WTS · Watts Water Technologies Inc

This sale of Class A Common Stock was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 10, 2025.

This sale of Class A Common Stock was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 10, 2025.

This sale of Class A Common Stock was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 10, 2025.

Represents the number of shares required to be withheld to cover tax withholding obligations in connection with the vesting of restricted stock units (RSUs) purchased by the Reporting Person under the Issuer's Management Stock Purchase Plan (MSPP) on March 15, 2023. The Reporting Person previously reported the total number of shares subject to vesting of the RSUs in Table I of a Form 4 filed in connection with the original purchase of the RSUs. The withholding of shares to cover tax withholding obligations is mandated by the terms of the Issuer's MSPP and does not represent a discretionary transaction by the Reporting Person.

Represents the number of shares required to be withheld to cover tax withholding obligations in connection with the vesting of restricted stock units (RSUs) purchased by the Reporting Person under the Issuer's Management Stock Purchase Plan (MSPP) on March 15, 2023. The Reporting Person previously reported the total number of shares subject to vesting of the RSUs in Table I of a Form 4 filed in connection with the original purchase of the RSUs. The withholding of shares to cover tax withholding obligations is mandated by the terms of the Issuer's MSPP and does not represent a discretionary transaction by the Reporting Person.

Represents shares disposed to cover taxes upon the vesting of a deferred stock award granted to the Reporting Person on March 14, 2024. The disposition of shares to cover tax withholding obligations is required by the terms of the Reporting Person's grant agreement and does not represent a discretionary transaction by the Reporting Person.

Represents shares disposed to cover taxes upon the vesting of a deferred stock award granted to the Reporting Person on March 14, 2024. The disposition of shares to cover tax withholding obligations is required by the terms of the Reporting Person's grant agreement and does not represent a discretionary transaction by the Reporting Person.

Represents shares disposed to cover taxes upon the vesting of a deferred stock award granted to the Reporting Person on March 14, 2025. The disposition of shares to cover tax withholding obligations is required by the terms of the Reporting Person's grant agreement and does not represent a discretionary transaction by the Reporting Person.

Represents shares disposed to cover taxes upon the vesting of a deferred stock award granted to the Reporting Person on March 14, 2025. The disposition of shares to cover tax withholding obligations is required by the terms of the Reporting Person's grant agreement and does not represent a discretionary transaction by the Reporting Person.

Represents shares disposed to cover taxes upon the vesting of a deferred stock award granted to the Reporting Person on March 14, 2025. The disposition of shares to cover tax withholding obligations is required by the terms of the Reporting Person's grant agreement and does not represent a discretionary transaction by the Reporting Person.

Represents the number of shares required to be withheld to cover tax withholding obligations in connection with the vesting of restricted stock units (RSUs) purchased by the Reporting Person under the Issuer's Management Stock Purchase Plan (MSPP) on March 15, 2023. The Reporting Person previously reported the total number of shares subject to vesting of the RSUs in Table I of a Form 4 filed in connection with the original purchase of the RSUs. The withholding of shares to cover tax withholding obligations is mandated by the terms of the Issuer's MSPP and does not represent a discretionary transaction by the Reporting Person.

Represents shares disposed to cover taxes upon the vesting of a deferred stock award granted to the Reporting Person on March 14, 2025. The disposition of shares to cover tax withholding obligations is required by the terms of the Reporting Person's grant agreement and does not represent a discretionary transaction by the Reporting Person.

Represents shares disposed to cover taxes upon the vesting of a deferred stock award granted to the Reporting Person on March 14, 2024. The disposition of shares to cover tax withholding obligations is required by the terms of the Reporting Person's grant agreement and does not represent a discretionary transaction by the Reporting Person.

Represents shares disposed to cover taxes upon the vesting of a deferred stock award granted to the Reporting Person on March 14, 2024. The disposition of shares to cover tax withholding obligations is required by the terms of the Reporting Person's grant agreement and does not represent a discretionary transaction by the Reporting Person.

Represents shares disposed to cover taxes upon the vesting of a deferred stock award granted to the Reporting Person on March 14, 2025. The disposition of shares to cover tax withholding obligations is required by the terms of the Reporting Person's grant agreement and does not represent a discretionary transaction by the Reporting Person.

Represents shares disposed to cover taxes upon the vesting of a deferred stock award granted to the Reporting Person on March 14, 2024. The disposition of shares to cover tax withholding obligations is required by the terms of the Reporting Person's grant agreement and does not represent a discretionary transaction by the Reporting Person.

Represents shares disposed to cover taxes upon the vesting of a deferred stock award granted to the Reporting Person on March 14, 2024. The disposition of shares to cover tax withholding obligations is required by the terms of the Reporting Person's grant agreement and does not represent a discretionary transaction by the Reporting Person.

Represents the number of shares required to be withheld to cover tax withholding obligations in connection with the vesting of restricted stock units (RSUs) purchased by the Reporting Person under the Issuer's Management Stock Purchase Plan (MSPP) on March 15, 2023. The Reporting Person previously reported the total number of shares subject to vesting of the RSUs in Table I of a Form 4 filed in connection with the original purchase of the RSUs. The withholding of shares to cover tax withholding obligations is mandated by the terms of the Issuer's MSPP and does not represent a discretionary transaction by the Reporting Person.

Represents shares disposed to cover taxes upon the vesting of a deferred stock award granted to the Reporting Person on March 14, 2025. The disposition of shares to cover tax withholding obligations is required by the terms of the Reporting Person's grant agreement and does not represent a discretionary transaction by the Reporting Person.

