Form of Medium-Term Notes, Series K





 Exhibit 4.2 

[Face of Note] 

Unless this certificate is presented by an authorized representative of The Depository Trust Company, a New York corporation
(“DTC”), to the Company or its agent for registration of transfer, exchange or payment, and any certificate issued is registered in the name of Cede & Co. or in such other name as requested by an authorized representative
of DTC (and any payment is made to Cede & Co. or such other entity as is requested by an authorized representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the
registered owner hereof, Cede & Co., has an interest herein. 
  

	 CUSIP NO. 95000E4A4 
	 FACE AMOUNT: $                



 REGISTERED NO.      

WELLS FARGO & COMPANY 

MEDIUM-TERM NOTE, SERIES K 

Due Nine Months or More From Date of Issue 

Principal at Risk Securities Linked to the Lowest Performing of the 

S&P 500® Index, the Russell
2000® Index and 
 the EURO STOXX 50® Index due December 6, 2021 
 WELLS FARGO & COMPANY,
a corporation duly organized and existing under the laws of the State of Delaware (hereinafter called the “Company,” which term includes any successor corporation under the Indenture hereinafter referred to), for value received,
hereby promises to pay to CEDE & Co., or registered assigns, an amount equal to the Redemption Amount (as defined below) on the Stated Maturity Date (as defined below), unless this Security is automatically called prior to the Stated
Maturity Date as provided below under “Automatic Call,” and to pay Contingent Coupon Payments (as defined below) on the Face Amount of this Security to the extent provided herein on the Contingent Coupon Payment Dates specified herein at
the Contingent Coupon Rate (as defined below) until the earlier of the Stated Maturity Date and the Call Settlement Date (as defined below), if any. The “Initial Stated Maturity Date” shall be December 6, 2021. If the Final
Calculation Day (as defined below) is not postponed, the Initial Stated Maturity Date will be the “Stated Maturity Date.” If the Final Calculation Day is postponed, the “Stated Maturity Date” shall be the later of
(i) the Initial Stated Maturity Date and (ii) the third Business Day (as defined below) after the last Final Calculation Day as postponed. 

“Face Amount” shall mean, when used with respect to this Security, the amount set forth on the face of this
Security as its “Face Amount.” 









 Automatic Call 

If the Closing Level (as defined below) of the Lowest Performing Index (as defined below) on any of the quarterly Calculation
Days (as defined below) from June 2018 to September 2021, inclusive, is greater than or equal to its Starting Level (as defined below), this Security will be automatically called by the Company, and on the related Call Settlement Date the Holder
hereof will receive the Call Price (as defined below) plus a final Contingent Coupon Payment. Unless the Company defaults in the payment of the Call Price plus the final Contingent Coupon Payment, this Security will cease to be outstanding on such
Call Settlement Date, no additional Contingent Coupon Payments will be payable on this Security and the Holder hereof will have no further rights under this Security after such Call Settlement Date. The Holder hereof will not receive any notice from
the Company in the event this Security is automatically called pursuant to the terms hereof. The “Call Price” is equal to the Face Amount of this Security. The “Call Settlement Date” for a Calculation Day shall be
three Business Days after such Calculation Day, as such Calculation Day may be postponed as provided herein. If a Calculation Day is postponed with respect to one or more Indices, the related Call Settlement Date will be three Business Days after
the last Calculation Day as postponed. 
 Payment of Contingent Coupon Payments, the Redemption Amount and the Call Price 

On each quarterly Contingent Coupon Payment Date, the Company shall pay a Contingent Coupon Payment if, and only if, the
Closing Level of the Lowest Performing Index on the related Calculation Day is greater than or equal to its Threshold Level (as defined below). A “Contingent Coupon Payment,” if payable as provided herein, shall be equal to the
product of (i) the Face Amount of this Security, (ii) the Contingent Coupon Rate, and (iii) 90/360. The “Contingent Coupon Payment Dates” shall be the third Business Day following each Calculation Day, as each such
Calculation Day may be postponed as herein provided, provided that the Contingent Coupon Payment Date with respect to the Final Calculation Day will be the Stated Maturity Date. If a Calculation Day is postponed with respect to one or more Indices,
the related Contingent Coupon Payment Date will be three Business Days after the last Calculation Day as postponed. The “Contingent Coupon Rate” is 7.65% per annum. Any Contingent Coupon Payments will be rounded to the nearest cent,
with one-half cent rounded upward. 
 Any Contingent Coupon Payment so payable, and
punctually paid or duly provided for, on any Contingent Coupon Payment Date will, as provided in the Indenture, be paid to the Person in whose name this Security (or one or more Predecessor Securities) is registered at the close of business on the
Regular Record Date for such Contingent Coupon Payment next preceding such Contingent Coupon Payment Date. The Regular Record Date for a Contingent Coupon Payment Date shall be the date one Business Day prior to such Contingent Coupon Payment Date.

