T2 Biosystems (TTOO) SC 13G T2 Biosystems / CR ownership change

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

(Amendment No.                     )*

T2 Biosystems, Inc.

(Name of Issuer)

Common Stock, par value $0.001 per share

(Title of Class of Securities)

89853L203

(CUSIP Number)

July 3, 2023

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

☐ Rule 13d-1(b)

☒ Rule 13d-1(c)

☐ Rule 13d-1(d)

* The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No. 89853L203 Page 2 of 14

1.	Names of Reporting Persons   Nathan D. Hukill
2.	Check the Appropriate Box if a Member of a Group (See Instructions)   (a)  ☒ (1)        (b)  ☐
3.	SEC Use Only
4.	Citizenship or Place of Organization   United States

Number of Shares  Beneficially  Owned by Each Reporting Person With	5.	Sole Voting Power   0
	6.	Shared Voting Power   72,503,592
	7.	Sole Dispositive Power   0
	8.	Shared Dispositive Power   72,503,592

9.	Aggregate Amount Beneficially Owned by Each Reporting Person   72,503,592
10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)   ☐
11.	Percent of Class Represented by Amount in Row (9)   19.9% (2)
12.	Type of Reporting Person (See Instructions)   IN

(1) Nathan D. Hukill, CR Group L.P., CRG Partners III L.P., CRG Partners III Parallel Fund “A” L.P., CRG Partners III (Cayman) Unlev AIV I L.P., CRG Partners III (Cayman) Lev AIV I L.P., and CRG Partners III Parallel Fund “B” (Cayman) L.P. are members of a group for the purposes of this Schedule 13G.

(2) This percentage is calculated based on 290,195,720 shares of Common Stock issued and outstanding as of July 3, 2023, as provided by the Issuer, plus 24,157,794 shares of Common Stock issuable upon conversion of shares of Series B convertible preferred stock of the Issuer that are beneficially owned by the Reporting Persons.

CUSIP No. 89853L203 Page 3 of 14

1.	Names of Reporting Persons   CR Group L.P.
2.	Check the Appropriate Box if a Member of a Group (See Instructions)   (a)  ☒ (1)        (b)  ☐
3.	SEC Use Only
4.	Citizenship or Place of Organization   Delaware

Number of Shares  Beneficially  Owned by Each Reporting Person With	5.	Sole Voting Power   0
	6.	Shared Voting Power   72,503,592
	7.	Sole Dispositive Power   0
	8.	Shared Dispositive Power   72,503,592

9.	Aggregate Amount Beneficially Owned by Each Reporting Person   72,503,592
10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)   ☐
11.	Percent of Class Represented by Amount in Row (9)   19.9% (2)
12.	Type of Reporting Person (See Instructions)   IA

(1) Nathan D. Hukill, CR Group L.P., CRG Partners III L.P., CRG Partners III Parallel Fund ��A” L.P., CRG Partners III (Cayman) Unlev AIV I L.P., CRG Partners III (Cayman) Lev AIV I L.P., and CRG Partners III Parallel Fund “B” (Cayman) L.P. are members of a group for the purposes of this Schedule 13G.

(2) This percentage is calculated based on 290,195,720 shares of Common Stock issued and outstanding as of July 3, 2023, as provided by the Issuer, plus 24,157,794 shares of Common Stock issuable upon conversion of shares of Series B convertible preferred stock of the Issuer that are beneficially owned by the Reporting Persons.

CUSIP No. 89853L203 Page 4 of 14

1.	Names of Reporting Persons   CRG Partners III L.P.
2.	Check the Appropriate Box if a Member of a Group (See Instructions)   (a)  ☒ (1)        (b)  ☐
3.	SEC Use Only
4.	Citizenship or Place of Organization   Delaware

Number of Shares  Beneficially  Owned by Each Reporting Person With	5.	Sole Voting Power   0
	6.	Shared Voting Power   19,334,277
	7.	Sole Dispositive Power   0
	8.	Shared Dispositive Power   19,334,277

9.	Aggregate Amount Beneficially Owned by Each Reporting Person   19,334,277
10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)   ☐
11.	Percent of Class Represented by Amount in Row (9)   6.7% (2)
12.	Type of Reporting Person (See Instructions)   PN

(1) Nathan D. Hukill, CR Group L.P., CRG Partners III L.P., CRG Partners III Parallel Fund “A” L.P., CRG Partners III (Cayman) Unlev AIV I L.P., CRG Partners III (Cayman) Lev AIV I L.P., and CRG Partners III Parallel Fund “B” (Cayman) L.P. are members of a group for the purposes of this Schedule 13G.

