Pro Forma The Company acquired the Clariant Masterbatch business (“CMB”) on July 1, 2020 (the “Acquisition Date”). 2) Tax adjustments include the net tax benefit/(expense) from one-time income tax items, the set-up or reversal of uncertain tax position reserves and deferred income tax valuation allowance adjustments. 9 Attachment 4 Condensed Consolidated Balance Sheets (Unaudited) March 31, 2021 2020 ASSETS Current assets: Cash and cash equivalents $ 594.5 $ 649.5 Accounts receivable, net 642.2 516.6 Inventories, net 357.0 327.5 Other current assets 122.7 108.5 Total current assets 1,716.4 1,602.1 Property, net 675.5 694.9 Goodwill 1,281.9 1,308.1 Intangible assets, net 973.3 1,008.5 Operating lease assets, net 80.9 80.9 Other non-current assets 181.4 176.0 Total assets $ 4,909.4 $ 4,870.5 LIABILITIES AND SHAREHOLDERS' EQUITY Current liabilities: Short-term and current portion of long-term debt $ 18.8 $ 18.6 Accounts payable 529.6 471.7 Current operating lease obligations 24.3 25.1 Accrued expenses and other current liabilities 290.9 285.6 Total current liabilities 863.6 801.0 Non-current liabilities: Long-term debt 1,852.7 1,854.0 Pension and other post-retirement benefits 111.3 115.0 Non-current operating lease obligations 56.8 56.0 Other non-current liabilities 303.0 332.8 Total non-current liabilities 2,323.8 2,357.8 SHAREHOLDERS' EQUITY Avient shareholders’ equity 1,707.0 1,697.1 Noncontrolling interest 15.0 14.6 Total equity 1,722.0 1,711.7 Total liabilities and equity $ 4,909.4 $ 4,870.5 10 Attachment 5 Condensed Consolidated Statements of Cash Flows (Unaudited) March 31, 2021 2020 Operating Activities Net income $ 79.7 $ 32.8 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation and amortization 36.6 19.9 Accelerated depreciation and amortization 0.5 — Share-based compensation expense 2.7 2.1 Changes in assets and liabilities, net of the effect of acquisitions: Increase in accounts receivable (137.6) (56.9) Increase in inventories (35.1) (13.0) Increase in accounts payable 67.3 44.6 Decrease in pension and other post-retirement benefits (7.1) (3.2) Increase in post-acquisition earnout liabilities — 1.0 Decrease in accrued expenses and other assets and liabilities, net (3.4) (19.1) Payment of post-acquisition date earnout liability — (21.0) Net cash provided (used) by operating activities 3.6 (12.8) Investing activities Capital expenditures (16.5) (11.1) Net proceeds from divestiture — 7.1 Net proceeds (used) provided by other assets (2.0) 5.2 Net cash (used) provided by investing activities (18.5) 1.2 Financing activities Purchase of common shares for treasury (4.2) (13.6) Cash dividends paid (19.5) (15.6) Repayment of long-term debt (2.3) (2.0) Payments of withholding tax on share awards (3.1) (1.3) Equity offering proceeds, net of underwriting discount and issuance costs — 496.3 Payment of acquisition date earnout liability — (32.9) Net cash (used) provided by financing activities (29.1) 430.9 Effect of exchange rate changes on cash (11.0) (3.8) (Decrease) increase in cash and cash equivalents (55.0) 415.5 Cash and cash equivalents at beginning of year 649.5 864.7 Cash and cash equivalents at end of period $ 594.5 $ 1,280.2 11 Attachment 6 Business Segment Operations (Unaudited) Operating income and earnings before interest, taxes, depreciation and amortization (EBITDA) at the segment level does not include: special items as defined in Attachment 3; corporate general and administration costs that are not allocated to segments; intersegment sales and profit eliminations; share-based compensation costs; and certain other items that are not included in the measure of segment profit and loss that is reported to and reviewed by the chief operating decision maker. GAAP Special Adjusted GAAP Special Adjusted Income from continuing operations before income taxes $ 102.6 $ 2.4 $ 105.0 $ 45.0 $ 9.6 $ 54.6 Income tax expense - GAAP (22.9) — (22.9) (11.9) — (11.9) Income tax impact of special items (Attachment 3) — (0.9) (0.9) — (2.0) (2.0) Tax adjustments (Attachment 3) — 1.1 1.1 — 1.0 1.0 Income tax (expense) benefit $ (22.9) $ 0.2 $ (22.7) $ (11.9) $ (1.0) $ (12.9) Effective Tax Rate(1) 22.3 % 21.6 % 26.5 % 23.7 % (1) Rates may not recalculate from figures presented herein due to rounding 13 The following pro forma adjustments are referenced by management to provide comparable business performance by incorporating the Clariant Masterbatch business in periods prior to the acquisition date (July 1, 2020).