 Any Contingent Coupon Payment not punctually paid or duly provided for will forthwith cease to be payable to the Holder
on such Regular Record Date and may either be paid to the Person in whose name this Security (or one or more Predecessor Securities) is registered at the close of business on a Special Record Date for the payment of such Defaulted Interest to be
fixed by the Trustee, notice whereof shall be given to Holders of Securities of this series not less than 10 days prior to such Special Record Date, or be paid at any time in any other lawful manner not inconsistent with the requirements of any
securities exchange on which the Securities of this series 

  
 2 










 
may be listed, and upon such notice as may be required by such exchange, all as more fully provided in the Indenture. 

Payment of any Contingent Coupon Payment on this Security will be made in immediately available funds at the office or agency
of the Company maintained for that purpose in the City of Minneapolis, Minnesota; provided, however, that, at the option of the Company, payment of any Contingent Coupon Payment may be paid by check mailed to the Person entitled thereto at such
Person’s last address as it appears in the Security Register or by wire transfer to such account as may have been designated by such Person. Payments of any Contingent Coupon Payment and the Redemption Amount or the Call Price, as applicable,
on this Security at Maturity will be made against presentation of this Security at the office or agency of the Company maintained for that purpose in the City of Minneapolis, Minnesota and at any other office or agency maintained by the Company for
such purpose. Notwithstanding the foregoing, for so long as this Security is a Global Security registered in the name of the Depositary, any payments on this Security will be made to the Depositary by wire transfer of immediately available funds.

 Payment of the Redemption Amount or the Call Price, as applicable, and any Contingent Coupon Payments on this Security
will be made in such coin or currency of the United States of America as at the time of payment is legal tender for payment of public and private debts. 

Definitions Relating to Redemption Amount, the Call Price and Contingent Coupon Payments 

If this Security is not automatically called prior to the Stated Maturity Date as provided above under “Automatic
Call,” the “Redemption Amount” of this Security will equal: 
  

	 	•	 	 if the Ending Level of the Lowest Performing Index on the Final Calculation Day (as defined below) is greater
than or equal to its Threshold Level: the Face Amount; or 


  

	 	•	 	 if the Ending Level of the Lowest Performing Index on the Final Calculation Day is less than its Threshold
Level: 


  

																											
		 		 		 		 		 		 		 		 		 		 		 		 		 	
		 		 		 		 	 	 	Face Amount	 	  x        	 	Performance Factor of the Lowest Performing	 	 	 		 		 		 		 	
		 		 		 		 	 	 	 	 	Index on the Final Calculation Day	 	 	 		 		 		 		 	

 All calculations with respect to the Redemption Amount will be rounded to the nearest one hundred-thousandth,
with five one-millionths rounded upward (e.g., 0.000005 would be rounded to 0.00001); and the Redemption Amount will be rounded to the nearest cent, with one-half cent
rounded upward. 
 “Index” shall mean each of the S&P 500 Index, the Russell 2000 Index and the EURO
STOXX 50 Index. 
 The “Pricing Date” shall mean November 29, 2017. 

  
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 The “Lowest Performing Index” for any Calculation Day will
be the Index with the lowest Performance Factor on that Calculation Day (as such Calculation Day may be postponed for one or more Indices as provided herein). 

The “Performance Factor” with respect to an Index on any Calculation Day is its Closing Level on such
Calculation Day divided by its Starting Level (expressed as a percentage). 
 The “Starting Level” with
respect to the S&P 500 Index is 2626.07, its Closing Level on the Pricing Date, with respect to the Russell 2000 Index is 1542.297, its Closing Level on the Pricing Date, and with respect to the EURO STOXX 50 Index is 3589.91, its Closing Level
on the Pricing Date. 
 The “Ending Level” of an Index will be its Closing Level on the Final Calculation
Day. 
 The “Threshold Level” with respect to the S&P 500 Index is 1838.249, which is equal to 70% of
its Starting Level, with respect to the Russell 2000 Index is 1079.6079, which is equal to 70% of its Starting Level, and with respect to the EURO STOXX 50 Index is 2512.937, which is equal to 70% of its Starting Level. 

The “Closing Level” with respect to each Index on any Trading Day means the official closing level of that
Index reported by the relevant Index Sponsor on such Trading Day, as obtained by the Calculation Agent on such Trading Day from the licensed third-party market data vendor contracted by the Calculation Agent at such time; in particular, taking into
account the decimal precision and/or rounding convention employed by such licensed third-party market data vendor on such date, subject to the provisions set forth below under “—Market Disruption Events” and “—Discontinuance
of an Index; Alteration of Method of Calculation.” 
 “Index Sponsor” shall mean the sponsor or
publisher of an Index. 
 “Business Day” shall mean a day, other than a Saturday or Sunday, that is neither
a legal holiday nor a day on which banking institutions are authorized or required by law or regulation to close in New York, New York. 

