NIGGLI MICHAEL R

SEC source: 0001377160-25-000005 · wk-form4_1760561460.xml · nonDerivative · entry 1

NIGGLI MICHAEL R · CIK 0001377160 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 90,825

F1 · shares: The reported shares are represented by restricted stock units ("RSUs") which vest on the earlier of (i) May 17, 2025 or (ii) the day prior to the next annual meeting of stockholders. The Reporting Person has elected to defer the settlement of these RSUs to a date within 30 days of the earlier of (i) his or her separation of service from the Issuer within the meaning of Section 409A of the Internal Revenue Code (Section 409A) or (ii) the date on which a change of control (as defined in the Issuer's plan) occurs, provided that such transaction qualifies as a change of control within the meaning of Section 409A.

SEC source: 0001628280-24-039163 · wk-form4_1725397356.xml · derivative · entry 11

NIGGLI MICHAEL R · CIK 0001377160 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 11,852 shares

Expires 2028-10-18

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F11 · derivative.exercise_date: The shares subject to the option vest in 48 equal monthly installments beginning on August 20, 2018.

SEC source: 0001628280-24-039163 · wk-form4_1725397356.xml · nonDerivative · entry 1

NIGGLI MICHAEL R · CIK 0001377160 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 77,312

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: On August 23, 2024 the issuer completed a one-for-fifteen reverse stock split of its common stock. All of the share numbers have been adjusted to reflect this reverse stock split.

SEC source: 0001628280-24-023947 · wk-form4_1715964252.xml · nonDerivative · entry 1

NIGGLI MICHAEL R · CIK 0001377160 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 951,896

F1 · shares: The reported shares are represented by restricted stock units ("RSUs") which vest on the earlier of (i) May 17, 2025 or (ii) the day prior to the next annual meeting of stockholders. The Reporting Person has elected to defer the settlement of these RSUs to a date within 30 days of the earlier of (i) his separation of service from the Issuer within the meaning of Section 409A of the Internal Revenue Code (Section 409A) or (ii) the date on which a change of control (as defined in the Issuer's plan) occurs, provided that such transaction qualifies as a change of control within the meaning of Section 409A.

F2 · balance_after: A portion of these securities are RSUs. Each RSU represents a contingent right to receive one share of the Issuer's Common Stock.

SEC source: 0001004980-24-000066 · wk-form4_1716322342.xml · nonDerivative · entry 1

NIGGLI MICHAEL R · CIK 0001377160 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 58,845.73

F1 · shares: Restricted Stock Units (RSUs) granted under the PG&E Corporation 2021 Long Term Incentive Plan (LTIP). RSUs are payable in shares of PG&E Corporation common stock on a one-for-one basis. As described in the LTIP, RSUs vest upon the earliest of one year from the date of grant; the last day of a director's elected term; a director's death, disability, or termination following a change in control; or a change in control in which the acquiror does not assume, continue, or substitute the award.

F2 · balance_after: This total reflects the acquisition of 13.07 RSUs on 1/15/24 and 6.66 RSUs on 4/15/24 pursuant to a dividend reinvestment feature of the LTIP.

SEC source: 0001628280-23-019259 · wk-form4_1684786962.xml · nonDerivative · entry 1

NIGGLI MICHAEL R · CIK 0001377160 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 749,194

F1 · shares: The reported shares are represented by restricted stock units, or RSUs, which vest on the earlier of (i) May 19, 2024 or (ii) the day prior to the Issuer's next annual meeting of stockholders.

SEC source: 0001004980-23-000102 · wk-form4_1684860510.xml · nonDerivative · entry 1

NIGGLI MICHAEL R · CIK 0001377160 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 49,149

F1 · shares: Restricted Stock Units (RSUs) granted under the PG&E Corporation 2021 Long Term Incentive Plan (LTIP). RSUs are payable in shares of PG&E Corporation common stock on a one-for-one basis. As described in the LTIP, RSUs vest upon the earliest of one year from the date of grant; the last day of a director's elected term; a director's death, disability, or termination following a change in control; or a change in control in which the acquiror does not assume, continue, or substitute the award.

