KWR

Quaker Chemical Corporation

A maker of industrial process fluids, Quaker Houghton supplies metal removal fluids, rolling lubricants, hydraulic fluids, and surface treatments used by steelmakers, aluminum producers, and aerospace and automotive manufacturers. The company was formed in 2019 when Quaker Chemical (founded in 1918) merged with Houghton International, whose roots stretch back to 1865 in Norristown, Pennsylvania. Its "Quaker" name nods to the state's Quaker heritage, made famous by William Penn's colony.

CUSIP: 747316107MaterialsUS1 holder

Ownership Activity Financials Filings

Schedule 13D / 13G filings

Gulf Hungary Holding Korlatolt Felelossegu Tarsasag

13D/AActivist

% of class21.1%

Shares3.64M

FiledAug 24, 2026

Introductory Note This Amendment No. 41 to Schedule 13D (this "Amendment No. 41") amends and supplements the statement on Schedule 13D filed on August 9, 2019, as amended by Amendment No. 1 filed on April 13, 2020, Amendment No. 2 filed on May 21, 2020, Amendment No. 3 filed on May 28, 2020, Amendment No. 4 filed on August 31, 2020, Amendment No. 5 filed on March 11, 2021, Amendment No. 6 filed on May 26, 2022, Amendment No. 7 filed on July 13, 2022, Amendment No. 8 filed on July 18, 2022, Amendment No. 9 filed on July 21, 2022, Amendment No. 10 filed on July 26, 2022, Amendment No. 11 filed on July 29, 2022, Amendment No. 12 filed on August 3, 2022, Amendment No. 13 filed on August 8, 2022, Amendment No. 14 filed on August 11, 2022, Amendment No. 15 filed on August 12, 2022, Amendment No. 16 filed on March 8, 2023, Amendment No. 17 filed on November 27, 2023, Amendment No. 18 filed on May 24, 2024, Amendment No. 19 filed on November 26, 2024, Amendment No. 20 filed on November 27, 2024, Amendment No. 21 filed on December 4, 2024, Amendment No. 22 filed on December 9, 2024, Amendment No. 23 filed on December 12, 2024, Amendment No. 24 filed on December 17, 2024, Amendment No. 25 filed on December 20, 2024, Amendment No. 26 filed on December 26, 2024, Amendment No. 27 filed on December 27, 2024, Amendment No. 28 filed on January 2, 2025, Amendment No. 29 filed on January 7, 2025, Amendment No. 30 filed on January 10, 2025, Amendment No. 31 filed on January 15, 2025, Amendment No. 32 filed on January 21, 2025, Amendment No. 33 filed on January 24, 2025, Amendment No. 34 filed on January 29, 2025, Amendment No. 35 filed on February 3, 2025, Amendment No. 36 filed on February 6, 2025, Amendment No. 37 filed on February 11, 2025, Amendment No. 38 filed on May 27, 2025, Amendment No. 39 filed on November 28, 2025 and Amendment No. 40 filed on May 28, 2026 (together, the "Original Schedule 13D") with the Securities and Exchange Commission (the "SEC"). This Amendment No. 41 is being filed in connection with the release from escrow on August 20, 2026 of 5,017 Shares beneficially owned by Gulf Hungary but held in the name of Citibank N.A., pursuant to the Escrow Agreement (as defined in the Original Schedule 13D) in order to secure the Reporting Persons' indemnification obligations related to the Issuer's acquisition of Global Houghton Ltd., to the Issuer in order to satisfy such indemnification obligations and 3,905 Shares were released from escrow to Gulf Hungary as such Shares were no longer needed to secure indemnification obligations. After consummation of the transactions described above, QH Hungary remained the direct beneficial owner, of a total of 3,635,112 Shares and Gulf Hungary remained the indirect beneficial owner of the same 3,635,112 Shares. Gulf Hungary continues to be the direct beneficial owner of a separate 3,905 Shares. All 3,635,112 Shares directly owned by QH Hungary remain subject to the Shareholder Agreement (as defined in the Original Schedule 13D) to which QH Hungary also became a party by executing a joinder thereto. This Amendment No. 41 is filed jointly by the Reporting Persons. All disclosure for items contained in the Original Schedule 13D is incorporated herein by reference, subject to being amended by the additional information provided for such item in this Amendment No. 41. Capitalized terms used and not defined herein shall have the meanings given to such terms in the Original Schedule 13D. Item 4 of the Original Schedule 13D is hereby amended to add the following: This Amendment No. 41 relates to the release from escrow on August 20, 2026 of 5,017 Shares beneficially owned by Gulf Hungary but held in the name of Citibank N.A., pursuant to the Escrow Agreement (as defined in the Original Schedule 13D) in order to secure the Reporting Persons' indemnification obligations related to the Issuer's acquisition of Global Houghton Ltd., to the Issuer in order to satisfy such indemnification obligations and 3,905 Shares were released from escrow to Gulf Hungary as such Shares were no longer needed to secure indemnification obligations. This transaction is described in further detail in Item 6 of this Amendment No. 41.

