NEPH

SEC source: 0001062993-23-000720 · form4.xml · nonDerivative · entry 1

Spandow Oliver J. · CIK 0001749836 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 67,310

F1 · shares: Represents shares of restricted stock granted to the reporting person in lieu of cash fees payable to the reporting person for his service on the Company's Board of Directors for 2022. These shares of restricted stock vest 6 months following the grant date.

SEC source: 0001062993-23-000719 · form4.xml · derivative · entry 6

Gwydir Tom · CIK 0001775308 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,080

Underlying: Common Stock · 7,080 shares

Expires 2023-01-05

F4 · derivative.exercise_date: Represents options granted to the reporting person for his service on the Company's Board of Directors for 2022. This option vests as to 2,360 shares on each of 1/5/23, 1/5/24 and 1/5/25.

SEC source: 0001062993-23-000719 · form4.xml · nonDerivative · entry 1

Gwydir Tom · CIK 0001775308 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 43,226

F1 · shares: Represents shares of restricted stock granted to the reporting person in lieu of cash fees payable to the reporting person for his service on the Company's Board of Directors for 2022. These shares of restricted stock vest 6 months following the grant date.

SEC source: 0001062993-23-000717 · form4.xml · derivative · entry 3

Harris Joseph Michael · CIK 0001946070 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,080

Underlying: Common Stock · 7,080 shares

Expires 2033-01-05

F3 · derivative.exercise_date: Represents options granted to the reporting person for his service on the Company's Board of Directors for 2022. This option vests as to 2,360 shares on each of 1/5/23, 1/5/24 and 1/5/25.

F3 · ownership.direct: Represents options granted to the reporting person for his service on the Company's Board of Directors for 2022. This option vests as to 2,360 shares on each of 1/5/23, 1/5/24 and 1/5/25.

SEC source: 0001062993-23-000717 · form4.xml · nonDerivative · entry 1

Harris Joseph Michael · CIK 0001946070 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,402

F1 · shares: Represents shares of restricted stock granted to the reporting person in lieu of cash fees payable to the reporting person for his service on the Company's Board of Directors for 2022. These shares of restricted stock vest 6 months following the grant date.

F1 · ownership.direct: Represents shares of restricted stock granted to the reporting person in lieu of cash fees payable to the reporting person for his service on the Company's Board of Directors for 2022. These shares of restricted stock vest 6 months following the grant date.

SEC source: 0001437749-22-022068 · rdgdoc.xml · derivative · entry 1

Harris Joseph Michael · CIK 0001946070 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,115

Underlying: Common Stock · 13,115 shares

Expires 2032-09-06

F1 · derivative.exercise_date: On September 6, 2022, the Company granted to Mr. Harris an option to purchase 13,115 shares of common stock of the Company, of which one-third vested immediately upon the grant date, one-third will vest on the first anniversary of the grant date, and the remaining one-third will vest on the second anniversary of the grant date.

SEC source: 0001437749-22-005408 · rdgdoc.xml · derivative · entry 2

Astor Andrew · CIK 0001698052 · Director · President, CEO & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 14,815 shares

Expires 2022-03-17

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001437749-22-005408 · rdgdoc.xml · nonDerivative · entry 1

Astor Andrew · CIK 0001698052 · Director · President, CEO & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 92,773

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001437749-22-003841 · rdgdoc.xml · nonDerivative · entry 1

Lobo Wesley S. · CIK 0001841597 · Chief Marketing Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,168

F1 · shares: The reporting person has elected to satisfy his tax withholding obligation in connection with the vesting of a prior restricted stock grant by directing the Company to withhold shares otherwise issuable upon vesting of the previously reported grant.

F2 · balance_after: Includes 15,000 shares of restricted stock for which the risk of forfeiture will lapse as to 5,000 shares on each of 2/16/23, 2/16/24 and 2/16/25.

