secwatch / observer
8-K filed February 27, 2026, 6:59 PM ET ticker RNA CIK 0002093101
other material confidence high sentiment neutral materiality 0.75

Atrium Therapeutics completes spin-off from Avidity; begins trading under RNA on Nasdaq

Atrium Therapeutics, Inc.

Machine-readable event card

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Atrium Therapeutics, Inc.
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2026-02-27T23:59:59+00:00
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Source-grounded claims

076b3af353f4c5e698a278aef2405054bc5133c5

Atrium Therapeutics, Inc. completed a disposition involving Avidity Biosciences, Inc. (closed 2026-02-26).

Avidity Biosciences, Inc. (“Avidity”) completed the previously announced separation of all of its assets and liabilities exclusively related to its early stage precision cardiology programs

SEC 8-K Item 2.01/5.01 confidence 0.9 SEC evidence

cf87c733870e51fd9dd15fd3fe9a0c20a1de51a3

Atrium Therapeutics, Inc. entered into Transition Services Agreement with Avidity Biosciences, Inc. valued at Company and Avidity entered into a Transition Services Agreement pursuant to which Avidity will prov (effective 2026-02-26).

☐ Item 1.01 Entry into a Material Definitive Agreement On February 26, 2026, Avidity Biosciences, Inc. (“Avidity”) completed the previously announced separation of all of its assets and liabilities exclusively related to its early stage precision cardiology programs, including ATR 1086 and ATR 1072, and certain collaboration agreements, consisting of those with Bristol-Myers Squibb Company and Eli Lilly and Company, into a separate, independent publicly traded company (the “Separation”), Atrium Therapeutics, Inc.

SEC 8-K Item 1.01/1.02 confidence 0.95 SEC evidence

fa798de82be4b3e13fbd3141a0e1e02c83e25595

Atrium Therapeutics, Inc. entered into Amended and Restated License Agreement with Avidity Biosciences, Inc. valued at Company entered into an Amended and Restated License Agreement with Avidity, amending the original l (effective 2026-02-26).

On February 26, 2026, the Company entered into an Amended and Restated License Agreement (“Amended and Restated License Agreement”) with Avidity amending the original license agreement between the Company and Avidity, dated October 25, 2025 (the “Original License Agreement”), pursuant to which the Company granted to Avidity certain exclusive and non-exclusive licenses under the Company’s platform technology and other intellectual property, and Avidity granted to the Company certain exclusive and non-exclusive licenses under certain intellectual property owned or controlled by Avidity and its subsidiaries following the Separation, as further described in the section of the Information Statement (the “Information Statement”) entitled “Business—Intellectual Property—RemainCo License Agreement” filed as Exhibit 99.1 to Amendment No. 2 to the Registration Statement on Form 10 (the “Form 10”), filed by the Company with the Securities and Exchange Commission on February 17, 2026.

SEC 8-K Item 1.01/1.02 confidence 0.95 SEC evidence

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☐ Item 1.01 Entry into a Material Definitive Agreement On February 26, 2026, Avidity Biosciences, Inc. (“Avidity”) completed the previously announced separation of all of its assets and liabilities exclusively related to its early stage precision cardiology programs, including ATR 1086 and ATR 1072, and certain collaboration agreements, consisting of those with Bristol-Myers Squibb Company and Eli Lilly and Company, into a separate, independent publicly traded company (the “Separation”), Atrium Therapeutics, Inc.

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☐ Item 1.01 Entry into a Material Definitive Agreement On February 26, 2026, Avidity Biosciences, Inc. (“Avidity”) completed the previously announced separation of all of its assets and liabilities exclusively related to its early stage precision cardiology programs, including ATR 1086 and ATR 1072, and certain collaboration agreements, consisting of those with Bristol-Myers Squibb Company and Eli Lilly and Company, into a separate, independent publicly traded company (the “Separation”), Atrium Therapeutics, Inc.

Comparable filing

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This filing

☐ Item 1.01 Entry into a Material Definitive Agreement On February 26, 2026, Avidity Biosciences, Inc. (“Avidity”) completed the previously announced separation of all of its assets and liabilities exclusively related to its early stage precision cardiology programs, including ATR 1086 and ATR 1072, and certain collaboration agreements, consisting of those with Bristol-Myers Squibb Company and Eli Lilly and Company, into a separate, independent publicly traded company (the “Separation”), Atrium Therapeutics, Inc.

Comparable filing

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This filing

☐ Item 1.01 Entry into a Material Definitive Agreement On February 26, 2026, Avidity Biosciences, Inc. (“Avidity”) completed the previously announced separation of all of its assets and liabilities exclusively related to its early stage precision cardiology programs, including ATR 1086 and ATR 1072, and certain collaboration agreements, consisting of those with Bristol-Myers Squibb Company and Eli Lilly and Company, into a separate, independent publicly traded company (the “Separation”), Atrium Therapeutics, Inc.

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This filing

☐ Item 1.01 Entry into a Material Definitive Agreement On February 26, 2026, Avidity Biosciences, Inc. (“Avidity”) completed the previously announced separation of all of its assets and liabilities exclusively related to its early stage precision cardiology programs, including ATR 1086 and ATR 1072, and certain collaboration agreements, consisting of those with Bristol-Myers Squibb Company and Eli Lilly and Company, into a separate, independent publicly traded company (the “Separation”), Atrium Therapeutics, Inc.

Comparable filing

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same fact type: material_agreement same SEC item: 1.01, 9.01 same event type: other_material similar materiality

This filing

☐ Item 1.01 Entry into a Material Definitive Agreement On February 26, 2026, Avidity Biosciences, Inc. (“Avidity”) completed the previously announced separation of all of its assets and liabilities exclusively related to its early stage precision cardiology programs, including ATR 1086 and ATR 1072, and certain collaboration agreements, consisting of those with Bristol-Myers Squibb Company and Eli Lilly and Company, into a separate, independent publicly traded company (the “Separation”), Atrium Therapeutics, Inc.

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This filing

☐ Item 1.01 Entry into a Material Definitive Agreement On February 26, 2026, Avidity Biosciences, Inc. (“Avidity”) completed the previously announced separation of all of its assets and liabilities exclusively related to its early stage precision cardiology programs, including ATR 1086 and ATR 1072, and certain collaboration agreements, consisting of those with Bristol-Myers Squibb Company and Eli Lilly and Company, into a separate, independent publicly traded company (the “Separation”), Atrium Therapeutics, Inc.

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same fact type: material_agreement same SEC item: 1.01, 9.01 same event type: other_material similar materiality

This filing

☐ Item 1.01 Entry into a Material Definitive Agreement On February 26, 2026, Avidity Biosciences, Inc. (“Avidity”) completed the previously announced separation of all of its assets and liabilities exclusively related to its early stage precision cardiology programs, including ATR 1086 and ATR 1072, and certain collaboration agreements, consisting of those with Bristol-Myers Squibb Company and Eli Lilly and Company, into a separate, independent publicly traded company (the “Separation”), Atrium Therapeutics, Inc.

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Source: SEC EDGAR
accession 0001193125-26-083227

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