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Jeannemarie O'Brien

Partner at Wachtell Lipton Rosen & Katz

Lawyer

Deal Bio

Total Deals69

Valued Deals54

Total Value£ 504.08 B

Avg. Deal Size£ 9.33 B

Market Context

Awards

2024 Top Employment Lawyers in North America

2023 Top Employment Lawyers in North America

2020 Top Female M&A Lawyers in North America

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30 Jan 2018|United States|Financial Data and Systems

Target: REFINITIV HOLDINGS INC

Bidder: BLACKSTONE GROUP INC

31 Service Providers

18 Bidder | 13 Vendor

102 Dealmakers

62 Bidder | 40 Vendor

£ 12.06 B

Value

08 Mar 2018|United States|Pharmaceuticals

Target: EXPRESS SCRIPTS HOLDING CO

Bidder: CIGNA CORPORATION

15 Service Providers

6 Target | 9 Bidder

66 Dealmakers

41 Target | 25 Bidder

£ 48.67 B

Value

24 Jul 2018|United States|Banks

Target: FCB FINANCIAL HOLDINGS INC

Bidder: SYNOVUS FINANCIAL CORP

12 Service Providers

5 Target | 7 Bidder

52 Dealmakers

23 Target | 29 Bidder

£ 2.21 B

Value

28 Jan 2019|United States|Banks

Target: CHEMICAL FINANCIAL CORPORATION

Bidder: TCF FINANCIAL

10 Service Providers

5 Target | 5 Bidder

48 Dealmakers

31 Target | 17 Bidder

£ 2.73 B

Value

28 May 2019|United States|Payments / Commerce

Target: TOTAL SYSTEM SERVICES INC

Bidder: GLOBAL PAYMENTS INC

12 Service Providers

4 Target | 8 Bidder

81 Dealmakers

44 Target | 37 Bidder

£ 20.25 B

Value

09 Jun 2019|United States|Defense

Target: RAYTHEON COMPANY

Bidder: UNITED TECHNOLOGIES CORP

13 Service Providers

6 Target | 7 Bidder

96 Dealmakers

64 Target | 32 Bidder

£ 69.76 B

Value

17 Jun 2019|United States|Pharmaceuticals

Target: ARRAY BIOPHARMA

Bidder: PFIZER INC

10 Service Providers

4 Target | 6 Bidder

51 Dealmakers

21 Target | 30 Bidder

£ 9.05 B

Value

29 Jul 2019|United States|Pharmaceuticals

Target: UPJOHN

Bidder: MYLAN NV

20 Service Providers

1 Target | 9 Bidder | 10 Vendor

144 Dealmakers

1 Target | 78 Bidder | 65 Vendor

£ 18.11 B

Value

05 Sep 2019|United States|Health Care Services

Target: ASSURANCE IQ

Bidder: PRUDENTIAL FINANCIAL INC

8 Service Providers

4 Target | 4 Bidder

60 Dealmakers

17 Target | 43 Bidder

£ 1.89 B

Value

25 Nov 2019|United States|Asset Managers and Custodians

Target: TD AMERITRADE HOLDING CORP

Bidder: CHARLES SCHWAB CORPORATION

16 Service Providers

6 Target | 5 Bidder | 5 Vendor

65 Dealmakers

37 Target | 16 Bidder | 12 Vendor

£ 20.25 B

Value

21 Jan 2020|United States|Banks

Target: FRANKLIN FINANCIAL CORPORATION

Bidder: FB FINANCIAL CORPORATION

8 Service Providers

4 Target | 4 Bidder

32 Dealmakers

17 Target | 16 Bidder

£ 470 M

Value

02 Aug 2020|United States|Specialty Retailers

Target: SPEEDWAY

Bidder: 7-ELEVEN INC

17 Service Providers

12 Bidder | 5 Vendor

60 Dealmakers

29 Bidder | 31 Vendor

£ 16.05 B

Value

19 Oct 2020|United States|Integrated Oil and Gas

