUMBER**: 0001628280-23-005826

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 15

**CONFORMED PERIOD OF REPORT**: 20230301

**ITEM INFORMATION**: Results of Operations and Financial Condition

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20230301

**DATE AS OF CHANGE**: 20230301

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ESS Tech, Inc.
- **CENTRAL INDEX KEY:** 0001819438
- **STANDARD INDUSTRIAL CLASSIFICATION:** MISCELLANEOUS ELECTRICAL MACHINERY, EQUIPMENT & SUPPLIES [3690]
- **IRS NUMBER:** 000000000
- **STATE OF INCORPORATION:** E9
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-39525
- **FILM NUMBER:** 23693521

**BUSINESS ADDRESS:**
- **STREET 1:** 26440 SW PARKWAY AVE.
- **STREET 2:** BLDG. 83
- **CITY:** WILSONVILLE
- **STATE:** OR
- **ZIP:** 97070
- **BUSINESS PHONE:** (855) 423-9920

**MAIL ADDRESS:**
- **STREET 1:** 26440 SW PARKWAY AVE.
- **STREET 2:** BLDG. 83
- **CITY:** WILSONVILLE
- **STATE:** OR
- **ZIP:** 97070

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** ACON S2 Acquisition Corp.
- **DATE OF NAME CHANGE:** 20200728

?xml version="1.0" ? wk-20230301

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

**FORM 8-K**

**CURRENT REPORT**

**Pursuant to Section 13 or 15(d)**

**of the Securities Exchange Act of 1934**

**Date of report (Date of earliest event reported): March 1, 2023**

**ESS TECH, INC.**

**(Exact Name of Registrant as Specified in Charter)**

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| | | |
|:---|:---|:---|
| **Delaware** | **001-39525** | **98-1550150** |
| **(State or other jurisdiction**<br>**of incorporation)** | **(Commission**<br>**File Number)** | **(I.R.S. Employer**<br>**Identification Number)** |

---

---

| | |
|:---|:---|
| **26440 SW Parkway Ave., Bldg. 83**<br>**Wilsonville, Oregon** | **97070** |
| **(Address of principal executive offices)** | **(Zip code)** |

---

**(855) 423-9920**

**(Registrant's telephone number, including area code)**

**Not Applicable**

**(Former name or former address, if changed since last report)**

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the Registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

**Securities registered pursuant to Section 12(b) of the Act:**

---

| | | |
|:---|:---|:---|
| **Title of each class** | **Trading**<br>**Symbol(s)** | **Name of each exchange**<br>**on which registered** |
| **Common Stock, $0.0001 par value per share** | **GWH** | **The New York Stock Exchange** |
| **Warrants, each whole warrant exercisable for one share of common stock at an exercise price of $11.50** | **GWH.W** | **The New York Stock Exchange** |

---

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2).

Emerging growth company ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

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**Item 2.02&nbsp;&nbsp;&nbsp;&nbsp;Results of Operations and Financial Condition.** 

On March 1, 2023, ESS Tech, Inc. issued a press release announcing financial results for the quarter and year ended December 31, 2022. A copy of the press release is furnished as <u>Exhibit 99.1</u> to this Current Report on Form 8-K and is incorporated herein by reference.

The information furnished in this Item 2.02 and <u>Exhibit 99.1</u> of this Current Report on Form 8-K shall not be deemed to be "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "**Exchange Act**"), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing.

**Item 9.01&nbsp;&nbsp;&nbsp;&nbsp;Financial Statements and Exhibits** 

*(d) Exhibits* 

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| | |
|:---|:---|
| **Exhibit**<br>**No.** | |
| 99.1 | <u>[Press release, dated March 1, 2023](earningsrelease2022.htm)</u> |
| 104 | Cover page interactive data file |

---

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**SIGNATURE** 

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized.

Dated: March 1, 2023

---

| | |
|:---|:---|
| **ESS TECH, INC.** | **ESS TECH, INC.** |
| By: | /s/ Anthony Rabb |
| Name: | Anthony Rabb |
| Title: | Chief Financial Officer |

---

## Exhibit 99.1

**Exhibit 99.1**![esslogo.jpg](esslogo.jpg)

**ESS Tech, Inc. Announces Fourth Quarter and Full Year 2022 Financial Results**

**Record Unit Deliveries in Q4**

**Ended Full Year 2022 with Almost 800 MWhs of Annual Production Capacity**

**WILSONVILLE, OREGON** – March 1, 2023 – ESS Tech, Inc. ("ESS," "ESS, Inc." or the "Company") (NYSE:GWH), a leading manufacturer of long-duration energy storage systems for commercial and utility-scale applications, today announced financial results for its fourth quarter and full year ended December 31, 2022.