SEC source: 0001437749-21-028833 · rdgdoc.xml · derivative · entry 2

Amron Arthur H · CIK 0001179697 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,062

Underlying: Common Stock · 7,062 shares

Expires 2031-12-14

F2 · derivative.exercise_date: On December 14, 2021, the Company granted an option to purchase 7,062 shares of common stock of the Company (the "Option") in respect of the service by Mr. Amron as a member of the Board of Directors of the Company. The Option was granted under the Company's 2015 Equity Incentive Plan (the "2015 Plan"). At the request of Mr. Amron, the Option was granted to Wexford Capital LP. The Option vests as to 2,354 shares on each of 12/14/21, 12/14/22 and 12/14/23.

F2 · ownership.direct: On December 14, 2021, the Company granted an option to purchase 7,062 shares of common stock of the Company (the "Option") in respect of the service by Mr. Amron as a member of the Board of Directors of the Company. The Option was granted under the Company's 2015 Equity Incentive Plan (the "2015 Plan"). At the request of Mr. Amron, the Option was granted to Wexford Capital LP. The Option vests as to 2,354 shares on each of 12/14/21, 12/14/22 and 12/14/23.

SEC source: 0001437749-21-028833 · rdgdoc.xml · nonDerivative · entry 1

Amron Arthur H · CIK 0001179697 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,582

F1 · shares: On December 14, 2021, the Company granted 4,582 shares of restricted stock of the Company (the "Restricted Stock") in lieu of cash fees payable to Mr. Amron in respect of his services as a member of the Board of Directors of the Company. The Restricted Stock was granted under the Company's 2015 Equity Incentive Plan (the "2015 Plan"). At the request of Mr. Amron, the Restricted Stock was granted to Wexford Capital LP. The Restricted Stock vests 6 months following the grant date.

F1 · ownership.direct: On December 14, 2021, the Company granted 4,582 shares of restricted stock of the Company (the "Restricted Stock") in lieu of cash fees payable to Mr. Amron in respect of his services as a member of the Board of Directors of the Company. The Restricted Stock was granted under the Company's 2015 Equity Incentive Plan (the "2015 Plan"). At the request of Mr. Amron, the Restricted Stock was granted to Wexford Capital LP. The Restricted Stock vests 6 months following the grant date.

SEC source: 0001437749-21-028832 · rdgdoc.xml · derivative · entry 9

Astor Andrew · CIK 0001698052 · Director · President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 38,612

Underlying: Common Stock · 38,612 shares

Expires 2031-12-14

F7 · derivative.exercise_date: On 12/14/21, the Reporting Person was granted an option to purchase 38,612 shares of common stock of the Company. Options to purchase 9,653 shares vest on 12/14/22 and options to purchase 28,959 shares vest quarterly in 12 equal amounts commencing on 3/14/23.

SEC source: 0001437749-21-028836 · rdgdoc.xml · derivative · entry 5

Lask Alisa · CIK 0001767593 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,062

Underlying: Common Stock · 7,062 shares

Expires 2031-12-14

F4 · derivative.exercise_date: Represents options granted to the reporting person for her service on the Company's Board of Directors. This option vests as to 2,354 shares on each of 12/14/21, 12/14/22 and 12/14/23.

SEC source: 0001437749-21-028836 · rdgdoc.xml · nonDerivative · entry 1

Lask Alisa · CIK 0001767593 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,725

F1 · shares: Represents shares of restricted stock granted to the reporting person in lieu of cash fees payable to the reporting person for her service on the Company's Board of Directors. These shares of restricted stock vest 6 months following the grant date.

SEC source: 0001437749-21-028835 · rdgdoc.xml · derivative · entry 5

Gwydir Tom · CIK 0001775308 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,062

Underlying: Common Stock · 7,062 shares

Expires 2031-12-14

F4 · derivative.exercise_date: Represents options granted to the reporting person for his service on the Company's Board of Directors. This option vests as to 2,354 shares on each of 12/14/21, 12/14/22 and 12/14/23.

SEC source: 0001437749-21-028835 · rdgdoc.xml · nonDerivative · entry 1

Gwydir Tom · CIK 0001775308 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,613

F1 · shares: Represents shares of restricted stock granted to the reporting person in lieu of cash fees payable to the reporting person for his service on the Company's Board of Directors. These shares of restricted stock vest 6 months following the grant date.

