SEC FORM 3

SEC Form 3

FORM 3

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

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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

OMB APPROVAL

OMB Number:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

INVESTOR AB

(Last)

(First)

(Middle)

ARSENALSGATAN 8C S-103

(Street)

STOCKHOLM

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
08/12/2008

3. Issuer Name and Ticker or Trading Symbol
ACHILLION PHARMACEUTICALS INC [ ACHN ]

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

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

5. 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 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)
Common Stock⁽¹⁾	2,323,660	I	See Footnote⁽¹⁾

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
Warrants to Purchase Common Stock⁽²⁾	08/12/2008	08/12/2015	Common Stock	580,915	$3.53	I	See Footnote⁽²⁾
Warrants to Purchase Units⁽³⁾	02/11/2009	08/11/2009	See Footnote⁽⁴⁾	797,872	$2.82	I	See Footnote⁽³⁾

Explanation of Responses:

1. These shares of Common Stock, par value $0.001 per share ("Common Stock"), are held directly by Investor Growth Capital Limited ("Investor Growth Capital") and Investor Group, L.P. Investor Growth Capital is an indirect wholly-owned subsidiary of Investor AB. Investor Group, L.P. is a limited partnership of which Investor AB is the indirect general partner. Investor AB may be deemed to beneficially own the securities held by Investor Growth Capital and Investor Group, L.P. Investor AB disclaims beneficial ownership of such securities except to the extent of its pecuniary interest in such securities.

2. These warrants to purchase shares of Common Stock are held directly by Investor Growth Capital and Investor Group, L.P. Investor AB may be deemed to beneficially own the securities held by Investor Growth Capital and Investor Group, L.P. Investor AB disclaims beneficial ownership of such securities except to the extent of its pecuniary interest in such securities.

3. These warrants to purchase Units are held directly by Investor Growth Capital and Investor Group, L.P. Investor AB may be deemed to beneficially own the securities held by Investor Growth Capital and Investor Group, L.P. Investor AB disclaims beneficial ownership of such securities except to the extent of its pecuniary interest in such securities.

4. The Unit Warrants are exercisable for Units, which consist of one share of Common Stock plus a warrant to purchase 0.25 shares of Common Stock. The warrants underlying the Unit Warrants will, upon exercise, be immediately exercisable at a price of $3.53 per share and will expire on 8/12/2015.

	/s/ Michael Oporto	08/22/2008
	/s/ Henry Gooss	08/22/2008
	** 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 Number.