SECURITIES AND EXCHANGE COMMISSION
Washington, D. C. 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934
ALNYLAM PHARMACEUTICALS, INC.
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(Name of Issuer)
Common Stock, $.01 par value per share
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(Title and Class of Securities)
02043Q107
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(CUSIP Number)
April 12, 2007
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(Date of Event which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this schedule
is filed:
[x] Rule 13d-1(b)
[ ] Rule 13d-1(c)
[ ] Rule 13d-1(d)
* The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.
The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 (the "Act") or otherwise subject to the liabilities of that section of the
Act but shall be subject to all other provisions of the Act (however, see the
Notes).
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CUSIP No. 02043Q107 Page 2 of 6 Pages
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1 NAMES OF REPORTING PERSONS
S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS
ALETHEIA RESEARCH AND MANAGEMENT, INC., IRS number 95-4647814, as
general partner of various limited partnerships and on behalf of
various managed accounts.
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2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ]
(b) [ ]
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3 SEC USE ONLY
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4 CITIZENSHIP OR PLACE OF ORGANIZATION
California
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5 SOLE VOTING POWER
2,443,996
NUMBER OF ------------------------------------------------------
SHARES 6 SHARED VOTING POWER
BENEFICIALLY
OWNED BY 0
EACH
REPORTING ------------------------------------------------------
PERSON 7 SOLE DISPOSITIVE POWER
WITH
2,443,996
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8 SHARED DISPOSITIVE POWER
0
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9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
2,443,996
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10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
SHARES* [ ]
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11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
6.51%
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12 TYPE OF REPORTING PERSON*
Aletheia Research and Management, Inc.- IA
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CUSIP No. 02043Q107 Page 3 of 6 Pages
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Item 1(a). Name of Issuer:
Alnylam Pharmaceuticals, Inc.
Item 1(b). Address of Issuer's Principal Executive Offices:
300 Third Street, Cambridge, MA 02142
Item 2(a). Name of Person Filing:
Aletheia Research and Management, Inc.
Item 2(b). Address of Principal Business Office or, if None, Residence:
100 Wilshire Boulevard, Suite 1960, Santa Monica, CA 90401
Item 2(c). Citizenship:
Not Applicable.
Item 2(d). Title of Class of Securities:
Common Stock, $.01 par value.
Item 2(e). CUSIP Number:
02043Q107
Item 3. If this statement is filed pursuant to Rule 13d-1(b), or 13d-2(b)
or (c), check whether the person filing is a:
(a) [ ] Broker or Dealer registered under Section 15 of the Act.
(b) [ ] Bank as defined in Section 3(a)(6) of the Act.
(c) [ ] Insurance Company as defined in Section 3(a)(19) of the Act.
(d) [ ] Investment Company registered under Section 8 of the
Investment Company Act.
(e) [X] Investment Adviser registered in accordance with Rule
13d-1(b)(1)(ii)(E).
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CUSIP No. 02043Q107 Page 4 of 6 Pages
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(f) [ ] Employee Benefit Plan or Endowment Fund in accordance with
Rule 13d-1(b)(1)(ii)(F).
(g) [ ] Parent Holding Company or control person in accordance with
Rule 13d-1(b)(1)(ii)(G).
(h) [ ] A savings association as defined in Section 3(b) of the
Federal Deposit Insurance Act.
(i) [ ] A church plan that is excluded from the definition of an
investment company under Section 3(c) (14) of the Investment
Company Act of 1940.
(j) [ ] Group, in accordance with Rule 13d-1(b)(1)(ii)(J).
If this Statement is filed pursuant to Rule 13d-1(c), check
this box [ ].
Item 4. Ownership.
(a) Amount beneficially owned: 2,443,996*
(b) Percent of Class: 6.51%
(c) Number of Shares as to which the person has:
(i) Sole power to vote or to direct the vote:
2,443,996
(ii) Shared power to vote or to direct the vote: 0
(iii) Sole power to dispose or to direct the
disposition of: 2,443,996
(iv) Shared Power to dispose or to direct the
disposition of: 0
* See Disclaimer of Beneficial Ownership
Item 5. Ownership of Five Percent or Less of a Class.
If this statement is being filed to report the fact that as of the
date hereof the reporting person has ceased to be the beneficial owner of more
than five percent of the class of securities, check the following. [ ].
Item 6 Ownership of More than Five Percent on Behalf of Another Person.
Various accounts and funds managed by the reporting person have
the right to receive or the power to direct the receipt of
dividends from, or the proceeds from the sale of, the securities
held in their respective accounts. To the knowledge of the
reporting person, the interest of any one such account does not
exceed 5% of the class of securities.
Item 7. Identification and Classification of the Subsidiary Which
Acquired the Security Being Reported on by the Parent Holding
Company.
Not Applicable.
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CUSIP No. 02043Q107 Page 5 of 6 Pages
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Item 8. Identification and Classification of Members of the Group.
Not Applicable
Item 9. Notice of Dissolution of Group.
Not Applicable.
Item 10. Certification.
By signing below, I certify that, to the best of my knowledge and
belief, the securities referred to above were not acquired and
are not held for the purpose of or with the effect of changing or
influencing the control of the issuer of the securities and were
not acquired and are not held in connection with or as a
participant in any transaction having that purpose or effect.
SIGNATURE
Date: June 6, 2007 ALETHEIA RESEARCH AND MANAGEMENT, INC.,
By: /s/ Roger Peikin
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Name: Roger Peikin
Title: Executive Vice-President
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EXHIBIT A
DISCLAIMER OF BENEFICIAL OWNERSHIP
Alnylam Pharmaceuticals, Inc.
Common Stock
2,443,996 shares
Aletheia Research and Management, Inc. ("Aletheia") is an investment advisor
registered under Section 203 of the Investment Advisors Act of 1940 and serves
in such capacity for a number of managed accounts and funds. In its role as an
investment advisor or manager, Aletheia possesses investment and/or voting power
over the securities of the Issuer discussed in this schedule. Aletheia disclaims
beneficial ownership of such securities. In addition, the filing of this
Schedule 13G shall not be construed as an admission that the reporting person or
any of its affiliates is the beneficial owner of any securities covered by this
Schedule 13G for any purposes other than Section 13(a) of the Securities
Exchange Act of 1934.
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