The “Calculation Days” shall be the 1st day of each
March, June, September and December, commencing March 2018 and ending September 2021, and the Final Calculation Day. If any such day is not a Trading Day with respect to any Index, such Calculation Day for each Index will be postponed to the next
succeeding day that is a Trading Day with respect to each Index. A Calculation Day for an Index is also subject to postponement due to the occurrence of a Market Disruption Event (as defined below) with respect to such Index on such Calculation Day.
The “Final Calculation Day” is December 1, 2021. If a Market Disruption Event occurs or is continuing with respect to an Index on any Calculation Day, then such Calculation Day for such Index will be postponed to the first
succeeding Trading Day for such Index on which a Market Disruption Event for such Index has not occurred and is not continuing; however, if such first succeeding Trading Day has not occurred as of the eighth Trading Day for such Index after the
originally scheduled Calculation Day, that eighth Trading Day shall be deemed to be the Calculation Day for such Index. If a Calculation Day has been postponed eight Trading Days for an Index after the originally scheduled Calculation Day and a
Market Disruption Event occurs or is continuing with respect to such Index on such eighth Trading Day, 

  
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the Calculation Agent will determine the Closing Level of such Index on such eighth Trading Day in accordance with the formula for and method of calculating the Closing Level of such Index last
in effect prior to commencement of the Market Disruption Event, using the closing price (or, with respect to any relevant security, if a Market Disruption Event has occurred with respect to such security, its good faith estimate of the value of such
security at (i) with respect to the S&P 500 Index or the Russell 2000 Index, the Scheduled Closing Time of the Relevant Stock Exchange for such security or, if earlier, the actual closing time of the regular trading session of such Relevant
Stock Exchange or (ii) with respect to the EURO STOXX 50 Index, the time at which the official Closing Level of such Index is calculated and published by the relevant Index Sponsor) on such date of each security included in such Index. As used
herein, “closing price” means, with respect to any security on any date, the Relevant Stock Exchange traded or quoted price of such security as of (i) with respect to the S&P 500 Index or the Russell 2000 Index, the
Scheduled Closing Time of the Relevant Stock Exchange for such security or, if earlier, the actual closing time of the regular trading session of such Relevant Stock Exchange or (ii) with respect to the EURO STOXX 50 Index, the time at which
the official Closing Level of such Index is calculated and published by the relevant Index Sponsor. Notwithstanding the postponement of a Calculation Day for an Index due to a Market Disruption Event with respect to such Index on such Calculation
Day, the originally scheduled Calculation Day will remain the Calculation Day for any Index not affected by a Market Disruption Event on such day. 

“Calculation Agent Agreement” shall mean the Calculation Agent Agreement dated as of March 18, 2015
between the Company and the Calculation Agent, as amended from time to time. 
 “Calculation Agent” shall
mean the Person that has entered into the Calculation Agent Agreement with the Company providing for, among other things, the determination of whether this Security will be automatically called prior to stated maturity and whether a Contingent
Coupon Payment will be made, the Call Price, if any, and the Redemption Amount, if any, which term shall, unless the context otherwise requires, include its successors under such Calculation Agent Agreement. The initial Calculation Agent shall be
Wells Fargo Securities, LLC. Pursuant to the Calculation Agent Agreement, the Company may appoint a different Calculation Agent from time to time after the initial issuance of this Security without the consent of the Holder of this Security and
without notifying the Holder of this Security. 
 Certain Definitions 

A “Trading Day” with respect to the S&P 500 Index or the Russell 2000 Index means a day, as determined by
the Calculation Agent, on which (i) the Relevant Stock Exchanges with respect to each security underlying such Index are scheduled to be open for trading for their respective regular trading sessions and (ii) each Related Futures or
Options Exchange is scheduled to be open for trading for its regular trading session. 
 A “Trading Day”
with respect to the EURO STOXX 50 Index means a day, as determined by the Calculation Agent, on which (i) the relevant Index Sponsor is scheduled to publish the level of the EURO STOXX 50 Index and (ii) each Related Futures or Options
Exchange is scheduled to be open for trading for its regular trading session. 

  
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 The “Relevant Stock Exchange” for any security underlying
an Index means the primary exchange or quotation system on which such security is traded, as determined by the Calculation Agent. 

The “Related Futures or Options Exchange” for an Index means an exchange or quotation system where trading
has a material effect (as determined by the Calculation Agent) on the overall market for futures or options contracts relating to such Index. 

