NCSM

SEC source: 0001140361-17-018475 · form4.xml · nonDerivative · entry 1

Stromquist Marty · CIK 0001699918 · Director · President

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 25,000

F1 · price: Represents exchangeable shares in NCS Multistage Inc., a wholly owned indirect subsidiary of the Issuer, that were exchanged for shares of common stock of the Issuer in connection with the Issuer's initial public offering. Each exchangeable share is convertible into three shares of common stock of the Issuer, subject to adjustment. The exchangeable shares are currently exercisable and have no expiration date.

F2 · ownership.nature: The shares are held by Cemblend Systems Inc. Cemblend Systems Inc. is indirectly 50% owned by Mr. Stromquist.

SEC source: 0001140361-17-018469 · form4.xml · nonDerivative · entry 1

MCSHANE MICHAEL · CIK 0001236484 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 324,999

F1 · shares: The shares of common stock were purchased in the Issuer's initial public offering pursuant to a directed share program.

SEC source: 0001140361-17-018467 · form4.xml · nonDerivative · entry 1

DEANE JOHN D · CIK 0001236472 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 50,000

F1 · shares: The shares of common stock were purchased in the Issuer's initial public offering pursuant to a directed share program.

SEC source: 0001209191-17-030177 · doc4.xml · nonDerivative · entry 1

ADVENT INTERNATIONAL CORP/MA · CIK 0001034196 · 10% owner

Advent-NCS Acquisition Limited Partnership · CIK 0001692560 · 10% owner

Advent-NCS GP LLC · CIK 0001698335 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Notes

Disclosed balance after: 29,568,536

F1 · shares: The shares of common stock of the Issuer were sold pursuant to the underwriters' exercise of their over-allotment option in connection with an initial public offering of the common stock of the Issuer pursuant to the prospectus, dated April 27, 2017, and accompanying registration statement on Form S-1/A, dated April 26, 2017.

F2 · ownership.nature: Represents 29,568,536 shares held directly by Advent-NCS Acquisition Limited Partnership ("Advent-NCS LP"), of which 3,693,109 shares are indirectly owned by Advent International GPE VII Limited Partnership("AI GPE VII"), 3,418,124 shares are indirectly owned by Advent International GPE VII-A Limited Partnership ("AI GPE VII-A"), 8,589,659 shares are indirectly owned by Advent International GPE VII-B Limited Partnership ("AI GPE VII-B"), 2,729,175 shares are indirectly owned by Advent International GPE VII-C Limited Partnership ("AI GPE VII-C"),(CONTINUED IN NEXT FOOTNOTE)

F3 · ownership.nature: (CONTINUTED FROM PREVIOUS FOOTNOTE) 2,211,725 shares are indirectly owned by Advent International GPE VII-D Limited Partnership ("AI GPE VII-D"), 6,188,694 shares are indirectly owned by Advent International GPE VII-E Limited Partnership ("AI GPE VII-E"), 798,351 shares are indirectly owned by Advent International GPE VII-F Limited Partnership ("AI GPE VII-F"), 798,351 shares are indirectly owned by Advent International GPE VII-G Limited Partnership ("AI GPE VII-G"), 481,968 shares are indirectly owned by Advent International GPE VII-H Limited Partnership ("AI GPE VII-H"), 11,828 shares are indirectly owned by Advent Partners GPE VII Limited Partnership ("AP GPE VII"), 29,570 shares are indirectly owned by Advent Partners GPE VII-A Limited Partnership ("AP GPE VII-A"), (CONTINUED IN NEXT FOOTNOTE)

F4 · ownership.nature: (CONTINUTED FROM PREVIOUS FOOTNOTE) 289,771 shares are indirectly owned by Advent Partners GPE VII-B Cayman Limited Partnership ("AP GPE VII-B Cayman"), 260,204 shares are indirectly owned by Advent Partners GPE VII Cayman Limited Partnership ("AP GPE VII Cayman") and 68,007 shares are indirectly owned by Advent Partners GPE VII-A Cayman Limited Partnership ("AP GPE VII-A Cayman").