Target: CONCHO RESOURCES INC

Bidder: CONOCOPHILLIPS COMPANY

11 Service Providers

6 Target | 5 Bidder

41 Dealmakers

21 Target | 20 Bidder

£ 7.51 B

Value

19 Oct 2020|United States|Engineering Consulting

Target: UNITED E&C INC

Bidder: CRITICALPOINT CAPITAL LLC

4 Service Providers

1 Target | 1 Bidder | 2 Vendor

16 Dealmakers

1 Target | 1 Bidder | 14 Vendor

n/a

Value

16 Nov 2020|United States|Banks

Target: BBVA USA

Bidder: THE PNC FINANCIAL SERVICES GROUP INC

13 Service Providers

8 Bidder | 5 Vendor

55 Dealmakers

21 Bidder | 34 Vendor

£ 8.79 B

Value

16 Nov 2020|United States|Maintenance Repair and Overhaul (MRO)

Target: HD SUPPLY HOLDINGS INC

Bidder: THE HOME DEPOT

7 Service Providers

4 Target | 3 Bidder

33 Dealmakers

10 Target | 23 Bidder

£ 6.06 B

Value

10 Dec 2020|United States|Construction Services

Target: AECOM (CIVIL CONSTRUCTION BUSINESS)

Bidder: OROCO CAPITAL

3 Service Providers

3 Vendor

16 Dealmakers

16 Vendor

n/a

Value

13 Dec 2020|United States|Banks

Target: TCF FINANCIAL

Bidder: HUNTINGTON BANCSHARES

9 Service Providers

4 Target | 5 Bidder

40 Dealmakers

19 Target | 21 Bidder

£ 4.48 B

Value

28 Dec 2020|United States|Entertainment

Target: CXLOYALTY (GLOBAL LOYALTY BUSINESS)

Bidder: JP MORGAN CHASE & CO

6 Service Providers

3 Bidder | 3 Vendor

39 Dealmakers

24 Bidder | 15 Vendor

n/a

Value

04 Jan 2021|United States|Banks

Target: BOSTON PRIVATE

Bidder: SVB FINANCIAL GROUP

9 Service Providers

4 Target | 5 Bidder

38 Dealmakers

16 Target | 22 Bidder

£ 660 M

Value

12 Apr 2021|United States|Banks

Target: CADENCE BANCORPORATION

Bidder: BANCORPSOUTH BANK

9 Service Providers

5 Target | 4 Bidder

41 Dealmakers

14 Target | 27 Bidder

£ 4.38 B

Value

19 Apr 2021|United States|Banks

Target: STERLING BANCORP

Bidder: WEBSTER FINANCIAL CORPORATION

11 Service Providers

5 Target | 6 Bidder

32 Dealmakers

9 Target | 24 Bidder

£ 4.27 B

Value

22 Apr 2021|United States|Banks

Target: EAST BOSTON SAVINGS BANK

Bidder: ROCKLAND TRUST COMPANY

9 Service Providers

1 Target | 5 Bidder | 3 Vendor

29 Dealmakers

1 Target | 20 Bidder | 10 Vendor

£ 826 M

Value

11 May 2021|United States|Apparel Retailers

Target: BATH & BODY WORKS

Bidder: INSTITUTIONAL INVESTORS

7 Service Providers

2 Target | 5 Vendor

16 Dealmakers

5 Target | 11 Vendor

£ 2.98 B

Value

14 May 2021|United States|Entertainment

Target: MINNESOTA TIMBERWOLVES BASKETBALL LIMITED

Bidder: ALEX RODRIGUEZ

2 Service Providers

1 Target | 1 Bidder

19 Dealmakers

1 Target | 18 Bidder

£ 1.07 B

Value

14 Jul 2021|United States|Full Line Insurance

Target: AIG (LIFE & RETIREMENT BUSINESS)

Bidder: BLACKSTONE GROUP INC

10 Service Providers

1 Target | 4 Bidder | 5 Vendor

87 Dealmakers

1 Target | 41 Bidder | 45 Vendor

£ 1.59 B

Value

07 Oct 2021|South Korea|Life Insurance

Target: CIGNA (PERSONAL ACCIDENT, SUPPLEMENTAL HEALTH AND LIFE INSURANCE BUSINESS)