(2) This percentage is calculated based on 290,195,720 shares of Common Stock issued and outstanding as of July 3, 2023, as provided by the Issuer.

CUSIP No. 89853L203 Page 5 of 14

1.	Names of Reporting Persons   CRG Partners III Parallel Fund “A” L.P.
2.	Check the Appropriate Box if a Member of a Group (See Instructions)   (a)  ☒ (1)        (b)  ☐
3.	SEC Use Only
4.	Citizenship or Place of Organization   Delaware

Number of Shares  Beneficially  Owned by Each Reporting Person With	5.	Sole Voting Power   0
	6.	Shared Voting Power   12,039,660
	7.	Sole Dispositive Power   0
	8.	Shared Dispositive Power   12,039,660

9.	Aggregate Amount Beneficially Owned by Each Reporting Person   12,039,660
10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)   ☐
11.	Percent of Class Represented by Amount in Row (9)   4.1% (2)
12.	Type of Reporting Person (See Instructions)   PN

(1) Nathan D. Hukill, CR Group L.P., CRG Partners III L.P., CRG Partners III Parallel Fund “A” L.P., CRG Partners III (Cayman) Unlev AIV I L.P., CRG Partners III (Cayman) Lev AIV I L.P., and CRG Partners III Parallel Fund “B” (Cayman) L.P. are members of a group for the purposes of this Schedule 13G.

(2) This percentage is calculated based on 290,195,720 shares of Common Stock issued and outstanding as of July 3, 2023, as provided by the Issuer.

CUSIP No. 89853L203 Page 6 of 14

1.	Names of Reporting Persons   CRG Partners III (Cayman) Unlev AIV I L.P.
2.	Check the Appropriate Box if a Member of a Group (See Instructions)   (a)  ☒ (1)        (b)  ☐
3.	SEC Use Only
4.	Citizenship or Place of Organization   Cayman Islands

Number of Shares  Beneficially  Owned by Each Reporting Person With	5.	Sole Voting Power   0
	6.	Shared Voting Power   3,866,855
	7.	Sole Dispositive Power   0
	8.	Shared Dispositive Power   3,866,855

9.	Aggregate Amount Beneficially Owned by Each Reporting Person   3,866,855
10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)   ☐
11.	Percent of Class Represented by Amount in Row (9)   1.3% (2)
12.	Type of Reporting Person (See Instructions)   PN

(1) Nathan D. Hukill, CR Group L.P., CRG Partners III L.P., CRG Partners III Parallel Fund “A” L.P., CRG Partners III (Cayman) Unlev AIV I L.P., CRG Partners III (Cayman) Lev AIV I L.P., and CRG Partners III Parallel Fund “B” (Cayman) L.P. are members of a group for the purposes of this Schedule 13G.

(2) This percentage is calculated based on 290,195,720 shares of Common Stock issued and outstanding as of July 3, 2023, as provided by the Issuer.

CUSIP No. 89853L203 Page 7 of 14

1.	Names of Reporting Persons   CRG Partners III (Cayman) Lev AIV I L.P.
2.	Check the Appropriate Box if a Member of a Group (See Instructions)   (a)  ☒ (1)        (b)  ☐
3.	SEC Use Only
4.	Citizenship or Place of Organization   United States

Number of Shares  Beneficially  Owned by Each Reporting Person With	5.	Sole Voting Power   0
	6.	Shared Voting Power   37,262,800
	7.	Sole Dispositive Power   0
	8.	Shared Dispositive Power   37,262,800

9.	Aggregate Amount Beneficially Owned by Each Reporting Person   37,262,800
10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)   ☐
11.	Percent of Class Represented by Amount in Row (9)   11.9% (2)
12.	Type of Reporting Person (See Instructions)   PN

(1) Nathan D. Hukill, CR Group L.P., CRG Partners III L.P., CRG Partners III Parallel Fund “A” L.P., CRG Partners III (Cayman) Unlev AIV I L.P., CRG Partners III (Cayman) Lev AIV I L.P., and CRG Partners III Parallel Fund “B” (Cayman) L.P. are members of a group for the purposes of this Schedule 13G.