QH Hungary Holdings Limited

13D/AActivist

% of class21.1%

Shares3.64M

FiledAug 24, 2026

Vanguard Portfolio Management

13GPassive

% of class5.39%

Shares934.7K

FiledApr 29, 2026

The Vanguard Group

13G/APassive

% of class0%

Shares0

FiledMar 27, 2026

BlackRock, Inc.

13G/APassive

% of class11.5%

Shares2.03M

FiledApr 28, 2025

Holder	Schedule	% of class	Shares	Filed
Gulf Hungary Holding Korlatolt Felelossegu Tarsasag	13D/AActivist	21.1%	3.64M	Aug 24, 2026
Introductory Note This Amendment No. 41 to Schedule 13D (this "Amendment No. 41") amends and supplements the statement on Schedule 13D filed on August 9, 2019, as amended by Amendment No. 1 filed on April 13, 2020, Amendment No. 2 filed on May 21, 2020, Amendment No. 3 filed on May 28, 2020, Amendment No. 4 filed on August 31, 2020, Amendment No. 5 filed on March 11, 2021, Amendment No. 6 filed on May 26, 2022, Amendment No. 7 filed on July 13, 2022, Amendment No. 8 filed on July 18, 2022, Amendment No. 9 filed on July 21, 2022, Amendment No. 10 filed on July 26, 2022, Amendment No. 11 filed on July 29, 2022, Amendment No. 12 filed on August 3, 2022, Amendment No. 13 filed on August 8, 2022, Amendment No. 14 filed on August 11, 2022, Amendment No. 15 filed on August 12, 2022, Amendment No. 16 filed on March 8, 2023, Amendment No. 17 filed on November 27, 2023, Amendment No. 18 filed on May 24, 2024, Amendment No. 19 filed on November 26, 2024, Amendment No. 20 filed on November 27, 2024, Amendment No. 21 filed on December 4, 2024, Amendment No. 22 filed on December 9, 2024, Amendment No. 23 filed on December 12, 2024, Amendment No. 24 filed on December 17, 2024, Amendment No. 25 filed on December 20, 2024, Amendment No. 26 filed on December 26, 2024, Amendment No. 27 filed on December 27, 2024, Amendment No. 28 filed on January 2, 2025, Amendment No. 29 filed on January 7, 2025, Amendment No. 30 filed on January 10, 2025, Amendment No. 31 filed on January 15, 2025, Amendment No. 32 filed on January 21, 2025, Amendment No. 33 filed on January 24, 2025, Amendment No. 34 filed on January 29, 2025, Amendment No. 35 filed on February 3, 2025, Amendment No. 36 filed on February 6, 2025, Amendment No. 37 filed on February 11, 2025, Amendment No. 38 filed on May 27, 2025, Amendment No. 39 filed on November 28, 2025 and Amendment No. 40 filed on May 28, 2026 (together, the "Original Schedule 13D") with the Securities and Exchange Commission (the "SEC"). This Amendment No. 41 is being filed in connection with the release from escrow on August 20, 2026 of 5,017 Shares beneficially owned by Gulf Hungary but held in the name of Citibank N.A., pursuant to the Escrow Agreement (as defined in the Original Schedule 13D) in order to secure the Reporting Persons' indemnification obligations related to the Issuer's acquisition of Global Houghton Ltd., to the Issuer in order to satisfy such indemnification obligations and 3,905 Shares were released from escrow to Gulf Hungary as such Shares were no longer needed to secure indemnification obligations. After consummation of the transactions described above, QH Hungary remained the direct beneficial owner, of a total of 3,635,112 Shares and Gulf Hungary remained the indirect beneficial owner of the same 3,635,112 Shares. Gulf Hungary continues to be the direct beneficial owner of a separate 3,905 Shares. All 3,635,112 Shares directly owned by QH Hungary remain subject to the Shareholder Agreement (as defined in the Original Schedule 13D) to which QH Hungary also became a party by executing a joinder thereto. This Amendment No. 41 is filed jointly by the Reporting Persons. All disclosure for items contained in the Original Schedule 13D is incorporated herein by reference, subject to being amended by the additional information provided for such item in this Amendment No. 41. Capitalized terms used and not defined herein shall have the meanings given to such terms in the Original Schedule 13D. Item 4 of the Original Schedule 13D is hereby amended to add the following: This Amendment No. 41 relates to the release from escrow on August 20, 2026 of 5,017 Shares beneficially owned by Gulf Hungary but held in the name of Citibank N.A., pursuant to the Escrow Agreement (as defined in the Original Schedule 13D) in order to secure the Reporting Persons' indemnification obligations related to the Issuer's acquisition of Global Houghton Ltd., to the Issuer in order to satisfy such indemnification obligations and 3,905 Shares were released from escrow to Gulf Hungary as such Shares were no longer needed to secure indemnification obligations. This transaction is described in further detail in Item 6 of this Amendment No. 41.
