The Board, without further stockholder authorization, may authorize the issuance from time to time of up to 1,000,000 shares of the Company’s preferred stock. Of the 1,000,000 shares of preferred stock, as of September 30, 2023, 370,000 shares were designated as Series H, par value $0.001 per share, 160,000 shares were designated as Series J, par value $0.001 per share, and 125,000 shares were designated as Series I, par value $0.001 per share.

On September 13, 2023, the Company consummated the sale of 75,000 Units (the "Units") with each Unit consisting of (A) one share of BIOLASE Series J Convertible Redeemable Preferred Stock, par value $0.001 per share and a stated value equal to $100.00 (the “Series J Convertible Preferred Stock”), and (B) one warrant (the “Series J Warrants”) to purchase one-half of one (0.50) share of Series J Convertible Preferred Stock, at a price to the public of $60.00 per Unit, less underwriting discounts and commissions. The public offering price of $60.00 per Unit reflects the issuance of the Series J Convertible Preferred Stock with an original issue discount of 40%. The Company filed a registration statement on Form S-1 in September 2023, which registered the Units, the Series J Convertible Preferred Stock, the Series J Warrants and the shares of Series J Convertible Preferred Stock and common stock underlying such securities and additional shares of Series J Convertible Preferred Stock that will be issued, if and when the Board declares such dividends, as paid in-kind dividends (“PIK dividends”) at a rate of 20% per annum and the shares of Common Stock issuable upon conversion of the Series J Convertible Preferred Stock issued as PIK dividends. The registration statement was declared effective on September 13, 2023 and the offering closed on September 18, 2023. Each Warrant has an exercise price of $30.00 per share, is exercisable for one-half of one (0.5) share of Series J Convertible Preferred Stock, is immediately exercisable and will expire one (1) year from the date of issuance.

Each share of Series J Convertible Preferred Stock is convertible at the option of the holder at any time into the number of shares of BIOLASE common stock determined by dividing the $100.00 stated value per share by a conversion price of $3.26. Each outstanding share of Series J Convertible Preferred Stock is mandatorily redeemable by the Company in cash on September 13, 2024 (the "Series J Maturity Date").

Gross proceeds from the offering were $4.5 million before broker fees and related expenses of approximately $1.0 million. In accordance with applicable accounting standards, the $4.5 million gross proceeds were allocated to the Series J Convertible Preferred

Stock and the Series J Warrants in the amount of $3.5 million and $1.0 million, respectively. The allocation was based on the fair value of the Series J Warrants of $1.0 million as of the commitment date, with the residual proceeds of $3.5 million allocated to the Series J Convertible Preferred Stock. Net proceeds allocated to the Series J Convertible Preferred Stock and Series J warrants was $2.7 million and $0.8 million respectively.

The Series J Convertible Preferred stock was classified as mezzanine equity on the consolidated balance sheet as they are contingently redeemable prior to the Series J Maturity Date and the conversion from preferred shares to shares of BIOLASE common stock is at the option of the holder at any time before the Series J Maturity Date. The Series J warrants were classified as accrued liabilities on the consolidated balance sheet as the warrants are convertible into preferred shares, which are mandatorily redeemable in cash upon the Series J Maturity Date if they are not converted to shares of BIOLASE common stock before such date.

The Series J Convertible Preferred Stock was issued at a discount with the total redemption value of the Series J Convertible Preferred Shares and PIK Dividends of $10.3 million. The redemption value in excess of the net proceeds received allocated to the Series J Convertible Preferred Shares was $7.6 million and was recognized as a decrease in additional paid-in-capital at the commitment date. Upon conversion of Series J warrants to Series J Convertible Preferred shares, the value of the Series J Convertible Preferred shares issued is the stated value per share plus the PIK dividend. The redemption value in excess of the net proceeds received from the exercise of warrants and the fair value of such warrants is recognized as a decrease in additional paid-in-capital at the conversion date.

During the three months ended September 30, 2023, 5,960 of the Series J warrants were converted to 2,980 Series J Convertible Preferred shares and during the three months ended September 30, 2023, 39,849 Series J Convertible Preferred shares were converted to BIOLASE common stock.