SEC source: 0001628280-23-018718 · wk-form4_1684355179.xml · nonDerivative · entry 1

NIGGLI MICHAEL R · CIK 0001377160 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 613,821

SEC source: 0001628280-23-018310 · wk-form4_1684199137.xml · nonDerivative · entry 1

NIGGLI MICHAEL R · CIK 0001377160 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 603,821

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $1.125 to $1.13, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

SEC source: 0001628280-23-006779 · wf-form4_167822750070648.xml · nonDerivative · entry 1

NIGGLI MICHAEL R · CIK 0001377160 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 583,821

SEC source: 0001628280-22-032080 · wf-form4_167122014917015.xml · nonDerivative · entry 1

NIGGLI MICHAEL R · CIK 0001377160 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 578,821

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $2.545 to $2.58, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price.

SEC source: 0001628280-22-016181 · wf-form4_165428788351444.xml · nonDerivative · entry 1

NIGGLI MICHAEL R · CIK 0001377160 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 559,721

F1 · shares: The reported shares are represented by restricted stock units, or RSUs, which vest on on the earlier of (i) June 1, 2023 or (ii) the day prior to the date of the Issuer's next annual meeting of stockholders.

SEC source: 0001004980-22-000080 · wf-form4_165334914939313.xml · nonDerivative · entry 1

NIGGLI MICHAEL R · CIK 0001377160 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 38,313

F1 · shares: Restricted Stock Units (RSUs) granted under the PG&E Corporation 2021 Long Term Incentive Plan (LTIP). RSUs are payable in shares of PG&E Corporation common stock on a one-for-one basis. As described in the LTIP, RSUs vest upon the earliest of one year from the date of grant; the last day of a director's elected term; a director's death, disability, or termination following a change in control; or a change in control in which the acquiror does not assume, continue, or substitute the award.

SEC source: 0000899243-22-009227 · doc4.xml · nonDerivative · entry 1

NIGGLI MICHAEL R · CIK 0001377160 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 530,235

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $4.93 to $5.07, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price.

F2 · balance_after: Reflects an increase of 16 shares pursuant to an adjustment of earnout shares reported on a Form 4 filed on November 12, 2021.

SEC source: 0000899243-21-045197 · doc4.xml · nonDerivative · entry 2

NIGGLI MICHAEL R · CIK 0001377160 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 510,219

F4 · shares: The shares are represented by restricted stock units, or RSUs, awarded upon the satisfaction of certain performance metrics as determined by the Compensation Committee. The RSUs were fully vested on the award date.

SEC source: 0000899243-21-044447 · doc4.xml · nonDerivative · entry 6

NIGGLI MICHAEL R · CIK 0001377160 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 85,225

F1 · kind: Pursuant to an "earnout" provision of the Agreement and Plan of Merger, dated as of May 6, 2021 (the "Merger Agreement"), by and among ACON S2 Acquisition Corp, SCharge Merger Sub, Inc., and ESS Tech, Inc. (the "Issuer"), the reporting person is entitled to receive additional shares of Issuer common stock, for no additional consideration, if the volume weighted average price of Issuer common stock over twenty trading days within any thirty trading day period exceeds certain thresholds (the "Earnout Rights"). Of these Earnout Rights, one half will be issued if the volume weighted average price of the Issuer common stock over twenty trading days within any thirty trading day period is greater than or equal to $12.50, and one half will be issued if the volume weighted average price of the Issuer common stock over twenty trading days within any thirty trading day period is greater than or equal to $15.00. Each of these conditions was met as of November 9, 2021.

