Ford Tamer (President & CEO) bought 9,790 LSCC at $102.52, worth $1M

SEC Form 4

FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Estimated average burden hours per response: 0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue.

See

Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person * Tamer Ford

(Last) (First) (Middle)

5555 NE MOORE COURT

(Street) HILLSBORO

OREGON

97124

(City) (State) (Zip)

UNITED STATES

(Country) 2. Issuer Name and Ticker or Trading Symbol

LATTICE SEMICONDUCTOR CORP [ LSCC ]

5. Relationship of Reporting Person(s) to Issuer

(Check all applicable) X Director 10% Owner

X Officer (give title below) Other (specify below)

President & CEO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction

(Month/Day/Year)

11/04/2026 6. Individual or Joint/Group Filing (Check Applicable Line)

X Form filed by One Reporting Person

Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed

(Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1. Title of Security (Instr.

3)

2. Transaction Date

(Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction 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 315,677 I Ford Tamer

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr.

3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date

(Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction 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

(Month/Day/Year) 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: 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

Explanation of Responses:

1. This transaction was executed in multiple trades at prices ranging from $101.1900 to $102.1500. The price reported above reflects the weighted average sale price⁴. The Reporting Person undertakes to provide upon request by the staff of the Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate sale price.

2. This transaction was executed in multiple trades at prices ranging from $102.2300 to $103.2000. The price reported above reflects the weighted average sale price. The Reporting Person undertakes to provide upon request by the staff of the Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate sale price.

3. This transaction was executed in multiple trades at prices ranging from $103.2300 to $103.5600. The price reported above reflects the weighted average sale price. The Reporting Person undertakes to provide upon request by the staff of the Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate sale price.

/s/ Tracy Feanny, Attorney in Fact For: Ford Tamer 11/04/2026

** 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 Number.

* Form 4: SEC 1474 (03-26)