ALLE · Allegion plc

Includes shares acquired through a dividend reinvestment plan since the Reporting Person's last Form 4 filing.

Represents the Reporting Person's transfer of 1,527 shares of the Issuer's ordinary stock to The Eckersley Family Trust, Timothy Paul Eckersley & Suzanne K. Eckersley, Trustees (the "Trust") for no consideration. The Reporting Person and his spouse are the sole beneficiaries of the Trust, and the Reporting Person remains the beneficial owner of the securities held by the Trust.

Represents the Reporting Person's transfer of 1,527 shares of the Issuer's ordinary stock to The Eckersley Family Trust, Timothy Paul Eckersley & Suzanne K. Eckersley, Trustees (the "Trust") for no consideration. The Reporting Person and his spouse are the sole beneficiaries of the Trust, and the Reporting Person remains the beneficial owner of the securities held by the Trust.

Represents ordinary shares held by The Eckersley Family Trust, Timothy Paul Eckersley & Suzanne K. Eckersley, Trustees.

A stock option that vested in equal annual installments on February 13, 2018, February 13, 2019, and February 13, 2020, and is exercisable.

Represents shares withheld by the Issuer to cover tax withholding obligations upon vesting of a restricted stock unit award.

Due to a rounding error in reporting shares previously acquired through a dividend reinvestment plan, the Amount of Securities Beneficially Owned was inadvertently overreported by 1 share. The Reporting Person's ownership has been adjusted to reflect the correct Amount of Securities Beneficially Owned of 29,919.

The option exercises reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 11, 2026.

A stock option that vested in equal annual installments on February 13, 2018, February 13, 2019, and February 13, 2020, and is exercisable.

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 12, 2025.

The option exercises reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 12, 2025.

The option exercises reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 11, 2026.

The option exercises reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 12, 2025.

A stock option that vested in equal annual installments on February 13, 2018, February 13, 2019, and February 13, 2020, and is exercisable.

The option exercises reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 12, 2025.

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 11, 2026.

The option exercises reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 12, 2025.

A stock option that vested in equal annual installments on February 22, 2019, February 22, 2020, and February 22, 2021, and is exercisable.

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 12, 2025.

Represents shares withheld by the Issuer to cover tax withholding obligations upon vesting of a restricted stock unit award.

Represents shares withheld by the Issuer to cover tax withholding obligations upon vesting of a restricted stock unit award.

Represents shares withheld by the Issuer to cover tax withholding obligations upon vesting of a restricted stock unit award.

Represents shares withheld by the Issuer to cover tax withholding obligations upon vesting of a restricted stock unit award.

Represents shares withheld by the Issuer to cover tax withholding obligations upon vesting of a restricted stock unit award.

Represents shares withheld by the Issuer to cover tax withholding obligations upon vesting of a restricted stock unit award.

Represents shares withheld by the Issuer to cover tax withholding obligations upon vesting of a restricted stock unit award.

Represents shares withheld by the Issuer to cover tax withholding obligations upon vesting of a restricted stock unit award.

Restricted stock units that vest on June 4, 2027.

Includes shares acquired through a dividend reinvestment plan since the reporting person's last Form 4 filing.

Restricted stock units that vest on June 4, 2027.

Includes shares acquired through a dividend reinvestment plan since the reporting person's last Form 4 filing.

Restricted stock units that vest on June 4, 2027.

Restricted stock units that vest on June 4, 2027.

Restricted stock units that vest on June 4, 2027.

Restricted stock units that vest on June 4, 2027.

Restricted stock units that vest on June 4, 2027.

This transaction was executed in multiple purchases ranging from $148.895 to $149.74 per share, inclusive. The price reported above reflects the weighted average purchase price. The reporting person hereby undertakes to provide upon request to the SEC staff, the Issuer, or any security holder of the Issuer full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

Represents ordinary shares held by the Main-Schweitzer Revocable Trust.

This transaction was executed in multiple purchases ranging from $150.04 to $150.12 per share, inclusive. The price reported above reflects the weighted average purchase price. The reporting person hereby undertakes to provide upon request to the SEC staff, the Issuer, or any security holder of the Issuer full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

Represents ordinary shares held by the Main-Schweitzer Revocable Trust.

Represents ordinary shares held by the Main-Schweitzer Revocable Trust.

Represents shares withheld by the Issuer to cover tax withholding obligations upon vesting of a restricted stock unit award.

Represents shares withheld by the Issuer to cover tax withholding obligations upon vesting of a restricted stock unit award.

On February 26, 2026, the reporting person filed a Form 4 which incorrectly reported 240 shares withheld by the Issuer to cover tax withholding obligations upon vesting of a restricted stock unit award. The correct number of shares withheld by the Issuer to cover tax withholding obligations upon vesting of a restricted stock unit award was 157.

Represents shares withheld by the Issuer to cover tax withholding obligations upon vesting of a restricted stock unit award.

Represents shares withheld by the Issuer to cover tax withholding obligations upon vesting of a restricted stock unit award.

Represents shares withheld by the Issuer to cover tax withholding obligations upon vesting of a restricted stock unit award.

Represents shares withheld by the Issuer to cover tax withholding obligations upon vesting of a restricted stock unit award.

Represents shares withheld by the Issuer to cover tax withholding obligations upon vesting of a restricted stock unit award.

Represents shares withheld by the Issuer to cover tax withholding obligations upon vesting of a restricted stock unit award.

Represents shares withheld by the Issuer to cover tax withholding obligations upon vesting of a restricted stock unit award.

Represents shares withheld by the Issuer to cover tax withholding obligations upon vesting of a restricted stock unit award.

Represents shares withheld by the Issuer to cover tax withholding obligations upon vesting of a restricted stock unit award.

Represents shares withheld by the Issuer to cover tax withholding obligations upon vesting of a restricted stock unit award.