Jeddah, Saudi Arabia (44 Manufacturing Plants) (1) Facility is not included in manufacturing plants total as it is also included as part of another segment. (2) There are two manufacturing plants located at Suzhou, China. (3) Facility is not included in manufacturing plants total as it is a design center/lab. (4) There are two manufacturing plants located at Shanghai, China ITEM 3. Richardson, Executive Vice President and Chief Financial Officer** 101 .INS XBRL Instance Document** 101 .SCH XBRL Taxonomy Extension Schema Document** 101 .CAL XBRL Taxonomy Extension Calculation Linkbase Document** 101 .LAB XBRL Taxonomy Extension Label Linkbase Document** 101 .PRE XBRL Taxonomy Extension Presentation Linkbase Document** 101 .DEF XBRL Taxonomy Definition Linkbase Document** + Indicates management contract or compensatory plan, contract or arrangement in which one or more directors or executive officers of the Registrant may be participants † The exhibits and schedules have been omitted pursuant to Item 601(b)(2) of Regulation S-K and will be provided to the Securities and Exchange Commission upon request. ** Filed herewith. 67POLYONE CORPORATION SIGNATURES Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

2) Facility is not included in manufacturing plants total as it is a design center/lab

Minimum potential financial impact figure is calculated using 43.42 * 106,360 MT CO2e (2023 market-based Scope 1 & 2 emissions from manufacturing facilities, labs, warehouses and offices in countries where carbon pricing has been implemented) 4,618,151 rounded as 4,620,000 Maximum potential financial impact figure is calculated using 94.81* 106,360 MT CO2e (2023 market-based Scope 1 & 2 emissions) 10,083,991, rounded as 10,100,000 Due to the uncertainty in predicting carbon costs with changing markets and 27 regulations, we understand that our cost of carbon estimates may need adjustments. The new lab and plant will conduct cutting edge chemistry testing and evaluations to help customers tackle and overcome the challenge of plastics recycling and the goal of a circular economy. To effectively remind individuals to switch off PCs and lights when not in use, it is recommended to install reminder signs throughout the lab.

The new lab and plant will conduct cutting edge chemistry testing and evaluations to help customers tackle and overcome the challenge of plastics recycling and the goal of a circular economy.

b) Facility is not included in manufacturing plants total as it is a design center/lab. Beggs, Senior Vice President and Chief Financial Officer 101 .INS** Inline XBRL Instance Document 101 .SCH** Inline XBRL Taxonomy Extension Schema Document 101 .CAL** Inline XBRL Taxonomy Extension Calculation Linkbase Document 101 .LAB** Inline XBRL Taxonomy Extension Label Linkbase Document 101 .PRE** Inline XBRL Taxonomy Extension Presentation Linkbase Document 101 .DEF** Inline XBRL Taxonomy Definition Linkbase Document 104 Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101) + Indicates management contract or compensatory plan, contract or arrangement in which one or more directors or executive officers of the Registrant may be participants † Certain exhibits and schedules have been omitted pursuant to Item 601(a)(5) of Regulation S-K and will be provided to the Securities and Exchange Commission upon request. ** Filed herewith.

b) Facility is not included in manufacturing plants total as it is a design center/lab. Beggs, Senior Vice President and Chief Financial Officer 101 .INS** Inline XBRL Instance Document 101 .SCH** Inline XBRL Taxonomy Extension Schema Document 101 .CAL** Inline XBRL Taxonomy Extension Calculation Linkbase Document 101 .LAB** Inline XBRL Taxonomy Extension Label Linkbase Document 101 .PRE** Inline XBRL Taxonomy Extension Presentation Linkbase Document 101 .DEF** Inline XBRL Taxonomy Definition Linkbase Document 104 Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101) + Indicates management contract or compensatory plan, contract or arrangement in which one or more directors or executive officers of the Registrant may be participants † Certain exhibits and schedules have been omitted pursuant to Item 601(a)(5) of Regulation S-K and will be provided to the Securities and Exchange Commission upon request. ** Filed herewith.

Headquartered in Avon Lake, Ohio, Avient currently employs approximately 8,700 people at manufacturing sites, distribution facilities and technical labs located in North America, South America, Europe, Middle East, Asia and Africa. Konstantynow, Poland Pamplona, Spain (4) (1) There are two manufacturing plants located in Phoenix, Arizona. (2) There are two manufacturing plants located in Shanghai, China. (3) Facility is not included in manufacturing plants total as it is a design center/lab. (4) Facility is not included in manufacturing plants total as it is also included as part of another segment.

