[SCHEDULE 13D] CollPlant Biotechnologies Ltd SEC Filing

Rhea-AI Filing Summary

CollPlant Biotechnologies Ltd (CLGN) Schedule 13D shows members of the Loewenbaum family and related trusts collectively beneficially own 1,698,533 ordinary shares, representing 13.4% of outstanding shares based on 12,716,014 shares outstanding as of June 30, 2025. Individual holdings disclosed include George W. Loewenbaum with 1,256,056 shares (9.9%), Lillian S. Loewenbaum with 186,289 shares (1.5%), and several trusts and entities holding the remainder. Recent open-market purchases in late July 2025 at prices from $2.25 to $2.41 are reported. The stated purpose is investment; no present plans to effect corporate changes, but the group will continue to review its position. A Joint Filing Agreement governs the filing.

Positive

• Material disclosed stake: Reporting Persons beneficially own 1,698,533 shares (13.4%), a significant minority position.
• Transparent reporting: Schedule 13D includes detailed ownership breakdowns, recent purchase prices ($2.25–$2.41), and a Joint Filing Agreement.
• Incremental open-market purchases: Recent buys in July 2025 show continued accumulation rather than sudden block trades.

Negative

• None.

Insights

Financial Analyst

TL;DR: A family block reaching 13.4% is material and could influence liquidity and shareholder dynamics, but no active control bid is declared.

The Loewenbaum group holds a significant minority stake in CollPlant at 13.4%, disclosed under Schedule 13D, which is large enough to be noticed by the market and other shareholders. Reported purchases in July 2025 at $2.25–$2.41 indicate incremental accumulation rather than a single block acquisition. The filing expressly states the holdings are for investment and that there are currently no plans to pursue specified corporate actions, though the group reserves the right to reassess based on market conditions and issuer developments.

Corporate Governance Expert

TL;DR: Disclosure is complete and compliant; the Joint Filing Agreement indicates coordinated reporting among related parties.

The Schedule 13D includes required identity, ownership percentages, and a Joint Filing Agreement, showing coordinated beneficial ownership reporting by family members and trusts. The filing discloses sole voting and dispositive power for the reported positions and confirms no legal proceedings affecting reporting persons. While they disclaim present plans for corporate action, their transparency preserves regulatory compliance and gives other investors clear notice of a substantial shareholder group.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

CollPlant Biotechnologies Ltd

(Name of Issuer)

Ordinary Shares, par value NIS 1.5 per share

(Title of Class of Securities)

19516R107

(CUSIP Number)

Lillian S. Loewenbaum
1000 Westbank Dr, Ste #2A,
Austin, TX, 78746
512-423-5857

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

09/30/2025

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on 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).

SCHEDULE 13D

CUSIP No. 19516R107

1

Name of reporting person

Loewenbaum Lilian S.

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

PF

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 186,289.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 186,289.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

186,289.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

1.5 %

14

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person:

See Item 11: Consists of (a) 25,000 shares of the Issuer's ordinary shares underlying ADSs held in the Lillian Shaw Loewenbaum Trust, and (b) 161,289 shares of the Issuer's ordinary shares underlying ADSs held by the Reporting Person directly.

SCHEDULE 13D

CUSIP No. 19516R107

1

Name of reporting person

George Walter Loewenbaum

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

PF

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 1,256,056.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 1,256,056.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

1,256,056.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

9.9 %

14

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person:

See Item 11: Consists of (a) 65,000 shares of the Issuer's ordinary shares underlying American Depository Shares ("ADSs") held by the Walter Loewenbaum Trust, (b) 220,917 ordinary shares underlying ADSs held by the Reporting Person directly, and (c) 970,139 ordinary shares underlying ADSs held by the Reporting Person in an IRA.

SCHEDULE 13D

CUSIP No. 19516R107

1

Name of reporting person

Elizabeth S. Loewenbaum

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

PF

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 20,688.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 20,688.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

20,688.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

0.2 %

14

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13D

CUSIP No. 19516R107

1

Name of reporting person

The Loewenbaum 1992 Trust

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

PF

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

TEXAS

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 170,000.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 170,000.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

170,000.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

1.3 %

14

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13D

CUSIP No. 19516R107

1

Name of reporting person

The Waterproof Partnership, Ltd.

