o |
Rule 13d-1(b)
|
o |
Rule 13d-1(c)
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x |
Rule
13d-1(d)
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CUSIP No. 67072V103 |
13G
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1) | NAMES OF REPORTING PERSONS |
David
S. Utterberg
|
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IRS IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) | |||
2) | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) | ||
(a) [ ]
|
|||
(b) [ ]
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|||
3) | SEC USE ONLY | ||
4) | CITIZENSHIP OR PLACE OF ORGANIZATION |
United
States
|
|
NUMBER OF |
5)
|
SOLE
VOTING POWER
|
1,989,528*
|
SHARES | |||
BENEFICIALLY |
6)
|
SHARED VOTING POWER |
0
|
OWNED BY | |||
EACH |
7)
|
SOLE DISPOSITIVE POWER |
1,989,528*
|
REPORTING | |||
PERSON WITH |
8)
|
SHARED DISPOSITIVE POWER |
0
|
9) | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON |
1,989,528*
|
|
10) | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) |
[ ]
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11) | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) | ||
Approximately 9.4%* | |||
12) | TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) |
IN
|
|
Item
1(a).
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Name
of Issuer:
NxStage
Medical, Inc.
|
Item
1(b).
|
Address
of Issuer’s Principal Executive
Offices:
|
Item
2(a).
|
Name
of Person Filing:
|
Item
2(b).
|
Address
of Principal Business Office or, if None,
Residence:
|
|
The
principal business office address of the Reporting Person
is:
|
Item
2(c).
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Citizenship:
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The
place of citizenship of the Reporting Person is the United
States.
|
Item
2(d).
|
Title
of Class of Securities:
Common
Stock, par
value $0.001 per share
|
Item
2(e).
|
CUSIP
Number:
67072V103
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Item
3.
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If
this statement is filed pursuant to Rules 13d-1(b), or 13d-2(b) or
(c),
check whether the person filing is
a:
|
Not
Applicable.
|
Item 4. |
Ownership.
|
(a) Amount beneficially owned: |
1,989,528*
|
||
(b) Percent of class: |
9.4%*
|
||
(c) Number of shares as to which the person has: | |||
(i)
Sole power to vote or to direct the vote
|
1,989,528*
|
||
(ii)
Shared power to vote or to direct the
vote
|
0
|
||
(iii)
Sole power to dispose or to direct the disposition
of
|
1,989,528*
|
||
(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 person has ceased to be the beneficial owner
of more
than five percent of the class of securities, check the
following.
|
Not
Applicable.
|
Item
6.
|
Ownership
of More than Five Percent on Behalf of Another
Person.
|
Not
applicable.
|
Item
7.
|
Identification
and Classification of the Subsidiary Which Acquired the Security
Being
Reported on by the Parent Holding
Company.
|
Item
8.
|
Identification
and Classification of Members of the
Group.
|
Item
9.
|
Notice
of Dissolution of Group.
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Item
10.
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Certification.
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Dated: January 18, 2006 | ||
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|
/s/ David S. Utterberg | ||
David S. Utterberg |