If Buyer has a dispute with respect to an invoice, Buyer must notify Seller within seven (7) business days after the date of invoice. Any times or dates for delivery communicated by Seller (including those contained in Seller’s order confirmation) are estimates only and are not terms of the sale. Unless Seller and Buyer have expressly agreed to a firm delivery date term in a single writing signed by both parties, delay in delivery of any Products shall not relieve Buyer of its obligation to accept delivery thereof.

Crist: Senior Vice President, President of Distribution, June 2014 to date. JELLISON Director Date: February 16, 2017 William R. PREETE Director Date: February 16, 2017 Kerry J.

Eastern Time on July 30, 2021. 3 *Pro Forma The company acquired the Clariant Masterbatch business (“CMB”) on July 1, 2020 (the “Acquisition Date”). Three Months Ended June 30, 2021 2020 GAAP Results Special Items Adjusted Results GAAP Results Special Items Adjusted Results $ 89.8 $ 14.2 $ 104.0 $ 31.3 $ 2.4 $ 33.7 Income tax expense - GAAP (20.4) — (20.4) (7.9) — (7.9) Income tax impact of special items (Attachment 3) — (3.4) (3.4) — (0.7) (0.7) Tax adjustments (Attachment 3) — 0.9 0.9 — 0.9 0.9 Income tax (expense) benefit $ (20.4) $ (2.5) $ (22.9) $ (7.9) $ 0.2 $ (7.7) Effective Tax Rate(1) 22.7 % 22.0 % 25.1 % 22.5 % (1) Rates may not recalculate from figures presented herein due to rounding 13 Six Months Ended June 30, 2021 2020 GAAP Results Special Items Adjusted Results GAAP Results Special Items Adjusted Results $ 192.4 $ 16.6 $ 209.0 $ 76.3 $ 12.0 $ 88.3 Income tax expense - GAAP (43.3) — (43.3) (19.8) — (19.8) Income tax impact of special items (Attachment 3) — (4.3) (4.3) — (2.7) (2.7) Tax adjustments (Attachment 3) — 2.0 2.0 — 1.9 1.9 Income tax (expense) benefit $ (43.3) $ (2.3) $ (45.6) $ (19.8) $ (0.8) $ (20.6) Effective Tax Rate(1) 22.5 % 21.8 % 25.9 % 23.3 % (1) Rates may not recalculate from figures presented herein due to rounding The following pro forma adjustments are referenced by management to provide comparable business performance by incorporating the Clariant Masterbatch business in periods prior to the acquisition date (July 1, 2020). Reconciliation of Pro Forma Adjusted Earnings per Share: Three Months Ended June 30, 2020 Six Months Ended June 30, 2020 Year Ended December 31, 2020 Net income from continuing operations attributable to Avient shareholders $ 23.0 $ 56.1 $ 132.0 Special items, after tax 2.6 11.2 24.8 Adjusted net income from continuing operations excluding special items 25.6 67.3 156.8 Clariant MB pro forma adjustments to net income from continuing operations(2) 12.9 20.7 20.7 Pro forma adjusted net income from continuing operations attributable to Avient shareholders $ 38.5 $ 88.0 $ 177.5 Weighted average diluted shares 91.8 89.4 90.6 Pro forma impact to diluted shares from January 2020 equity offering(2) — 2.9 1.5 Pro forma weighted average diluted shares 91.8 92.3 92.1 Adjusted EPS - excluding special items pro forma for Clariant MB acquisition $ 0.42 $ 0.95 $ 1.93 (2) Pro forma adjustments for the periods prior to the acquisition date (July 1, 2020) and to give effects to the financing for the acquisition 14 Three Months Ended June 30, 2020 Reconciliation of Pro Forma Adjusted Earnings per Share Avient