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Represents number of shares of Jacobs common stock tendered for tax withholding upon vesting of restricted stock units pursuant to the Company's Stock Incentive Plan.

Represents receipt of restricted stock units pursuant to the Company's Stock Incentive Plan. Each restricted stock unit represents the right to receive one share of Jacobs common stock. The restricted stock units vest in two equal annual installments beginning on the first anniversary of grant date.

Represents number of shares of Jacobs common stock tendered for tax withholding upon vesting of restricted stock units pursuant to the Company's Stock Incentive Plan.

Represents the receipt of restricted stock units pursuant to the Company's Stock Incentive Plan. Each restricted stock unit represents the right to receive one share of Jacobs common stock. The restricted stock units vest in four equal annual installments beginning on the first anniversary of grant date.

This transaction was executed in multiple trades at prices ranging from $111.01 to $111.09. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

Represents the receipt of restricted stock units pursuant to the Company's Outside Director Stock Plan. Each restricted stock unit represents the right to receive one share of Jacobs common stock at the time of vesting. The restricted stock units will become 100% vested on the first to occur of the following (i) the one-year anniversary of the award date or (ii) the date of the Company's 2027 annual shareholder meeting occurring after December 31, 2026, provided that Director remains a director of the Company continuously through such vesting date.

Represents the receipt of restricted stock units pursuant to the Company's Outside Director Stock Plan. Each restricted stock unit represents the right to receive one share of Jacobs common stock at the time of vesting. The restricted stock units will become 100% vested on the first to occur of the following (i) the one-year anniversary of the award date or (ii) the date of the Company's 2027 annual shareholder meeting occurring after December 31, 2026, provided that Director remains a director of the Company continuously through such vesting date.

Represents the receipt of restricted stock units pursuant to the Company's Outside Director Stock Plan. Each restricted stock unit represents the right to receive one share of Jacobs common stock at the time of vesting. The restricted stock units will become 100% vested on the first to occur of the following (i) the one-year anniversary of the award date or (ii) the date of the Company's 2027 annual shareholder meeting occurring after December 31, 2026, provided that Director remains a director of the Company continuously through such vesting date.

Represents the receipt of restricted stock units pursuant to the Company's Outside Director Stock Plan. Each restricted stock unit represents the right to receive one share of Jacobs common stock at the time of vesting. The restricted stock units will become 100% vested on the first to occur of the following (i) the one-year anniversary of the award date or (ii) the date of the Company's 2027 annual shareholder meeting occurring after December 31, 2026, provided that Director remains a director of the Company continuously through such vesting date.

Represents the receipt of restricted stock units pursuant to the Company's Outside Director Stock Plan. Each restricted stock unit represents the right to receive one share of Jacobs common stock at the time of vesting. The restricted stock units will become 100% vested on the first to occur of the following (i) the one-year anniversary of the award date or (ii) the date of the Company's 2027 annual shareholder meeting occurring after December 31, 2026, provided that Director remains a director of the Company continuously through such vesting date.

Represents the receipt of restricted stock units pursuant to the Company's Outside Director Stock Plan. Each restricted stock unit represents the right to receive one share of Jacobs common stock at the time of vesting. The restricted stock units will become 100% vested on the first to occur of the following (i) the one-year anniversary of the award date or (ii) the date of the Company's 2027 annual shareholder meeting occurring after December 31, 2026, provided that Director remains a director of the Company continuously through such vesting date.

Represents the receipt of restricted stock units pursuant to the Company's Outside Director Stock Plan. Each restricted stock unit represents the right to receive one share of Jacobs common stock at the time of vesting. The restricted stock units will become 100% vested on the first to occur of the following (i) the one-year anniversary of the award date or (ii) the date of the Company's 2027 annual shareholder meeting occurring after December 31, 2026, provided that Director remains a director of the Company continuously through such vesting date.

