FORM 3
        
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Mumford Colleen Elizabeth

2. Date of Event Requiring Statement (MM/DD/YYYY)
9/30/2019 

3. Issuer Name and Ticker or Trading Symbol

CABOT MICROELECTRONICS CORP [CCMP]

(Last)        (First)        (Middle)

C/O CABOT MICROELECTRONICS CORPORATION, 870 N COMMONS DRIVE

4. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                          _____ 10% Owner
___X___ Officer (give title below)        _____ Other (specify below)
VP, Marketing & Communications /

(Street)

AURORA, IL 60504      

(City)              (State)              (Zip)
5. If Amendment, Date Original Filed(MM/DD/YYYY)

 

6. Individual or Joint/Group Filing(Check Applicable Line)

_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person


Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)
2. Amount of Securities Beneficially Owned
(Instr. 4)
3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)
4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock (1)1825 D  

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 4)
2. Date Exercisable and Expiration Date
(MM/DD/YYYY)
3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)
4. Conversion or Exercise Price of Derivative Security5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)
6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date ExercisableExpiration DateTitleAmount or Number of Shares
Stock Options (Right to Buy) 12/3/2013 (2)12/3/2022 Common Stock 640 $32.64 D  
Stock Options (Right to Buy) 12/3/2014 (3)12/3/2023 Common Stock 416 $44.10 D  
Stock Options (Right to Buy) 12/3/2015 (4)12/3/2024 Common Stock 363 $46.45 D  
Stock Options (Right to Buy) 12/3/2016 (5)12/3/2025 Common Stock 1324 $42.37 D  
Stock Options (Right to Buy) 12/5/2017 (6)12/5/2026 Common Stock 2740 $60.27 D  
Stock Options (Right to Buy) 12/5/2018 (7)12/5/2027 Common Stock 774 $92.57 D  
Stock Options (Right to Buy) 12/6/2019 (8)12/6/2028 Common Stock 832 $101.73 D  

Explanation of Responses:
(1) Subject to restrictions according to various vesting schedules.
(2) 2012 (FY13) Non-Qualified Stock Option Grant Vesting Schedule: 25% 12/03/2013, 25% 12/03/2014, 25% 12/03/2015, 25% 12/03/2016.
(3) 2013 (FY14) Non-Qualified Stock Option Grant Vesting Schedule: 25% 12/03/2014, 25% 12/03/2015, 25% 12/03/2016, 25% 12/03/2017.
(4) 2014 (FY15) Non-Qualified Stock Option Grant Vesting Schedule: 25% 12/03/2015, 25% 12/03/2016, 25% 12/03/2017, 25% 12/03/2018.
(5) 2015 (FY16) Non-Qualified Stock Option Grant Vesting Schedule: 25% 12/03/2016, 25% 12/03/2017, 25% 12/03/2018, 25% 12/03/2019.
(6) 2016 (FY17) Non-Qualified Stock Option Grant Vesting Schedule: 25% 12/05/2017, 25% 12/05/2018, 25% 12/05/2019, 25% 12/05/2020.
(7) 2017 (FY18) Non-Qualified Stock Option Grant Vesting Schedule: 25% 12/05/2018, 25% 12/05/2019, 25% 12/05/2020, 25% 12/05/2021.
(8) 2018 (FY19) Non-Qualified Stock Option Grant Vesting Schedule: 25% 12/06/2019, 25% 12/06/2020, 25% 12/06/2021, 25% 12/06/2022.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
Mumford Colleen Elizabeth
C/O CABOT MICROELECTRONICS CORPORATION
870 N COMMONS DRIVE
AURORA, IL 60504


VP, Marketing & Communications

Signatures
/s/ H. Carol Bernstein (Power of Attorney)10/1/2019
**Signature of Reporting PersonDate

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