On May 24, 2023, the Company consummated the sale of 175,000 Units (the "Units") with each Unit consisting of (A) one share of BIOLASE Series H Convertible Redeemable Preferred Stock, par value $0.001 per share and a stated value equal to $50.00 (the “Series H Convertible Preferred Stock”), and (B) one warrant (the “Series H Warrants”) to purchase one-half of one (0.50) share of Series H Convertible Preferred Stock, at a price to the public of $26.00 per Unit, less underwriting discounts and commissions. The public offering price of $26.00 per Unit reflects the issuance of the Series H Convertible Preferred Stock with an original issue discount of 48%. The Company filed a registration statement on Form S-1 in May 2023, which registered the Units, the Series H Convertible Preferred Stock, the Series H Warrants and the shares of Series H Convertible Preferred Stock and common stock underlying such securities and additional shares of Series H Convertible Preferred Stock that will be issued, if and when the Board declares such dividends, as paid in-kind dividends (“PIK dividends”) at a rate of 20% and the shares of Common Stock issuable upon conversion of the Series H Convertible Preferred Stock issued as PIK dividends. The registration statement was declared effective on May 24, 2023 and the offering closed on May 26, 2023. Each Warrant has an exercise price of $13.00 per share, is exercisable for one-half of one (0.5) share of Series H Convertible Preferred Stock, is immediately exercisable and will expire two (2) years from the date of issuance.

Each share of Series H Convertible Preferred Stock is convertible at the option of the holder at any time into the number of shares of BIOLASE common stock determined by dividing the $50.00 stated value per share by a conversion price of $13.98 (as adjusted for the 2023 Reverse Stock Split). Each outstanding share of Series H Convertible Preferred Stock is mandatorily redeemable by the Company in cash on May 24, 2025 (the "Series H Maturity Date").

Gross proceeds from the offering were $4.6 million before broker fees and related expenses of approximately $0.9 million. In accordance with applicable accounting standards, the $4.6 million gross proceeds were allocated to the Series H Convertible Preferred Stock and the Series H Warrants in the amount of $3.4 million and $1.2 million, respectively. The allocation was based on the fair value of the Series H Warrants of $1.2 million as of the commitment date, with the residual proceeds of $3.4 million allocated to the Series H Convertible Preferred Stock. Net proceeds allocated to the Series H Convertible Preferred Stock and Series H warrants was $2.7 million and $1.0 million respectively.

The Series H Convertible Preferred stock was classified as mezzanine equity on the consolidated balance sheet as they are contingently redeemable prior to the Series H Maturity Date and the conversion from preferred shares to shares of BIOLASE common stock is at the option of the holder at any time before the Series H Maturity Date. The Series H warrants were classified as accrued liabilities on the consolidated balance sheet as the warrants are convertible into preferred shares, which are mandatorily redeemable in cash upon the Series H Maturity Date if they are not converted to shares of BIOLASE common stock before such date.

The Series H Convertible Preferred Stock was issued at a discount with the total redemption value of the Series H Convertible Preferred Shares and PIK Dividends of $10.5 million. The redemption value in excess of the net proceeds received allocated to the Series H Convertible Preferred Shares was $7.8 million and was recognized as a decrease in additional paid-in-capital at the commitment date. Upon conversion of Series H warrants to Series H Convertible Preferred shares, the value of the Series H Convertible Preferred shares issued is the stated value per share plus the PIK dividend. The redemption value in excess of the net proceeds received from the exercise of warrants and the fair value of such warrants is recognized as a decrease in additional paid-in-capital at the conversion date.

During the nine months ended September 30, 2023, 40,000 of the Series H warrants were converted to 20,000 Series H Convertible Preferred shares and during the three and nine months ended September 30, 2023, 7,000 and 190,000 Series H Convertible Preferred shares were converted to BIOLASE common stock, respectively.

The mezzanine classified Series H Convertible Preferred Stock are presented at their maximum redemption value that includes accretion related to the PIK dividends. During the three months ended September 30, 2023, the Company determined a revision was necessary in its accounting for the redemption value of the PIK dividends related to its Series H Convertible Preferred Stock. This revision would have increased additional paid in capital and reduced mezzanine equity at the time of issuance by approximately $1.6 million. Due to conversions, the impact was immaterial as of June 30, 2023, and September 30, 2023. The Company has modified the disclosures related to the Series H Convertible Preferred Stock within the Consolidated Statements of Convertible Redeemable Preferred Stock and Stockholders' Equity for the nine months ended September 30, 2023, to reflect the revision.