SEC source: 0001437749-21-028834 · rdgdoc.xml · derivative · entry 6

Spandow Oliver J. · CIK 0001749836 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,062

Underlying: Common Stock · 7,062 shares

Expires 2031-12-14

F4 · derivative.exercise_date: Represents options granted to the reporting person for his service on the Company's Board of Directors. This option vests as to 2,354 shares on each of 12/14/21, 12/14/22 and 12/14/23.

SEC source: 0001437749-21-028834 · rdgdoc.xml · nonDerivative · entry 1

Spandow Oliver J. · CIK 0001749836 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,829

F1 · shares: Represents shares of restricted stock granted to the reporting person in lieu of cash fees payable to the reporting person for his service on the Company's Board of Directors. These shares of restricted stock vest 6 months following the grant date.

SEC source: 0000914190-21-000344 · edgar.xml · derivative · entry 3

Lobo Wesley S. · CIK 0001841597 · Chief Commercial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 57,368

Underlying: Common Stock · 57,368 shares

Expires 2031-09-01

F3 · derivative.exercise_date: Options to purchase 14,342 shares vest on 9/1/22 and options to purchase 43,026 shares vest quarterly in 12 equal amounts commencing on 12/1/22.

SEC source: 0000914190-21-000286 · edgar.xml · nonDerivative · entry 1

Lobo Wesley S. · CIK 0001841597 · Chief Marketing Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 41,557

F1 · balance_after: Includes (i) 20,557 shares of restricted stock for which the risk of forfeiture will lapse on 2/16/22; and (ii) 20,000 shares of restricted stock for which the risk of forfeiture will lapse as to 5,000 shares on each of 2/16/22, 2/16/23, 2/16/24 and 2/16/25.

SEC source: 0000914190-21-000282 · edgar.xml · nonDerivative · entry 2

Astor Andrew · CIK 0001698052 · Director · President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 77,958

F2 · price: The reported price in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $7.60 to $7.85. The reporting person undertakes to provide the Company, any security holder of the Company. or the staff of the Securities and Exchange Commission upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

SEC source: 0000914190-21-000284 · edgar.xml · nonDerivative · entry 1

Gwydir Tom · CIK 0001775308 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,031

SEC source: 0000914190-21-000282 · edgar.xml · nonDerivative · entry 1

Astor Andrew · CIK 0001698052 · Director · President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 75,458

F1 · price: The reported price in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $7.66 to $7.6699. The reporting person undertakes to provide the Company, any security holder of the Company. or the staff of the Securities and Exchange Commission upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

SEC source: 0000902664-21-002989 · ownership.xml · derivative · entry 3

WEXFORD CAPITAL LP · CIK 0001048462 · Director · 10% owner

Wexford GP LLC · CIK 0001472112 · Director · 10% owner

DAVIDSON CHARLES E · CIK 0001001391 · Director · 10% owner

JACOBS JOSEPH · CIK 0001048485 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

Underlying: Common Stock · 66,667 shares

Expires 2021-06-03

F3 · ownership.nature: Wexford Capital LP ("Wexford Capital") may, by reason of its status as (i) investment manager of WP11, (ii) manager of WPIC2 and (iii) sub-advisor of WST, be deemed to own beneficially the securities held by the Wexford Entities and WST. Wexford GP LLC ("Wexford GP") may, as the General Partner of Wexford Capital, be deemed to own beneficially the securities held by the Wexford Entities and WST. Each of Charles E. Davidson ("Davidson") and Joseph M. Jacobs ("Jacobs", and together with Wexford Capital, Wexford GP and Davidson, the "Reporting Persons") may, by reason of his status as a controlling person of Wexford GP and Wexford Advisors, be deemed to own beneficially the securities held by the Wexford Entities, Wexford Advisors and WST.

