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

                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934
                                (Amendment No. )*

                               INSMED INCORPORATED
                               -------------------
                                (Name of Issuer)

                     Common Stock, par value $.01 per share
                     --------------------------------------
                         (Title of Class of Securities)

                                    457669208
                                    ---------
                                 (CUSIP Number)

                                 March 15, 2005
                                 --------------
                      (Date of Event which Requires Filing
                               of this Statement)

Check the  appropriate box to designate the rule pursuant to which this Schedule
is filed:

                  [ ] Rule 13d-1(b)
                  [X] 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 on 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 ("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).

                          Continued on following pages
                               Page 1 of 10 Pages
                              Exhibit Index: Page 9





                                  SCHEDULE 13G

CUSIP No. 457669208                                           Page 2 of 10 Pages


1        Names of Reporting Persons
         I.R.S. Identification Nos. of above persons (entities only)

                  SAGAMORE HILL CAPITAL MANAGEMENT L.P.

2        Check the Appropriate Box If a Member of a Group (See Instructions)

                                        a. [ ]
                                        b. [X]

3        SEC Use Only

4        Citizenship or Place of Organization

              DELAWARE

                     5       Sole Voting Power
 Number of                          2,992,279
  Shares
Beneficially         6       Shared Voting Power
  Owned By                          0
   Each
 Reporting           7       Sole Dispositive Power
   Person                           2,992,279
   With
                     8       Shared Dispositive Power
                                    0

9        Aggregate Amount Beneficially Owned by Each Reporting Person

                          2,972,279

10       Check Box If the Aggregate Amount in Row (9) Excludes Certain
         Shares (See Instructions)

                          [   ]

11       Percent of Class Represented By Amount in Row (9)

                          6.24%

12       Type of Reporting Person (See Instructions)

                          PN





                                  SCHEDULE 13G

CUSIP No. 457669208                                           Page 3 of 10 Pages


1        Names of Reporting Persons
         I.R.S. Identification Nos. of above persons (entities only)

                  SAGAMORE HILL MANAGERS LLC

2        Check the Appropriate Box If a Member of a Group (See Instructions)

                                        a. [ ]
                                        b. [X]

3        SEC Use Only

4        Citizenship or Place of Organization

              DELAWARE

                     5       Sole Voting Power
 Number of                          2,992,279
  Shares
Beneficially         6       Shared Voting Power
  Owned By                          0
   Each
 Reporting           7       Sole Dispositive Power
   Person                           2,992,279
   With
                     8       Shared Dispositive Power
                                    0

9        Aggregate Amount Beneficially Owned by Each Reporting Person

                          2,972,279

10       Check Box If the Aggregate Amount in Row (9) Excludes Certain
         Shares (See Instructions)

                          [   ]

11       Percent of Class Represented By Amount in Row (9)

                          6.24%

12       Type of Reporting Person (See Instructions)

                          OO





                                  SCHEDULE 13G

CUSIP No. 457669208                                           Page 4 of 10 Pages


1        Names of Reporting Persons
         I.R.S. Identification Nos. of above persons (entities only)

                  STEVEN H. BLOOM

2        Check the Appropriate Box If a Member of a Group (See Instructions)

                                        a. [ ]
                                        b. [X]

3        SEC Use Only

4        Citizenship or Place of Organization

              UNITED STATES

                     5       Sole Voting Power
 Number of                          2,992,279
  Shares
Beneficially         6       Shared Voting Power
  Owned By                          0
   Each
 Reporting           7       Sole Dispositive Power
   Person                           2,992,279
   With
                     8       Shared Dispositive Power
                                    0

9        Aggregate Amount Beneficially Owned by Each Reporting Person

                          2,972,279

10       Check Box If the Aggregate Amount in Row (9) Excludes Certain
         Shares (See Instructions)

                          [   ]

11       Percent of Class Represented By Amount in Row (9)

                          6.24%

12       Type of Reporting Person (See Instructions)

                          IN; HC



                                                              Page 5 of 10 Pages


Item 1(a)         Name of Issuer:

                  Insmed Incorporated (the "Issuer")

Item 1(b)         Address of the Issuer's Principal Executive Offices:

                  4851 Lake Brook Drive, Glen Allen, Virginia 23060

Item 2(a)         Name of Person Filing:

                  The  Statement  is filed on  behalf  of each of the  following
persons (collectively, the "Reporting Persons"):

                    i.   Sagamore Hill Capital  Management L.P.  ("Sagamore Hill
                         Capital Management");

                    ii.  Sagamore Hill Managers LLC ("Sagamore Managers"); and

                    iii. Steven H. Bloom ("Mr. Steven Bloom").

                  This Statement  relates to securities  held for the account of
the Sagamore Hill Hub Fund Ltd., a Cayman Islands  corporation (the "Hub Fund").
Pursuant to a portfolio management  agreement,  Sagamore Hill Capital Management
serves as investment  manager of the Hub Fund. In such  capacity,  Sagamore Hill
Capital  Management may be deemed to be the beneficial  owner of securities held
for the account of the Hub Fund.  The general  partner of Sagamore  Hill Capital
Management is Sagamore Managers. In such capacity, Sagamore Hill Managers may be
deemed to be the beneficial  owner of securities held for the account of the Hub
Fund.  Mr.  Steven  Bloom is the  sole  member  of  Sagamore  Managers.  In such
capacity,  Mr.  Steven  Bloom  may be  deemed  to be  the  beneficial  owner  of
securities held for the account of the Hub Fund.

Item 2(b)         Address of Principal Business Office or, if None, Residence:

                  The address of the principal business office of each of the
Reporting Persons is 10 Glenville Street, 3rd Floor, Greenwich, CT 06831.

Item 2(c)         Citizenship:

                  1) Sagamore  Hill  Capital  Management  is a Delaware  limited
partnership;

                  2) Sagamore Managers is a Delaware limited liability  company;
and

                  3) Mr. Steven Bloom is a citizen of the United States.

Item 2(d)         Title of Class of Securities:

                  Common stock, par value $.01 per share (the "Shares").

Item 2(e)         CUSIP Number:

                  457669208





                                                              Page 6 of 10 Pages

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:

                  This Item 3 is not applicable.

Item 4.           Ownership:

Item 4(a)         Amount Beneficially Owned:

                  According to the Issuer's  most recent  annual  report on Form
10-K  filed  with  the  Securities  and  Exchange  Commission,  the  Issuer  had
44,986,996 Shares outstanding as of February 28, 2005.

                  As  of  the  date  hereof,   each  of  Sagamore  Hill  Capital
Management,  Sagamore  Managers  and Mr.  Steven  Bloom  may be deemed to be the
beneficial  owner of 2,992,279  Shares  (assuming the conversion of warrants and
other convertible securities held for the account of the Hub Fund).

Item 4(b)         Percent of Class:

                  The number of Shares of which each of  Sagamore  Hill  Capital
Management,  Sagamore  Managers  and Mr.  Steven  Bloom  may be deemed to be the
beneficial owner as of the date hereof  constitutes  approximately  6.24% of the
total number of Shares  outstanding  (assuming  the  conversion  of warrants and
other convertible securities held for the account of the Hub Fund).

Item 4(c)         Number of shares as to which such person has:

         Sagamore Hill Capital Management
         --------------------------------
         (i)       Sole power to vote or direct the vote:              2,992,279

         (ii)      Shared power to vote or to direct the vote                  0

         (iii)     Sole power to dispose or to direct the 
                   disposition of                                      2,992,279

         (iv)      Shared power to dispose or to direct the 
                   disposition of                                              0

         Sagamore Managers
         -----------------
         (i)       Sole power to vote or direct the vote:              2,992,279

         (ii)      Shared power to vote or to direct the vote                  0

         (iii)     Sole power to dispose or to direct the 
                   disposition of                                      2,992,279