Bidder: CHUBB CORPORATION

7 Service Providers

4 Bidder | 3 Vendor

35 Dealmakers

20 Bidder | 15 Vendor

£ 4.23 B

Value

12 Oct 2021|United States|Banks

Target: UMPQUA HOLDINGS CORPORATION

Bidder: COLUMBIA BANKING SYSTEM

8 Service Providers

5 Target | 3 Bidder

45 Dealmakers

24 Target | 21 Bidder

£ 6.02 B

Value

30 Nov 2021|United States|Oil Equipment and Services

Target: AECOM (OIL AND GAS MAINTENANCE AND TURNAROUND SERVICES BUSNESS)

Bidder: GRAHAM CONSTRUCTION

4 Service Providers

1 Bidder | 3 Vendor

14 Dealmakers

1 Bidder | 13 Vendor

n/a

Value

15 Dec 2021|United States|Specialty Chemicals

Target: CMC MATERIALS INC

Bidder: ENTEGRIS INC

9 Service Providers

4 Target | 5 Bidder

39 Dealmakers

14 Target | 25 Bidder

£ 4.90 B

Value

20 Dec 2021|United States|Banks

Target: BANK OF THE WEST

Bidder: BMO FINANCIAL GROUP (BANK OF MONTREAL)

9 Service Providers

1 Target | 5 Bidder | 3 Vendor

44 Dealmakers

2 Target | 23 Bidder | 19 Vendor

£ 12.31 B

Value

16 Feb 2022|United States|FinTech

Target: BEND FINANCIAL

Bidder: WEBSTER FINANCIAL CORPORATION

3 Service Providers

1 Target | 2 Bidder

16 Dealmakers

2 Target | 14 Bidder

n/a

Value

15 Feb 2022|United States|Consumer Lending

Target: CARDWORKS

Bidder: PARTHENON CAPITAL PARTNERS

4 Service Providers

2 Target | 2 Bidder

12 Dealmakers

10 Target | 2 Bidder

n/a

Value

14 Apr 2022|United States|Online and Social Platforms

Target: X CORP (EX-TWITTER)

Bidder: ELON MUSK

26 Service Providers

9 Target | 17 Bidder

152 Dealmakers

98 Target | 55 Bidder

£ 34.50 B

Value

04 May 2022|United States|Software

Target: BLACK KNIGHT INC

Bidder: INTERCONTINENTAL EXCHANGE INC

10 Service Providers

4 Target | 6 Bidder

30 Dealmakers

19 Target | 11 Bidder

£ 12.35 B

Value

10 May 2022|United States|Rental Services: Consumer

Target: ARAMARK UNIFORM SERVICES

Bidder: INSTITUTIONAL INVESTORS

6 Service Providers

1 Target | 5 Vendor

26 Dealmakers

2 Target | 24 Vendor

n/a

Value

06 Jul 2022|United States|Management Consulting

Target: DBO PARTNERS

Bidder: PIPER SANDLER COMPANIES

5 Service Providers

3 Target | 2 Bidder

32 Dealmakers

17 Target | 15 Bidder

n/a

Value

04 Aug 2022|United States|Pharmaceuticals

Target: CHEMOCENTRYX INC

Bidder: AMGEN INC

7 Service Providers

4 Target | 3 Bidder

28 Dealmakers

10 Target | 18 Bidder

£ 3.04 B

Value

11 Oct 2022|United States|Chemicals: Diversified

Target: ENTEGRIS (PIPELINE AND INDUSTRIAL MATERIALS BUSINESS)