On June 5, 2023, the Board declared a dividend of one one-thousandth of a share of Series I Preferred Stock, par value $0.001 per share ("Series I Preferred Stock"), for each share of BIOLASE common stock outstanding as of June 16, 2023 (as calculated on a pre 2023 Reverse Stock Split basis). The certificate of designation for the Series I Preferred Stock provided that all shares of Series I Preferred Stock not present in person or by proxy at any meeting of stockholders held to vote on the 2023 Reverse Stock Split immediately prior to the opening of the polls at such meeting would be automatically redeemed (the “Series I Initial Redemption”) and that any outstanding shares of Series I Preferred Stock that have not been redeemed pursuant to the Series I Initial Redemption would be redeemed in whole, but not in part, (i) if and when ordered by the Board or (ii) automatically upon the effectiveness of the amendment to the Certificate of Incorporation effecting the 2023 Reverse Stock Split that was subject to the vote (the "Series I Subsequent Redemption"). On July 20, 2023, the Series I Initial Redemption occurred, and on July 27, 2023, the Series I Subsequent Redemption occurred. As a result, no shares of Series I Preferred Stock remain outstanding as of July 27, 2023.

On March 1, 2022, the Board declared a dividend of one one-thousandth of a share of Series G Preferred Stock, par value $0.001 per share ("Series G Preferred Stock"), for each share of BIOLASE common stock outstanding as of close of market on March 25, 2022 (as calculated on a pre 2022 Reverse Stock Split basis). The certificate of designation for the Series G Preferred Stock provided that all shares of Series G Preferred Stock not present in person or by proxy at the 2022 Annual Meeting immediately prior to the opening of the polls at the 2022 Annual Meeting would be automatically redeemed (the “Series G Initial Redemption”) and that any outstanding shares of Series G Preferred Stock that have not been redeemed pursuant to the Series G Initial Redemption would be redeemed in whole, but not in part, (i) if and when ordered by the Board or (ii) automatically upon the effectiveness of the amendment to the Certificate of Incorporation effecting the 2022 Reverse Stock Split that was subject to the vote at the 2022 Annual Meeting (the “Series G Subsequent Redemption”). On April 28, 2022, both the Series G Initial Redemption and the Series G Subsequent Redemption occurred. As a result, no shares of Series G Preferred Stock remain outstanding. On June 6, 2022, the Series G Preferred Stock was eliminated.

On July 23, 2020, the Company consummated the sale of an aggregate of 18,000 shares of Series F Preferred Stock, par value $0.001 per share ("Series F Preferred Stock"), and 45,000,000 warrants (the “July 2020 Warrants”), exercisable for 18,000 shares of BIOLASE common stock, through a registered rights offering the Company completed on July 22, 2020 (the “Rights Offering”). Each share of Series F Preferred Stock was convertible at the Company’s option at any time on or after July 22, 2021 or at the option of the holder at any time, into the number of shares of BIOLASE common stock determined by dividing the $1,000 stated value per share of the Series F Preferred Stock by a conversion price of $1,000 per share. Each share of Series F Preferred Stock was convertible into one share of common stock, and 2,500 July 2020 Warrants entitled the holder thereof to purchase one share BIOLASE common stock at an exercise price of $1,000 per share.

In accordance with applicable accounting standards, the $18.0 million gross proceeds from the Rights Offering were allocated to the Series F Preferred Stock and the July 2020 Warrants in the amount of $2.7 million and $15.3 million, respectively. The allocation was based on the fair value of the July 2020 Warrants of $15.3 million as of the commitment date, with the residual proceeds of $2.7 million allocated to the Series F Preferred Stock.

The Series F Preferred Stock contained a beneficial conversion feature which resulted in a deemed dividend to preferred stockholders of approximately $2.7 million, upon immediate accretion. Additionally, the July 2020 Warrants were recognized as a discount to the Series F Preferred Stock. Upon conversion, including the conversion described below, this discount was accreted and also recognized as a deemed dividend to preferred stockholders in the amount of $0.2 million, $0.5 million and $14.7 million for the years ended December 31, 2022, 2021, and 2020, respectively.

