FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN 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 *

Vahedi Vahid
2. Issuer Name and Ticker or Trading Symbol

LAM RESEARCH CORP [ LRCX ]
5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      _____ 10% Owner
__ X __ Officer (give title below)      _____ Other (specify below)
Group Vice President
(Last)          (First)          (Middle)

C/O LAM RESEARCH CORPORATION, 4650 CUSHING PARKWAY
3. Date of Earliest Transaction (MM/DD/YYYY)

2/9/2018
(Street)

FREMONT, CA 94538
(City)        (State)        (Zip)
4. 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 Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock   2/9/2018     M    9304   (1) A $165.87   49294   (2) D    
Common Stock   2/9/2018     F    3732   D $165.87   45562   (2) D    
Common Stock   2/9/2018     F    1025   D $165.87   44537   (2) D    

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Market-based Performance Restricted Stock Unit   $0.0   2/9/2018     M      6203   (1)        (3)   (3) Common Stock   6203.0   (3) $0   0   D    

Explanation of Responses:
(1)  On 2/11/15, the Reporting Person received a target grant of 6,203 Market-based Performance Restricted Stock Units vesting between 0% and 150% on 2/11/18. The performance of this award was based on the Lam Research Total Shareholder Return performance relative to the Philadelphia Semiconductor Sector Index Total Shareholder Return during the performance period of 2/2/15 to 2/1/18. The performance payout was approved at 150% of target.
(2)  Amount reported includes shares subject to unvested Restricted Stock Units.
(3)  These Market-based Performance Restricted Stock Units vest between 0% and 150% on 2/11/18. The performance of this award is based on the Lam Research Total Shareholder Return performance relative to the Philadelphia Semiconductor Sector Index Total Shareholder Return during the performance period of 2/2/15 to 2/1/18.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Vahedi Vahid
C/O LAM RESEARCH CORPORATION
4650 CUSHING PARKWAY
FREMONT, CA 94538


Group Vice President

Signatures
Leign Cramer by Power of Attorney 2/13/2018
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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