Bidder: INFINEUM

5 Service Providers

2 Bidder | 3 Vendor

22 Dealmakers

3 Bidder | 19 Vendor

n/a

Value

07 Nov 2022|United States|Health Care Services

Target: SUMMIT HEALTH - CITY MD

Bidder: CIGNA CORPORATION

17 Service Providers

7 Target | 10 Bidder

66 Dealmakers

38 Target | 28 Bidder

£ 7.83 B

Value

18 Nov 2022|United States|Data Centers and Hosting

Target: TITLEPOINT

Bidder: FIDELITY NATIONAL FINANCIAL INC

3 Service Providers

1 Bidder | 2 Vendor

15 Dealmakers

2 Bidder | 13 Vendor

£ 189 M

Value

13 Feb 2023|United States|Banks

Target: FIRST NATIONAL BANK OF SOUTH MIAMI

Bidder: UNITED COMMUNITY BANKS INC

8 Service Providers

4 Target | 4 Bidder

20 Dealmakers

9 Target | 11 Bidder

£ 96 M

Value

28 Feb 2023|Finland|Electronic Components and Equipment

Target: NORDIC LIGHTS GROUP CORPORATION

Bidder: METHODE ELECTRONICS

6 Service Providers

1 Target | 5 Bidder

13 Dealmakers

1 Target | 12 Bidder

£ 116 M

Value

07 Mar 2023|United States|Mortgage Finance

Target: BLACK KNIGHT (LOAN ORIGINATION SYSTEM BUSINESS)

Bidder: CONSTELLATION SOFTWARE INC

6 Service Providers

1 Bidder | 5 Vendor

21 Dealmakers

1 Bidder | 20 Vendor

n/a

Value

22 May 2023|United States|Investment Banking

Target: GREENHILL & CO INC

Bidder: MIZUHO FINANCIAL GROUP INC

8 Service Providers

3 Target | 5 Bidder

30 Dealmakers

14 Target | 16 Bidder

£ 441 M

Value

22 May 2023|Bermuda|Insurance Brokers

Target: VALIDUS RE

Bidder: RENAISSANCERE HOLDINGS LTD

10 Service Providers

5 Bidder | 5 Vendor

74 Dealmakers

51 Bidder | 28 Vendor

£ 2.33 B

Value

01 Jun 2023|United States|Health Care Services

Target: CAREPATHRX HEALTH SYSTEM SOLUTIONS

Bidder: EVERNORTH HEALTH SERVICES

9 Service Providers

5 Bidder | 4 Vendor

24 Dealmakers

17 Bidder | 7 Vendor

n/a

Value

17 Jul 2023|United States|Software

Target: BLACK KNIGHT INC (OPTIMAL BLUE BUSINESS)

Bidder: CONSTELLATION SOFTWARE INC

5 Service Providers

1 Bidder | 4 Vendor

28 Dealmakers

2 Bidder | 26 Vendor

£ 534 M

Value

10 Aug 2023|United States|Luxury Items

Target: CAPRI HOLDINGS

Bidder: TAPESTRY

8 Service Providers

5 Target | 3 Bidder

96 Dealmakers

29 Target | 67 Bidder

£ 6.67 B

Value

11 Oct 2023|United States|FinTech

Target: GREENSKY

Bidder: SIXTH STREET PARTNERS

14 Service Providers

1 Target | 10 Bidder | 3 Vendor

47 Dealmakers

1 Target | 25 Bidder | 21 Vendor

n/a

Value

23 Oct 2023|United States|Integrated Oil and Gas

Target: HESS CORPORATION

Bidder: CHEVRON CORPORATION

10 Service Providers

5 Target | 5 Bidder

59 Dealmakers

29 Target | 30 Bidder

£ 49.32 B

Value

30 Nov 2023|United States|Biotechnology

Target: IMMUNOGEN

Bidder: ABBVIE INC

9 Service Providers

4 Target | 5 Bidder

35 Dealmakers

12 Target | 23 Bidder

£ 7.95 B

Value

27 Oct 2023|United States|IT Services: Other

Target: RTX (CYBERSECURITY & INTELLIGENCE BUSINESS)

Bidder: BLACKSTONE GROUP INC

4 Service Providers

1 Bidder | 3 Vendor

23 Dealmakers

1 Bidder | 22 Vendor

£ 1.07 B

Value

31 Jan 2024|United States|Medical Services

Target: CIGNA (MEDICARE BUSINESSES AND CAREALLIES)

