X0306 4 2020-05-11 0 0001109354 BRUKER CORP BRKR 0001133649 LAUKIEN FRANK H C/O BRUKER CORPORATION 40 MANNING ROAD BILLERICA MA 01821 1 1 1 0 CEO, President Common Stock 2020-05-11 4 P 0 2500 39.11 A 38068625 D Common Stock 1046499 I By Former Spouse Common Stock 1042 I By Spouse Common Stock 344007 I By Son Common Stock 343527 I By Daughter Common Stock 201702 I As UTMA custodian for son Common Stock 71728 I As UTMA custodian for son The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $38.71 to $39.37, inclusive. The reporting person undertakes to provide to Bruker Corporation, any security holder of Bruker Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote (1) of this Form 4. The reporting person disclaims beneficial ownership of 1,046,499 shares held by the reporting person's former spouse, 1,042 shares held by the reporting person's spouse, 7,400 shares held by the reporting person's adult son and 6,920 shares held by the reporting person's adult daughter, and this report shall not be deemed an admission that the reporting person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose. /s/Michael Rich, Attorney-in-Fact 2020-05-13