Represents the receipt of restricted stock units pursuant to the Company's Outside Director Stock Plan. Each restricted stock unit represents the right to receive one share of Jacobs common stock at the time of vesting. The restricted stock units will become 100% vested on the first to occur of the following (i) the one-year anniversary of the award date or (ii) the date of the Company's 2027 annual shareholder meeting occurring after December 31, 2026, provided that Director remains a director of the Company continuously through such vesting date.

Represents the receipt of restricted stock units pursuant to the Company's Outside Director Stock Plan. Each restricted stock unit represents the right to receive one share of Jacobs common stock at the time of vesting. The restricted stock units will become 100% vested on the first to occur of the following (i) the one-year anniversary of the award date or (ii) the date of the Company's 2027 annual shareholder meeting occurring after December 31, 2026, provided that Director remains a director of the Company continuously through such vesting date.

Represents receipt of restricted stock units pursuant to the Company's Stock Incentive Plan. Each restricted stock unit represents the right to receive one share of Jacobs common stock. The restricted stock units vest on the first anniversary of grant date.

Represents number of shares of Jacobs common stock tendered for tax withholding upon vesting of restricted stock units pursuant to the Company's Stock Incentive Plan.

Represents receipt of restricted stock units pursuant to the Company's Stock Incentive Plan. Each restricted stock unit represents the right to receive one share of Jacobs common stock. The restricted stock units vest on the first anniversary of grant date.

Represents receipt of restricted stock units pursuant to the Company's Stock Incentive Plan. Each restricted stock unit represents the right to receive one share of Jacobs common stock. The restricted stock units vest in full on the first anniversary of grant date.

Represents number of shares of Jacobs common stock tendered for tax withholding upon vesting of restricted stock units pursuant to the Company's Stock Incentive Plan.

Represents receipt of restricted stock units pursuant to the Company's Stock Incentive Plan. Each restricted stock unit represents the right to receive one share of Jacobs common stock. The restricted stock units vest on the first anniversary of grant date.

Represents receipt of restricted stock units pursuant to the Company's Stock Incentive Plan. Each restricted stock unit represents the right to receive one share of Jacobs common stock. The restricted stock units vest on the first anniversary of grant date.

Represents number of shares of Jacobs common stock tendered for tax withholding upon vesting of restricted stock units pursuant to the Company's Stock Incentive Plan.

Represents number of shares of Jacobs common stock tendered for tax withholding upon vesting of restricted stock units pursuant to the Company's Stock Incentive Plan.

Represents receipt of restricted stock units pursuant to the Company's Stock Incentive Plan. Each restricted stock unit represents the right to receive one share of Jacobs common stock. The restricted stock units vest on the first anniversary of grant date.

Shares held in family trust.

Represents the receipt of restricted stock units pursuant to the Company's Stock Incentive Plan. Each restricted stock unit represents the right to receive one share of Jacobs common stock. The restricted stock unit vests in four equal annual installments beginning on the first anniversary of grant date.

Represents distribution of Jacobs common stock upon vesting of performance stock units awarded on November 16, 2022 pursuant to the Company's Stock Incentive Plan.

The number of performance stock units that vested, and therefore the number of shares of Jacobs common stock issued upon vesting, represents 156.9% of the number of performance stock units initially awarded, with such percentage based on the Company's average return on invested capital (ROIC) over the three-year performance period.

Each performance stock unit represented a contingent right to receive one share of Jacobs common stock.

Represents distribution of Jacobs common stock upon vesting of performance stock units awarded on November 16, 2022 pursuant to the Company's Stock Incentive Plan.

The number of performance stock units that vested, and therefore the number of shares of Jacobs common stock issued upon vesting, represents 84.6% of the number of performance stock units initially awarded, with such percentage based on the Company's average adjusted earnings per share (EPS) over the three-year performance period.

The performance stock units vested on November 17, 2025

Represents number of shares of Jacobs common stock tendered for tax withholding upon vesting of restricted stock units pursuant to the Company's Stock Incentive Plan.

