Document:

EX-4.1

 Exhibit 4.1 

FIRST SUPPLEMENTAL INDENTURE 

First Supplemental Indenture (this “Supplemental Indenture”), dated as of May 1, 2020, among Kaiser Aluminum Corporation, a
Delaware corporation (the “Company”), certain of the Company’s direct and indirect subsidiaries parties hereto (each a “Subsidiary Guarantor” and collectively, the “Subsidiary Guarantors”) and Wells Fargo Bank,
National Association, as trustee (in such capacity, the “Trustee”). Capitalized terms used herein and not otherwise defined shall have the meanings assigned to them in the Base Indenture (as defined below). 

W I T N E S S E T H 
 WHEREAS,
the Company, the Subsidiary Guarantors and the Trustee are party to an indenture dated as of April 28, 2020 (the “Base Indenture”) relating to the Company’s 6.500% Senior Notes due 2025 (the “Notes”); 

WHEREAS, the Company previously issued $300,000,000 initial aggregate principal amount of the Notes (the “Existing Notes”) on
April 28, 2020; 
 WHEREAS, Sections 202, 301 and 312 of the Base Indenture provide that the Company may, from time to time and in
accordance therewith, create and issue Additional Notes under the Base Indenture; 
 WHEREAS, the Company wishes to issue an additional
$50,000,000 aggregate principal amount of the Notes as Additional Notes (the “New Notes”); 
 WHEREAS, the Company and the
Subsidiary Guarantors are authorized to execute and deliver this Supplemental Indenture; 
 WHEREAS, the Company has requested that the
Trustee execute and deliver this Supplemental Indenture; and 
 WHEREAS, all conditions and requirements necessary to the execution and
delivery of this Supplemental Indenture have been done and performed, and the execution and delivery hereof has been in all respects authorized. 

NOW, THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged,
the parties to this Supplemental Indenture mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows: 

1.    Amount of New Notes. The aggregate principal amount of New Notes to be authenticated and delivered under this
Supplemental Indenture on May 1, 2020 is $50,000,000. 
 2.    Terms of New Notes. The New Notes are to be
issued as Additional Notes under the Base Indenture and shall: 
  

	 	a.	 be issued as part of the existing series of Existing Notes under the Base Indenture, and the New Notes and the
Existing Notes shall be a single class for all purposes under the Indenture (as defined in the Base Indenture), including, without limitation, with respect to waivers, amendments, redemptions and offers to purchase; 

 

	 	b.	 be issued on May 1, 2020 and will accrue interest from April 28, 2020; 

	 	c.	 be issuable in whole in the form of one or more Global Notes to be issued in the name of Cede & Co.
and held by the Trustee as Custodian for the Depositary and in the form, including appropriate transfer restriction legends, provided in Exhibit 1 to Appendix A to the Base Indenture; and 

 

	 	d.	 bear, in the case of New Notes offered and sold to QIBs in reliance on Rule 144A under the Securities Act, the
CUSIP number of 483007AK6 and ISIN of US483007AK64, and, in the case of New Notes offered and sold in reliance on Regulation S under the Securities Act, the CUSIP number of U24442AD4 and ISIN of USU24442AD46. 

4.    Ratification of Base Indenture; Supplemental Indenture Part of Indenture. Except as expressly amended hereby,
the Base Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture for all purposes, and every
Holder of Notes heretofore or hereafter authenticated and delivered shall be bound hereby. 
 5.    Governing
Law. This Supplemental Indenture shall be governed by, and construed in accordance with, the laws of the State of New York. 

6.    Counterparts. This Supplemental Indenture may be executed in any number of counterparts, each of which shall
be original; but such counterparts shall together constitute but one and the same instrument. One signed copy is enough to prove this Supplemental Indenture. The exchange of copies of this Supplemental Indenture and of signature pages by facsimile,
..pdf transmission or other electronic means shall constitute effective execution and delivery of this Supplemental Indenture for all purposes. Signatures of the parties hereto transmitted by facsimile or .pdf transmission or other electronic means
shall be deemed to be their original signatures for all purposes. 
 7.    Effect of Headings. The section
headings herein are for convenience only and shall not affect the construction hereof. 
 8.    The Trustee. The
Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Supplemental Indenture or for or in respect of the recitals contained herein, all of which recitals are made solely by the Company and
the Subsidiary Guarantors. 
 [Signatures on following page] 

 IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly
executed, all as of the date first above written. 
  