Special Items Adjusted Avient Clariant MB Pro Forma Adjustments(2) Pro Forma Adjusted Avient Sales $ 609.1 $ — $ 609.1 $ 261.1 $ 870.2 Operating income $ 38.0 $ 9.0 $ 47.0 $ 22.0 $ 69.0 Interest expense, net (16.2) — (16.2) (5.3) (21.5) Other income, net 9.5 (6.6) 2.9 — 2.9 Income taxes (7.9) 0.2 (7.7) (3.8) (11.5) Net income attributable to noncontrolling interests (0.4) — (0.4) — (0.4) Net income from continuing operations attributable to Avient shareholders $ 23.0 $ 2.6 $ 25.6 $ 12.9 $ 38.5 Weighted average diluted shares 91.8 Pro forma adjusted EPS $ 0.42 (2) Pro forma adjustments for the periods prior to the acquisition date (July 1, 2020) and to give effects to the financing for the acquisition Six Months Ended June 30, 2020 Reconciliation of Pro Forma Adjusted Earnings per Share: Avient Special Items Adjusted Avient Clariant MB Pro Forma Adjustments(2) Pro Forma Adjusted Avient Sales $ 1,320.6 $ — $ 1,320.6 $ 540.5 $ 1,861.1 Operating income $ 90.8 $ 18.7 $ 109.5 $ 45.0 $ 154.5 Interest expense, net (25.6) — (25.6) (18.1) (43.7) Other income, net 11.1 (6.7) 4.4 — 4.4 Income taxes (19.8) (0.8) (20.6) (6.2) (26.8) Net income attributable to noncontrolling interests (0.4) — (0.4) — (0.4) Net income from continuing operations attributable to Avient shareholders $ 56.1 $ 11.2 $ 67.3 $ 20.7 $ 88.0 Weighted average diluted shares 89.4 Impact to diluted shares from January 2020 equity offering 2.9 Pro forma weighted average diluted shares 92.3 Pro forma adjusted EPS $ 0.95 (2) Pro forma adjustments for the periods prior to the acquisition date (July 1, 2020) and to give effects to the financing for the acquisition 15 Reconciliation of EBITDA by Segment Three Months Ended June 30, Six Months Ended June 30 2021 2020 2021 2020 Operating income: Color, Additives and Inks $ 86.3 $ 32.3 $ 175.1 $ 72.8 Specialty Engineered Materials 37.3 17.0 71.5 39.3 Distribution 23.7 14.6 47.7 34.0 Corporate and eliminations (39.2) (25.9) (65.8) (55.3) Operating income $ 108.1 $ 38.0 $ 228.5 $ 90.8 Items below OI in Corporate: Other income, net $ 1.2 $ 9.5 $ 2.7 $ 11.1 Depreciation & amortization: Color, Additives and Inks $ 25.3 $ 10.6 $ 52.6 $ 21.6 Specialty Engineered Materials 8.1 7.6 15.9 15.1 Distribution 0.2 0.1 0.4 0.2 Corporate and eliminations 0.2 2.6 2.0 3.9 Depreciation & Amortization $ 33.8 $ 20.9 $ 70.9 $ 40.8 EBITDA: Color, Additives and Inks $ 111.6 $ 42.9 $ 227.7 $ 94.4 Specialty Engineered Materials 45.4 24.6 87.4 54.4 Distribution 23.9 14.7 48.1 34.2 Corporate and eliminations (39.0) (23.3) (63.8) (51.4) EBITDA $ 143.1 $ 68.4 $ 302.1 $ 142.7 EBITDA as a % of Sales: Color, Additives and Inks 17.9 % 18.9 % 18.5 % 19.5 % Specialty Engineered Materials 18.9 % 15.5 % 19.1 % 15.8 % Distribution 5.9 % 6.2 % 6.3 % 6.5 % 16 Reconciliation of Pro Forma EBITDA - Color, Additives and Inks Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Sales: Color, Additives and Inks $ 624.4 $ 226.8 $ 1,233.7 $ 483.3 Clariant MB pro forma adjustments(2) — 261.1 — 540.5 Pro forma sales $ 624.4 $ 487.9 $ 1,233.7 $ 1,023.8 Operating income: Color, Additives and Inks $ 86.3 $ 32.3 $ 175.1 $ 72.8 Clariant MB pro forma adjustments(2) — 22.0 — 45.0 Pro forma operating income $ 86.3 $ 54.3 $ 175.1 $ 117.8 Depreciation & amortization: Color, Additives and Inks $ 25.3 $ 10.6 $ 52.6 $ 21.6 Clariant MB pro forma adjustments(2) — 15.0 — 30.1 Pro forma depreciation & amortization $ 25.3 $ 25.6 $ 52.6 $ 51.7 Earnings Before Interest, Taxes, Depreciation and Amortization (EBITDA): Color, Additives and Inks $ 111.6 $ 42.9 $ 227.7 $ 94.4 Clariant MB pro forma adjustments(2) — 37.0 — 75.1 Pro forma EBITDA $ 111.6 $ 79.9 $ 227.7 $ 169.5 Pro forma EBITDA as a % of Sales 17.9 % 16.4 % 18.5 % 16.6 % (2) Pro forma adjustments for the periods prior to the acquisition date (July 1, 2020) and to give effects to the financing for the acquisition Three Months Ended June 30, Six Months Ended June 30, Reconciliation to Pro Forma Adjusted EBITDA: 2021 2020 2021 2020 Net income from continuing operations – GAAP $ 69.4 $ 23.4 $ 149.1 $ 56.5 Income tax expense 20.4 7.9 43.3 19.8 Interest expense 19.5 16.2 38.8 25.6 Depreciation and amortization from continuing operations 33.8 20.9 70.9 40.8 EBITDA $ 143.1 $ 68.4 $ 302.1 $ 142.7 Special items, before tax 14.2 2.4 16.6 12.0 Interest expense included in special items — (0.5) — (0.5) Depreciation and amortization included in special items 1.4 (1.2) 0.8 (1.2) Adjusted EBITDA $ 158.7 $ 69.1 $ 319.5 $ 153.0 Clariant MB pro forma adjustments(2) — 37.0 — 75.1 Pro forma adjusted EBITDA $ 158.7 $ 106.1 $ 319.5 $ 228.1

https://www.avient.com/investors https://edge.media-server.com/mmc/p/yrq7mgm9 https://edge.media-server.com/mmc/p/yrq7mgm9 https://www.avient.com/investors 3 Full Year Comparisons Pro Forma for Acquisition of Clariant’s Color Business The company acquired Clariant’s color (“Clariant Color”) business on July 1, 2020 (the “Acquisition Date”). Three Months Ended September 30, 2021 2020 GAAP Results Special Items Adjusted Results GAAP Results Special Items Adjusted Results $ 61.1 $ 19.9 $ 81.0 $ 5.3 $ 50.0 $ 55.3 Income tax expense - GAAP (8.5) — (8.5) (2.7) — (2.7) Income tax impact of special items (Attachment 3) — (4.6) (4.6) — (12.7) (12.7) Tax adjustments (Attachment 3) — (3.6) (3.6) — 3.0 3.0 Income tax (expense) benefit $ (8.5) $ (8.2) $ (16.7) $ (2.7) $ (9.7) $ (12.4) Effective Tax Rate(1) 14.1 % 20.8 % 51.9 % 22.7 % (1) Rates may not recalculate from figures presented herein due to rounding 14 Nine Months Ended September 30, 2021 2020 GAAP Results Special Items Adjusted Results GAAP Results Special Items Adjusted Results $ 253.5 $ 36.5 $ 290.0 $ 81.6 $ 62.0 $ 143.6 Income tax expense - GAAP (51.8) — (51.8) (22.5) — (22.5) Income tax impact of special items (Attachment 3) — (8.9) (8.9) — (15.4) (15.4) Tax adjustments (Attachment 3) — (1.6) (1.6) — 4.9 4.9 Income tax (expense) benefit $ (51.8) $ (10.5) $ (62.3) $ (22.5) $ (10.5) $ (33.0) Effective Tax Rate(1) 20.5 % 21.5 % 27.6 % 23.0 % (1) Rates may not recalculate from figures presented herein due to rounding The following pro forma adjustments are referenced by management to provide comparable business performance by incorporating the Clariant Masterbatch business in periods prior to the acquisition date (July 1, 2020). Reconciliation of Pro Forma Adjusted Earnings per Share: Nine Months Ended September 30, 2020 Year Ended December 31, 2020 Net income from continuing operations attributable to Avient shareholders $ 57.8 $ 132.0 Special items, after tax 42.0 24.8 Adjusted net income from continuing operations