QH Hungary Holdings Limited	13D/AActivist	21.1%	3.64M	Aug 24, 2026
Introductory Note This Amendment No. 41 to Schedule 13D (this "Amendment No. 41") amends and supplements the statement on Schedule 13D filed on August 9, 2019, as amended by Amendment No. 1 filed on April 13, 2020, Amendment No. 2 filed on May 21, 2020, Amendment No. 3 filed on May 28, 2020, Amendment No. 4 filed on August 31, 2020, Amendment No. 5 filed on March 11, 2021, Amendment No. 6 filed on May 26, 2022, Amendment No. 7 filed on July 13, 2022, Amendment No. 8 filed on July 18, 2022, Amendment No. 9 filed on July 21, 2022, Amendment No. 10 filed on July 26, 2022, Amendment No. 11 filed on July 29, 2022, Amendment No. 12 filed on August 3, 2022, Amendment No. 13 filed on August 8, 2022, Amendment No. 14 filed on August 11, 2022, Amendment No. 15 filed on August 12, 2022, Amendment No. 16 filed on March 8, 2023, Amendment No. 17 filed on November 27, 2023, Amendment No. 18 filed on May 24, 2024, Amendment No. 19 filed on November 26, 2024, Amendment No. 20 filed on November 27, 2024, Amendment No. 21 filed on December 4, 2024, Amendment No. 22 filed on December 9, 2024, Amendment No. 23 filed on December 12, 2024, Amendment No. 24 filed on December 17, 2024, Amendment No. 25 filed on December 20, 2024, Amendment No. 26 filed on December 26, 2024, Amendment No. 27 filed on December 27, 2024, Amendment No. 28 filed on January 2, 2025, Amendment No. 29 filed on January 7, 2025, Amendment No. 30 filed on January 10, 2025, Amendment No. 31 filed on January 15, 2025, Amendment No. 32 filed on January 21, 2025, Amendment No. 33 filed on January 24, 2025, Amendment No. 34 filed on January 29, 2025, Amendment No. 35 filed on February 3, 2025, Amendment No. 36 filed on February 6, 2025, Amendment No. 37 filed on February 11, 2025, Amendment No. 38 filed on May 27, 2025, Amendment No. 39 filed on November 28, 2025 and Amendment No. 40 filed on May 28, 2026 (together, the "Original Schedule 13D") with the Securities and Exchange Commission (the "SEC"). This Amendment No. 41 is being filed in connection with the release from escrow on August 20, 2026 of 5,017 Shares beneficially owned by Gulf Hungary but held in the name of Citibank N.A., pursuant to the Escrow Agreement (as defined in the Original Schedule 13D) in order to secure the Reporting Persons' indemnification obligations related to the Issuer's acquisition of Global Houghton Ltd., to the Issuer in order to satisfy such indemnification obligations and 3,905 Shares were released from escrow to Gulf Hungary as such Shares were no longer needed to secure indemnification obligations. After consummation of the transactions described above, QH Hungary remained the direct beneficial owner, of a total of 3,635,112 Shares and Gulf Hungary remained the indirect beneficial owner of the same 3,635,112 Shares. Gulf Hungary continues to be the direct beneficial owner of a separate 3,905 Shares. All 3,635,112 Shares directly owned by QH Hungary remain subject to the Shareholder Agreement (as defined in the Original Schedule 13D) to which QH Hungary also became a party by executing a joinder thereto. This Amendment No. 41 is filed jointly by the Reporting Persons. All disclosure for items contained in the Original Schedule 13D is incorporated herein by reference, subject to being amended by the additional information provided for such item in this Amendment No. 41. Capitalized terms used and not defined herein shall have the meanings given to such terms in the Original Schedule 13D. Item 4 of the Original Schedule 13D is hereby amended to add the following: This Amendment No. 41 relates to the release from escrow on August 20, 2026 of 5,017 Shares beneficially owned by Gulf Hungary but held in the name of Citibank N.A., pursuant to the Escrow Agreement (as defined in the Original Schedule 13D) in order to secure the Reporting Persons' indemnification obligations related to the Issuer's acquisition of Global Houghton Ltd., to the Issuer in order to satisfy such indemnification obligations and 3,905 Shares were released from escrow to Gulf Hungary as such Shares were no longer needed to secure indemnification obligations. This transaction is described in further detail in Item 6 of this Amendment No. 41.
Vanguard Portfolio Management	13GPassive	5.39%	934.7K	Apr 29, 2026
The Vanguard Group	13G/APassive	0%	0	Mar 27, 2026
BlackRock, Inc.	13G/APassive	11.5%	2.03M	Apr 28, 2025