Bidder: HEALTH CARE SERVICE CORPORATION

15 Service Providers

7 Bidder | 8 Vendor

41 Dealmakers

16 Bidder | 25 Vendor

£ 2.60 B

Value

31 Jan 2024|United States|Recreational Products

Target: PGA TOUR INC

Bidder: AMB SPORTS AND ENTERTAINMENT

10 Service Providers

6 Target | 4 Bidder

50 Dealmakers

24 Target | 26 Bidder

£ 2.36 B

Value

19 Feb 2024|United States|Diversified Financials

Target: DISCOVER FINANCIAL SERVICES

Bidder: CAPITAL ONE FINANCIAL CORPORATION

10 Service Providers

6 Target | 4 Bidder

55 Dealmakers

33 Target | 22 Bidder

£ 28.01 B

Value

04 Mar 2024|United States|Chemicals: Diversified

Target: ENTEGRIS (PIPELINE AND INDUSTRIAL MATERIALS BUSINESS)

Bidder: SCF PARTNERS

5 Service Providers

2 Bidder | 3 Vendor

22 Dealmakers

5 Bidder | 17 Vendor

£ 224 M

Value

25 Apr 2024|United States|IT Services: Other

Target: FENICS MARKETS XCHANGE

Bidder: BARCLAYS PLC

7 Service Providers

1 Target | 4 Bidder | 2 Vendor

44 Dealmakers

2 Target | 32 Bidder | 11 Vendor

n/a

Value

16 May 2024|United States|Life Insurance

Target: COREBRIDGE FINANCIAL INC

Bidder: NIPPON LIFE INSURANCE COMPANY

8 Service Providers

2 Target | 3 Bidder | 3 Vendor

43 Dealmakers

20 Target | 7 Bidder | 16 Vendor

£ 3.01 B

Value

02 Oct 2024|United States|Auto Technology

Target: OPENAI

Bidder: NVIDIA CORPORATION

7 Service Providers

2 Target | 5 Bidder

19 Dealmakers

13 Target | 6 Bidder

£ 4.95 B

Value

31 Oct 2024|United States|Venture Capital

Target: RUNWAY GROWTH CAPITAL

Bidder: MOUNT LOGAN CAPITAL

9 Service Providers

5 Target | 4 Bidder

41 Dealmakers

9 Target | 32 Bidder

n/a

Value

25 Nov 2024|United States|Banks

Target: BREMER FINANCIAL CORPORATION

Bidder: OLD NATIONAL BANCORP

10 Service Providers

4 Target | 3 Bidder | 3 Vendor

54 Dealmakers

16 Target | 11 Bidder | 27 Vendor

£ 1.12 B

Value

03 Dec 2024|United States|Banks

Target: AMERICAN NATIONAL BANK

Bidder: UNITED COMMUNITY BANKS INC

6 Service Providers

3 Target | 3 Bidder

10 Dealmakers

1 Target | 9 Bidder

£ 63 M

Value

11 Dec 2024|United States|Recreational Services

Target: MIAMI DOLPHINS

Bidder: OLIVER WEISBERG

4 Service Providers

3 Target | 1 Bidder

10 Dealmakers

8 Target | 2 Bidder

n/a

Value

20 Mar 2025|United States|Entertainment

Target: BOSTON CELTICS

Bidder: WILLIAM CHISHOLM

11 Service Providers

1 Target | 4 Bidder | 6 Vendor

36 Dealmakers

1 Target | 21 Bidder | 14 Vendor

£ 4.70 B

Value

31 Mar 2025|United States|Software

Target: OPENAI

Bidder: SOFTBANK GROUP CORP

6 Service Providers

3 Target | 3 Bidder

38 Dealmakers

18 Target | 20 Bidder

£ 30.90 B

Value

15 May 2025|United States|Apparel Retailers

Target: FOOT LOCKER

Bidder: DICK'S SPORTING GOODS

10 Service Providers

5 Target | 5 Bidder

48 Dealmakers

22 Target | 26 Bidder

£ 1.88 B

Value

21 May 2025|United States|Software

Target: IO PRODUCTS

Bidder: OPENAI

5 Service Providers

3 Target | 2 Bidder

34 Dealmakers

19 Target | 16 Bidder

£ 4.86 B

Value

14 Jul 2025|United States|Banks

Target: VERITEX HOLDINGS

Bidder: HUNTINGTON BANCSHARES

7 Service Providers

3 Target | 4 Bidder

26 Dealmakers

14 Target | 12 Bidder

£ 1.41 B

Value