F2 · kind: Following the closing of the merger, the Issuer determined that aggregate Transaction Expenses (as defined in the Merger Agreement) were lower than had been estimated at the time of closing. Pursuant to the Merger Agreement, this lower amount of Transaction Expenses resulted in an Expense Shortfall (as defined therein), which increased the Adjusted Equity Value (as defined therein).

F6 · shares: Effective as of November 9, 2021, the reporting person was entitled to receive 11,577 shares of Issuer common stock pursuant to the Earnout Rights and 93 shares of Issuer common stock pursuant to the Expense Shortfall.

F10 · ownership.nature: The shares are held of record by the Michael R. Niggli Jr. 2021 Gift Trust for which the reporting person serves as trustee.

SEC source: 0000899243-21-044447 · doc4.xml · nonDerivative · entry 5

NIGGLI MICHAEL R · CIK 0001377160 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 85,225

F1 · kind: Pursuant to an "earnout" provision of the Agreement and Plan of Merger, dated as of May 6, 2021 (the "Merger Agreement"), by and among ACON S2 Acquisition Corp, SCharge Merger Sub, Inc., and ESS Tech, Inc. (the "Issuer"), the reporting person is entitled to receive additional shares of Issuer common stock, for no additional consideration, if the volume weighted average price of Issuer common stock over twenty trading days within any thirty trading day period exceeds certain thresholds (the "Earnout Rights"). Of these Earnout Rights, one half will be issued if the volume weighted average price of the Issuer common stock over twenty trading days within any thirty trading day period is greater than or equal to $12.50, and one half will be issued if the volume weighted average price of the Issuer common stock over twenty trading days within any thirty trading day period is greater than or equal to $15.00. Each of these conditions was met as of November 9, 2021.

F2 · kind: Following the closing of the merger, the Issuer determined that aggregate Transaction Expenses (as defined in the Merger Agreement) were lower than had been estimated at the time of closing. Pursuant to the Merger Agreement, this lower amount of Transaction Expenses resulted in an Expense Shortfall (as defined therein), which increased the Adjusted Equity Value (as defined therein).

F6 · shares: Effective as of November 9, 2021, the reporting person was entitled to receive 11,577 shares of Issuer common stock pursuant to the Earnout Rights and 93 shares of Issuer common stock pursuant to the Expense Shortfall.

F9 · ownership.nature: The shares are held of record by the Lorelei A. Niggli 2021 Gift Trust for which the reporting person serves as trustee.

SEC source: 0000899243-21-044447 · doc4.xml · nonDerivative · entry 4

NIGGLI MICHAEL R · CIK 0001377160 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 85,225

F1 · kind: Pursuant to an "earnout" provision of the Agreement and Plan of Merger, dated as of May 6, 2021 (the "Merger Agreement"), by and among ACON S2 Acquisition Corp, SCharge Merger Sub, Inc., and ESS Tech, Inc. (the "Issuer"), the reporting person is entitled to receive additional shares of Issuer common stock, for no additional consideration, if the volume weighted average price of Issuer common stock over twenty trading days within any thirty trading day period exceeds certain thresholds (the "Earnout Rights"). Of these Earnout Rights, one half will be issued if the volume weighted average price of the Issuer common stock over twenty trading days within any thirty trading day period is greater than or equal to $12.50, and one half will be issued if the volume weighted average price of the Issuer common stock over twenty trading days within any thirty trading day period is greater than or equal to $15.00. Each of these conditions was met as of November 9, 2021.

F2 · kind: Following the closing of the merger, the Issuer determined that aggregate Transaction Expenses (as defined in the Merger Agreement) were lower than had been estimated at the time of closing. Pursuant to the Merger Agreement, this lower amount of Transaction Expenses resulted in an Expense Shortfall (as defined therein), which increased the Adjusted Equity Value (as defined therein).

F6 · shares: Effective as of November 9, 2021, the reporting person was entitled to receive 11,577 shares of Issuer common stock pursuant to the Earnout Rights and 93 shares of Issuer common stock pursuant to the Expense Shortfall.