"2022 was a transformative year for ESS. We signed landmark deals with the Sacramento Municipal Utility District and ESIAP along with many other wins with utilities, developers and unlocked new applications such as airport decarbonization that we believe hold the promise of considerable upside. We made great progress building out the team and transformed our manufacturing operations and customer success teams. In doing so and with the addition of a semi-automated and fully automated line, we were able to surpass a key operational goal, achieving nearly 800 MWhs of annual capacity by year end. While we continued to be challenged by supply throughout the year that hindered our ability to fully achieve our delivery ambitions for the year, we were able deliver a record 14 Energy Warehouses in the fourth quarter," said Eric Dresselhuys, CEO of ESS. "As we move into 2023, we expect to continue our progress in the market and with our operations. With that said, we plan to take a more calculated approach to scaling the business this year where we leverage our team's expertise to improve processes, optimize the supply base and further drive down costs. With this further operational refinement, we expect to drive considerable progress on unit profitability on Energy Warehouses."

**Recent Business Highlights** 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Completed installation of our fully automated manufacturing line in the fourth quarter, which is operational and has increased our annual production capacity to almost 800 MWh.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Named a finalist of the 2022 Platts Global Energy Awards by S&P Global Commodity Insights.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Named a finalist of the 2022 The Cleanie Awards, in the Pioneer in New Technology Category.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Entered into an agreement with Burbank Water and Power (BWP) in California to deliver BWP's first utility-scale battery storage project. This agreement contemplates the installation of a 75 kW / 500kWh ESS Energy Warehouse™ is to be installed and connected to a 265 kW solar array on the BWP EcoCampus, with the aim of improving the resilience and reliability of the grid.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Selected by Consumers Energy, Michigan's largest energy provider, to deploy ESS's Energy Warehouse platform as part of a solar and storage microgrid powering a gas compression. This project includes the first iron flow battery to be used for a gas compression plant and is expected to provide a sustainable, resilient energy storage solution for critical infrastructure when paired with solar photovoltaics.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Entered into a partnership with Amsterdam Airport Schiphol, the second largest airport in mainland Europe, to provide Energy Warehouses to enable the retirement of polluting diesel generators in the future and help advance Schiphol Airport's sustainability strategy. The purpose of this project is for the Energy Warehouse to recharge Electric Ground Power Units (E-GPU), which are intended to replace the diesel ground power units currently used to supply electrical power to aircraft when parked at the airport.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Announced an agreement to deliver two Energy Warehouse systems to Turlock Irrigation District (TID) in Central California. Supporting TID's Project Nexus, which aims to generate clean energy while conserving water resources in an increasingly arid California, the EWs are to be paired with the first-ever installation of solar panels over irrigation canals in the United States to shade canals with solar panels that are designed

------

to reduce evaporative losses while generating clean energy. Funding for the project will be provided by the State of California and administered by the Department of Water Resources.

**Conference Call Details** 

ESS will hold a conference call on Wednesday, March 1, 2023 at 5:00 p.m. EST to discuss financial results for its fourth quarter and full year ended December 31, 2022.

Interested parties may join the conference call beginning at 5:00 p.m. EST on Wednesday, March 1, 2023 via telephone by calling (833) 927-1758 in the U.S., or for international callers, by calling +1 (929) 526-1599 and entering conference ID 710604. A telephone replay will be available until March 8, 2023, by dialing (866) 813-9403 in the U.S., or for international callers, +44 (204) 525-0658 with conference ID 778697. A live webcast of the conference call will be available on ESS' Investor Relations website at http://investors.essinc.com/.

A replay of the call will be available via the web at http://investors.essinc.com/.

**About ESS, Inc.** 

At ESS (NYSE: GWH), our mission is to accelerate global decarbonization by providing safe, sustainable, long-duration energy storage that powers people, communities and businesses with clean, renewable energy anytime and anywhere it's needed. As more renewable energy is added to the grid, long-duration energy storage is essential to providing the reliability and resiliency we need when the sun is not shining, and the wind is not blowing.