(2) This percentage is calculated based on 290,195,720 shares of Common Stock issued and outstanding as of July 3, 2023, as provided by the Issuer, plus 24,157,794 shares of Common Stock issuable upon conversion of shares of Series B convertible preferred stock of the Issuer that are beneficially owned by the Reporting Persons.

CUSIP No. 89853L203 Page 8 of 14

1.	Names of Reporting Persons   CRG Partners III Parallel Fund “B” (Cayman) L.P.
2.	Check the Appropriate Box if a Member of a Group (See Instructions)   (a)  ☒ (1)        (b)  ☐
3.	SEC Use Only
4.	Citizenship or Place of Organization   United States

Number of Shares  Beneficially  Owned by Each Reporting Person With	5.	Sole Voting Power   0
	6.	Shared Voting Power   24,157,794
	7.	Sole Dispositive Power   0
	8.	Shared Dispositive Power   24,157,794

9.	Aggregate Amount Beneficially Owned by Each Reporting Person   24,157,794
10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)   ☐
11.	Percent of Class Represented by Amount in Row (9)   7.7% (2)
12.	Type of Reporting Person (See Instructions)   PN

(1) Nathan D. Hukill, CR Group L.P., CRG Partners III L.P., CRG Partners III Parallel Fund “A” L.P., CRG Partners III (Cayman) Unlev AIV I L.P., CRG Partners III (Cayman) Lev AIV I L.P., and CRG Partners III Parallel Fund “B” (Cayman) L.P. are members of a group for the purposes of this Schedule 13G.

(2) This percentage is calculated based on 290,195,720 shares of Common Stock issued and outstanding as of July 3, 2023, as provided by the Issuer, plus 24,157,794 shares of Common Stock issuable upon conversion of shares of Series B convertible preferred stock of the Issuer that are beneficially owned by the Reporting Persons.

CUSIP No. 89853L203 Page 9 of 14

Item 1.
	(a)	Name of Issuer T2 Biosystems, Inc.
	(b)	Address of Issuer’s Principal Executive Offices 101 Hartwell Avenue, Lexington, MA 02421
Item 2.
	(a)	Name of Person Filing This Schedule 13G is filed jointly by the following persons (each a “Reporting Person” and collectively, the “Reporting Persons”): Nathan D. Hukill CR Group L.P. CRG Partners III L.P. CRG Partners III Parallel Fund “A” L.P. CRG Partners III (Cayman) Unlev AIV I L.P. CRG Partners III (Cayman) Lev AIV I L.P. CRG Partners III Parallel Fund “B” (Cayman) L.P.
		CR Group L.P. may be deemed to beneficially own the shares by virtue of its position as the investment manager for CRG Partners III L.P., CRG Partners III Parallel Fund “A” L.P., CRG Partners III (Cayman) Unlev AIV I L.P., CRG Partners III (Cayman) Lev AIV I L.P. and CRG Partners III Parallel Fund “B” (Cayman) L.P. Mr. Hukill may be deemed to have beneficial ownership over the securities by virtue of his indirect control of CR Group L.P.
	(b)	Address of Principal Business Office or, if none, Residence The address of the principal business office of each of the Reporting Persons is 1000 Main Street, Suite 2500, Houston, TX 77002.
	(c)	Citizenship See Row 4 of the cover page for each Reporting Person.
	(d)	Title of Class of Securities Common Stock, par value $0.001 per share
	(e)	CUSIP Number 89853L203
Item 3.	If this statement is filed pursuant to §§240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
	Not applicable

