FORM 4
[ X ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

WATER STREET HEALTHCARE PARTNERS II LP 		2. Issuer Name and Ticker or Trading Symbol

RTI SURGICAL, INC. [ RTIX ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      __ X __ 10% Owner
_____ Officer (give title below)      _____ Other (specify below)
(Last)          (First)          (Middle)

444 WEST LAKE STREET, SUITE 1800 		3. Date of Earliest Transaction (MM/DD/YYYY)

3/8/2019
(Street)

CHICAGO, IL 60606
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

___ Form filed by One Reporting Person
_ X _ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8) 		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4) 		8. Price of Derivative Security
(Instr. 5) 		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Series A Preferred Stock   $4.39   (1) 3/8/2019     J   (2) (3)       50000      (1)   (1) Common Stock   15152761     (2) (3) 0   D   (4)  

Explanation of Responses:
(1)  The Series A Preferred Stock was convertible into Common Stock at a price of $4.39 per share, based on the aggregate liquidation value of the Series A Preferred Stock, which was approximately $66,520,618 as of March 8, 2019. The Series A Preferred Stock was subject to the terms and conditions of that certain Investment Agreement by and between the Issuer and WSHP Biologics Holdings, LLC, dated as of June 12, 2013, and that certain Certificate of Designation governing the Series A Preferred Stock, dated as of July 16, 2013, as amended and restated on August 1, 2018.
(2)  On March 8, 2019, pursuant to the Master Transaction Agreement, by and among Bears Holding Sub, Inc. ("New RTI"), the Issuer, PS Spine Holdco, LLC, a Delaware limited liability company (the "Member"), and Bears Merger Sub, Inc., a Delaware corporation (the "Merger Sub"): (a) the Merger Sub merged with and into the Issuer, with the Issuer surviving as a wholly-owned subsidiary of New RTI (the "Merger"); (b) the Member contributed all of the issued and outstanding membership interests of Paradigm Spine, LLC, a Delaware limited liability company and wholly owned subsidiary of the Member, to New RTI; and (c) New RTI was renamed "RTI Surgical Holdings, Inc."
(3)  Pursuant to the Master Transaction Agreement, at the effective time of the Merger each issued and outstanding share of Series A Preferred Stock of the Issuer converted automatically into one share of New RTI's Series A Convertible Preferred Stock.
(4)  The Series A Preferred Stock was held directly by WSHP Biologics Holdings, LLC. The managing member of WSHP Biologics Holdings, LLC is Water Street Healthcare Partners II, L.P., whose sole general partner is Water Street Healthcare Management II, L.P. The sole general partner of Water Street Healthcare Management II, L.P. is Water Street Healthcare Partners, LLC. Each of Water Street Healthcare Partners II, L.P., Water Street Healthcare Management II, L.P. and Water Street Healthcare Partners, LLC has disclaimed beneficial ownership of such shares of Series A Preferred Stock, except to the extent of its pecuniary interest therein.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
WATER STREET HEALTHCARE PARTNERS II LP
444 WEST LAKE STREET, SUITE 1800
CHICAGO, IL 60606
X

WATER STREET HEALTHCARE MANAGEMENT II, LP
444 WEST LAKE STREET, SUITE 1800
CHICAGO, IL 60606
X

WATER STREET HEALTHCARE PARTNERS, LLC
444 WEST LAKE STREET, SUITE 1800
CHICAGO, IL 60606
X


Signatures
WSHP BIOLOGICS HOLDINGS, LLC , By: /s/ Jeffrey Holway, Name: Jeffrey Holway, Its: Authorized Signatory 3/12/2019
** Signature of Reporting Person Date

WATER STREET HEALTHCARE PARTNERS II, L.P., By: Water Street Healthcare Management II, L.P., Its: GP, By: Water Street Healthcare Partners, LLC, Its: GP, By: /s/ Timothy Dugan, Name: Timothy Dugan, Its: Authorized Signatory 3/12/2019
** Signature of Reporting Person Date

WATER STREET HEALTHCARE MANAGEMENT II, L.P., By: Water Street Healthcare Partners, LLC, Its: General Partner, By: /s/ Timothy Dugan, Name: Timothy Dugan, Its: Authorized Signatory 3/12/2019
** Signature of Reporting Person Date

WATER STREET HEALTHCARE PARTNERS, LLC, By: /s/ Timothy Dugan, Name: Timothy Dugan, Its: Authorized Signatory 3/12/2019
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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