Our technology uses earth-abundant iron, salt and water to deliver environmentally safe solutions capable of providing up to 12 hours of flexible energy capacity for commercial and utility-scale energy storage applications. Established in 2011, ESS Tech, Inc. enables project developers, independent power producers, utilities and other large energy users to deploy reliable, sustainable long-duration energy storage solutions. For more information visit www.essinc.com.

**Use of Non-GAAP Financial Measures**

In this press release and the accompanying earnings call, the Company includes Non-GAAP Operating Expenses and Adjusted EBITDA, which are non-GAAP performance measures that the Company uses to supplement its results presented in accordance with U.S. GAAP. As required by the rules of the Securities and Exchange Commission ("SEC"), the Company has provided herein a reconciliation of the non-GAAP financial measures contained in this press release and the accompanying earnings call to the most directly comparable measures under GAAP. The Company's management believes Non-GAAP Operating Expenses and Adjusted EBITDA are useful in evaluating its operating performance and are similar measures reported by publicly-listed U.S. companies, and regularly used by securities analysts, institutional investors, and other interested parties in analyzing operating performance and prospects. By providing these non-GAAP measures, the Company's management intends to provide investors with a meaningful, consistent comparison of the Company's profitability for the periods presented. Adjusted EBITDA is not intended to be a substitute for net income/loss or any U.S. GAAP financial measure and, as calculated, may not be comparable to other similarly titled measures of performance of other companies in other industries or within the same industry. Further, Non-GAAP Operating Expenses are not intended to be a substitute for GAAP Operating Expenses or any U.S. GAAP financial measure and, as calculated, may not be comparable to other similarly titled measures of performance of other companies in other industries or within the same industry.

The Company defines and calculates Non-GAAP Operating Expenses as GAAP Operating Expenses adjusted for stock-based compensation and other special items determined by management as they are not indicative of business operations. The Company defines and calculates Adjusted EBITDA as net loss before interest, other non-operating expense or income, (benefit) provision for income taxes, and depreciation, and further adjusted for stock-based compensation and other special items determined by management, including, but not limited to, fair value adjustments for certain financial liabilities associated with debt and equity transactions as they are not indicative of business operations.

**Forward-Looking Statements** 

This communication contains certain forward-looking statements, including statements regarding ESS and its management team's expectations, hopes, beliefs, intentions or strategies regarding the future. The words "anticipate", "believe", "continue", "could", "estimate", "expect", "intends", "may", "might", "plan", "possible",

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"potential", "predict", "project", "should", "will" "would" and similar expressions may identify forward-looking statements, but the absence of these words does not mean that a statement is not forward-looking. Examples of forward-looking statements include, among others, statements regarding the Company's manufacturing plans, the Company's order and sales pipeline, the Company's ability to execute on orders, the Company's ability to effectively manage costs and the Company's partnerships with third parties such as Amsterdam Airport Schiphol, BWP, CMS, ESIAP, the Sacramento Municipal Utility District and the Turlock Irrigation District. These forward-looking statements are based on ESS' current expectations and beliefs concerning future developments and their potential effects on ESS. Many factors could cause actual future events to differ materially from the forward-looking statements in this communication. There can be no assurance that the future developments affecting ESS will be those that we have anticipated. These forward-looking statements involve a number of risks, uncertainties (some of which are beyond ESS control) or other assumptions that may cause actual results or performance to be materially different from those expressed or implied by these forward-looking statements, which include, but are not limited to, continuing supply chain issues; delays, disruptions, or quality control problems in the Company's manufacturing operations; the Company's ability to hire, train and retain an adequate number of manufacturing employees; issues related to the shipment and installation of the Company's products; issues related to customer acceptance of the Company's products; issues related to the Company's partnerships with third parties; inflationary pressures; risk of loss of government funding for customer projects; and the Company's need to achieve significant business growth to achieve sustained, long-term profitability. Except as required by law, ESS is not undertaking any obligation to update or revise any forward-looking statements whether as a result of new information, future events or otherwise.