Discontinuance Of An Index; Alteration Of Method Of Calculation 

If an Index Sponsor discontinues publication of an Index, and such Index Sponsor or another entity publishes a successor or
substitute equity index that the Calculation Agent determines, in its sole discretion, to be comparable to such Index (a “Successor Equity Index”), then, upon the Calculation Agent’s notification of that determination to the
Trustee and the Company, the Calculation Agent will substitute the Successor Equity Index as calculated by the relevant Index Sponsor or any other entity for purposes of calculating the Closing Level of such Index on any date of determination. Upon
any selection by the Calculation Agent of a Successor Equity Index, the Company will cause notice to be given to the Holder of this Security. 

In the event that an Index Sponsor discontinues publication of an Index prior to, and the discontinuance is continuing on, a
Calculation Day and the Calculation Agent determines that no Successor Equity Index is available at such time, the Calculation Agent will calculate a substitute Closing Level for such Index in accordance with the formula for and method of
calculating such Index last in effect prior to the discontinuance, but using only those securities that comprised such Index immediately prior to that discontinuance. If a Successor Equity Index is selected or the Calculation Agent calculates a
level as a substitute for such Index, the Successor Equity Index or level will be used as a substitute for such Index for all purposes, including the purpose of determining whether a Market Disruption Event exists. 

If on a Calculation Day an Index Sponsor fails to calculate and announce the level of an Index, the Calculation Agent will
calculate a substitute Closing Level of such Index in accordance with the formula for and method of calculating such Index last in effect prior to the failure, but using only those securities that comprised such Index immediately prior to that
failure; provided that, if a Market Disruption Event occurs or is continuing on such day with respect to such Index, then the provisions set forth above under the definition of “Calculation Days” shall apply in lieu of the
foregoing. 
 If at any time the relevant Index Sponsor makes a material change in the formula for or the method of
calculating an Index, or in any other way materially modifies such Index (other than a modification prescribed in that formula or method to maintain such Index in the event of changes in constituent stock and capitalization and other routine
events), then, from and after that time, the Calculation Agent will, at the close of business in New York, New York, on each date that the Closing Level of such Index is to be calculated, calculate a substitute Closing Level of such Index in
accordance with the formula for and method of calculating such Index last in effect prior to the change, but using only those securities that comprised such Index immediately prior to that change. Accordingly, if the method of calculating an Index
is modified so that the level of such Index is a fraction or a multiple of what it would have been if it had not been modified, 

  
 6 










 
then the Calculation Agent will adjust such Index in order to arrive at a level of such Index as if it had not been modified. 

Market Disruption Events 

A “Market Disruption Event” with respect to the S&P 500 Index or the Russell 2000 Index means any of the
following events as determined by the Calculation Agent in its sole discretion: 
  

	 	(A)	 The occurrence or existence of a material suspension of or limitation imposed on trading by the Relevant Stock
Exchanges or otherwise relating to securities which then comprise 20% or more of the level of such Index or any Successor Equity Index at any time during the one-hour period that ends at the Close of Trading
on that day, whether by reason of movements in price exceeding limits permitted by those Relevant Stock Exchanges or otherwise. 


  

	 	(B)	 The occurrence or existence of a material suspension of or limitation imposed on trading by any Related
Futures or Options Exchange or otherwise in futures or options contracts relating to such Index or any Successor Equity Index on any Related Futures or Options Exchange at any time during the one-hour period
that ends at the Close of Trading on that day, whether by reason of movements in price exceeding limits permitted by the Related Futures or Options Exchange or otherwise. 



 

	 	(C)	 The occurrence or existence of any event, other than an early closure, that materially disrupts or impairs the
ability of market participants in general to effect transactions in, or obtain market values for, securities that then comprise 20% or more of the level of such Index or any Successor Equity Index on their Relevant Stock Exchanges at any time during
the one-hour period that ends at the Close of Trading on that day. 


  

	 	(D)	 The occurrence or existence of any event, other than an early closure, that materially disrupts or impairs the
ability of market participants in general to effect transactions in, or obtain market values for, futures or options contracts relating to such Index or any Successor Equity Index on any Related Futures or Options Exchange at any time during the one-hour period that ends at the Close of Trading on that day. 


  

	 	(E)	 The closure on any Exchange Business Day of the Relevant Stock Exchanges on which securities that then
comprise 20% or more of the level of such Index or any Successor Equity Index are traded or any Related Futures or Options Exchange with respect to such Index or any Successor Equity Index prior to its Scheduled Closing Time unless the earlier
closing time is announced by the Relevant Stock Exchange or Related Futures or Options Exchange, as applicable, at least one hour prior to the earlier of (1) the actual closing time for the regular trading session on such Relevant Stock
Exchange or Related Futures or Options Exchange, as applicable, and (2) the submission deadline for orders to be entered 



  
 7 











	 	 
into the Relevant Stock Exchange or Related Futures or Options Exchange, as applicable, system for execution at such actual closing time on that day. 