CUSIP No. 89853L203 Page 10 of 14

Item 4.	Ownership
	(a)	Amount beneficially owned:
		Nathan D. Hukill	72,503,592 (1)
		CR Group L.P.	72,503,592 (1)
		CRG Partners III L.P.	19,334,277
		CRG Partners III Parallel Fund “A” L.P.	12,039,660
		CRG Partners III (Cayman) Unlev AIV I L.P.	3,866,855
		CRG Partners III (Cayman) Lev AIV I L.P.	37,262,800 (1)
		CRG Partners III Parallel Fund “B” (Cayman) L.P.	24,157,794 (1)
	(b)	Percent of class:
		Nathan D. Hukill	19.9% (2)
		CR Group L.P.	19.9% (2)
		CRG Partners III L.P.	6.7% (2)
		CRG Partners III Parallel Fund “A” L.P.	4.1% (2)
		CRG Partners III (Cayman) Unlev AIV I L.P.	1.3% (2)
		CRG Partners III (Cayman) Lev AIV I L.P.	12.8% (2)
		CRG Partners III Parallel Fund “B” (Cayman) L.P.	8.3% (2)
	(c)	Number of shares as to which the person has:
		(i) Sole power to vote or to direct the vote:
		Nathan D. Hukill	0
		CR Group L.P.	0
		CRG Partners III L.P.	0
		CRG Partners III Parallel Fund “A” L.P.	0
		CRG Partners III (Cayman) Unlev AIV I L.P. CRG Partners III (Cayman) Lev AIV I L.P.	0 0
		CRG Partners III Parallel Fund “B” (Cayman) L.P.	0
		(ii)  Shared power to vote or to direct the vote:
		Nathan D. Hukill	72,503,592 (1)
		CR Group L.P.	72,503,592 (1)
		CRG Partners III L.P.	19,334,277
		CRG Partners III Parallel Fund “A” L.P.	12,039,660
		CRG Partners III (Cayman) Unlev AIV I L.P.	3,866,855
		CRG Partners III (Cayman) Lev AIV I L.P.		37,262,800	(1)
		CRG Partners III Parallel Fund “B” (Cayman) L.P.		24,157,794	(1)
		(iii)  Sole power to dispose or to direct the disposition of:
		Nathan D. Hukill		0
		CR Group L.P.		0
		CRG Partners III L.P.		0
		CRG Partners III Parallel Fund “A” L.P.		0
		CRG Partners III (Cayman) Unlev AIV I L.P. CRG Partners III (Cayman) Lev AIV I L.P.		0 0
		CRG Partners III Parallel Fund “B” (Cayman) L.P.		0

CUSIP No. 89853L203 Page 11 of 14

		(iv) Shared power to dispose or to direct the disposition of:
		Nathan D. Hukill	72,503,592	(1)
		CR Group L.P.	72,503,592	(1)
		CRG Partners III L.P.	19,334,277
		CRG Partners III Parallel Fund “A” L.P.	12,039,660
		CRG Partners III (Cayman) Unlev AIV I L.P.	3,866,855
		CRG Partners III (Cayman) Lev AIV I L.P.	37,262,800	(1)
		CRG Partners III Parallel Fund “B” (Cayman) L.P.	24,157,794	(1)
	(1)	Includes 24,157,794 shares of Common Stock issuable upon conversion of shares of Series B Convertible Preferred Stock.
	(2)	This percentage is calculated based on 290,195,720 shares of Common Stock issued and outstanding as of July 3, 2023, as provided by the Issuer, plus 24,157,794 shares of Common Stock issuable upon conversion of shares of Series B convertible preferred stock of the Issuer that are beneficially owned by the Reporting Persons.
Item 5.	Ownership of Five Percent or Less of a Class
	If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following  ☐
Item 6.	Ownership of More than Five Percent on Behalf of Another Person
	Not applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company or Control Person
	Not applicable

Item 8.	Identification and Classification of Members of the Group
	Not applicable
Item 9.	Notice of Dissolution of Group
	Not applicable
Item 10.	Certification
	By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having such purpose or effect.

CUSIP No. 89853L203 Page 12 of 14

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Dated: July 13, 2023

Nathan D. Hukill

/s/ Nathan D. Hukill

An individual

CR Group L.P.

CRG Partners III L.P.

CRG Partners III Parallel Fund “A” L.P.

CRG Partners III (Cayman) Unlev AIV I L.P.

CRG Partners III (Cayman) Lev AIV I L.P.

CRG Partners III Parallel Fund “B” (Cayman) L.P.

By:	/s/ Nathan D. Hukill
	Nathan D. Hukill, authorized signatory

CUSIP No. 89853L203 Page 13 of 14

EXHIBITS

A: Joint Filing Agreement