Exhibit 10.26

IMMUNOMEDICS, INC.

NOTICE OF GRANT OF STOCK OPTION

Notice is hereby given of the following option grant (the Option) to purchase shares of the Common Stock of Immunomedics, Inc. (the
Corporation):



|         |  |  |  |  |  |  |  | 
|-------- |  |  |  |  |  |  |  | 
|Optionee |  | 

|            |  |  |  |  |  |  |  | 
|----------- |  |  |  |  |  |  |  | 
|            | 
|Grant Date: |  | 

|                           |  |  |  |  |  |  |  | 
|-------------------------- |  |  |  |  |  |  |  | 
|                           | 
|Vesting Commencement Date: |  | 

|                |  |   |  |  |  |           |  | 
|--------------- |  | - |  |  |  | --------- |  | 
|                |  |   | 
|Exercise Price: |  | $ |  |  |  | per share

|                         |  |  |  |        |  |  |  | 
|------------------------ |  |  |  | ------ |  |  |  | 
|                         |  | 
|Number of Option Shares: |  |  |  | shares

|                 |  |  |  |  |  |  |  | 
|---------------- |  |  |  |  |  |  |  | 
|                 | 
|Expiration Date: |  | 

|                |  |   |  |                            |  |  |  | 
|--------------- |  | - |  | -------------------------- |  |  |  | 
|                |  |   |  |                           
|Type of Option: |  |  ̈ |  | Incentive Stock Option     |  |  |  | 
|                |  |   |  |                           
|                |  |  ̈ |  | Non-Statutory Stock Option |  |  |  | 

Exercise Schedule: The Option shall become exercisable for twenty-five percent
(25%) of the Option Shares upon Optionees completion of one (1) year of Service measured from the Vesting Commencement Date and shall become exercisable for the balance of the Option Shares in a series of twelve (12) successive
equal quarterly installments upon Optionees completion of each additional quarter of Service over the thirty-six (36) month period measured from the first anniversary of the Vesting Commencement Date. In no event shall the Option become
exercisable for any additional Option Shares after Optionees cessation of Service.

Optionee understands and agrees that the Option
is granted subject to and in accordance with the terms of the Immunomedics, Inc. 2006 Stock Incentive Plan (the Plan). Optionee further agrees to be bound by the terms of the Plan and the terms of the Option as set forth in the Stock
Option Agreement attached hereto as Exhibit A. Optionee hereby acknowledges the receipt of a copy of the official prospectus for the Plan in the form attached hereto as Exhibit B. A copy of the Plan is available upon request made to
the Corporate Secretary at the Corporations principal offices.

Employment at Will. Nothing in this Notice or in the attached
Stock Option Agreement or in the Plan shall confer upon Optionee any right to continue in Service for any period of specific duration or interfere with or otherwise restrict in any way the rights of the



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Corporation (or any Parent or Subsidiary employing or retaining Optionee) or of Optionee, which rights are hereby expressly reserved by each, to terminate
Optionees Service at any time for any reason, with or without cause.

Definitions. All capitalized terms in this Notice shall
have the meaning assigned to them in this Notice or in the attached Stock Option Agreement.

IN WITNESS WHEREOF,the parties have
executed this Grant Notice as of the Grant Date specified above.



IMMUNOMEDICS, INC.By:Title:OPTIONEE:Address:Witness:


ATTACHMENTS

Exhibit AStock Option Agreement

Exhibit BPlan Summary and Prospectus



2



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EXHIBIT A

STOCK OPTION AGREEMENT



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EXHIBIT B

PLAN SUMMARY AND PROSPECTUS