WLKP · Westlake Chemical Partners LP

Each Phantom Unit is the economic equivalent of one Common Unit of the Issuer.

Each Phantom Unit is the economic equivalent of one Common Unit of the Issuer.

Each Phantom Unit is the economic equivalent of one Common Unit of the Issuer.

Each Phantom Unit is the economic equivalent of one Common Unit of the Issuer.

Each Phantom Unit is the economic equivalent of one Common Unit of the Issuer.

Each Phantom Unit is the economic equivalent of one Common Unit of the Issuer.

Each Phantom Unit is the economic equivalent of one Common Unit of the Issuer.

Each Phantom Unit is the economic equivalent of one Common Unit of the Issuer.

Each Phantom Unit is the economic equivalent of one Common Unit of the Issuer.

Weighted average price. These shares were sold in multiple transactions at prices ranging from $22.03 to $22.27 inclusive. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.

Weighted average price. These shares were sold in multiple transactions at prices ranging from $22.03 to $22.27 inclusive. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.

Weighted average price. These shares were sold in multiple transactions at prices ranging from $22.05 to $22.25 inclusive. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.

Weighted average price. These shares were sold in multiple transactions at prices ranging from $22.03 to $22.27 inclusive. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.

The original Form 4 filed by the Reporting Person on August 28, 2024 is amended by this Form 4/A to disclose that an additional 320 common units were purchased by the Reporting Person on August 28, 2024 and inadvertently omitted from the original Form 4. Unless indicated, this Form 4/A is in addition to, and does not replace, the disclosure contained in the original Form 4.

Weighted average price. These units were purchased in multiple transactions at prices ranging from $22.60 to $22.63 inclusive. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the SEC, upon request, full information regarding the number of units purchase at each separate price within the range set forth above.

Each Phantom Unit is the economic equivalent of one Common Unit of the Issuer.

Each Phantom Unit is the economic equivalent of one Common Unit of the Issuer.

Each Phantom Unit is the economic equivalent of one Common Unit of the Issuer.

Each Phantom Unit is the economic equivalent of one Common Unit of the Issuer.

Each Phantom Unit is the economic equivalent of one Common Unit of the Issuer.

Weighted average price. These units were purchased in multiple transactions at prices ranging from $22.89 to $23.00 inclusive. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the SEC, upon request, full information regarding the number of units purchase at each separate price within the range set forth above.

Each Phantom Unit is the economic equivalent of one Common Unit of the Issuer.

Each Phantom Unit is the economic equivalent of one Common Unit of the Issuer.

Each Phantom Unit is the economic equivalent of one Common Unit of the Issuer.

Each Phantom Unit is the economic equivalent of one Common Unit of the Issuer.

Each Phantom Unit is the economic equivalent of one Common Unit of the Issuer.

Each Phantom Unit is the economic equivalent of one Common Unit of the Issuer.

Weighted average price. These units were purchased in multiple transactions at prices ranging from $21.95 to $22.21 inclusive. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the SEC, upon request, full information regarding the number of units purchase at each separate price within the range set forth above.

Weighted average price. These units were purchased in multiple transactions at prices ranging from $22.20 to $22.32 inclusive. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the SEC, upon request, full information regarding the number of units purchase at each separate price within the range set forth above.

Weighted average price. These units were purchased in multiple transactions at prices ranging from $22.15 to $22.19 inclusive. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the SEC, upon request, full information regarding the number of units purchase at each separate price within the range set forth above.

Weighted average price. These units were purchased in multiple transactions at prices ranging from $22.05 to $22.13 inclusive. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the SEC, upon request, full information regarding the number of units purchase at each separate price within the range set forth above.