 

	 	(F)	 The Relevant Stock Exchange for any security underlying such Index or Successor Equity Index or any Related
Futures or Options Exchange with respect to such Index or Successor Equity Index fails to open for trading during its regular trading session. 



For purposes of determining whether a Market Disruption Event has occurred with respect to the S&P 500 Index or the
Russell 2000 Index: 
  

	 	(1)	 the relevant percentage contribution of a security to the level of such Index or any Successor Equity Index
will be based on a comparison of (x) the portion of the level of such Index attributable to that security and (y) the overall level of such Index or Successor Equity Index, in each case immediately before the occurrence of the Market
Disruption Event; 


  

	 	(2)	 the “Close of Trading” on any Trading Day for such Index or any Successor Equity Index means
the Scheduled Closing Time of the Relevant Stock Exchanges with respect to the securities underlying such Index or Successor Equity Index on such Trading Day; provided that, if the actual closing time of the regular trading session of any such
Relevant Stock Exchange is earlier than its Scheduled Closing Time on such Trading Day, then (x) for purposes of clauses (A) and (C) of the definition of “Market Disruption Event” above, with respect to any security underlying
such Index or Successor Equity Index for which such Relevant Stock Exchange is its Relevant Stock Exchange, the “Close of Trading” means such actual closing time and (y) for purposes of clauses (B) and (D) of the definition of
“Market Disruption Event” above, with respect to any futures or options contract relating to such Index or Successor Equity Index, the “Close of Trading” means the latest actual closing time of the regular trading session of any
of the Relevant Stock Exchanges, but in no event later than the Scheduled Closing Time of the Relevant Stock Exchanges; 


  

	 	(3)	 the “Scheduled Closing Time” of any Relevant Stock Exchange or Related Futures or Options
Exchange on any Trading Day for such Index or any Successor Equity Index means the scheduled weekday closing time of such Relevant Stock Exchange or Related Futures or Options Exchange on such Trading Day, without regard to after hours or any other
trading outside the regular trading session hours; and 


  

	 	(4)	 an “Exchange Business Day” means any Trading Day for such Index or any Successor Equity Index
on which each Relevant Stock Exchange for the securities underlying such Index or any Successor Equity Index and each Related Futures or Options Exchange with respect to such Index or any Successor Equity Index are open for trading during their
respective regular trading sessions, notwithstanding any such Relevant Stock Exchange or Related Futures or Options Exchange closing prior to its Scheduled Closing Time. 



  
 8 










 A “Market Disruption Event” with respect to the EURO STOXX
50 Index means any of (A), (B), (C) or (D) below, as determined by the Calculation Agent in its sole discretion: 
  

	 	(A)	 Any of the following events occurs or exists with respect to any security included in such Index or any
Successor Equity Index, and the aggregate of all securities included in such Index or Successor Equity Index with respect to which any such event occurs comprise 20% or more of the level of such Index or Successor Equity Index;



  

	 	•	 	 a material suspension of or limitation imposed on trading by the Relevant Stock Exchange for such security or
otherwise at any time during the one-hour period that ends at the Scheduled Closing Time for the Relevant Stock Exchange for such security on that day, whether by reason of movements in price exceeding limits
permitted by the Relevant Stock Exchange or otherwise; 


  

	 	•	 	 any event, other than an early closure, that materially disrupts or impairs the ability of market participants
in general to effect transactions in, or obtain market values for, such security on its Relevant Stock Exchange at any time during the one-hour period that ends at the Scheduled Closing Time for the Relevant
Stock Exchange for such security on that day; or 


  

	 	•	 	 the closure on any Exchange Business Day of the Relevant Stock Exchange for such security prior to its
Scheduled Closing Time unless the earlier closing is announced by such Relevant Stock Exchange at least one hour prior to the earlier of (i) the actual closing time for the regular trading session on such Relevant Stock Exchange and
(ii) the submission deadline for orders to be entered into the Relevant Stock Exchange system for execution at the Scheduled Closing Time for such Relevant Stock Exchange on that day. 



