ARCH CAPITAL GROUP LTD. — Director's Dealing 2015

May 14, 2015

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ARCH CAPITAL GROUP LTD. (ACGL)
CIK: 0000947484
Period of Report: 2015-05-13

Reporting Person: PETRILLO LOUIS T (Officer of Subsidiary)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2015-05-13	Common Shares, $.0033 par value per share	F	1444	$62.505	Disposed	57608	Direct
2015-05-13	Common Shares, $.0033 par value per share	A	7000	—	Acquired	64608	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2015-05-13	Stock Option (right to buy)	$62.505	A	7000	Acquired	2025-05-13	Common Shares, $.0033 per share (7000)	Direct

Footnotes

F1: Represents shares withheld to pay taxes due upon vesting of restricted stock.

F2: Represents restricted shares that vest in three equal annual installments on May 13th in each of 2016, 2017 and 2018, subject to the applicable award agreement.

F3: The stock option will become exercisable in three equal annual installments, with the first installment becoming exercisable on May 13, 2016 and the next two installments on May 13, 2017 and May 13, 2018, subject to the applicable award agreement.