The remaining shares of Series F Preferred Stock were converted into shares of BIOLASE common stock in the first quarter of 2022 with none outstanding as of September 30, 2023 and December 31, 2022. On March 3, 2022, the Series F Preferred Stock was eliminated.

The 2002 Stock Incentive Plan (as amended effective as of May 26, 2004, November 15, 2005, May 16, 2007, May 5, 2011, June 6, 2013, October 30, 2014, April 27, 2015, and May 6, 2017, the “2002 Plan”) was replaced by the 2018 Plan (as defined below) with respect to future equity awards. Persons eligible to receive awards under the 2002 Plan included officers, employees, directors of the Company, and consultants to the Company. As of September 30, 2023, a total of 1,244 shares have been authorized for issuance under the 2002 Plan, of which approximately 908 shares of BIOLASE common stock have been issued pursuant to options that were exercised and restricted stock units ("RSUs") that were vested, approximately 159 shares of common stock have been reserved for options that are outstanding, and no shares of common stock remain available for future grants.

At the 2018 annual meeting of stockholders, the Company’s stockholders approved the 2018 Long-Term Incentive Plan (as amended effective as of September 21, 2018, May 15, 2019, May 13, 2020, June 11, 2021, and April 27, 2023, the “2018 Plan”). The purposes of the 2018 Plan are (i) to align the interests of the Company’s stockholders and recipients of awards under the 2018 Plan by increasing the proprietary interest of such recipients in the Company’s growth and success; (ii) to advance the interests of the Company by attracting and retaining non-employee directors, officers, other employees, consultants, independent contractors, and agents; and (iii) to motivate such persons to act in the long-term best interests of the Company and its stockholders.

Under the terms of the 2018 Plan, approximately 42,212 shares of BIOLASE common stock remain available for issuance as of September 30, 2023. As of September 30, 2023, a total of 112,268 shares of common stock have been authorized for issuance under the 2018 Plan, of which approximately 5,797 shares have already been issued and approximately 62,079 shares of the Company’s common stock have been reserved for issuance upon the exercise of outstanding options or stock appreciation rights ("SARs"), and/or settlement of unvested RSUs or phantom awards under the 2018 Plan.

The Company recognized stock-based compensation expense of $0.3 million and $1.1 million for the three and nine months ended September 30, 2023, respectively, and $0.6 million and $1.7 million for the three and nine months ended September 30, 2022, respectively. As of September 30, 2023 and 2022, the Company had approximately $0.7 million and $1.8 million, respectively, of total unrecognized compensation expense, net of estimated forfeitures, related to unvested share-based compensation arrangements. The Company expects that expense to be recognized over a weighted-average period of 1.0 years.

The following table summarizes the statement of operations classification of compensation expense associated with share-based payments (in thousands):


	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2023		2022		2023		2022
Cost of revenue	$	7	$	20	$	30	$	133
Sales and marketing		46		136		347		448
General and administrative		198		403		603		927
Engineering and development		25		32		70		183
Total	$	276	$	591	$	1,050	$	1,691

A summary of option activity for the nine months ended September 30, 2023 is as follows (in thousands, except per share data):


			Weighted		Weighted Average Remaining
			Average		Contractual		Aggregate
	Shares		Exercise Price		Term (Years)		Intrinsic Value (1)
Options outstanding as of December 31, 2022		1	$	7,254.45		5.8	$	—
Forfeited, cancelled, or expired (2)		—	$	12,184.46		—	$	—
Options outstanding as of September 30, 2023		1	$	6,445.54		5.3	$	—
Options exercisable as of September 30, 2023		1	$	6,445.54		5.3	$	—
Vested options expired during the period ended September 30, 2023		—	$	—

A summary of unvested stock option activity for the nine months ended September 30, 2023 is as follows (in thousands, except per share data):


			Weighted
			Average Grant
	Shares (1)		Date Fair Value
Unvested options as of December 31, 2022		—	$	1,229.99
Vested		—	$	1,229.99
Unvested options as of September 30, 2023		—	$	-

(1)

Rounded to less than 1,000 shares as adjusted for the 2023 reverse stock split.

