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 Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * SLYE BRADLEY D   2. Issuer Name and Ticker or Trading Symbol ELECTRO SENSORS INC [ELSE] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Chairman, President and CEO (Last) (First) (Middle) 6111 BLUE CIRCLE DRIVE 3. Date of Earliest Transaction (Month/Day/Year) 05/05/2006 (Street) MINNETONKA, MN 55343 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) 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 05/05/2006   M   18,000 A $ 1.5625 110,852 (3) D   Common Stock 05/16/2006   S   32,307 D $ 6.2815 78,545 D   Common Stock 05/16/2006   S   25,000 D $ 6.6232 53,545 D   Common Stock 05/16/2006   S   7,693 D $ 6.4243 45,852 D   Common Stock 05/17/2006   S   35,000 D $ 5.7995 10,852 D   Common Stock               5,190 I By Spouse Common Stock               18,329 (5) I By ESOP Common Stock 05/17/2006   S   300 D $ 5.8 605 (4) I By Children

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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 Underlying Securities (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

Employee Stock Option (Right to Buy)

$ 2.17

(1)

01/03/2007

Common Stock

75,000

15,000

D

Employee Stock Option (Right to Buy)

$ 1.5625

05/05/2006

M

18,000

(2)

08/02/2009

Common Stock

30,000

$ 0

0

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
SLYE BRADLEY D 6111 BLUE CIRCLE DRIVE MINNETONKA, MN 55343	X		Chairman, President and CEO

Signatures

Bradley D. Slye		05/18/2006
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	Exercisable in annual increments of 15,000 shares each commencing 1/3/97.
(2)	Exercisable in annual increments of 6,000 shares each commencing 8/3/99.
(3)	Includes 939 shares acquired pursuant to the Employee Stock Purchase Plan through January 6, 2006.
(4)	Includes 700 shares acquired pursuant to gifting transactions reported on Form 5 dated May 2006.
(5)	Updated total through 2/21/06.

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