Represents shares disposed to cover taxes upon the vesting of a deferred stock award granted to the Reporting Person on March 14, 2024. The disposition of shares to cover tax withholding obligations is required by the terms of the Reporting Person's grant agreement and does not represent a discretionary transaction by the Reporting Person.

Represents the number of shares required to be withheld to cover tax withholding obligations in connection with the vesting of restricted stock units (RSUs) purchased by the Reporting Person under the Issuer's Management Stock Purchase Plan (MSPP) on March 15, 2023. The Reporting Person previously reported the total number of shares subject to vesting of the RSUs in Table I of a Form 4 filed in connection with the original purchase of the RSUs. The withholding of shares to cover tax withholding obligations is mandated by the terms of the Issuer's MSPP and does not represent a discretionary transaction by the Reporting Person.

Represents shares disposed to cover taxes upon the vesting of a deferred stock award granted to the Reporting Person on March 14, 2025. The disposition of shares to cover tax withholding obligations is required by the terms of the Reporting Person's grant agreement and does not represent a discretionary transaction by the Reporting Person.

Represents shares disposed to cover taxes upon the vesting of a deferred stock award granted to the Reporting Person on March 13, 2023. The disposition of shares to cover tax withholding obligations is required by the terms of the Reporting Person's grant agreement and does not represent a discretionary transaction by the Reporting Person.

Represents shares subject to restricted stock units purchased by the Reporting Person under the Issuer's Management Stock Purchase Plan at a discount of 20% from the closing sale price of the Issuer's Class A Common Stock on March 13, 2026. The restricted stock units were purchased using a portion of the Reporting Person's pre-tax 2025 performance bonus. The restricted stock units vest in three equal annual installments beginning one year after the date of grant.

Represents shares subject to restricted stock units purchased by the Reporting Person under the Issuer's Management Stock Purchase Plan at a discount of 20% from the closing sale price of the Issuer's Class A Common Stock on March 13, 2026. The restricted stock units were purchased using a portion of the Reporting Person's pre-tax 2025 performance bonus. The restricted stock units vest in three equal annual installments beginning one year after the date of grant.

Represents shares subject to restricted stock units purchased by the Reporting Person under the Issuer's Management Stock Purchase Plan at a discount of 20% from the closing sale price of the Issuer's Class A Common Stock on March 13, 2026. The restricted stock units were purchased using a portion of the Reporting Person's pre-tax 2025 performance bonus. The restricted stock units vest in three equal annual installments beginning one year after the date of grant.

Consists of shares of deferred stock that vest in three equal annual installments beginning on the first anniversary of the date of grant.

Consists of shares of deferred stock that vest in three equal annual installments beginning on the first anniversary of the date of grant.

This amendment to Form 4 corrects a mistake in the number of shares previously reported on the Reporting Person's Form 4 filed on March 17, 2026. The Reporting Person acquired 642 shares pursuant to the Management Stock Purchase Plan. The original Form 4 filing incorrectly reported the number of shares acquired as 481.

Represents shares subject to restricted stock units purchased by the Reporting Person under the Issuer's Management Stock Purchase Plan at a discount of 20% from the closing sale price of the Issuer's Class A Common Stock on March 13, 2026. The restricted stock units were purchased using a portion of the Reporting Person's pre-tax 2025 performance bonus. The restricted stock units vest in three equal annual installments beginning one year after the date of grant.

Consists of shares of deferred stock that vest in three equal annual installments beginning on the first anniversary of the date of grant.

Represents shares disposed to cover taxes upon the vesting of a deferred stock award granted to the Reporting Person on March 13, 2023. The disposition of shares to cover tax withholding obligations is required by the terms of the Reporting Person's grant agreement and does not represent a discretionary transaction by the Reporting Person.

Represents shares disposed to cover taxes upon the vesting of a deferred stock award granted to the Reporting Person on March 13, 2023. The disposition of shares to cover tax withholding obligations is required by the terms of the Reporting Person's grant agreement and does not represent a discretionary transaction by the Reporting Person.

Consists of shares of deferred stock that vest in three equal annual installments beginning on the first anniversary of the date of grant.

Represents shares disposed to cover taxes upon the vesting of a deferred stock award granted to the Reporting Person on March 13, 2023. The disposition of shares to cover tax withholding obligations is required by the terms of the Reporting Person's grant agreement and does not represent a discretionary transaction by the Reporting Person.

Represents shares disposed to cover taxes upon the vesting of a deferred stock award granted to the Reporting Person on March 13, 2023. The disposition of shares to cover tax withholding obligations is required by the terms of the Reporting Person's grant agreement and does not represent a discretionary transaction by the Reporting Person.

Consists of shares of deferred stock that vest in three equal annual installments beginning on the first anniversary of the date of grant.

Consists of shares of deferred stock that vest in three equal annual installments beginning on the first anniversary of the date of grant.

Represents shares disposed to cover taxes upon the vesting of a deferred stock award granted to the Reporting Person on March 13, 2023. The disposition of shares to cover tax withholding obligations is required by the terms of the Reporting Person's grant agreement and does not represent a discretionary transaction by the Reporting Person.

The shares are held in a trust for the benefit of the Reporting Person's children. The Reporting Person's spouse serves as co-trustee of this trust.

The shares were gifted by the Reporting Person to an irrevocable trust for the benefit of the Reporting Person's children.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $330.00 to $330.90, 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 within the range set forth in footnote (1) to this Form 4.

The shares are held in a revocable trust of which the Reporting Person is the sole trustee and the sole beneficiary.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $329.20 to $329.97, 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 within the range set forth in footnotes (1) through (5) to this Form 4.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $326.21 to $327.20, inclusive.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $325.14 to $326.12, inclusive.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $328.20 to $329.18, inclusive.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $327.20 to $328.18, inclusive.