excluding special items 99.8 156.8 Clariant MB pro forma adjustments to net income from continuing operations(2) 20.7 20.7 Pro forma adjusted net income from continuing operations attributable to Avient shareholders $ 120.5 $ 177.5 Weighted average diluted shares 90.7 90.6 Pro forma impact to diluted shares from January 2020 equity offering(2) 2.9 1.5 Pro forma weighted average diluted shares 93.6 92.1 Adjusted EPS - excluding special items pro forma for Clariant MB acquisition $ 1.29 $ 1.93 (2) Pro forma adjustments for the periods prior to the acquisition date (July 1, 2020) and to give effects to the financing for the acquisition 15 Nine Months Ended September 30, 2020 Reconciliation of Pro Forma Adjusted Earnings per Share: Avient Special Items Adjusted Avient Clariant MB Pro Forma Adjustments(2) Pro Forma Adjusted Avient Sales $ 2,245.1 $ — $ 2,245.1 $ 540.5 $ 2,785.6 Operating income $ 124.3 $ 59.1 $ 183.4 $ 45.0 $ 228.4 Interest expense, net (55.3) — (55.3) (18.1) (73.4) Pension settlement gain and mark-to-market adjustment — (6.9) (6.9) — (6.9) Other income, net 12.6 0.3 12.9 — 12.9 Income taxes (22.5) (10.5) (33.0) (6.2) (39.2) Net income attributable to noncontrolling interests (1.3) — (1.3) — (1.3) Net income from continuing operations attributable to Avient shareholders $ 57.8 $ 42.0 $ 99.8 $ 20.7 $ 120.5 Weighted average diluted shares 90.7 Impact to diluted shares from January 2020 equity offering 2.9 Pro forma weighted average diluted shares 93.6 Pro forma adjusted EPS $ 1.29 (2) Pro forma adjustments for the periods prior to the acquisition date (July 1, 2020) and to give effects to the financing for the acquisition 16 Reconciliation of EBITDA by Segment Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Operating income: Color, Additives and Inks $ 66.8 $ 50.5 $ 241.9 $ 123.3 Specialty Engineered Materials 31.7 24.7 103.2 64.0 Distribution 23.8 17.5 71.5 51.5 Corporate and eliminations (43.6) (59.2) (109.4) (114.5) Operating income $ 78.7 $ 33.5 $ 307.2 $ 124.3 Items below OI in Corporate: Other income, net $ 1.4 $ 1.5 $ 4.1 $ 12.6 Depreciation & amortization: Color, Additives and Inks $ 26.6 $ 26.3 $ 79.2 $ 48.0 Specialty Engineered Materials 7.9 7.5 23.8 22.7 Distribution 0.2 0.2 0.6 0.4 Corporate and eliminations 2.1 2.5 4.1 6.2 Depreciation & Amortization $ 36.8 $ 36.5 $ 107.7 $ 77.3 EBITDA: Color, Additives and Inks $ 93.4 $ 76.8 $ 321.1 $ 171.3 Specialty Engineered Materials 39.6 32.2 127.0 86.7 Distribution 24.0 17.7 72.1 51.9 Corporate and eliminations (41.5) (56.7) (105.3) (108.3) EBITDA $ 116.9 $ 71.5 $ 419.0 $ 214.2 EBITDA as a % of Sales: Color, Additives and Inks 15.9 % 15.6 % 17.6 % 17.5 % Specialty Engineered Materials 17.0 % 18.5 % 18.4 % 16.7 % Distribution 5.5 % 6.4 % 6.0 % 6.4 % 17 Reconciliation of Pro Forma EBITDA - Color, Additives and Inks Nine Months Ended September 30, 2020 Sales: Color, Additives and Inks $ 977.1 Clariant MB pro forma adjustments(2) 540.5 Pro forma sales $ 1,517.6 Operating income: Color, Additives and Inks $ 123.3 Clariant MB pro forma adjustments(2) 45.0 Pro forma operating income $ 168.3 Depreciation & amortization: Color, Additives and Inks $ 48.0 Clariant MB pro forma adjustments(2) 30.1 Pro forma depreciation & amortization $ 78.1 Earnings Before Interest, Taxes, Depreciation