F4 · ownership.nature: Each of Wexford Capital, Wexford GP, Davidson and Jacobs share the power to vote and to dispose of the securities beneficially owned by the Wexford Entities and WST. Each of Davidson and Jacobs share the power to vote and to dispose of the securities beneficially owned by Wexford Advisors. Each of Wexford Capital, Wexford GP, Davidson and Jacobs disclaim beneficial ownership of the securities owned by the Wexford Entities, Wexford Advisors and/or WST, as applicable, and this report shall not be deemed as an admission that they are the beneficial owners of such securities, except to the extent of any pecuniary interests therein. The Reporting Persons may be deemed to be directors by deputization by virtue of Arthur Amron, an employee of Wexford Capital, serving as a director of the Issuer.

SEC source: 0000902664-21-002989 · ownership.xml · nonDerivative · entry 1

WEXFORD CAPITAL LP · CIK 0001048462 · Director · 10% owner

Wexford GP LLC · CIK 0001472112 · Director · 10% owner

DAVIDSON CHARLES E · CIK 0001001391 · Director · 10% owner

JACOBS JOSEPH · CIK 0001048485 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 3,544,492

F1 · shares: Represents the common stock of the Issuer acquired in connection with the exercise of 66,667 common stock warrants held in the aggregate by Wexford Partners 11, L.P., ("WP11"), WPIC 2 LLC ("WPIC2", and together with WP11, the "Wexford Entities") and Wexford 11 Advisors LLC ("WP Advisors").

F2 · balance_after: Represents the common stock of the Issuer held in the aggregate by the Wexford Entities, WP Advisors and Wexford Spectrum Trading Limited ("WST").

F3 · ownership.nature: Wexford Capital LP ("Wexford Capital") may, by reason of its status as (i) investment manager of WP11, (ii) manager of WPIC2 and (iii) sub-advisor of WST, be deemed to own beneficially the securities held by the Wexford Entities and WST. Wexford GP LLC ("Wexford GP") may, as the General Partner of Wexford Capital, be deemed to own beneficially the securities held by the Wexford Entities and WST. Each of Charles E. Davidson ("Davidson") and Joseph M. Jacobs ("Jacobs", and together with Wexford Capital, Wexford GP and Davidson, the "Reporting Persons") may, by reason of his status as a controlling person of Wexford GP and Wexford Advisors, be deemed to own beneficially the securities held by the Wexford Entities, Wexford Advisors and WST.

F4 · ownership.nature: Each of Wexford Capital, Wexford GP, Davidson and Jacobs share the power to vote and to dispose of the securities beneficially owned by the Wexford Entities and WST. Each of Davidson and Jacobs share the power to vote and to dispose of the securities beneficially owned by Wexford Advisors. Each of Wexford Capital, Wexford GP, Davidson and Jacobs disclaim beneficial ownership of the securities owned by the Wexford Entities, Wexford Advisors and/or WST, as applicable, and this report shall not be deemed as an admission that they are the beneficial owners of such securities, except to the extent of any pecuniary interests therein. The Reporting Persons may be deemed to be directors by deputization by virtue of Arthur Amron, an employee of Wexford Capital, serving as a director of the Issuer.

SEC source: 0000914190-21-000169 · edgar.xml · nonDerivative · entry 2

Evans Daron · CIK 0001411726 · CEO Specialty Renal Products

10b5-1 filing: Not disclosed

Ownership: Indirect · By UTMA #2

Disclosed balance after: 8,669

SEC source: 0000914190-21-000169 · edgar.xml · nonDerivative · entry 1

Evans Daron · CIK 0001411726 · CEO Specialty Renal Products

10b5-1 filing: Not disclosed

Ownership: Indirect · By UTMA #1

Disclosed balance after: 8,947

SEC source: 0000914190-21-000162 · edgar.xml · derivative · entry 12

Evans Daron · CIK 0001411726 · CEO of Specialty Renal Product

10b5-1 filing: Not disclosed

Ownership: Indirect · By UTMA #2

Disclosed balance after: 0

Underlying: Common Stock · 1,111 shares

Expires 2021-06-03

F6 · derivative.underlying_shares: Previous filings mistakenly reflected this amount as 1,112 shares; the correct amount after appropriate rounding adjustments is 1,111 shares, as reflected above.

