The Compensation Committee may grant various equity-based awards, including RSUs, restricted stock, stock options, LPUs and shares of BGC Class A common stock. Upon vesting of RSUs, issuance of restricted stock, exercise of stock options and redemption/exchange of LPUs, the Company generally issues new shares of BGC Class A common stock.

On June 22, 2016, at the annual meeting of stockholders, the stockholders approved the Equity Plan to increase from 350 million to 400 million the aggregate number of shares of BGC Class A common stock that may be delivered or cash-settled pursuant to awards granted during the life of the Equity Plan. As of June 30, 2020, the limit on the aggregate number of shares authorized to be delivered allowed for the grant of future awards relating to 129.6 million shares.

The Company incurred compensation expense related to Class A common stock, LPUs and RSUs held by BGC employees as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Issuance of common stock and grants of exchangeability	$	2,362	$	25,587	$	25,396	$	29,123
Allocations of net income¹		2,660		4,780		3,939		9,326
LPU amortization		19,524		10,689		35,833		13,734
RSU amortization		3,273		2,696		4,855		3,710
Equity-based compensation and allocations of net income to limited partnership units and FPUs	$	27,819	$	43,752	$	70,023	$	55,893

A summary of the activity associated with LPUs held by BGC employees is as follows (in thousands):

	BGC LPUs			Newmark LPUs²
Balance at December 31, 2019		102,407			14,607
Granted		36,024			—
Redeemed/exchanged units		(3,717	)		(301	)
Forfeited units		(2	)		—
Balance at June 30, 2020		134,712			14,306

The LPUs table above includes both regular and Preferred Units. The Preferred Units are not entitled to participate in partnership distributions other than with respect to the Preferred Distribution (see Note 2—“Limited Partnership Interests in BGC Holdings and Newmark Holdings” for further information on Preferred Units). A summary of the BGC Holdings and Newmark Holdings LPUs held by BGC employees is as follows (in thousands):

	BGC LPUs		Newmark LPUs
Regular Units		92,471		10,192
Preferred Units		42,241		4,114
Balance at June 30, 2020		134,712		14,306

Compensation expense related to the issuance of BGC or Newmark Class A common stock and grants of exchangeability on BGC Holdings and Newmark Holdings LPUs held by BGC employees is as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Issuance of common stock and grants of exchangeability	$	2,362	$	25,587	$	25,396	$	29,123

BGC LPUs held by BGC employees may become exchangeable or redeemed for BGC Class A common stock on a one-for-one basis, and Newmark LPUs held by BGC employees may become exchangeable or redeemed for a number of shares of Newmark Class A common stock equal to the number of limited partnership interests multiplied by the then-current Exchange Ratio. As of June 30, 2020, the Exchange Ratio was 0.9366.

A summary of the LPUs redeemed in connection with the issuance of BGC Class A common stock or Newmark Class A common stock (at the then-current Exchange Ratio) or granted exchangeability for BGC Class A common stock or Newmark Class A common stock (at the then-current Exchange Ratio) held by BGC employees is as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
BGC Holdings LPUs		471		5,101		4,473		5,621
Newmark Holdings LPUs		100		171		291		342
Total		571		5,272		4,764		5,963

As of June 30, 2020 and December 31, 2019, the number of share-equivalent BGC LPUs exchangeable for shares of BGC Class A common stock at the discretion of the unit holder held by BGC employees was 3.9 million and 3.1 million, respectively. As of June 30, 2020 and December 31, 2019, the number of Newmark LPUs exchangeable into shares of Newmark Class A common stock at the discretion of the unit holder held by BGC employees (at the then-current Exchange Ratio) was 0.6 million and 0.8 million, respectively.

Compensation expense related to the amortization of LPUs held by BGC employees is as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Stated vesting schedule	$	18,459	$	10,686	$	34,736	$	14,192
Post-termination payout		1,065		3		1,097		(458	)
LPU amortization	$	19,524	$	10,689	$	35,833	$	13,734

There are certain LPUs that have a stated vesting schedule and do not receive quarterly allocations of net income. These LPUs generally vest between two and five years from the date of grant. The fair value is determined on the date of grant based on the market value of an equivalent share of BGC or Newmark Class A common stock (adjusted if appropriate based upon the award’s eligibility to receive quarterly allocations of net income), and is recognized as compensation expense, net of the effect of estimated forfeitures, ratably over the vesting period.

A summary of the outstanding LPUs held by BGC employees with a stated vesting schedule that do not receive quarterly allocations of net income is as follows (in thousands):

	June 30, 2020		December 31, 2019
BGC Holdings LPUs		42,782		30,699
Newmark Holdings LPUs		446		1,171

Aggregate estimated grant date fair value – BGC and Newmark Holdings LPUs	$	195,689	$	138,324

As of June 30, 2020, there was approximately $102.8 million of total unrecognized compensation expense related to unvested BGC and Newmark LPUs held by BGC employees with a stated vesting schedule that do not receive quarterly allocations of net income that is expected to be recognized over 1.98 years.