         (iv)      Shared power to dispose or to direct the 
                   disposition of                                              0





                                                              Page 7 of 10 Pages

         Mr. Steven Bloom
         ----------------
         (i)       Sole power to vote or direct the vote:              2,992,279

         (ii)      Shared power to vote or to direct the vote                  0

         (iii)     Sole power to dispose or to direct the 
                   disposition of                                      2,992,279

         (iv)      Shared power to dispose or to direct the 
                   disposition of                                              0

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 Persons have ceased to be the beneficial owners 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:

                  The shareholders of the Hub Fund have the right to participate
in the receipt of dividends  from, or proceeds from the sale of, the  securities
held  for  the  account  of the Hub  Fund in  accordance  with  their  ownership
interests in the Hub Fund.

Item 7.           Identification and Classification of the Subsidiary Which 
                  Acquired the Security Being Reported on by the Parent Holding 
                  Company or Control Person:

                  This Item 7 is not applicable.

Item 8.           Identification and Classification of Members of the Group:

                  This Item 8 is not applicable.

Item 9.           Notice of Dissolution of Group:

                  This Item 9 is not applicable.

Item 10.          Certification:

                  By signing below each of the Reporting Persons certifies that,
to the best of such person's  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 such securities and were
not  acquired and are not held in  connection  with or as a  participant  in any
transaction having such purpose or effect.





                                                              Page 8 of 10 Pages

                                   SIGNATURES


     After  reasonable  inquiry and to the best of my knowledge and belief,  the
undersigned  certifies that the information set forth in this statement is true,
complete and correct.

Date:  March 24, 2005                  SAGAMORE HILL CAPITAL MANAGEMENT L.P.

                                       By: Sagamore Hill Managers LLC,
                                           Its General Partner

                                       By: /s/ Steven H. Bloom
                                       -----------------------------------------
                                           Name:  Steven H. Bloom
                                           Title: Manager

Date:  March 24, 2005                  SAGAMORE HILL MANAGERS LLC


                                        By: /s/ Steven H. Bloom
                                       -----------------------------------------
                                           Name:  Steven H. Bloom
                                           Title: Manager

Date:  March 24, 2005                  STEVEN H. BLOOM


                                       /s/ Steven H. Bloom
                                       -----------------------------------------





                                                              Page 9 of 10 Pages


                                  EXHIBIT INDEX

                                                                        Page No.
                                                                        --------

A.      Joint Filing Agreement, dated as of March 24, 2005, 
        by and among Sagamore Hill Capital Management L.P., 
        Sagamore Hill Managers LLC and Mr. Steven H. Bloom...                 10





                                                             Page 10 of 10 Pages


                                    EXHIBIT A

                             JOINT FILING AGREEMENT

     The  undersigned  hereby agree that this Initial  Statement on Schedule 13G
with respect to the common stock of Insmed  Incorporated,  dated as of March 24,
2005,  is, and any  amendments  thereto  (including  amendments on Schedule 13D)
signed  by each of the  undersigned  shall  be,  filed on  behalf  of each of us
pursuant to and in accordance  with the  provisions  of Rule 13d-1(k)  under the
Securities Exchange Act of 1934.


Date:  March 24, 2005                  SAGAMORE HILL CAPITAL MANAGEMENT L.P.

                                       By: Sagamore Hill Managers LLC,
                                           Its general partner

                                       By: /s/ Steven H. Bloom
                                       -----------------------------------------
                                           Name:  Steven H. Bloom
                                           Title: Manager

Date:  March 24, 2005                  SAGAMORE HILL MANAGERS LLC


                                        By: /s/ Steven H. Bloom
                                       -----------------------------------------
                                           Name:  Steven H. Bloom
                                           Title: Manager

Date:  March 24, 2005                  STEVEN H. BLOOM


                                       /s/ Steven H. Bloom
                                       -----------------------------------------