SEC source: 0000914190-21-000162 · edgar.xml · derivative · entry 11

Evans Daron · CIK 0001411726 · CEO of Specialty Renal Product

10b5-1 filing: Not disclosed

Ownership: Indirect · By UTMA #1

Disclosed balance after: 0

Underlying: Common Stock · 1,111 shares

Expires 2021-06-03

F6 · derivative.underlying_shares: Previous filings mistakenly reflected this amount as 1,112 shares; the correct amount after appropriate rounding adjustments is 1,111 shares, as reflected above.

SEC source: 0000914190-21-000162 · edgar.xml · nonDerivative · entry 3

Evans Daron · CIK 0001411726 · CEO of Specialty Renal Product

10b5-1 filing: Not disclosed

Ownership: Indirect · By UTMA #2

Disclosed balance after: 9,018

SEC source: 0000914190-21-000162 · edgar.xml · nonDerivative · entry 2

Evans Daron · CIK 0001411726 · CEO of Specialty Renal Product

10b5-1 filing: Not disclosed

Ownership: Indirect · By UTMA #1

Disclosed balance after: 9,296

SEC source: 0000914190-21-000070 · edgar.xml · derivative · entry 2

Lobo Wesley S. · CIK 0001841597 · Chief Marketing Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 114,178

Underlying: Common Stock · 114,178 shares

Expires 2031-02-16

F2 · derivative.exercise_date: Options to purchase 28,545 shares vest on 2/16/22 and options to purchase 85,633 shares vest quarterly in 12 equal amounts commencing on 5/16/22.

SEC source: 0000914190-21-000070 · edgar.xml · nonDerivative · entry 1

Lobo Wesley S. · CIK 0001841597 · Chief Marketing Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,557

F1 · shares: Includes (i) 20,557 shares of restricted stock for which the risk of forfeiture will lapse on 2/16/22; and (ii) 20,000 shares of restricted stock for which the risk of forfeiture will lapse as to 5,000 shares on each of 2/16/22, 2/16/23, 2/16/24 and 2/16/25.

SEC source: 0001048462-21-000005 · form4.xml · derivative · entry 8

WEXFORD CAPITAL LP · CIK 0001048462 · Director · 10% owner

Wexford GP LLC · CIK 0001472112 · Director · 10% owner

DAVIDSON CHARLES E · CIK 0001001391 · Director · 10% owner

JACOBS JOSEPH · CIK 0001048485 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,477

Underlying: Common Stock · 4,477 shares

Expires 2021-01-29

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · balance_after: Includes the options reported in the Form 4 filed by Arthur Amron on December 22, 2017.

SEC source: 0001048462-21-000005 · form4.xml · derivative · entry 7

WEXFORD CAPITAL LP · CIK 0001048462 · Director · 10% owner

Wexford GP LLC · CIK 0001472112 · Director · 10% owner

DAVIDSON CHARLES E · CIK 0001001391 · Director · 10% owner

JACOBS JOSEPH · CIK 0001048485 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,765

Underlying: Common Stock · 3,765 shares

Expires 2021-01-29

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · balance_after: Includes the options reported in the Form 4 filed by Arthur Amron on August 25, 2016.

SEC source: 0001048462-21-000005 · form4.xml · derivative · entry 6

WEXFORD CAPITAL LP · CIK 0001048462 · Director · 10% owner

Wexford GP LLC · CIK 0001472112 · Director · 10% owner

DAVIDSON CHARLES E · CIK 0001001391 · Director · 10% owner

JACOBS JOSEPH · CIK 0001048485 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,956

Underlying: Common Stock · 2,956 shares

Expires 2021-01-29

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · balance_after: Includes the options reported in the Form 4 filed by Arthur Amron on March 27, 2014.

SEC source: 0001048462-21-000005 · form4.xml · derivative · entry 5

WEXFORD CAPITAL LP · CIK 0001048462 · Director · 10% owner

Wexford GP LLC · CIK 0001472112 · Director · 10% owner

DAVIDSON CHARLES E · CIK 0001001391 · Director · 10% owner

JACOBS JOSEPH · CIK 0001048485 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,556

Underlying: Common Stock · 3,556 shares

Expires 2021-01-29

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · balance_after: Includes the options reported in the Form 4 filed by Arthur Amron on March 28, 2011.