 

	 	(B)	 Any of the following events occurs or exists with respect to futures or options contracts relating to such
Index or any Successor Equity Index: 


  

	 	•	 	 a material suspension of or limitation imposed on trading by any Related Futures or Options Exchange or
otherwise at any time during the one-hour period that ends at the close of trading on such Related Futures or Options Exchange on that day, whether by reason of movements in price exceeding limits permitted by
the Related Futures or Options Exchange or otherwise; 


  

	 	•	 	 any event, other than an early closure, that materially disrupts or impairs the ability of market participants
in general to effect transactions in, or obtain market values for, futures or options contracts relating to such Index or Successor Equity Index on any Related Futures or Options Exchange at any time during the
one-hour period that ends at the close of trading on such Related Futures or Options Exchange on that day; or 



  
 9 











	 	•	 	 the closure on any Exchange Business Day of any Related Futures or Options Exchange prior to its Scheduled
Closing Time unless the earlier closing time is announced by such Related Futures or Options Exchange at least one hour prior to the earlier of (i) the actual closing time for the regular trading session on such Related Futures or Options
Exchange and (ii) the submission deadline for orders to be entered into the Related Futures or Options Exchange system for execution at the close of trading for such Related Futures or Options Exchange on that day. 



 

	 	(C)	 The relevant Index Sponsor fails to publish the level of such Index or any Successor Equity Index (other than
as a result of the relevant Index Sponsor having discontinued publication of such Index or Successor Equity Index and no Successor Equity Index being available). 



 

	 	(D)	 Any Related Futures or Options Exchange fails to open for trading during its regular trading session.



 For purposes of determining whether a Market Disruption Event has occurred with respect
to the EURO STOXX 50 Index: 
  

	 	(1)	 the relevant percentage contribution of a security included in such Index or any Successor Equity Index to the
level of such Index will be based on a comparison of (x) the portion of the level of such index attributable to that security to (y) the overall level of such index, in each case using the official opening weightings as published by the
relevant Index Sponsor as part of the market opening data; 


  

	 	(2)	 the “Scheduled Closing Time” of any Relevant Stock Exchange or Related Futures or Options
Exchange on any Trading Day means the scheduled weekday closing time of such Relevant Stock Exchange or Related Futures or Options Exchange on such Trading Day, without regard to after hours or any other trading outside the regular trading session
hours; and 


  

	 	(3)	 an “Exchange Business Day” means any Trading Day on which (i) the relevant Index Sponsor
publishes the level of such Index or any Successor Equity Index and (ii) each Related Futures or Options Exchange is open for trading during its regular trading session, notwithstanding any Related Futures or Options Exchange closing prior to
its Scheduled Closing Time. 


 Calculation Agent 

The Calculation Agent will determine whether this Security will be automatically called prior to stated maturity and whether a
Contingent Coupon Payment will be made, the Call Price, if any, and the Redemption Amount, if any. In addition, the Calculation Agent will (i) determine if adjustments are required to the Closing Level of an Index under the circumstances
described in this Security, (ii) if publication of an Index is discontinued, select a Successor Equity Index or, if no Successor Equity Index is available, determine the Closing Level of such Index under the


  
 10 










 
circumstances described in this Security, and (iii) determine whether a Market Disruption Event has occurred. 

The Company covenants that, so long as this Security is Outstanding, there shall at all times be a Calculation Agent (which
shall be a broker-dealer, bank or other financial institution) with respect to this Security. 

All determinations made by the Calculation Agent with respect to this Security will be at the sole discretion of the
Calculation Agent and, in the absence of manifest error, will be conclusive for all purposes and binding on the Company and the Holder of this Security. 

Redemption and Repayment 

This Security is not subject to repayment at the option of the Holder hereof prior to December 6, 2021. Except as set
forth above under “Automatic Call,” this Security is not subject to redemption prior to December 6, 2021. This Security is not entitled to any sinking fund. 

Acceleration 
 If
an Event of Default, as defined in the Indenture, with respect to this Security shall occur and be continuing, the Redemption Amount (calculated as set forth in the next two sentences) of this Security may be declared due and payable in the manner
and with the effect provided in the Indenture. The amount payable to the Holder hereof upon any acceleration permitted under the Indenture will be equal to the Redemption Amount hereof calculated as provided herein, plus a portion of a final
Contingent Coupon Payment, if any. The Redemption Amount and any final Contingent Coupon Payment will be calculated as though the date of acceleration were the Final Calculation Day. The final Contingent Coupon Payment, if any, will be prorated from
and including the immediately preceding Contingent Coupon Payment Date to but excluding the date of acceleration. 
  

 

Reference is hereby made to the further provisions of this Security set forth on the reverse hereof, which further provisions
shall for all purposes have the same effect as if set forth at this place. 
 Unless the certificate of authentication
hereon has been executed by the Trustee referred to on the reverse hereof by manual signature or its duly authorized agent under the Indenture referred to on the reverse hereof by manual signature, this Security shall not be entitled to any benefit
under the Indenture or be valid or obligatory for any purpose. 
 [The remainder of this page has been left intentionally blank] 

  
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 IN WITNESS WHEREOF, the Company has caused this instrument to be duly
executed under its corporate seal. 
 DATED: 
  

					
	WELLS FARGO & COMPANY
		
	By:	 	 
			
		 	Its:	 	


 [SEAL] 
  

					
	Attest:	 	 
			
		 	Its:	 	


  

			
	 TRUSTEE’S CERTIFICATE OF

AUTHENTICATION
 This is one of the Securities of the

series designated therein described
 in the within-mentioned Indenture.

