HESM · Hess Midstream LP

The remaining 2025 phantom shares vest ratably on March 8, 2027 and March 8, 2028 and have no expiration date.

Class A shares acquired upon settlement of phantom shares granted under Hess Midstream's 2017 Long Term Incentive Plan.

Each phantom share is the economic equivalent of one Class A share.

The phantom shares will vest on March 8, 2027 and have no expiration date.

Each phantom share is the economic equivalent of one Class A share.

The phantom shares will vest on March 8, 2027 and have no expiration date.

Shares withheld to cover required tax obligations upon settlement of phantom shares.

The 2023 phantom shares vested on March 8, 2026.

Each phantom share is the economic equivalent of one Class A share.

The phantom shares will vest on March 8, 2027 and have no expiration date.

The 2025 phantom shares vested on March 8, 2026.

The remaining 2024 phantom shares will vest on March 8, 2027 and have no expiration date.

Shares withheld to cover required tax obligations upon settlement of phantom shares.

The 2025 phantom shares vested on March 8, 2026.

Class A shares acquired upon settlement of phantom shares granted in 2025 for service as director. Each phantom share is the economic equivalent of one Class A share.

Class A shares acquired upon settlement of phantom shares granted under Hess Midstream's 2017 Long Term Incentive Plan.

Class A shares acquired upon settlement of phantom shares granted under Hess Midstream's 2017 Long Term Incentive Plan.

Class A shares acquired upon settlement of phantom shares granted in 2025 for service as director. Each phantom share is the economic equivalent of one Class A share.

The 2025 phantom shares vested on March 8, 2026.

Class A shares acquired upon settlement of phantom shares granted in 2025 for service as director. Each phantom share is the economic equivalent of one Class A share.

Class A shares acquired upon settlement of phantom shares granted under Hess Midstream's 2017 Long Term Incentive Plan.

Shares withheld to cover required tax obligations upon settlement of phantom shares.

Shares withheld to cover required tax obligations upon settlement of phantom shares.

The remaining 2025 phantom shares vest ratably on March 8, 2027 and March 8, 2028 and have no expiration date.

The Opco Class B Units may be converted at any time into Class A Shares on a one-to-one basis and have no expiration date.

Represents securities held by HINDL. HINDL is a direct, wholly owned subsidiary of Hess Corporation ("Hess"), which is a direct, wholly owned subsidiary of Chevron Corporation ("Chevron"). As a result, Chevron and Hess may be deemed to beneficially own the securities held of record by HINDL. Chevron and Hess disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein.

Reflects the cancellation for no consideration of 455,811 Class B Shares in connection with Hess Midstream Operations LP's repurchase of 455,811 Opco Class B Units from Hess Investments North Dakota LLC ("HINDL") and the subsequent cancellation of such Opco Class B Units.

Represents securities held by HINDL. HINDL is a direct, wholly owned subsidiary of Hess Corporation ("Hess"), which is a direct, wholly owned subsidiary of Chevron Corporation ("Chevron"). As a result, Chevron and Hess may be deemed to beneficially own the securities held of record by HINDL. Chevron and Hess disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein.

The phantom shares vested on September 26, 2025 and have no expiration date.

Class A shares acquired upon settlement of phantom shares granted under Hess Midstream's 2017 Long Term Incentive Plan.

Class A shares acquired upon settlement of phantom shares granted under Hess Midstream's 2017 Long Term Incentive Plan.

The phantom shares vested on September 26, 2025 and have no expiration date.

Class A shares acquired upon settlement of phantom shares granted under Hess Midstream's 2017 Long Term Incentive Plan.

The phantom shares vested on September 26, 2025 and have no expiration date.

The reported sales transactions were executed at prices ranging from $41.525 to $41.650. The price reported above reflects the weighted average sales 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 transactions were affected.

Reflects the cancellation for no consideration of 695,894 Class B Shares in connection with Hess Midstream Operations LP's repurchase of 695,894 Opco Class B Units from Hess Investments North Dakota LLC ("HINDL") and the subsequent cancellation of such Opco Class B Units.