SEC source: 0001048462-21-000005 · form4.xml · nonDerivative · entry 4

WEXFORD CAPITAL LP · CIK 0001048462 · Director · 10% owner

Wexford GP LLC · CIK 0001472112 · Director · 10% owner

DAVIDSON CHARLES E · CIK 0001001391 · Director · 10% owner

JACOBS JOSEPH · CIK 0001048485 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 106,037

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001048462-21-000005 · form4.xml · nonDerivative · entry 3

WEXFORD CAPITAL LP · CIK 0001048462 · Director · 10% owner

Wexford GP LLC · CIK 0001472112 · Director · 10% owner

DAVIDSON CHARLES E · CIK 0001001391 · Director · 10% owner

JACOBS JOSEPH · CIK 0001048485 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 101,560

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001048462-21-000005 · form4.xml · nonDerivative · entry 2

WEXFORD CAPITAL LP · CIK 0001048462 · Director · 10% owner

Wexford GP LLC · CIK 0001472112 · Director · 10% owner

DAVIDSON CHARLES E · CIK 0001001391 · Director · 10% owner

JACOBS JOSEPH · CIK 0001048485 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 97,795

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001048462-21-000005 · form4.xml · nonDerivative · entry 1

WEXFORD CAPITAL LP · CIK 0001048462 · Director · 10% owner

Wexford GP LLC · CIK 0001472112 · Director · 10% owner

DAVIDSON CHARLES E · CIK 0001001391 · Director · 10% owner

JACOBS JOSEPH · CIK 0001048485 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 94,839

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: Includes vested and unvested shares of common stock granted to Wexford Capital LP ("Wexford Capital") as reported in Form 4s previously filed by Arthur Amron and Paul Mieyal, respectively, a current and former director of the Company and a current and former employee of Wexford Capital.

SEC source: 0001048462-21-000003 · form4.xml · nonDerivative · entry 1

WEXFORD CAPITAL LP · CIK 0001048462 · Director · 10% owner

Wexford GP LLC · CIK 0001472112 · Director · 10% owner

DAVIDSON CHARLES E · CIK 0001001391 · Director · 10% owner

JACOBS JOSEPH · CIK 0001048485 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,196

F1 · shares: On January 6, 2021, the Company granted 3,196 shares of restricted stock of the Company (the "Restricted Stock") in lieu of cash fees payable to Mr. Paul Mieyal in respect of his services as a member of the Board of Directors of the Company through October 28, 2020. The Restricted Stock was granted under the Company's 2015 Equity Incentive Plan (the "2015 Plan"). At the request of Mr. Mieyal, the Restricted Stock was granted to Wexford Capital LP. The Restricted Stock vests 6 months following the grant date.

F1 · balance_after: On January 6, 2021, the Company granted 3,196 shares of restricted stock of the Company (the "Restricted Stock") in lieu of cash fees payable to Mr. Paul Mieyal in respect of his services as a member of the Board of Directors of the Company through October 28, 2020. The Restricted Stock was granted under the Company's 2015 Equity Incentive Plan (the "2015 Plan"). At the request of Mr. Mieyal, the Restricted Stock was granted to Wexford Capital LP. The Restricted Stock vests 6 months following the grant date.

SEC source: 0000914190-21-000006 · edgar.xml · derivative · entry 2

AMRON ARTHUR H · CIK 0001179697 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,850

Underlying: Common Stock · 6,850 shares

Expires 2031-01-06

F2 · derivative.exercise_date: On January 6, 2021, the Company granted an option to purchase 6,850 shares of common stock of the Company (the "Option") in respect of the service by Mr. Amron as a member of the Board of Directors of the Company. The Option was granted under the Company's 2015 Equity Incentive Plan (the "2015 Plan"). At the request of Mr. Amron, the Option was granted to Wexford Capital LP. The Option vests as to 2,284 shares on 1/6/21, and as to 2,283 shares on 1/6/22 and 1/6/23.