			
	KAISER ALUMINUM CORPORATION

 
			
		
	By:	 	 /s/ Neal E. West

	Name:	 	Neal E. West
	Title:	 	Senior Vice President and Chief Financial Officer

 
			
	
	KAISER ALUMINUM INVESTMENTS COMPANY
	KAISER ALUMINUM FABRICATED PRODUCTS, LLC
	KAISER ALUMINUM WASHINGTON, LLC
	as Guarantors

 
			
		
	By:	 	 /s/ Neal E. West

	Name:	 	Neal E. West
	Title:	 	Senior Vice President and Chief Financial Officer

  
 Signature Page to
First Supplemental Indenture 

 
			
	WELLS FARGO BANK, NATIONAL ASSOCIATION
	as Trustee

 
			
		
	By:	 	 /s/ Maddy Hughes

	Name:	 	Maddy Hughes
	Title:	 	Vice President

 Signature Page to First Supplemental IndentureEXHIBIT 4.2
THE TERMS AND CONDITIONS OF THE RIGHTS OFFERING ARE SET FORTH IN THE COMPANY’S PROSPECTUS DATED [•], 2020 (THE “PROSPECTUS”) AND ARE INCORPORATED HEREIN BY REFERENCE. COPIES OF THE PROSPECTUS ARE AVAILABLE UPON REQUEST FROM BROADRIDGE CORPORATE ISSUER SOLUTIONS, INC., THE SUBSCRIPTION AGENT, BY CALLING (888) 789-8409. 
PULSE BIOSCIENCES, INC.
Incorporated under the laws of the State of Delaware
NON-TRANSFERABLE SUBSCRIPTION RIGHTS CERTIFICATE
Evidencing Non-Transferable Subscription Rights to Purchase Units of Pulse Biosciences, Inc.
Subscription Price: To be determined as set forth below
THE SUBSCRIPTION RIGHTS WILL EXPIRE IF NOT EXERCISED ON OR BEFORE
5:00 P.M., EASTERN TIME, ON JUNE 8, 2020 (THE “EXPIRATION DATE”)
REGISTERED OWNER:
THIS CERTIFIES THAT the registered owner whose name is inscribed hereon is the owner of the number of non-transferable subscription rights (“Rights”) set forth above. The Rights entitle the holder thereof to subscribe for and purchase units of Pulse Biosciences, Inc., a Delaware corporation (the “Company”), each unit consisting of one share of common stock, par value $0.001 per share (the “Common Stock”) and 0.15 warrants to purchase shares of Common Stock (the “Units”, and each, a “Unit”), at a subscription price per full Unit equal to the lesser of (i) $7.01 (the “Initial Price”) and (ii) the volume weighted average price of the Common Stock for the five trading day period through and including the Expiration Date (the “Alternate Price”), pursuant to a rights offering (the “Rights Offering”), on the terms and subject to the conditions set forth in the Prospectus. 
Each Right includes a subscription right. Under the subscription right, for each share of common stock owned as of the record date of the Rights Offering, the holder hereof is entitled to purchase [•] Units at the Initial Price per full Unit.
The Rights represented by this Subscription Rights Certificate may be exercised by completing Form 1 and any other appropriate forms on the reverse side hereof and by returning the full payment of the subscription price for each Unit in accordance with the instructions contained herein. If, on the Expiration Date, the Alternate Price is lower than the Initial Price, any excess subscription amounts paid will be put towards the purchase of additional Units (either towards basic subscription rights, if available, or towards the over-subscription right if the basic subscription rights have already been exercised in full). 
This Non-Transferable Subscription Rights Certificate is not valid unless countersigned by Broadridge Corporate Issuer Solutions, Inc., the Subscription Agent. Witness the seal of Pulse Biosciences, Inc. and the signatures of its duly authorized officers.
DATED: [•], 2020
	 