Compensation expense related to LPUs held by BGC employees with a post-termination pay-out amount, such as REUs, and/or a stated vesting schedule is recognized over the stated service period. These LPUs generally vest between two and five years from the date of grant. As of June 30, 2020, there were 1.3 million outstanding BGC LPUs with a post-termination payout, with a notional value of approximately $16.0 million and an aggregate estimated fair value of $7.4 million, and 0.1 million outstanding Newmark LPUs with a post-termination payout, with a notional value of approximately $0.9 million and an aggregate estimated fair value of $0.2 million. As of December 31, 2019, there were 1.2 million outstanding BGC LPUs with a post-termination payout, with a notional value of approximately $15.3 million and an aggregate estimated fair value of $10.0 million, and 0.1 million outstanding Newmark LPUs with a post-termination payout, with a notional value of approximately $1.0 million and an aggregate estimated fair value of $0.2 million.

Compensation expense related to RSUs held by BGC employees is as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
RSU amortization	$	3,273	$	2,696	$	4,855	$	3,710

A summary of the activity associated with RSUs held by BGC employees and directors is as follows (RSUs and dollars in thousands):

	RSUs			Weighted- Average Grant Date Fair Value		Fair Value Amount			Weighted- Average Remaining Contractual Term (Years)
Balance at December 31, 2019		4,478		$	5.25	$	23,516			2.50
Granted		4,433			3.73		16,536
Delivered units		(1,224	)		5.79		(7,086	)
Forfeited units		(161	)		4.61		(744	)
Balance at June 30, 2020		7,526		$	4.28	$	32,222			2.84

The fair value of RSUs held by BGC employees and directors is determined on the date of grant based on the market value of Class A common stock adjusted as appropriate based upon the award’s ineligibility to receive dividends. The compensation expense is recognized ratably over the vesting period, taking into effect estimated forfeitures. The Company uses historical data, including historical forfeitures and turnover rates, to estimate expected forfeiture rates for both employee and director RSUs. Each RSU is settled in one share of Class A common stock upon completion of the vesting period.

For the RSUs that vested during the three months ended June 30, 2020 and 2019, the Company withheld shares of Class A common stock valued at $40 thousand and $32 thousand to pay taxes due at the time of vesting. For the RSUs that vested during the six months ended June 30, 2020 and 2019, the Company withheld shares of Class A common stock valued at $1.7 million and $0.5 million to pay taxes due at the time of vesting. As of June 30, 2020, there was approximately $30.0 million of total unrecognized compensation expense related to unvested RSUs held by BGC employees and directors that is expected to be recognized over a weighted-average period of 2.84 years.

In connection with certain of its acquisitions, the Company has granted certain LPUs and RSUs. As of June 30, 2020 and December 31, 2019, the aggregate estimated fair value of these acquisition-related LPUs and RSUs was $9.0 million and $10.7 million, respectively. The liability for such acquisition-related awards is included in “Accounts payable, accrued and other liabilities” on the Company’s unaudited condensed consolidated statements of financial condition.

BGC employees hold shares of BGC and Newmark restricted stock. Such restricted shares are generally saleable by partners in five to ten years. Partners who agree to extend the length of their employment agreements and/or other contractual modifications sought by the Company are expected to be able to sell their restricted shares over a shorter time period. Transferability of the restricted shares of stock is not subject to continued employment or service with the Company or any affiliate or subsidiary of the Company; however, transferability is subject to compliance with BGC and its affiliates’ customary noncompete obligations.

During both the three and six months ended June 30, 2020 and 2019, no BGC or Newmark restricted shares held by BGC employees were forfeited in connection with this provision. During the three months ended June 30, 2020 and 2019, the Company released the restrictions with respect to 0.2 million and 0.2 million of such BGC shares held by BGC employees, respectively. During the six months ended June 30, 2020 and 2019, the Company released the restrictions with respect to 0.3 million and 0.5 million of such BGC shares held by BGC employees, respectively. As of June 30, 2020 and December 31, 2019, there were 5.6 million and 6.4 million of such restricted BGC shares held by BGC employees outstanding, respectively. Additionally, during the three months ended June 30, 2020 and 2019, Newmark released the restrictions with respect to 0.1 million and 0.1 million, respectively, of restricted Newmark shares held by BGC employees. Additionally, during the six months ended June 30, 2020 and 2019, Newmark released the restrictions with respect to 0.1 million and 0.2 million, respectively, of restricted Newmark shares held by BGC employees.

The Company maintains a deferred cash award program, which provides for the grant of deferred cash incentive compensation to eligible employees. The Company may pay certain bonuses in the form of deferred cash compensation awards, which generally vest over a future service period.

The total compensation expense recognized in relation to the deferred cash compensation awards for the three months ended June 30, 2020 and 2019 was $0.2 million and $0.6 million, respectively. The total compensation expense recognized in relation to the deferred cash compensation awards for the six months ended June 30, 2020 and 2019 was $0.4 million and $0.6 million, respectively. As of June 30, 2020 and December 31, 2019, the total liability for the deferred cash compensation awards was $1.8 million and $3.5 million, respectively, which is included in “Accrued compensation” on the Company’s unaudited condensed consolidated statements of financial condition. As of June 30, 2020, total unrecognized compensation cost related to deferred cash compensation, prior to the consideration of forfeitures, was approximately $0.8 million and is expected to be recognized over a weighted-average period of 1.53 years.