F5 · ownership.nature: Advent International Corporation ("AIC") is the manager of Advent International LLC ("AILLC") and of Advent International GPE VII, LLC ("AI GPE VII GP"). AI GPE VII GP is the general partner of each of AP GPE VII, AP GPE VII-A, AP GPE VII Cayman, AP GPE VII-A Cayman and AP GPE VII-B Cayman (collectively, the "AP Funds"). AI GPE VII GP also is the general partner of GPE VII GP Limited Partnership ("GPE VII GP"), which is the general partner of each of AI GPE VII-A, AI GPE VII-E and AI GPE VII-H (collectively, the "GPE VII GP Funds"). AI GPE VII GP also is the general partner of GPE VII GP (Delaware)Limited Partnership ("GPE VII GP DE"), which is the general partner of each of AI GPE VII, AI GPE VII-B, AI GPE VII-C, AI GPE VII-D, AI GPE VII-F and AI GPE VII-G (collectively, the "GPE VII GP DE Funds"). Advent-NCS GP LLC ("Advent-NCS GP") is the general partner of Advent NSC LP. The AP Funds, GPE VII GP Funds and GPE VII GP DE Funds collectively own 100% (CONTINUED IN NEXT FOOTNOTE)

F6 · ownership.nature: (CONTINUED FROM PREVIOUS FOOTNOTE) of the limited partnership interest in Advent-NCS LP. Each of AIC, AILLC, AI GPE VII GP, GPE VII GP, GPE VII GP DE, Advent-NCS GP, Advent-NCS LP, each of the AP Funds, each of the GPE VII GP Funds and each of the GPE VII GP DE Funds are referred to herein as the "Reporting Persons". Each Reporting Person disclaims Section 16 beneficial ownership of the shares reported herein except to the extent of its respective pecuniary interest therein, if any, and the inclusion of these shares in their report shall not be deemed an admission of beneficial ownership of all of the reported shares for purposes of Section 16 or any other purpose.

SEC source: 0001209191-17-030176 · doc4.xml · nonDerivative · entry 1

ADVENT INTERNATIONAL CORP/MA · CIK 0001034196 · 10% owner

Advent Partners GPE VII Limited Partnership · CIK 0001556190 · 10% owner

Advent Partners GPE VII Cayman Limited Partnership · CIK 0001561808 · 10% owner

Advent Partners GPE VII-A Limited Partnership · CIK 0001559259 · 10% owner

Advent Partners GPE VII-A Cayman Limited Partnership · CIK 0001559260 · 10% owner

Advent Partners GPE VII-B Cayman Limited Partnership · CIK 0001563878 · 10% owner

Advent International GPE VII, LLC · CIK 0001616626 · 10% owner

GPE VII GP Limited Partnership · CIK 0001616580 · 10% owner

GPE VII GP (Delaware) Limited Partnership · CIK 0001616558 · 10% owner

Advent International GPE VII-H Limited Partnership · CIK 0001553021 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Notes

Disclosed balance after: 29,568,536

F1 · shares: The shares of common stock of the Issuer were sold pursuant to the underwriters' exercise of their over-allotment option in connection with an initial public offering of the common stock of the Issuer pursuant to the prospectus, dated April 27, 2017, and accompanying registration statement on Form S-1/A, dated April 26, 2017.

F2 · ownership.nature: Represents 29,568,536 shares held directly by Advent-NCS Acquisition Limited Partnership ("Advent-NCS LP"), of which 3,693,109 shares are indirectly owned by Advent International GPE VII Limited Partnership("AI GPE VII"), 3,418,124 shares are indirectly owned by Advent International GPE VII-A Limited Partnership ("AI GPE VII-A"), 8,589,659 shares are indirectly owned by Advent International GPE VII-B Limited Partnership ("AI GPE VII-B"), 2,729,175 shares are indirectly owned by Advent International GPE VII-C Limited Partnership ("AI GPE VII-C"),(CONTINUED IN NEXT FOOTNOTE)

F3 · ownership.nature: (CONTINUTED FROM PREVIOUS FOOTNOTE) 2,211,725 shares are indirectly owned by Advent International GPE VII-D Limited Partnership ("AI GPE VII-D"), 6,188,694 shares are indirectly owned by Advent International GPE VII-E Limited Partnership ("AI GPE VII-E"), 798,351 shares are indirectly owned by Advent International GPE VII-F Limited Partnership ("AI GPE VII-F"), 798,351 shares are indirectly owned by Advent International GPE VII-G Limited Partnership ("AI GPE VII-G"), 481,968 shares are indirectly owned by Advent International GPE VII-H Limited Partnership ("AI GPE VII-H"), 11,828 shares are indirectly owned by Advent Partners GPE VII Limited Partnership ("AP GPE VII"), 29,570 shares are indirectly owned by Advent Partners GPE VII-A Limited Partnership ("AP GPE VII-A"), (CONTINUED IN NEXT FOOTNOTE)

F4 · ownership.nature: (CONTINUTED FROM PREVIOUS FOOTNOTE) 289,771 shares are indirectly owned by Advent Partners GPE VII-B Cayman Limited Partnership ("AP GPE VII-B Cayman"), 260,204 shares are indirectly owned by Advent Partners GPE VII Cayman Limited Partnership ("AP GPE VII Cayman") and 68,007 shares are indirectly owned by Advent Partners GPE VII-A Cayman Limited Partnership ("AP GPE VII-A Cayman").