	​	​	 

	President and Chief Executive Officer
	​	​	Secretary

DELIVERY OPTIONS FOR NON-TRANSFERABLE SUBSCRIPTION RIGHTS CERTIFICATE
Deliver other than in the manner or to the addresses listed below will not constitute valid delivery.
	If delivering by hand or overnight courier:
	​	​	If delivering by first class mail:

	 
	​	​	 

	Broadridge Corporate Issuer Solutions, Inc.
Attn: BCIS IWS
51 Mercedes Way
Edgewood, NY 11717
	​	​	Broadridge Corporate Issuer Solutions, Inc.
Attn: BCIS Re-Organization Dept.
P.O. Box 1317
Brentwood, NY 11717-0718

1

PLEASE PRINT ALL INFORMATION CLEARLY AND LEGIBLY.
SECTION 1 – EXERCISE OF SUBSCRIPTION RIGHTS
To subscribe for Units pursuant to your subscription right, please complete lines (a) and (b) and sign in part (c). If you do not indicate the number of Rights being exercised, or if you do not forward the full subscription payment for the number of Rights that you indicate are being exercised, then you will be deemed to have exercised the maximum number of Rights that may be exercised with the aggregate subscription payment you delivered to the Subscription Agent. Fractional Units resulting from the exercise of the subscription rights will be eliminated by rounding down to the nearest whole number, with the total subscription payment being adjusted accordingly. Any excess subscription payments received by the Subscription Agent will be returned, without interest, as soon as practicable. The common stock and warrants comprising the Units will separate upon the closing of the rights offering and will be issued separately, however, they may only be purchased as a Unit and the Unit will not trade as a separate security. Each warrant will be exercisable for one share of Common Stock at an exercise price equivalent to the subscription price through its expiration five years from the date of issuance. The number of warrants issued to you will be calculated by rounding down to the nearest whole number the product computed by multiplying the number of Units you subscribe for by a factor of 0.15. Accordingly, if you purchase fewer than seven Units, you will not receive any warrants.
	(a)

	EXERCISE OF SUBSCRIPTION RIGHT:

	(i)

	Basic Subscription Rights:

	I exercise
	​	​	 
	​	​	x
	​	​	[•]
	​	​	=
	​	​	 
	​	​	x
	​	​	$7.01
	​	​	=
	​	​	$

	 
	​	​	(No. of shares owned) 
	​	​	x
	​	​	(Initial ratio) 
	​	​	 
	​	​	=
	​	​	(No. of Basic Subscription Units Subscribed For) 
	​	​	x
	​	​	(Initial Price) 
	​	​	 
	​	​	(Amount Enclosed)

	(ii)

	Over-Subscription Right: If you fully exercise your Basic Subscription Right, above, and wish to subscribe for additional shares, you may exercise your Over-Subscription Right below.

	I exercise 
	​	​	 
	​	​	x
	​	​	$7.01
	​	​	=
	​	​	$

	 
	​	​	 
	​	​	 
	​	​	 
	​	​	 
	​	​	 

	 
	​	​	(No. of Over-Subscription Units Subscribed For) 
	​	​	x
	​	​	(Initial Price) 
	​	​	=
	​	​	(Amount Enclosed)

	(b)

	PAYMENT:

	 
	​	​	Amount Enclosed
	​	​	 

	Basic Subscription Right:
	​	​	$
	​	​	 ☐ Check or bank draft drawn on a U.S. bank, or postal or express money order payable to Broadridge Corporate Issuer Solutions, Inc., as Subscription Agent.

	​	 
	​
	 
	​	​	 
	​
	Over-Subscription Right:
	​	​	$
	​	​	 ☐ Wire transfer directly to the escrow account maintained by Broadridge Corporate Issuer Solutions, Inc., as Subscription Agent.

	​	 
	​
	 
	​	​	 
	​
	Total Amount Enclosed:
	​	​	$
	​	​	 

	​	 
	​	​	 

Method of Payment: All payments must be made in U.S. dollars by wire transfer of funds, U.S. Postal money order or cashier’s, certified, or uncertified check drawn upon a U.S. bank payable to “Broadridge Corporate Issuer Solutions, Inc. (acting as Subscription Agent for Pulse Biosciences Inc.).” The Subscription Agent will not accept payment by any other means.

