SEC FORM 4

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person^*

SERRAO GREGORY A

(Last)

(First)

(Middle)

201 EDGEWATER DRIVE

(Street)

WAKEFIELD

01880

(City)

(State)

(Zip)

2. Issuer Name and Ticker or Trading Symbol
AMERICAN DENTAL PARTNERS INC [ ADPI ]

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

X	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	Chief Executive Officer

3. Date of Earliest Transaction (Month/Day/Year)
05/07/2007

4. If Amendment, Date of 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

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	05/07/2007		M		700	A	$5.23	467,160⁽³⁾	D
Common Stock	05/07/2007		S		700	D	$25.006	467,160⁽³⁾	D
Common Stock	05/07/2007		M		26,669	D	$5.23	467,160	D
Common Stock	05/07/2007		S		26,669	D	$25.006	467,160	D
Common Stock	05/07/2007		M		13,758	D	$5.99	467,160	D
Common Stock	05/07/2007		S		13,758	D	$25.006	467,160	D

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Nonqualified option (right to buy)	$5.23	05/07/2007		M			700	02/25/2003⁽¹⁾	02/25/2012	Common Stock	700	$0	430,037⁽²⁾	D
Nonqualified option (right to buy)	$5.23	05/07/2007		M			26,669	02/25/2003⁽¹⁾	02/25/2012	Common Stock	26,669	$0	430,037⁽²⁾	D
Nonqualified option (right to buy)	$5.99	05/07/2007		M			13,758	07/03/2004⁽¹⁾	07/03/2013	Common Stock	13,758	$0	430,037⁽²⁾	D

Explanation of Responses:

1. Option vests with respect to 25% of shares subject to option on each of the first four anniversaries of the date of grant.

2. Total number of derivative securities beneficially owned (430,037) reflects all options held by reporting person pursuant to employee benefit plans of issuer.

3. Does not include 34,590 shares of common stock held indirectly by reporting person through joint ownership with spouse, through other members of immediately family, and through a trust for the benefit of members of immediate family.

	Mark W. Vargo, Attorney-in-Fact and Agent	05/08/2007
	** 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.