Reflects holdings following a transaction exempt from reporting pursuant to Rule 16a-13.

Represents securities held by HINDL. HINDL is an indirect, wholly owned subsidiary of Hess Corporation ("Hess"), which is a direct, wholly owned subsidiary of Chevron Corporation ("Chevron"). As a result, Chevron and Hess may be deemed to beneficially own the securities held of record by HINDL. Chevron and Hess disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein.

The Opco Class B Units may be converted at any time into Class A Shares on a one-to-one basis and have no expiration date.

Represents securities held by HINDL. HINDL is an indirect, wholly owned subsidiary of Hess Corporation ("Hess"), which is a direct, wholly owned subsidiary of Chevron Corporation ("Chevron"). As a result, Chevron and Hess may be deemed to beneficially own the securities held of record by HINDL. Chevron and Hess disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein.

Reflects the transfer of 449,000 Class A Shares from Hess Midstream GP LP to each of Hess Investments North Dakota LLC and GIP II Blue Holding, L.P for no consideration.

Represents securities held by Hess Midstream GP LP. Hess Infrastructure Partners GP LLC is the sole member of Hess Midstream GP LLC, which is the general partner of Hess Midstream GP LP. As such, each of the foregoing entities may be deemed to beneficially own the securities held of record by Hess Midstream GP LP.

Represents securities held by Blue Holding. Global Infrastructure Investors II, LLC is the sole general partner of Global Infrastructure GP II, L.P., which is the sole member of GIP Blue Holding GP, LLC, which is the general partner of Blue Holding. As such, each of the foregoing entities may be deemed to beneficially own the securities held of record by Blue Holding. Each such entity and BlackRock Portfolio Management LLC disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

Reflects (i) the cancellation for no consideration of 14,573,517 Class B Shares in connection with the conversion of the Opco Class B Units into Class A Shares and (ii) the transfer of 14,573,517 Class B Shares from Hess Midstream GP LP to Hess Investments North Dakota LLC for no consideration.

Represents securities held by Hess Midstream GP LP. Hess Infrastructure Partners GP LLC is the sole member of Hess Midstream GP LLC, which is the general partner of Hess Midstream GP LP. As such, each of the foregoing entities may be deemed to beneficially own the securities held of record by Hess Midstream GP LP.

Includes a transfer of 449,000 Class A Shares from Hess Midstream GP LP to Blue Holding in a transaction exempt from reporting pursuant to Rule 16a-13.

Represents securities held by Blue Holding. Global Infrastructure Investors II, LLC is the sole general partner of Global Infrastructure GP II, L.P., which is the sole member of GIP Blue Holding GP, LLC, which is the general partner of Blue Holding. As such, each of the foregoing entities may be deemed to beneficially own the securities held of record by Blue Holding. Each such entity and BlackRock Portfolio Management LLC disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

Reflects the cancellation for no consideration of Class B Shares in connection with the conversion of the Opco Class B Units into Class A Shares.

Represents securities held by Hess Midstream GP LP. Hess Infrastructure Partners GP LLC is the sole member of Hess Midstream GP LLC, which is the general partner of Hess Midstream GP LP. Hess Infrastructure Partners GP LLC is a 50/50 joint venture between Hess Investments North Dakota LLC ("HINDL") and GIP II Blue Holding, L.P. ("Blue Holding"). As such, each of the foregoing entities may be deemed to beneficially own the securities held of record by Hess Midstream GP LP. Each such entity and BlackRock Portfolio Management LLC disclaims beneficial ownership of such securities except to the extent of their pecuniary interest therein.

Includes a transfer of 449,000 Class A Shares from Hess Midstream GP LP to Blue Holding in a transaction exempt from reporting pursuant to Rule 16a-13.