	
	 CITIBANK, N.A.,

      as Trustee

		
	By:	 	 
		 	Authorized Signature
	
	OR
	
	 WELLS FARGO BANK, N.A.,

  as Authenticating Agent for the Trustee

		
	By:	 	 
		 	Authorized Signature


  
 12 










 [Reverse of Note] 

WELLS FARGO & COMPANY 

MEDIUM-TERM NOTE, SERIES K 

Due Nine Months or More From Date of Issue 

Principal at Risk Securities Linked to the Lowest Performing of the 

S&P 500® Index, the Russell
2000® Index and 
 the EURO STOXX 50® Index due December 6, 2021 
 This Security is one of a duly
authorized issue of securities of the Company (herein called the “Securities”), issued and to be issued in one or more series under an indenture dated as of July 21, 1999, as amended or supplemented from time to time (herein
called the “Indenture”), between the Company and Citibank, N.A., as Trustee (herein called the “Trustee,” which term includes any successor trustee under the Indenture), to which Indenture and all indentures
supplemental thereto reference is hereby made for a statement of the respective rights, limitations of rights, duties and immunities thereunder of the Company, the Trustee and the Holders of the Securities, and of the terms upon which the Securities
are, and are to be, authenticated and delivered. This Security is one of the series of the Securities designated as Medium-Term Notes, Series K, of the Company, which series is limited to an aggregate principal amount or face amount, as applicable,
of $25,000,000,000 or the equivalent thereof in one or more foreign or composite currencies. The amount payable on the Securities of this series may be determined by reference to the performance of one or more equity-, commodity- or currency-based
indices, exchange traded funds, securities, commodities, currencies, statistical measures of economic or financial performance, or a basket comprised of two or more of the foregoing, or any other market measure or may bear interest at a fixed rate
or a floating rate. The Securities of this series may mature at different times, be redeemable at different times or not at all, be repayable at the option of the Holder at different times or not at all and be denominated in different currencies.

 Article Sixteen of the Indenture shall not apply to this Security. 

The Securities are issuable only in registered form without coupons and will be either
(a) book-entry securities represented by one or more Global Securities recorded in the book-entry system maintained by the Depositary or (b) certificated
securities issued to and registered in the names of, the beneficial owners or their nominees. 
 The Company agrees, to the
extent permitted by law, not to voluntarily claim the benefits of any laws concerning usurious rates of interest against a Holder of this Security. 

Modification and Waivers 

The Indenture permits, with certain exceptions as therein provided, the amendment thereof and the modification of the rights
and obligations of the Company and the rights of the Holders of the Securities of each series to be affected under the Indenture at any time by the Company and the 

  
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Trustee with the consent of the Holders of a majority in principal amount of the Securities at the time Outstanding of all series to be affected, acting together as a class. The Indenture also
contains provisions permitting the Holders of a majority in principal amount of the Securities of all series at the time Outstanding affected by certain provisions of the Indenture, acting together as a class, on behalf of the Holders of all
Securities of such series, to waive compliance by the Company with those provisions of the Indenture. Certain past defaults under the Indenture and their consequences may be waived under the Indenture by the Holders of a majority in principal amount
of the Securities of each series at the time Outstanding, on behalf of the Holders of all Securities of such series. Solely for the purpose of determining whether any consent, waiver, notice or other action or Act to be taken or given by the Holders
of Securities pursuant to the Indenture has been given or taken by the Holders of Outstanding Securities in the requisite aggregate principal amount, the principal amount of this Security will be deemed to be equal to the amount set forth on the
face hereof as the “Face Amount” hereof. Any such consent or waiver by the Holder of this Security shall be conclusive and binding upon such Holder and upon all future Holders of this Security and of any Security issued upon the
registration of transfer hereof or in exchange herefor or in lieu hereof, whether or not notation of such consent or waiver is made upon this Security. 

Defeasance 

Section 403 and Article Fifteen of the Indenture and the provisions of clause (ii) of Section 401(1)(B) of the
Indenture, relating to defeasance at any time of (a) the entire indebtedness on this Security and (b) certain restrictive covenants and certain Events of Default, upon compliance by the Company with certain conditions set forth therein,
shall not apply to this Security. The remaining provisions of Section 401 of the Indenture shall apply to this Security. 
 Authorized
Denominations 
 This Security is issuable only in registered form without coupons in denominations of $1,000 or any
amount in excess thereof which is an integral multiple of $1,000. 
 Registration of Transfer 

Upon due presentment for registration of transfer of this Security at the office or agency of the Company in the City of
Minneapolis, Minnesota, a new Security or Securities of this series, with the same terms as this Security, in authorized denominations for an equal aggregate Face Amount will be issued to the transferee in exchange herefor, as provided in the
Indenture and subject to the limitations provided therein and to the limitations described below, without charge except for any tax or other governmental charge imposed in connection therewith. 