Fair value disclosures related to grants, exercises and vested options are as follows (in thousands, except per share amounts):


	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2023		2022		2023		2022
Total fair value of stock options vested during the period	$	—	$	12	$	1	$	35

Stock Option Activity

There were no option grants or exercises during the three and nine months ended September 30, 2023 and 2022.

A summary of unvested RSU activity for the nine months ended September 30, 2023 is as follows (in thousands, except per share amounts):


				Weighted
				Average Grant
	Shares			Date Fair Value
Unvested RSUs as of December 31, 2022		4		$	525.72
Granted		56		$	11.46
Vested		(8	)	$	192.09
Forfeited or cancelled		(2	)	$	116.41
Unvested RSUs as of September 30, 2023		50		$	19.80

The Company issues warrants to acquire shares of BIOLASE common stock as approved by the Board.

On September 13, 2023, the Company entered into the Underwriting Agreement, pursuant to which the Company agreed to sell in a firm commitment underwritten public offering 75,000 units, with each Unit consisting of (A) one share of the Company’s Series J Convertible Redeemable Preferred Stock, par value $0.001 per share (the “Series J Convertible Preferred Stock”), and (B) one warrant to purchase one-half of one (0.50) share of Series J Convertible Preferred Stock, at a price to the public of $60.00 per Unit, less underwriting discounts and commissions. Each Warrant has an exercise price of $30.00 per share, is exercisable for one-half of one (0.5) share of Series J Convertible Preferred Stock, is immediately exercisable and will expire one (1) year from the date of issuance.

Based on the terms and conditions of the September 2023 public offering, the Company determined that liability classification was appropriate for the warrants and recognized the gross proceeds from the issuance allocated to the warrants in excess of par of $1.0 million in accrued liabilities and expensed issuance costs of $0.2 million allocated to the warrants.

On May 24, 2023, the Company entered into the Underwriting Agreement, pursuant to which the Company agreed to sell in a firm commitment underwritten public offering 175,000 units, with each Unit consisting of (A) one share of the Company’s Series H Convertible Redeemable Preferred Stock, par value $0.001 per share (the “Series H Convertible Preferred Stock”), and (B) one warrant to purchase one-half of one (0.50) share of Series H Convertible Preferred Stock, at a price to the public of $26.00 per Unit, less underwriting discounts and commissions. Each Warrant has an exercise price of $13.00 per share, is exercisable for one-half of one (0.5) share of Series H Convertible Preferred Stock, is immediately exercisable and will expire two (2) years from the date of issuance.

Based on the terms and conditions of the May 2023 public offering, the Company determined that liability classification was appropriate for the warrants and recognized the gross proceeds from the issuance allocated to the warrants in excess of par of $1.2 million in accrued liabilities and expensed issuance costs of $0.2 million allocated to the warrants.

On January 9, 2023, the Company completed a public offering, pursuant to which the Company agreed to issue, in a registered direct offering, 171,678 shares of BIOLASE common stock, par value $0.001 per share, and pre-funded warrants to purchase 114,035 shares of BIOLASE common stock with an exercise price of $1.00 per share. The purchase price for one share of common stock was determined to be $35.00, and the purchase price for one January 2023 Pre-Funded Warrant was determined to be $34.00. The Company received aggregate gross proceeds from the transactions of approximately $9.9 million, before deducting underwriting discounts and commissions and other transaction expenses paid by the Company.

Based on the terms and conditions of the January 2023 public offering, the Company determined that equity classification was appropriate for the pre-funded warrants and recognized the net proceeds from the issuance of common stock and pre-funded warrants in excess of par of $8.5 million in additional paid-in capital.

On June 27, 2022, the Company entered into a Securities Purchase Agreement with certain accredited institutional investors, pursuant to which the Company agreed to issue to the Purchasers (as defined therein), (i) in a registered direct offering, 6,787 shares of BIOLASE common stock, and pre-funded warrants to purchase 7,266 shares of BIOLASE common stock (the “June 2022 Pre-Funded Warrants”) with an exercise price of $0.1 per share, and (ii) in a concurrent private placement, warrants to purchase 14,054 shares of BIOLASE common stock (each a "Common Warrant" and together with the June 2022 Pre-Funded Warrants, the “June 2022 Warrants”). The combined purchase price for one share of BIOLASE common stock and one Common Warrant was $462.5, and the combined purchase price for one June 2022 Pre-Funded Warrant and one Common Warrant was $462.4. In the offering and concurrent private placement, the Company received aggregate gross proceeds of approximately $6.5 million before deducting fees to the placement agent and other transaction expenses.