Represents securities held by Blue Holding. Global Infrastructure Investors II, LLC is the sole general partner of Global Infrastructure GP II, L.P., which is the sole member of GIP Blue Holding GP, LLC, which is the general partner of Blue Holding. As such, each of the foregoing entities may be deemed to beneficially own the securities held of record by Blue Holding. Each such entity and BlackRock Portfolio Management LLC disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

Reflects (i) the cancellation for no consideration of 5,151,842 Class B Shares in connection with Hess Midstream Operations LP's repurchase of an aggregate of 5,151,842 Opco Class B Units from Hess Investments North Dakota LLC ("HINDL") and GIP II Blue Holding, L.P. and the subsequent cancellation of such Opco Class B Units and (ii) the transfer of 1,073,930 Class B Shares from Hess Midstream GP LP to HINDL for no consideration.

Represents securities held by Hess Midstream GP LP. Hess Infrastructure Partners GP LLC is the sole member of Hess Midstream GP LLC, which is the general partner of Hess Midstream GP LP. As such, each of the foregoing entities may be deemed to beneficially own the securities held of record by Hess Midstream GP LP.

Reflects (i) the cancellation for no consideration of 2,038,956 Class B Shares in connection with Hess Midstream Operations LP's repurchase of 2,038,956 Opco Class B Units from Hess Investments North Dakota LLC ("HINDL") and the subsequent cancellation of such Opco Class B Units, and (ii) the transfer of 1,073,930 Class B Shares from Hess Midstream GP LP to HINDL for no consideration.

Reflects holdings following a transaction exempt from reporting purusuant to Rule 16a-13.

Represents securities held by Hess Midstream GP LP. Hess Infrastructure Partners GP LLC is the sole member of Hess Midstream GP LLC, which is the general partner of Hess Midstream GP LP. Hess Infrastructure Partners GP LLC is a 50/50 joint venture between HINDL and Blue Holding. As such, each of the foregoing entities may be deemed to beneficially own the securities held of record by Hess Midstream GP LP. Each such entity disclaims beneficial ownership of such securities except to the extent of their pecuniary interest therein.

Reflects the cancellation for no consideration of Class B Shares in connection with Hess Midstream Operations LP's repurchase of 3,112,886 Opco Class B Units from GIP II Blue Holding, L.P. ("Blue Holding") and a subsequent cancellation of such Opco Class B Units.

Represents securities held by Hess Midstream GP LP. Hess Infrastructure Partners GP LLC is the sole member of Hess Midstream GP LLC, which is the general partner of Hess Midstream GP LP. Hess Infrastructure Partners GP LLC is a 50/50 joint venture between HINDL and Blue Holding. As such, each of the foregoing entities may be deemed to beneficially own the securities held of record by Hess Midstream GP LP. Each such entity and BlackRock Portfolio Management LLC disclaims beneficial ownership of such securities except to the extent of their pecuniary interest therein.

The Opco Class B Units may be converted at any time into Class A Shares on a one-to-one basis and have no expiration date.

Represents securities held by Blue Holding. Global Infrastructure Investors II, LLC is the sole general partner of Global Infrastructure GP II, L.P., which is the sole member of GIP Blue Holding GP, LLC, which is the general partner of Blue Holding. As such, each of the foregoing entities may be deemed to beneficially own the securities held of record by Blue Holding. Each such entity and BlackRock Portfolio Management LLC disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

The Opco Class B Units may be converted at any time into Class A Shares on a one-to-one basis and have no expiration date.

Represents securities held by HINDL. HINDL is an indirect, wholly owned subsidiary of Hess Corporation, a publicly traded company listed on the New York Stock Exchange. As a result, Hess Corporation may be deemed to beneficially own the securities held of record by HINDL and Hess Midstream GP LP. Hess Corporation disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

Shares sold solely to satisfy tax withholding upon settlement of phantom shares.

The remaining 2024 phantom shares vest ratably on March 8, 2026 and March 8, 2027 and have no expiration date.

The 2024 phantom shares vested on March 8, 2025 and have no expiration date.

The remaining 2022 phantom shares vest on March 8, 2026 and have no expiration date.

Each phantom share is the economic equivalent of one Class A Share.

The phantom shares will vest in three equal installments beginning March 8, 2026 and have no expiration date.

Class A shares acquired upon settlement of phantom shares granted under Hess Midstream's 2017 Long Term Incentive Plan.