F5 · ownership.nature: Advent International Corporation ("AIC") is the manager of Advent International LLC ("AILLC") and of Advent International GPE VII, LLC ("AI GPE VII GP"). AI GPE VII GP is the general partner of each of AP GPE VII, AP GPE VII-A, AP GPE VII Cayman, AP GPE VII-A Cayman and AP GPE VII-B Cayman (collectively, the "AP Funds"). AI GPE VII GP also is the general partner of GPE VII GP Limited Partnership ("GPE VII GP"), which is the general partner of each of AI GPE VII-A, AI GPE VII-E and AI GPE VII-H (collectively, the "GPE VII GP Funds"). AI GPE VII GP also is the general partner of GPE VII GP (Delaware)Limited Partnership ("GPE VII GP DE"), which is the general partner of each of AI GPE VII, AI GPE VII-B, AI GPE VII-C, AI GPE VII-D, AI GPE VII-F and AI GPE VII-G (collectively, the "GPE VII GP DE Funds"). Advent-NCS GP LLC ("Advent-NCS GP") is the general partner of Advent-NCS LP. The AP Funds, GPE VII GP Funds and GPE VII GP DE Funds collectively own 100% (CONTINUED IN NEXT FOOTNOTE)

F6 · ownership.nature: (CONTINUTED FROM PREVIOUS FOOTNOTE) of the limited partnership interests in Advent-NCS LP. Each of AIC, AILLC, AI GPE VII GP, GPE VII GP, GPE VII GP DE, Advent-NCS GP, Advent-NCS LP, each of the AP Funds, each of the GPE VII GP Funds and each of the GPE VII GP DE Funds are referred to herein as the "Reporting Persons". Each Reporting Person disclaims Section 16 beneficial ownership of the shares reported herein except to the extent of its respective pecuniary interest therein, if any, and the inclusion of these shares in their report shall not be deemed an admission of beneficial ownership of all of the reported shares for purposes of Section 16 or any other purpose.

SEC source: 0001209191-17-030175 · doc4.xml · nonDerivative · entry 1

ADVENT INTERNATIONAL CORP/MA · CIK 0001034196 · 10% owner

ADVENT INTERNATIONAL LLC · CIK 0001227759 · 10% owner

Advent International GPE VII Limited Partnership · CIK 0001551274 · 10% owner

Advent International GPE VII-A Limited Partnership · CIK 0001551275 · 10% owner

Advent International GPE VII-B Limited Partnership · CIK 0001551276 · 10% owner

Advent International GPE VII-C Limited Partnership · CIK 0001551366 · 10% owner

Advent International GPE VII-D Limited Partnership · CIK 0001551365 · 10% owner

Advent International GPE VII-E Limited Partnership · CIK 0001551364 · 10% owner

Advent International GPE VII-F Limited Partnership · CIK 0001551363 · 10% owner

Advent International GPE VII-G Limited Partnership · CIK 0001553020 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Notes

Disclosed balance after: 29,568,536

F1 · shares: The shares of common stock of the Issuer were sold pursuant to the underwriters' exercise of their over-allotment option in connection with an initial public offering of the common stock of the Issuer pursuant to the prospectus, dated April 27, 2017, and accompanying registration statement on Form S-1/A, dated April 26, 2017.