Represents distribution of Jacobs common stock upon vesting of performance stock units awarded on November 16, 2022 pursuant to the Company's Stock Incentive Plan.

The number of performance stock units that vested, and therefore the number of shares of Jacobs common stock issued upon vesting, represents 156.9% of the number of performance stock units initially awarded, with such percentage based on the Company's average return on invested capital (ROIC) over the three-year performance period.

Each performance stock unit represented a contingent right to receive one share of Jacobs common stock.

Represents distribution of Jacobs common stock upon vesting of performance stock units awarded on November 16, 2022 pursuant to the Company's Stock Incentive Plan.

The number of performance stock units that vested, and therefore the number of shares of Jacobs common stock issued upon vesting, represents 84.6% of the number of performance stock units initially awarded, with such percentage based on the Company's average adjusted earnings per share (EPS) over the three-year performance period.

The performance stock units vested on November 17, 2025.

Each performance stock unit represented a contingent right to receive one share of Jacobs common stock.

Represents distribution of Jacobs common stock upon vesting of performance stock units awarded on November 16, 2022 pursuant to the Company's Stock Incentive Plan.

The number of performance stock units that vested, and therefore the number of shares of Jacobs common stock issued upon vesting, represents 84.6% of the number of performance stock units initially awarded, with such percentage based on the Company's average adjusted earnings per share (EPS) over the three-year performance period.

The performance stock units vested on November 17, 2025.

Represents number of shares of Jacobs common stock tendered for tax withholding upon vesting of performance stock units.

Each performance stock unit represented a contingent right to receive one share of Jacobs common stock.

Represents distribution of Jacobs common stock upon vesting of performance stock units awarded on November 16, 2022 pursuant to the Company's Stock Incentive Plan.

The number of performance stock units that vested, and therefore the number of shares of Jacobs common stock issued upon vesting, represents 156.9% of the number of performance stock units initially awarded, with such percentage based on the Company's average return on invested capital (ROIC) over the three-year performance period.

The performance stock units vested on November 17, 2025.

Represents distribution of Jacobs common stock upon vesting of performance stock units awarded on November 16, 2022 pursuant to the Company's Stock Incentive Plan.

The number of performance stock units that vested, and therefore the number of shares of Jacobs common stock issued upon vesting, represents 84.6% of the number of performance stock units initially awarded, with such percentage based on the Company's average adjusted earnings per share (EPS) over the three-year performance period.

Each performance stock unit represented a contingent right to receive one share of Jacobs common stock.

Represents distribution of Jacobs common stock upon vesting of performance stock units awarded on November 16, 2022 pursuant to the Company's Stock Incentive Plan.

The number of performance stock units that vested, and therefore the number of shares of Jacobs common stock issued upon vesting, represents 156.9% of the number of performance stock units initially awarded, with such percentage based on the Company's average return on invested capital (ROIC) over the three-year performance period.

The performance stock units vested on November 17, 2025.

Represents the receipt of restricted stock units pursuant to the Company's Stock Incentive Plan. Each restricted stock unit represents the right to receive one share of Jacobs common stock. The restricted stock unit vests in four equal annual installments beginning on the first anniversary of grant date.

Represents number of shares of Jacobs common stock tendered for tax withholding upon vesting of performance stock units.

Represents the receipt of restricted stock units pursuant to the Company's Stock Incentive Plan. Each restricted stock unit represents the right to receive one share of Jacobs common stock. The restricted stock unit vests in four equal annual installments beginning on the first anniversary of grant date.

Represents number of shares of Jacobs common stock tendered for tax withholding upon vesting of performance stock units.

Represents number of shares of Jacobs common stock tendered for tax withholding upon vesting of performance stock units.

Represents the receipt of restricted stock units pursuant to the Company's Stock Incentive Plan. Each restricted stock unit represents the right to receive one share of Jacobs common stock. The restricted stock unit vests in four equal annual installments beginning on the first anniversary of grant date.

Represents number of shares of Jacobs common stock tendered for tax withholding upon vesting of performance stock units.