Based on the terms and conditions of the June 2022 Warrants, the Company determined that equity classification was appropriate and recognized the net proceeds in excess of par of $5.6 million in additional paid-in capital.

A summary of the share equivalent of warrant activity for the nine months ended September 30, 2023 is as follows (in thousands, except exercise price amounts):


				Weighted
				Average
	Shares			Exercise Price
Warrants outstanding as of December 31, 2022		21		$	656.23
Granted or Issued		1,577		$	24.53
Exercised		(277	)	$	13.67
Warrants outstanding as of September 30, 2023		1,321		$	36.82
Warrants exercisable as of September 30, 2023		1,321		$	36.82
Vested warrants expired during the period ended September 30, 2023		—		$	—

Since March 31, 2021, the Company has issued 4,401 phantom RSUs in lieu of stock-settled RSUs historically granted for leadership bonuses and non-employee director service. The phantom RSUs have either time-based or performance-based vesting conditions and could be settled in cash in 2024 with the Company's option to settle the award in BIOLASE common stock at the sole discretion of the Board. At inception, these phantom RSUs were included as a component of long-term liability on the consolidated balance sheet and were not considered stock-based compensation due to the cash-settlement feature of the award and the then current limitation on the number of remaining shares authorized for issuance. In 2022, as a result of the 2022 Reverse Stock Split, the phantom awards were reclassed to equity and included as a component of additional paid-in-capital in the amount of $0.1 million, with a portion remaining as a component of long-term liability on the consolidated balance sheet due to certain guaranteed minimums, and the expense subsequent to the remeasurement date considered stock-based compensation. The expense recognized during the three and nine months ended September 30, 2023 was $0.1 million and $0.3 million, respectively, and the expense recognized during the three and nine months ended September 30, 2022 was $0.1 million. As of September 30, 2023, $0.5 million was included in accrued liabilities and $0.2 million was included in additional paid-in-capital on the consolidated balance sheet. The balance included in long-term liabilities and additional paid-in-capital as of December 31, 2022, was $0.3 million and $0.1 million, respectively.

During the year ended December 31, 2021, the Company issued approximately 386 SARs in lieu of stock-settled RSUs historically granted for non-employee director service. Upon exercise, the SARs could be settled in cash with the Company's option to settle in BIOLASE common stock at the sole discretion of the Board. These SARS were included in accrued liabilities on the consolidated balance sheet and not considered stock-based compensation due to the cash-settlement feature of the award and limitation on the number of remaining shares authorized for issuance. In 2022, as a result of the 2022 Reverse Stock Split, the SARs were reclassed to equity and included as a component of additional paid-in-capital on the consolidated balance sheet in the amount of $0.5 million. These SARs were fully vested in 2022. No expense was recognized during the three and nine months ended September 30, 2023. No expense was recognized during the three months ended September 30, 2022, and the expense recognized during the nine months ended September 30, 2022 was $0.3 million and was included in additional paid-in-capital on the consolidated balance sheet as of December 31, 2022.

Basic net loss per share is computed by dividing net loss attributable to common stockholders by the weighted-average number of shares of BIOLASE common stock outstanding for the period. In computing diluted net loss per share, the weighted average number of shares of common stock outstanding is adjusted to reflect the effect of potentially dilutive securities. Net loss is adjusted for any deemed dividends to preferred stockholders to compute net income attributable to common stockholders. The January 2023 Pre-Funded Warrants were included in the calculation of basic and diluted loss per share for the three and nine months ended September 30, 2023 as the underlying warrant shares are issuable for little or no cash consideration.

Outstanding stock options, RSUs, preferred shares, and warrants to purchase approximately 2,537,031 and 26,480 shares were not included in the calculation of diluted loss per share amounts for the periods ended September 30, 2023 and September 30, 2022, respectively, as their effect would have been anti-dilutive.