**Contacts** 

**Investors:** 

Erik Bylin

investors@essinc.com

**Media:** 

Morgan Pitts

+1 (503) 568-0755

Morgan.Pitts@essinc.com

**Source:** ESS Tech, Inc.

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**ESS Tech, Inc.**

**Statements of Operations and Comprehensive Loss** 

**Three Months Ended December 31, 2022 and 2021**

**(Unaudited, in thousands, except share and per share data)** 

---

| | | |
|:---|:---|:---|
| | **Three Months Ended December 31,** | **Three Months Ended December 31,** |
| | **2022** | **2021** |
| &nbsp;&nbsp;&nbsp;**Revenue:** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Revenue | $15 | $— |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Revenue - related parties | 1 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total revenue | 16 |  |
| &nbsp;&nbsp;&nbsp;**Operating expenses:** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Research and development | 22789 | 10558 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sales and marketing | 1721 | 1224 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;General and administrative | 6902 | 19640 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total operating expenses | 31412 | 31422 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Loss from operations | (31396) | (31422) |
| &nbsp;&nbsp;&nbsp;**Other income (expenses), net:** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Interest income (expense), net | 1188 | (193) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gain (loss) on revaluation of warrant liabilities | 5004 | (19831) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Loss on revaluation of derivative liabilities |  | 25526 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gain (loss) on revaluation of earnout liabilities | 269 | (154806) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Other (expenses) income, net | (140) |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total other income (expenses), net | 6321 | (149304) |
| &nbsp;&nbsp;&nbsp;**Net loss and comprehensive loss to common stockholders** | $(25075) | $(180726) |
| &nbsp;&nbsp;&nbsp;Net loss per share - basic and diluted | $(0.16) | $(1.33) |
| &nbsp;&nbsp;&nbsp;Weighted average shares used in per share calculation - basic and diluted | 153414471 | 135885630 |

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**ESS Tech, Inc.**

**Statements of Operations and Comprehensive Loss** 

**Years Ended December 31, 2022 and 2021**

**(Unaudited, in thousands, except share and per share data)** 

---

| | | |
|:---|:---|:---|
|  | **2022** | **2021** |
| &nbsp;&nbsp;&nbsp;**Revenue:** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Revenue | $610 | $— |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Revenue - related parties | 284 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total revenue | 894 |  |
| &nbsp;&nbsp;&nbsp;**Operating expenses:** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Research and development | 71979 | 30275 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sales and marketing | 6938 | 3041 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;General and administrative | 27469 | 27286 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total operating expenses | 106386 | 60602 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Loss from operations | (105492) | (60602) |
| &nbsp;&nbsp;&nbsp;**Other income (expenses), net:** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Interest income (expense), net | 2187 | (1886) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gain (loss) on revaluation of warrant liabilities | 24475 | (37584) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Loss on revaluation of derivative liabilities |  | (223165) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gain (loss) on revaluation of earnout liabilities | 1313 | (154806) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Other (expenses) income, net | (452) | 926 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total other income (expenses), net | 27523 | (416515) |
| &nbsp;&nbsp;&nbsp;**Net loss and comprehensive loss to common stockholders** | $(77969) | $(477117) |
| &nbsp;&nbsp;&nbsp;Net loss per share - basic and diluted | $(0.51) | $(5.73) |
| &nbsp;&nbsp;&nbsp;Weighted average shares used in per share calculation - basic and diluted | 152676155 | 83256431 |