F8 · ownership.nature: The shares are held of record by the Ian M. Niggli 2021 Gift Trust for which the reporting person serves as trustee.

SEC source: 0000899243-21-044447 · doc4.xml · nonDerivative · entry 3

NIGGLI MICHAEL R · CIK 0001377160 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 85,225

F1 · kind: Pursuant to an "earnout" provision of the Agreement and Plan of Merger, dated as of May 6, 2021 (the "Merger Agreement"), by and among ACON S2 Acquisition Corp, SCharge Merger Sub, Inc., and ESS Tech, Inc. (the "Issuer"), the reporting person is entitled to receive additional shares of Issuer common stock, for no additional consideration, if the volume weighted average price of Issuer common stock over twenty trading days within any thirty trading day period exceeds certain thresholds (the "Earnout Rights"). Of these Earnout Rights, one half will be issued if the volume weighted average price of the Issuer common stock over twenty trading days within any thirty trading day period is greater than or equal to $12.50, and one half will be issued if the volume weighted average price of the Issuer common stock over twenty trading days within any thirty trading day period is greater than or equal to $15.00. Each of these conditions was met as of November 9, 2021.

F2 · kind: Following the closing of the merger, the Issuer determined that aggregate Transaction Expenses (as defined in the Merger Agreement) were lower than had been estimated at the time of closing. Pursuant to the Merger Agreement, this lower amount of Transaction Expenses resulted in an Expense Shortfall (as defined therein), which increased the Adjusted Equity Value (as defined therein).

F6 · shares: Effective as of November 9, 2021, the reporting person was entitled to receive 11,577 shares of Issuer common stock pursuant to the Earnout Rights and 93 shares of Issuer common stock pursuant to the Expense Shortfall.

F7 · ownership.nature: The shares are held of record by the Chloe D. Niggli Gift Trust for which the reporting person serves as trustee.

SEC source: 0000899243-21-044447 · doc4.xml · nonDerivative · entry 2

NIGGLI MICHAEL R · CIK 0001377160 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 227,400

F1 · kind: Pursuant to an "earnout" provision of the Agreement and Plan of Merger, dated as of May 6, 2021 (the "Merger Agreement"), by and among ACON S2 Acquisition Corp, SCharge Merger Sub, Inc., and ESS Tech, Inc. (the "Issuer"), the reporting person is entitled to receive additional shares of Issuer common stock, for no additional consideration, if the volume weighted average price of Issuer common stock over twenty trading days within any thirty trading day period exceeds certain thresholds (the "Earnout Rights"). Of these Earnout Rights, one half will be issued if the volume weighted average price of the Issuer common stock over twenty trading days within any thirty trading day period is greater than or equal to $12.50, and one half will be issued if the volume weighted average price of the Issuer common stock over twenty trading days within any thirty trading day period is greater than or equal to $15.00. Each of these conditions was met as of November 9, 2021.

F2 · kind: Following the closing of the merger, the Issuer determined that aggregate Transaction Expenses (as defined in the Merger Agreement) were lower than had been estimated at the time of closing. Pursuant to the Merger Agreement, this lower amount of Transaction Expenses resulted in an Expense Shortfall (as defined therein), which increased the Adjusted Equity Value (as defined therein).

F4 · shares: Effective as of November 9, 2021, the reporting person was entitled to receive 30,891 shares of Issuer common stock pursuant to the Earnout Rights and 249 shares of Issuer common stock pursuant to the Expense Shortfall.

F5 · ownership.nature: The shares are held of record by the Michael R. Niggli Family Trust for which the reporting person serves as trustee.