2

	(c)

	SIGNATURE(S):

TO SUBSCRIBE: I acknowledge that I have received the Prospectus for the rights offering and I hereby irrevocably subscribe for the number of Units indicated above on the terms and conditions specified in the Prospectus. I hereby agree that if I fail to pay for the Units for which I have subscribed, Pulse Biosciences, Inc. may exercise its legal remedies against me.
This form must be signed by the registered holder(s) exactly as their name(s) appear(s) on the certificate(s) or book entry or by person(s) authorized to sign on behalf of the registered holder(s) by documents transmitted herewith. 
	 
	​	​	 
	​	​	 

	Signature(s) of Subscriber(s)
	​	​	Date
	​	​	Daytime Telephone Number(s)

If signature is by trustee(s), executor(s), administrator(s), guardian(s), attorney(s)-in-fact, agent(s), officer(s) of a corporation or another acting in a fiduciary or representative capacity, please provide the following information (please print). See the instructions.
	 
	​	​	 
	​	​	 
	​	​	 

	Name(s)
	​	​	Full Title
	​	​	Taxpayer ID # or Social Security #
	​	​	Date

3

SECTION 2 – SPECIAL ISSUANCE OR DELIVERY INSTRUCTIONS FOR SUBSCRIPTION RIGHTS HOLDERS
	(a) To be completed ONLY if the book-entry representing the Common Stock is to be issued in a name other than that of the registered holder. (See the Instructions.)
DO NOT FORGET TO COMPLETE THE GUARANTEE OF SIGNATURE(S) SECTION BELOW.
	​	​	 
	​	​	(b) To be completed ONLY if the book-entry representing the Common Stock is to be issued to an address other than that shown on the front of this certificate. (See the Instructions.)
DO NOT FORGET TO COMPLETE THE GUARANTEE OF SIGNATURE(S) SECTION BELOW.

	Print Full Name:
	​	​	 
	​	​	 
	​	​	Print Full Name:
	​	​	 

	Print Full Address:
	​	​	 
	​	​	 
	​	​	Print Full Address:
	​	​	 

	Taxpayer ID # or 
Social Security #:
	​	​	 
	​	​	 
	​	​	Taxpayer ID # or 
Social Security #:
	​	​	 

SIGNATURE GUARANTEE
This must be completed if you have completed any portion of Section 2.
	Signature Guaranteed:
	​	​	 
	​	​	 

	 
	​	​	(Name of Bank or Form)
	​	​	 

	By:
	​	​	 
	​	​	 

	 
	​	​	  (Signature of Officer)
	​	​	 

IMPORTANT: The signature(s) should be guaranteed by an eligible guarantor institution (bank, stock broker, savings & loan association or credit union) with membership in an approved signature guarantee medallion program pursuant to Securities and Exchange Commission Rule 17Ad-15.
FOR INSTRUCTIONS ON THE USE OF NON-TRANSFERABLE SUBSCRIPTION RIGHTS CERTIFICATES, CONSULT BROADRIDGE CORPORATE ISSUER SOLUTIONS, INC., THE SUBSCRIPTION AGENT, AT (888)-789-8409 (TOLL-FREE). THE RIGHTS OFFERING EXPIRES AT 5:00 P.M., EASTERN TIME, ON JUNE 8, 2020, AND THIS NON-TRANSFERABLE SUBSCRIPTION RIGHTS CERTIFICATE IS VOID THEREAFTER.
THE RIGHTS OFFERING HAS BEEN REGISTERED OR QUALIFIED OR IS BELIEVED TO BE EXEMPT FROM REGISTRATION OR QUALIFICATION ONLY UNDER THE FEDERAL LAWS OF THE UNITED STATES AND THE LAWS OF THE STATES IN THE UNITED STATES. RESIDENTS OF OTHER JURISDICTIONS MAY NOT PURCHASE THE SECURITIES OFFERED HEREBY UNLESS THEY CERTIFY THAT THEIR PURCHASES OF SUCH SECURITIES ARE EFFECTED IN ACCORDANCE WITH THE APPLICABLE LAWS OF SUCH JURISDICTIONS.

4

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