and Amortization (EBITDA): Color, Additives and Inks $ 171.3 Clariant MB pro forma adjustments(2) 75.1 Pro forma EBITDA $ 246.4 Pro forma EBITDA as a % of Sales 16.2 % (2) Pro forma adjustments for the periods prior to the acquisition date (July 1, 2020) and to give effects to the financing for the acquisition Three Months Ended September 30, Nine Months Ended September 30, Reconciliation to EBITDA and Pro Forma Adjusted EBITDA: 2021 2020 2021 2020 Net income from continuing operations – GAAP $ 52.6 $ 2.6 $ 201.7 $ 59.1 Income tax expense 8.5 2.7 51.8 22.5 Interest expense 19.0 29.7 57.8 55.3 Depreciation and amortization from continuing operations 36.8 36.5 107.7 77.3 EBITDA $ 116.9 $ 71.5 $ 419.0 $ 214.2 Special items, before tax 19.9 50.0 36.5 62.0 Interest expense included in special items — (9.6) — (10.1) Depreciation and amortization included in special items (0.9) (1.3) (0.1) (2.5) Adjusted EBITDA $ 135.9 $ 110.6 $ 455.4 $ 263.6 Clariant MB pro forma adjustments(2) — — — 75.1 Pro forma adjusted EBITDA $ 135.9 $ 110.6 $ 455.4 $ 338.7 (2) Pro forma adjustments for the periods prior to the acquisition date (July 1, 2020) and to give effects to the financing for the acquisition NEWS RELEASE Attachment 1

Limited PO Box 2137, Jeddah 22758, Saudi Arabia Has been assessed and found to meet the requirements of ISO 45001:2018 This certificate is valid for the following scope of operations: Production and Supply of Color and Additive Master Batches Authorised by: Stan Wright Director Date of Certificate Issue: 30 December 2021 Certificate Valid Until: 29 December 2024 Recertification audit before 30 November 2024.

PAYMENTS Unless otherwise directed or agreed to by Seller, all invoices are payable thirty (30) days after the date of invoice. DELIVERIES Delivery dates as stated in the offer are for indication only and Seller is entitled to make partial deliveries, unless the parties expressly agree otherwise. Seller shall make its best efforts to cause the Products to be delivered on such dates.

This is to confirm that the Environmental, Health, Safety and Security Management System of: Avient Corporation HQ 33587 Walker Road The Environmental, Health, Safety and Security Management System is applicable to: Certificate No: 65536 Effective Date: 29 September 2023 Expiration Date: 28 September 2026 Revision Date: 22 November 2023 Dominic Townsend, President CORPORATE SUPPORT ACTIVITIES, DESIGN, MANUFACTURE AND DISTRIBUTION OF COLOUR AND ADDITIVE CONCENTRATES, THERMOPLASTIC RESINS AND PELLETS, SPECIALTY COMPOUNDS AND COLORANTS.

This is to certify that the Environmental Management System of: Avient Corporation HQ 33587 Walker Road The Environmental Management System is applicable to: Certificate No: 65537 Effective Date: 29 September 2023 Expiration Date: 27 September 2026 Revision Date: 22 November 2023 Dominic Townsend, President CORPORATE SUPPORT ACTIVITIES, DESIGN, MANUFACTURE AND DISTRIBUTION OF COLOUR AND ADDITIVE CONCENTRATES, THERMOPLASTIC RESINS AND PELLETS, SPECIALTY COMPOUNDS AND COLORANTS.

Newlin: Chairman, President and Chief Executive Officer, February 2006 to date. Kahler: Senior Vice President, Chief Commercial Officer, January 2010 to date. Principal Financial and Accounting Officer) Date: February 12, /S/ CAROL A.