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**ESS Tech, Inc.**

**Balance Sheets**

**As of December 31, 2022 and 2021**

**(Unaudited, in thousands, except share data)** 

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| | | |
|:---|:---|:---|
| | **2022** | **2021** |
| **ASSETS** |  |  |
| **Current assets:** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Cash and cash equivalents | $34767 | $238940 |
| &nbsp;&nbsp;&nbsp;&nbsp;Restricted cash, current | 1213 | 1217 |
| &nbsp;&nbsp;&nbsp;&nbsp;Accounts receivable, net | 4952 | 451 |
| &nbsp;&nbsp;&nbsp;&nbsp;Accounts receivable, net - related parties |  | 66 |
| &nbsp;&nbsp;&nbsp;&nbsp;Short-term investments | 105047 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Prepaid expenses and other current assets | 5657 | 4844 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total current assets** | 151636 | 245518 |
| &nbsp;&nbsp;&nbsp;&nbsp;Property and equipment, net | 17570 | 4501 |
| &nbsp;&nbsp;&nbsp;&nbsp;Operating lease right-of-use assets | 3401 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Restricted cash, non-current | 675 | 75 |
| &nbsp;&nbsp;&nbsp;&nbsp;Other non-current assets | 271 | 105 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total assets** | $173553 | $250199 |
| **LIABILITIES AND STOCKHOLDERS' EQUITY** |  |  |
| **Current liabilities:** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Accounts payable | $3036 | $1572 |
| &nbsp;&nbsp;&nbsp;&nbsp;Accrued and other current liabilities | 14125 | 6487 |
| &nbsp;&nbsp;&nbsp;&nbsp;Accrued product warranties | 1643 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Operating lease liabilities, current | 1421 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Deferred revenue | 6168 | 3663 |
| &nbsp;&nbsp;&nbsp;&nbsp;Notes payable, current | 1600 | 1900 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total current liabilities** | 27993 | 13622 |
| &nbsp;&nbsp;&nbsp;&nbsp;Notes payable, non-current | 315 | 1869 |
| &nbsp;&nbsp;&nbsp;&nbsp;Operating lease liabilities, non-current | 2535 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Deferred revenue, non-current | 2442 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Earnout warrant liabilities | 163 | 1476 |
| &nbsp;&nbsp;&nbsp;&nbsp;Public warrant liabilities | 2066 | 18666 |
| &nbsp;&nbsp;&nbsp;&nbsp;Private warrant liabilities | 980 | 8855 |
| &nbsp;&nbsp;&nbsp;&nbsp;Other non-current liabilities | 85 | 552 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total liabilities** | 36579 | 45040 |
| **Stockholders' equity:** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Preferred stock ($0.0001 par value, 200,000,000 shares authorized, none issued and outstanding as of December 31, 2022 and 2021) |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Common stock ($0.0001 par value; 2,000,000,000 shares authorized, 153,821,339 and 151,839,058 shares issued and outstanding as of December 31, 2022 and 2021, respectively) | 16 | 16 |
| &nbsp;&nbsp;&nbsp;&nbsp;Additional paid-in capital | 755537 | 745753 |
| &nbsp;&nbsp;&nbsp;&nbsp;Accumulated deficit | (618579) | (540610) |
| &nbsp;&nbsp;&nbsp;&nbsp;**Total stockholders' equity** | 136974 | 205159 |
| &nbsp;&nbsp;&nbsp;&nbsp;**Total liabilities and stockholders' equity** | $173553 | $250199 |

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**ESS Tech, Inc.**

**Reconciliation of GAAP to Non-GAAP Operating Expenses**

**(Unaudited, in thousands)**

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| | | |
|:---|:---|:---|
| | **Three Months Ended December 31,** | **Twelve Months Ended December 31,** |
| | **2022** | **2022** |
| Research and development | $22789 | $71979 |
| &nbsp;&nbsp;Less: stock-based compensation<sup>(1)</sup> | (915) | (2856) |
| Non-GAAP research and development | $21874 | $69123 |
| Sales and marketing | $1721 | $6938 |
| &nbsp;&nbsp;Less: stock-based compensation<sup>(1)</sup> | (150) | (456) |
| Non-GAAP sales and marketing | $1571 | $6482 |
| General and administrative | $6902 | $27469 |
| &nbsp;&nbsp;Less: stock-based compensation<sup>(1)</sup> | (2121) | (8577) |
| Non-GAAP general and administrative | $4781 | $18892 |
| Total operating expenses | $31412 | $106386 |
| &nbsp;&nbsp;Less: stock-based compensation | (3186) | (11889) |
| Non-GAAP total operating expenses | $28226 | $94497 |
| <sup>(1)</sup> For purposes of calculating Non-GAAP total operating expenses, stock-based compensation is allocated on a departmental basis based on the classification of the award holder. | <sup>(1)</sup> For purposes of calculating Non-GAAP total operating expenses, stock-based compensation is allocated on a departmental basis based on the classification of the award holder. | <sup>(1)</sup> For purposes of calculating Non-GAAP total operating expenses, stock-based compensation is allocated on a departmental basis based on the classification of the award holder. |

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**ESS Tech, Inc.**

**Reconciliation of GAAP Net Loss to Adjusted EBITDA**

**(Unaudited, in thousands)**

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| | | |
|:---|:---|:---|
| | **Three Months Ended December 31,** | **Twelve Months Ended December 31,** |
| | **2022** | **2022** |
| Net loss | $(25075) | $(77969) |
| &nbsp;&nbsp; Interest income, net | (1188) | (2187) |
| &nbsp;&nbsp;Stock-based compensation | 3186 | 11889 |
| &nbsp;&nbsp;Depreciation and amortization | 691 | 1506 |
| &nbsp;&nbsp;Gain on revaluation of warrant liabilities | (5004) | (24475) |
| &nbsp;&nbsp;Gain on revaluation of earnout liabilities | (269) | (1313) |
| &nbsp;&nbsp;Other expense, net | 140 | 452 |
| Adjusted EBITDA | $(27519) | $(92097) |

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