UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

o

Rule 13d-1(b)

x

Rule 13d-1(c)

o

Rule 13d-1(d)

CUSIP No. 116794108

13G

1

Name of Reporting Persons
Isolde Laukien-Kleiner

2

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

(a)

o

(b)

o

3

SEC Use Only

4

Citizenship or Place of Organization
Germany

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5

Sole Voting Power
8,370,869 shares

6

Shared Voting Power
0

7

Sole Dispositive Power
8,370,869 shares

8

Shared Dispositive Power
0

9

Aggregate Amount Beneficially Owned by Each Reporting Person
8,370,869 shares

10

Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)  o

11

Percent of Class Represented by Amount in Row (9)
5.1%

12

Type of Reporting Person (See Instructions)
IN

Item 1 (a).

Name of Issuer:
Bruker Corporation

Item 1 (b).

Address of Issuer’s Principal Executive Offices:
40 Manning Road

Billerica, MA  01821

Item 2 (a).

Name of Person Filing:
Isolde Laukien-Kleiner

Item 2 (b).

Address of Principal Business Office or, if none, Residence:
Lichtentaler Allee 68

D-76530  Baden-Baden

Germany

Item 2 (c).

Citizenship:
German citizen and resident

Item 2 (d).

Title of Class of Securities:
Common Stock, par value $0.01 per share.

Item 2 (e).

CUSIP Number:
116794108

Item 3.

If this statement is filed pursuant to §§240.13d-1(b), or 240.13d-2(b) or (c), check whether the person filing is a:

Not applicable.

(a)

o

Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);

(b)

o

Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);

(c)

o

Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);

(d)

o

Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);

(e)

o

An investment adviser in accordance with §240.13d-1(b)(1)(ii)(E);

(f)

o

An employee benefit plan or endowment fund in accordance with §240.13d-1(b)(1)(ii)(F);

(g)

o

A parent holding company or control person in accordance with §240.13d-1(b)(1)(ii)(G);

(h)

o

A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

(i)

o

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 (15 U.S.C. 80a-3);

(j)

o

A non-U.S. institution in accordance with §240.13d–1(b)(1)(ii)(J);

(k)

o

Group, in accordance with §240.13d–1(b)(1)(ii)(K).

Item 4.

Ownership

(a)

Amount beneficially owned:   

8,370,869 shares

(b).

Percent of class:   

5.1%

(c)

Number of shares as to which such person has:

(i)

Sole power to vote or to direct the vote   

8,370,869 shares

(ii)

Shared power to vote or to direct the vote    

0

(iii)

Sole power to dispose or to direct the disposition of   

8,370,869 shares

(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   o.

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 or Control Person

Not applicable.

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.

Dated: February 1, 2011

/s/ Isolde Laukien

Isolde Laukien-Kleiner