Applied Optoelectronics Inc. Watch

from 10-K ~5 pages Description of the Company’s Common Stock Registered Under Section 12 of the Exchange Act of 1934

from 8-K 5 pages First Supplemental Indenture

from 8-K 127 pages Applied Optoelectronics, Inc., and Computershare Trust Company, N.A. as Trustee Indenture Dated as of December 5, 2023 5.250% Convertible Senior Notes Due 2026

from 8-K 2 pages Indenture or similar

from 8-K 2 pages Ao Applied Optoelectronics, Inc. Incorporated Under the Laws of the State of Delaware See Reverse Side for Certain Definitions Fully Paid and Non-Assessable Common Shares, $0.001 Par Value, of Applied Optoelectronics, Inc. Transferable on the Books of the Corporation Bycthe Hoolder Mhereof Imn Persoon or Bny Attorney Upon Surrender of This Certificate Properly Endorsed. This Certificate Is Not Valid Until Countersigned and Registered by the Transfer Agent and Registrar. in Witness Whereof, the Said Corporation Has Caused This Certificate to Be Signed by Facsimile Signatures of Its Duly Authorized Officers. Dated: Seal 2013 ★ President and CEO General Counsel and Secretary American Financial Printing Incorporated – Minneapolis L O Countersigned and Registered: Continental Stock Transfer & Trust Company Transfer Agent and Registrar by Authorized Signature P This Certifies That Is the Owner of Cusip 03823u 10 2

from 10-K ~5 pages Description of the Company’s Common Stock Registered Under Section 12 of the Exchange Act of 1934

from 8-K 2 pages Promissory Note

from 8-K 113 pages Applied Optoelectronics, Inc., and Wells Fargo Bank, National Association as Trustee Indenture Dated as of March 5, 2019 5.00% Convertible Senior Notes Due 2024

from 8-K 2 pages Ao Applied Optoelectronics, Inc. Incorporated Under the Laws of the State of Delaware See Reverse Side for Certain Definitions Fully Paid and Non-Assessable Common Shares, $0.001 Par Value, of Applied Optoelectronics, Inc. Transferable on the Books of the Corporation Bycthe Hoolder Mhereof Imn Persoon or Bny Attorney Upon Surrender of This Certificate Properly Endorsed. This Certificate Is Not Valid Until Countersigned and Registered by the Transfer Agent and Registrar. in Witness Whereof, the Said Corporation Has Caused This Certificate to Be Signed by Facsimile Signatures of Its Duly Authorized Officers. Dated: Seal 2013 ★ President and CEO General Counsel and Secretary American Financial Printing Incorporated – Minneapolis L O Countersigned and Registered: Continental Stock Transfer & Trust Company Transfer Agent and Registrar by Authorized Signature P This Certifies That Is the Owner of Cusip 03823u 10 2

from 8-K 2 pages Ao Applied Optoelectronics, Inc. Incorporated Under the Laws of the State of Delaware See Reverse Side for Certain Definitions Fully Paid and Non-Assessable Common Shares, $0.001 Par Value, of Applied Optoelectronics, Inc. Transferable on the Books of the Corporation Bycthe Hoolder Mhereof Imn Persoon or Bny Attorney Upon Surrender of This Certificate Properly Endorsed. This Certificate Is Not Valid Until Countersigned and Registered by the Transfer Agent and Registrar. in Witness Whereof, the Said Corporation Has Caused This Certificate to Be Signed by Facsimile Signatures of Its Duly Authorized Officers. Dated: Seal 2013 ★ President and CEO General Counsel and Secretary American Financial Printing Incorporated – Minneapolis L O Countersigned and Registered: Continental Stock Transfer & Trust Company Transfer Agent and Registrar by Authorized Signature P This Certifies That Is the Owner of Cusip 03823u 10 2

from 8-K 2 pages Ao Applied Optoelectronics, Inc. Incorporated Under the Laws of the State of Delaware See Reverse Side for Certain Definitions Fully Paid and Non-Assessable Common Shares, $0.001 Par Value, of Applied Optoelectronics, Inc. Transferable on the Books of the Corporation Bycthe Hoolder Mhereof Imn Persoon or Bny Attorney Upon Surrender of This Certificate Properly Endorsed. This Certificate Is Not Valid Until Countersigned and Registered by the Transfer Agent and Registrar. in Witness Whereof, the Said Corporation Has Caused This Certificate to Be Signed by Facsimile Signatures of Its Duly Authorized Officers. Dated: Seal 2013 ★ President and CEO General Counsel and Secretary American Financial Printing Incorporated – Minneapolis L O Countersigned and Registered: Continental Stock Transfer & Trust Company Transfer Agent and Registrar by Authorized Signature P This Certifies That Is the Owner of Cusip 03823u 10 2 Number Shares Applied Optoelectronics,inc. Corporate Delaware

from S-1 16 pages Third Amended and Restated Shareholders’ Agreement of Applied Optoelectronics, Inc

from S-1 15 pages Applied Optoelectronics, Inc. Registration Rights Agreement

from DRS 16 pages Third Amended and Restated Shareholders’ Agreement of Applied Optoelectronics, Inc

from DRS 15 pages Applied Optoelectronics, Inc. Registration Rights Agreement