This Security is exchangeable for definitive Securities in registered form only if (x) the Depositary notifies the
Company that it is unwilling or unable to continue as Depositary for this Security or if at any time the Depositary ceases to be a clearing agency registered under the Securities Exchange Act of 1934, as amended, and a successor depositary is not
appointed within 90 days after the Company receives such notice or becomes aware of such ineligibility, (y) the Company in its sole discretion determines that this Security shall be exchangeable for definitive Securities in registered form
and notifies the Trustee thereof or (z) an Event of Default with respect to the Securities represented hereby has occurred and is continuing. If this Security is exchangeable 

  
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pursuant to the preceding sentence, it shall be exchangeable for definitive Securities in registered form, bearing interest at the same rate, having the same date of issuance, Stated Maturity
Date and other terms and of authorized denominations aggregating a like amount. 
 This Security may not be transferred
except as a whole by the Depositary to a nominee of the Depositary or by a nominee of the Depositary to the Depositary or another nominee of the Depositary or by the Depositary or any such nominee to a successor of the Depositary or a nominee of
such successor. Except as provided above, owners of beneficial interests in this Global Security will not be entitled to receive physical delivery of Securities in definitive form and will not be considered the Holders hereof for any purpose under
the Indenture. 
 Prior to due presentment of this Security for registration of transfer, the Company, the Trustee and any
agent of the Company or the Trustee may treat the Person in whose name this Security is registered as the owner hereof for all purposes, whether or not this Security be overdue, and neither the Company, the Trustee nor any such agent shall be
affected by notice to the contrary. 
 Obligation of the Company Absolute 

No reference herein to the Indenture and no provision of this Security or the Indenture shall alter or impair the obligation
of the Company, which is absolute and unconditional, to pay the Contingent Coupon Payments, if any, and the Redemption Amount or the Call Price, as applicable, on this Security at the times, place and rate, and in the coin or currency, herein
prescribed, except as otherwise provided in this Security. 
 No Personal Recourse 

No recourse shall be had for the payment of any Contingent Coupon Payments or the Redemption Amount or the Call Price, as
applicable, on this Security or for any claim based hereon, or otherwise in respect hereof, or based on or in respect of the Indenture or any indenture supplemental thereto, against any incorporator, stockholder, officer or director, as such, past,
present or future, of the Company or any successor corporation, whether by virtue of any constitution, statute or rule of law, or by the enforcement of any assessment or penalty or otherwise, all such liability being, by the acceptance hereof and as
part of the consideration for the issuance hereof, expressly waived and released. 
 Defined Terms 

All terms used in this Security which are defined in the Indenture shall have the meanings assigned to them in the Indenture
unless otherwise defined in this Security. 
 Governing Law 

This Security shall be governed by and construed in accordance with the law of the State of New York, without regard to
principles of conflicts of laws. 

  
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 ABBREVIATIONS 

The following abbreviations, when used in the inscription on the face of this instrument, shall be construed as though they
were written out in full according to applicable laws or regulations: 
  

					
	 TEN COM
	 	  -- 
	 	 as tenants in common

			
	 TEN ENT
	 	  -- 
	 	 as tenants by the entireties

			
	 JT TEN
	 	  -- 
	 	 as joint tenants with right

of survivorship and not
 as
tenants in common


  

							
	 UNIF GIFT MIN ACT -- 
	 	 	 	 Custodian
	 	 
		 	(Cust)	 		 	(Minor)

  

	
	Under Uniform Gifts to Minors Act
	
	   

	(State)

 Additional abbreviations may also be used though not in the above list. 

FOR VALUE RECEIVED, the undersigned hereby sell(s) and transfer(s) unto 

 

	
	 Please Insert Social Security or
 Other
Identifying Number of Assignee

	
	   


  
  

 
  
  

 
 (PLEASE
PRINT OR TYPE NAME AND ADDRESS INCLUDING POSTAL ZIP CODE OF ASSIGNEE)


  
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 the within Security of WELLS FARGO & COMPANY and does hereby irrevocably constitute
and appoint                                      attorney to
transfer the said Security on the books of the Company, with full power of substitution in the premises. 
 Dated:
                                         
        
  

	
	   



  

	
	   



 NOTICE: The signature to this assignment must correspond with the name as written upon the face of the
within instrument in every particular, without alteration or enlargement or any change whatever. 

  
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