F2 · ownership.nature: Represents 29,568,536 shares held directly by Advent-NCS Acquisition Limited Partnership ("Advent-NCS LP"), of which 3,693,109 shares are indirectly owned by Advent International GPE VII Limited Partnership("AI GPE VII"), 3,418,124 shares are indirectly owned by Advent International GPE VII-A Limited Partnership ("AI GPE VII-A"), 8,589,659 shares are indirectly owned by Advent International GPE VII-B Limited Partnership ("AI GPE VII-B"), 2,729,175 shares are indirectly owned by Advent International GPE VII-C Limited Partnership ("AI GPE VII-C"),(CONTINUED IN NEXT FOOTNOTE)

F3 · ownership.nature: (CONTINUTED FROM PREVIOUS FOOTNOTE) 2,211,725 shares are indirectly owned by Advent International GPE VII-D Limited Partnership ("AI GPE VII-D"), 6,188,694 shares are indirectly owned by Advent International GPE VII-E Limited Partnership ("AI GPE VII-E"), 798,351 shares are indirectly owned by Advent International GPE VII-F Limited Partnership ("AI GPE VII-F"), 798,351 shares are indirectly owned by Advent International GPE VII-G Limited Partnership ("AI GPE VII-G"), 481,968 shares are indirectly owned by Advent International GPE VII-H Limited Partnership ("AI GPE VII-H"), 11,828 shares are indirectly owned by Advent Partners GPE VII Limited Partnership ("AP GPE VII"), 29,570 shares are indirectly owned by Advent Partners GPE VII-A Limited Partnership ("AP GPE VII-A"), (CONTINUED IN NEXT FOOTNOTE)

F4 · ownership.nature: (CONTINUTED FROM PREVIOUS FOOTNOTE) 289,771 shares are indirectly owned by Advent Partners GPE VII-B Cayman Limited Partnership ("AP GPE VII-B Cayman"), 260,204 shares are indirectly owned by Advent Partners GPE VII Cayman Limited Partnership ("AP GPE VII Cayman") and 68,007 shares are indirectly owned by Advent Partners GPE VII-A Cayman Limited Partnership ("AP GPE VII-A Cayman").

F5 · ownership.nature: Advent International Corporation ("AIC") is the manager of Advent International LLC ("AILLC") and of Advent International GPE VII, LLC ("AI GPE VII GP"). AI GPE VII GP is the general partner of each of AP GPE VII, AP GPE VII-A, AP GPE VII Cayman, AP GPE VII-A Cayman and AP GPE VII-B Cayman (collectively, the "AP Funds"). AI GPE VII GP also is the general partner of GPE VII GP Limited Partnership ("GPE VII GP"), which is the general partner of each of AI GPE VII-A, AI GPE VII-E and AI GPE VII-H (collectively, the "GPE VII GP Funds"). AI GPE VII GP also is the general partner of GPE VII GP (Delaware)Limited Partnership ("GPE VII GP DE"), which is the general partner of each of AI GPE VII, AI GPE VII-B, AI GPE VII-C, AI GPE VII-D, AI GPE VII-F and AI GPE VII-G (collectively, the "GPE VII GP DE Funds"). Advent-NCS GP LLC ("Advent-NCS GP") is the general partner of Advent NSC LP. The AP Funds, GPE VII GP Funds and GPE VII GP DE Funds collectively own 100% (CONTINUED IN NEXT FOOTNOTE)

F6 · ownership.nature: (CONTINUED FROM PREVIOUS FOOTNOTE) of the limited partnership interest in Advent-NCS LP. Each of AIC, AILLC, AI GPE VII GP, GPE VII GP, GPE VII GP DE, Advent-NCS GP, Advent-NCS LP, each of the AP Funds, each of the GPE VII GP Funds and each of the GPE VII GP DE Funds are referred to herein as the "Reporting Persons". Each Reporting Person disclaims Section 16 beneficial ownership of the shares reported herein except to the extent of its respective pecuniary interest therein, if any, and the inclusion of these shares in their report shall not be deemed an admission of beneficial ownership of all of the reported shares for purposes of Section 16 or any other purpose.

SEC source: 0001209191-17-030174 · doc4.xml · nonDerivative · entry 1

Grewal Gurinder · CIK 0001695567 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Notes

Disclosed balance after: 29,568,536

F1 · shares: The shares of common stock of the Issuer were sold pursuant to the underwriters' exercise of their over-allotment option in connection with an initial public offering of the common stock of the Issuer pursuant to the prospectus, dated April 27, 2017, and accompanying registration statement on Form S-1/A, dated April 26, 2017.