SEC source: 0000899243-21-044447 · doc4.xml · nonDerivative · entry 1

NIGGLI MICHAEL R · CIK 0001377160 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 480,166

F1 · kind: Pursuant to an "earnout" provision of the Agreement and Plan of Merger, dated as of May 6, 2021 (the "Merger Agreement"), by and among ACON S2 Acquisition Corp, SCharge Merger Sub, Inc., and ESS Tech, Inc. (the "Issuer"), the reporting person is entitled to receive additional shares of Issuer common stock, for no additional consideration, if the volume weighted average price of Issuer common stock over twenty trading days within any thirty trading day period exceeds certain thresholds (the "Earnout Rights"). Of these Earnout Rights, one half will be issued if the volume weighted average price of the Issuer common stock over twenty trading days within any thirty trading day period is greater than or equal to $12.50, and one half will be issued if the volume weighted average price of the Issuer common stock over twenty trading days within any thirty trading day period is greater than or equal to $15.00. Each of these conditions was met as of November 9, 2021.

F2 · kind: Following the closing of the merger, the Issuer determined that aggregate Transaction Expenses (as defined in the Merger Agreement) were lower than had been estimated at the time of closing. Pursuant to the Merger Agreement, this lower amount of Transaction Expenses resulted in an Expense Shortfall (as defined therein), which increased the Adjusted Equity Value (as defined therein).

F3 · shares: Effective as of November 9, 2021, the reporting person was entitled to receive 65,228 shares of Issuer common stock pursuant to the Earnout Rights and 524 shares of Issuer common stock pursuant to the Expense Shortfall.

SEC source: 0000899243-21-045197 · doc4.xml · nonDerivative · entry 1

NIGGLI MICHAEL R · CIK 0001377160 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 568,302

F1 · kind: Pursuant to an "earnout" provision of the Agreement and Plan of Merger, dated as of May 6, 2021 (the "Merger Agreement"), by and among ACON S2 Acquisition Corp, SCharge Merger Sub, Inc., and ESS Tech, Inc. (the "Issuer"), the reporting person is entitled to receive additional shares of Issuer common stock, for no additional consideration, if the volume weighted average price of Issuer common stock over twenty trading days within any thirty trading day period exceeds certain thresholds (the "Earnout Rights"). Of these Earnout Rights, one half will be issued if the volume weighted average price of the Issuer common stock over twenty trading days within any thirty trading day period is greater than or equal to $12.50, and one half will be issued if the volume weighted average price of the Issuer common stock over twenty trading days within any thirty trading day period is greater than or equal to $15.00. Each of these conditions was met as of November 9, 2021.

F2 · kind: Following the closing of the merger, the Issuer determined that aggregate Transaction Expenses (as defined in the Merger Agreement) were lower than had been estimated at the time of closing. Pursuant to the Merger Agreement, this lower amount of Transaction Expenses resulted in an Expense Shortfall (as defined therein), which increased the Adjusted Equity Value (as defined therein). Effective as of November 9, 2021, the reporting person was entitled to receive 77,201 shares of Issuer common stock pursuant to the Earnout Rights and 621 shares of Issuer common stock pursuant to the Expense Shortfall.

F3 · ownership.nature: The shares are held of record by the Linda Naviaux Niggli Trust for which the reporting person's spouse serves as trustee.

SEC source: 0001127602-21-017949 · form4.xml · nonDerivative · entry 1

NIGGLI MICHAEL R · CIK 0001377160 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 26,781

F1 · shares: Restricted Stock Units (RSUs) granted under the PG&E Corporation 2014 Long Term Incentive Plan (LTIP). RSUs are payable in shares of PG&E Corporation common stock on a one-for-one basis. As described in the LTIP, RSUs vest upon the earliest of one year from the date of grant, the last day of a director's elected term, or a director's death, disability, or termination following a change in control.

SEC source: 0001127602-20-022970 · form4.xml · nonDerivative · entry 1

NIGGLI MICHAEL R · CIK 0001377160 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,320

F1 · shares: Restricted Stock Units (RSUs) granted under the PG&E Corporation 2014 Long-Term Incentive Plan. RSUs are payable in shares of PG&E Corporation stock on a one-for-one basis.