David A. Wilson - May 18, 2021 Form 4 Insider Report for CoreSite Realty Corp (COR)

Role: Director
Signature: /s/ Derek S. McCandless, Attorney-in-Fact
Stock symbol: COR
Transactions as of: May 18, 2021
Transactions value $: $0
Form type: 4
Date filed: 5/20/2021, 09:23 PM
Next filing: Jul 19, 2021

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	COR	Common Stock	Options Exercise	$0	+1.5K	+17.1%	$0.00	10.3K	May 18, 2021	Direct

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	COR	Restricted Stock Units	Options Exercise	$0	-1.5K	-6.65%	$0.00	21K	May 18, 2021	Common Stock	1.5K		Direct	F1, F2, F3
transaction	COR	Restricted Stock Units	Award	$0	+1.47K	+7%	$0.00	22.5K	May 19, 2021	Common Stock	1.47K		Direct	F1, F3, F4

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Each Restricted Stock Unit ("RSU") represents the right to receive one share of common stock of the issuer. The reporting person also holds a tandem dividend equivalent for each RSU held, which gives the reporting person the right to receive, upon the payment of any ordinary quarterly cash dividend paid to holders of common stock of the issuer, an equivalent payment in the form of additional RSUs based on the fair market value of the issuer's common stock on the date of payment.
F2	The RSUs vested in full on May 18, 2021.
F3	The RSUs have no expiration date.
F4	The RSUs vest on the earlier of (a) May 19, 2022 or (b) the day before the issuer's next annual meeting of stockholders. The RSUs are payable upon vesting.