F2 · ownership.nature: The Reporting Person is a Managing Director at Advent International Corporation ("AIC") and in addition may have limited partnership or other interests in one or more of the Advent Entities (as defined below). AIC manages funds that collectively own 29,568,536 shares (the "Shares"), which are represented as follows: 3,693,109 shares are indirectly owned by Advent International GPE VII Limited Partnership, 3,418,124 shares are indirectly owned by Advent International GPE VII-A Limited Partnership, 8,589,659 shares are indirectly owned by Advent International GPE VII-B Limited Partnership, 2,729,175 shares are indirectly owned by Advent International GPE VII-C Limited Partnership, (CONTINUED IN NEXT FOOTNOTE)

F3 · ownership.nature: (CONTINUTED FROM PREVIOUS FOOTNOTE) 2,211,725 shares are indirectly owned by Advent International GPE VII-D Limited Partnership, 6,188,694 shares are indirectly owned by Advent International GPE VII-E Limited Partnership, 798,351 shares are indirectly owned by Advent International GPE VII-F Limited Partnership, 798,351 shares are indirectly owned by Advent International GPE VII-G Limited Partnership, 481,968 shares are indirectly owned by Advent International GPE VII-H Limited Partnership, 11,828 shares are indirectly owned by Advent Partners GPE VII Limited Partnership, 29,570 shares are indirectly owned by Advent Partners GPE VII-A Limited Partnership, 289,771 shares are indirectly owned by Advent Partners GPE VII-B Cayman Limited Partnership, 260,204 shares are indirectly owned by Advent Partners GPE VII Cayman Limited Partnership and (CONTINUED IN NEXT FOOTNOTE)

F4 · ownership.nature: (CONTINUTED FROM PREVIOUS FOOTNOTE) 68,007 shares are indirectly owned by Advent Partners GPE VII-A Cayman Limited Partnership (collectively and together with certain other affiliates of Advent, the "Advent Entities"). The Reporting Person disclaims Section 16 beneficial ownership of the Shares except to the extent of his pecuniary interest therein, if any, and the reference to these Shares in this report shall not be deemed an admission of beneficial ownership of all of the Shares for purposes of Section 16 or any other purpose.

SEC source: 0001209191-17-030173 · doc4.xml · nonDerivative · entry 1

McKenna David M · CIK 0001375924 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Notes

Disclosed balance after: 29,568,536

F1 · shares: The shares of common stock of the Issuer were sold pursuant to the underwriters' exercise of their over-allotment option in connection with an initial public offering of the common stock of the Issuer pursuant to the prospectus, dated April 27, 2017, and accompanying registration statement on Form S-1/A, dated April 26, 2017.

F2 · ownership.nature: The Reporting Person is a Managing Partner at Advent International Corporation ("AIC") and in addition may have limited partnership or other interests in one or more of the Advent Entities (as defined below). AIC manages funds that collectively own 29,568,536 shares (the "Shares"), which are represented as follows: 3,693,109 shares are indirectly owned by Advent International GPE VII Limited Partnership, 3,418,124 shares are indirectly owned by Advent International GPE VII-A Limited Partnership, 8,589,659 shares are indirectly owned by Advent International GPE VII-B Limited Partnership, 2,729,175 shares are indirectly owned by Advent International GPE VII-C Limited Partnership, (CONTINUED IN NEXT FOOTNOTE)

F3 · ownership.nature: (CONTINUTED FROM PREVIOUS FOOTNOTE) 2,211,725 shares are indirectly owned by Advent International GPE VII-D Limited Partnership, 6,188,694 shares are indirectly owned by Advent International GPE VII-E Limited Partnership, 798,351 shares are indirectly owned by Advent International GPE VII-F Limited Partnership, 798,351 shares are indirectly owned by Advent International GPE VII-G Limited Partnership, 481,968 shares are indirectly owned by Advent International GPE VII-H Limited Partnership, 11,828 shares are indirectly owned by Advent Partners GPE VII Limited Partnership, 29,570 shares are indirectly owned by Advent Partners GPE VII-A Limited Partnership, 289,771 shares are indirectly owned by Advent Partners GPE VII-B Cayman Limited Partnership, 260,204 shares are indirectly owned by Advent Partners GPE VII Cayman Limited Partnership and (CONTINUED IN NEXT FOOTNOTE)

F4 · ownership.nature: (CONTINUTED FROM PREVIOUS FOOTNOTE) 68,007 shares are indirectly owned by Advent Partners GPE VII-A Cayman Limited Partnership (collectively and together with certain other affiliates of Advent, the "Advent Entities"). The Reporting Person disclaims Section 16 beneficial ownership of the Shares except to the extent of his pecuniary interest therein, if any, and the reference to these Shares in this report shall not be deemed an admission of beneficial ownership of all of the Shares for purposes of Section 16 or any other purpose.