Amended Statement of Beneficial Ownership (3/a)

FORM 3	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES	OMB APPROVAL OMB Number: 3235-0104 Estimated average burden hours per response... 0.5
	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 ^*

MACDONALD LAURA ANN

2. Date of Event Requiring Statement (MM/DD/YYYY) 5/3/2019

3. Issuer Name and Ticker or Trading Symbol

COGNEX CORP [CGNX]

(Last) (First) (Middle)

2 FREEMAN CIRCLE

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

_____ Director _____ 10% Owner
_____ Officer (give title below) ___ X ___ Other (specify below)
/ See Remarks

(Street)

HUDSON, MA 01749

(City) (State) (Zip)

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

5/6/2019

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)

*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 Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivate Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security		6. Nature of Indirect Beneficial Ownership (Instr. 5)
Non-Qualified Stock Option (right to buy)	2/12/2017 ⁽²⁾	2/12/2026	Common Stock	36000 ⁽¹⁾	$16.72	D
Non-Qualified Stock Option (right to buy)	2/17/2016 ⁽²⁾	2/17/2025	Common Stock	24000 ⁽¹⁾	$20.625	D
Non-Qualified Stock Option (right to buy)	2/21/2018 ⁽²⁾	2/21/2027	Common Stock	50000	$38.39	D
Non-Qualified Stock Option (right to buy)	5/1/2022 ⁽³⁾	5/1/2029	Common Stock	10000	$48.28	D
Non-Qualified Stock Option (right to buy)	2/19/2020 ⁽⁴⁾	2/19/2029	Common Stock	37500	$51.49	D
Non-Qualified Stock Option (right to buy)	2/20/2019 ⁽⁴⁾	2/20/2028	Common Stock	25000	$56.44	D

Explanation of Responses:
(1)	On May 6, 2019, the reporting person mistakenly filed a Form 3 reporting ownership of stock options that had been previously exercised and were no longer outstanding on May 3, 2019. This amendment is being filed to remove five line items in Table II and to reduce the number of shares underlying stock options in two other line items in Table II that, in each case, included options that were previously exercised. As of May 3, 2019, the reporting person held options to purchase a total of 182,500 shares of common stock. This amendment is also being filed to include the vesting schedules for the outstanding stock options.
(2)	This stock option became or becomes exercisable in four equal annual installments beginning on the date set forth in this column.
(3)	This stock option vests on the third anniversary of the date of grant.
(4)	This stock option became or becomes exercisable in five equal annual installments beginning on the date set forth in this column.

Remarks:
Principal Financial & Accounting Officer

Reporting Owners
Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
MACDONALD LAURA ANN 2 FREEMAN CIRCLE HUDSON, MA 01749				See Remarks

Signatures
/s/ Laura MacDonald		5/8/2019
^** 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 5(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.