F2 · ownership.direct: On January 6, 2021, the Company granted an option to purchase 6,850 shares of common stock of the Company (the "Option") in respect of the service by Mr. Amron as a member of the Board of Directors of the Company. The Option was granted under the Company's 2015 Equity Incentive Plan (the "2015 Plan"). At the request of Mr. Amron, the Option was granted to Wexford Capital LP. The Option vests as to 2,284 shares on 1/6/21, and as to 2,283 shares on 1/6/22 and 1/6/23.

SEC source: 0000914190-21-000006 · edgar.xml · nonDerivative · entry 1

AMRON ARTHUR H · CIK 0001179697 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,666

F1 · shares: On January 6, 2021, the Company granted 3,666 shares of restricted stock of the Company (the "Restricted Stock") in lieu of cash fees payable to Mr. Amron in respect of his services as a member of the Board of Directors of the Company. The Restricted Stock was granted under the Company's 2015 Equity Incentive Plan (the "2015 Plan"). At the request of Mr. Amron, the Restricted Stock was granted to Wexford Capital LP. The Restricted Stock vests 6 months following the grant date.

F1 · ownership.direct: On January 6, 2021, the Company granted 3,666 shares of restricted stock of the Company (the "Restricted Stock") in lieu of cash fees payable to Mr. Amron in respect of his services as a member of the Board of Directors of the Company. The Restricted Stock was granted under the Company's 2015 Equity Incentive Plan (the "2015 Plan"). At the request of Mr. Amron, the Restricted Stock was granted to Wexford Capital LP. The Restricted Stock vests 6 months following the grant date.

SEC source: 0000914190-21-000008 · edgar.xml · derivative · entry 8

PERSEN MALCOLM C · CIK 0001287975 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,850

Underlying: Common Stock · 6,850 shares

Expires 2031-01-06

F4 · derivative.exercise_date: Represents options granted to the reporting person for his service on the Company's Board of Directors. This option vests as to 2,284 shares on 1/6/21 and as to 2,283 shares on each of 1/6/22 and 1/6/23.

SEC source: 0000914190-21-000008 · edgar.xml · nonDerivative · entry 1

PERSEN MALCOLM C · CIK 0001287975 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 48,774

F1 · shares: Represents shares of restricted stock granted to the reporting person in lieu of cash fees payable to the reporting person for his service on the Company's Board of Directors. These shares of restricted stock vest 6 months following the grant date.

SEC source: 0000914190-21-000010 · edgar.xml · derivative · entry 4

Gwydir Tom · CIK 0001775308 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,850

Underlying: Common Stock · 6,850 shares

Expires 2031-01-06

F4 · derivative.exercise_date: Represents options granted to the reporting person for his service on the Company's Board of Directors. This option vests as to 2,284 shares on 1/6/21 and as to 2,283 shares on each of 1/6/22 and 1/6/23.

SEC source: 0000914190-21-000010 · edgar.xml · nonDerivative · entry 1

Gwydir Tom · CIK 0001775308 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,031

F1 · shares: Represents shares of restricted stock granted to the reporting person in lieu of cash fees payable to the reporting person for his service on the Company's Board of Directors. These shares of restricted stock vest 6 months following the grant date.

SEC source: 0000914190-21-000009 · edgar.xml · derivative · entry 4

Lask Alisa · CIK 0001767593 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,850

Underlying: Common Stock · 6,850 shares

Expires 2031-01-06

F4 · derivative.exercise_date: Represents options granted to the reporting person for her service on the Company's Board of Directors. This option vests as to 2,284 shares on 1/6/21 and as to 2,283 shares on each of 1/6/22 and 1/6/23.

SEC source: 0000914190-21-000009 · edgar.xml · nonDerivative · entry 1

Lask Alisa · CIK 0001767593 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,143

F1 · shares: Represents shares of restricted stock granted to the reporting person in lieu of cash fees payable to the reporting person for her service on the Company's Board of Directors. These shares of restricted stock vest 6 months following the grant date.