Portage, 14.Donora, Plants) 18.Pune, India Wisconsin (4) (6) Pennsylvania (4) 19.Pamplona, Spain 16.Ripon, Wisconsin (4) Cape Girardeau, 20.Bangkok, Thailand 17.Salisbury, Missouri (1) (4) 21.Pudong (Shanghai), Maryland (4) 15.Ramos Arizpe, China 18.Sheboygan Falls, Mexico (4) 22.Jeddah, Wisconsin (4) (15 Manufacturing Saudi Arabia (5) 19.Stamford, Plants) Shenzhen, China (1) Connecticut (4) 23.Tianjin, China 20.Warsaw, Indiana (4) 24.Novo Hamburgo, 21.Wichita, Kansas (4) Brazil 22.Grandby, Canada (4) 25.Berea, Ohio Ramos Arizpe, 26.Richland Hills, Texas Mexico (4) 27.Bethel, Connecticut (22 Manufacturing 28.Barberton, Ohio Plants) 29.Knowsley, United Kingdom 30.Eindhoven, Netherlands 31.Suzhou, China 32.Shanghai, China 33.Itupeva, Brazil 34.Odkarby, Finland Manitowoc, Wisconsin (1) (4) (34 Manufacturing Plants) (1) Facility is not included in manufacturing plants total as it is also included as part of another segment. (2) There are two manufacturing plants located at Suzhou, China. (3) Facility is not included in manufacturing plants total as it is a design center/lab. (4) Facility added in connection with the acquisition of Spartech on March 13, 2013. (5) Facility added in connection with the JE.A. Richardson, Executive Vice President and Chief Financial Officer** 101 .INS XBRL Instance Document** 101 .SCH XBRL Taxonomy Extension Schema Document** 101 .CAL XBRL Taxonomy Extension Calculation Linkbase Document** 101 .LAB XBRL Taxonomy Extension Label Linkbase Document** 101 .PRE XBRL Taxonomy Extension Presentation Linkbase Document** 101 .DEF XBRL Taxonomy Definition Linkbase Document** + Indicates management contract or compensatory plan, contract or arrangement in which one or more directors or executive officers of the Registrant may be participants † The exhibits and schedules have been omitted pursuant to Item 601(b)(2) of Regulation S-K and will be provided to the Securities and Exchange Commission upon request. ** Filed herewith.

Remi de 10.Shenzhen, China 9.Lehigh, Canada 8.Muncie, Indiana Napierville, 11.Birmingham, Pennsylvania (8 Distribution 9.Newark, New Quebec, Canada Alabama 10.Vonore, Facilities) Jersey 11.Dongguan, China Shanghai, China (3) Tennessee 10.Paulding, Ohio 12.Lockport, New (11 Manufacturing 11.Toluca, Mexico 11.Pleasant Hill, Iowa York Plants) 12.Assesse, Belgium 12.Portage, 13.Ramos Arizpe, 13.Cergy, France Wisconsin Mexico 14.Tossiat, France 13.Ripon, Wisconsin (13 Manufacturing 15.Gyor, Hungary 14.Salisbury, Plants) 16.Kutno, Poland Maryland 17.Pune, India 15.Sheboygan Falls, 18.Pamplona, Spain Wisconsin 19.Bangkok, Thailand 16.Stamford, 20.Pudong Connecticut (Shanghai), 17.Wichita, Kansas China 18.Granby, 21.Jeddah, Saudi Quebec, Canada Arabia Maryland Heights, Shenzhen, China (1) Missouri (3) 22.Tianjin, China (18 Manufacturing 23.Novo Hamburgo, Plants) Brazil 24.Berea, Ohio 25.Richland Hills, Texas 26.Bethel, Connecticut 27.Barberton, Ohio 28.Knowsley, United Kingdom 29.Eindhoven, Netherlands 30.Suzhou, China 31.Shanghai, China 32.Itupeva, Brazil 33.Odkarby, Finland Manitowoc, Wisconsin (1) (33 Manufacturing Plants) (1) Facility is not included in manufacturing plants total as it is also included as part of another segment. (2) There are two manufacturing plants located at Suzhou, China. (3) Facility is not included in manufacturing plants total as it is a design center/lab. Richardson, Executive Vice President and Chief Financial Officer** 101 .INS XBRL Instance Document** 101 .SCH XBRL Taxonomy Extension Schema Document** 101 .CAL XBRL Taxonomy Extension Calculation Linkbase Document** 101 .LAB XBRL Taxonomy Extension Label Linkbase Document** 101 .PRE XBRL Taxonomy Extension Presentation Linkbase Document** 101 .DEF XBRL Taxonomy Definition Linkbase Document** + Indicates management contract or compensatory plan, contract or arrangement in which one or more directors or executive officers of the Registrant may be participants † The exhibits and schedules have been omitted pursuant to Item 601(b)(2) of Regulation S-K and will be provided to the Securities and Exchange Commission upon request. ** Filed herewith.

Odkarby, Finland Manitowoc, Wisconsin (1) (35 Manufacturing Plants) (1) Facility is not included in manufacturing plants total as it is also included as part of another segment. (2) There are two manufacturing plants located at Suzhou, China. (3) Facility is not included in manufacturing plants total as it is a design center/lab. (4) There are two manufacturing plants located at Shanghai, China 16 POLYONE CORPORATION ITEM 3. Richardson, Executive Vice President and Chief Financial Officer** 101 .INS XBRL Instance Document** 101 .SCH XBRL Taxonomy Extension Schema Document** 101 .CAL XBRL Taxonomy Extension Calculation Linkbase Document** 101 .LAB XBRL Taxonomy Extension Label Linkbase Document** 101 .PRE XBRL Taxonomy Extension Presentation Linkbase Document** 101 .DEF XBRL Taxonomy Definition Linkbase Document** + Indicates management contract or compensatory plan, contract or arrangement in which one or more directors or executive officers of the Registrant may be participants † The exhibits and schedules have been omitted pursuant to Item 601(b)(2) of Regulation S-K and will be provided to the Securities and Exchange Commission upon request. ** Filed herewith.