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

PF

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

TEXAS

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 35,000.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 35,000.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

35,000.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

0.3 %

14

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13D

CUSIP No. 19516R107

1

Name of reporting person

The Loewenbaum Residence Trust FBO Anna Loewenbaum

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

PF

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

TEXAS

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 15,000.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 15,000.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

15,000.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

0.1 %

14

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13D

CUSIP No. 19516R107

1

Name of reporting person

The Elizabeth Scott Loewenbaum 1992 Trust

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

PF

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

TEXAS

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 15,000.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 15,000.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

15,000.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

0.1 %

14

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13D

Item 1.	Security and Issuer
(a)	Title of Class of Securities: Ordinary Shares, par value NIS 1.5 per share
(b)	Name of Issuer: CollPlant Biotechnologies Ltd
(c)	Address of Issuer's Principal Executive Offices: 4 Oppenheimer St, Weizmann Science Park, Rehovot, ISRAEL , 7670104.
Item 2.	Identity and Background
(a)	The Waterproof Partnership, Ltd., The Loewenbaum 1992 Trust, The Loewenbaum Residence Trust FBO Anna Loewenbaum and The Elizabeth Scott Loewenbaum 1992 Trust are collectively referred to as the "Reporting Entities" and each as a "Reporting Entity." George Walter Loewenbaum, Elizabeth S. Loewenbaum and Lilian S. Loewenbaum are referred to herein as the "Individual Filers" and each, an "Individual Filer". The Individual Filers and the Reporting Entities are collectively referred to herein as the "Reporting Persons". The Waterproof Partnership, Ltd., a holding company, is a Texas limited partnership, with George Walter Loewenbaum and Lilian S. Loewenbaum serving as general partners. The Loewenbaum 1992 Trust, a holding company, is a Texas trust, with George Walter Loewenbaum and Lilian S. Loewenbaum serving as trustees. The Loewenbaum Residence Trust FBO Anna Loewenbaum, a holding company, is a Texas trust, with George Walter Loewenbaum and Lilian S. Loewenbaum serving as trustees. The Elizabeth Scott Loewenbaum 1992 Trust, a holding company, is a Texas trust, with George Walter Loewenbaum and Lilian S. Loewenbaum serving as trustees.
(b)	The address of each Reporting Person is 1000 Westbank Dr, Ste #2A, Austin, TX 78746. George Walter Loewenbaum, Elizabeth S. Loewenbaum and Lilian S. Loewenbaum are citizens of the United States and their current occupations are individual private investors.
(c)	Refer (b) above
(d)	During the last five years, none of the Reporting Persons nor any general partner or trustee of the Reporting Entities (a) has been convicted in a criminal proceeding (excluding traffic violations and similar misdemeanors), or (b) was a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violations with respect to such laws.
(e)	Refer (d) above
(f)	Refer (b) above
Item 3.	Source and Amount of Funds or Other Consideration
	The information concerning the ownership of Ordinary Shares of the Reporting Persons set forth on the cover pages hereto is expressly incorporated by reference herein.
Item 4.	Purpose of Transaction
	The acquisitions of Ordinary Shares by the Reporting Persons for investment purposes. While the Reporting Persons do not have any present plans or proposals that relate to or would result in any of the actions specified in clauses (a) through (j) of Item 4 of Schedule 13D, the Reporting Persons intend to review their investment in the Issuer on a continuing basis and, depending upon the price of and other market conditions relating to the Ordinary Shares or other securities of the Issuer, subsequent developments affecting the Issuer, the Issuer's business and prospects, other investment and business opportunities available to the Reporting Persons, general stock market and economic conditions, tax considerations, and other factors deemed relevant, may form a plan or proposal to take any of the actions specified in clauses (a) through (j) of Item 4 of Schedule 13D, in which case the Reporting Persons will file an amendment to this Schedule 13D.
Item 5.	Interest in Securities of the Issuer
(a)	The information concerning the ownership of Ordinary Shares of the Reporting Persons set forth on the cover pages hereto is expressly incorporated by reference herein. To the best knowledge of the Reporting Persons, as of June 30, 2025, there were 12,716,014 Ordinary Shares outstanding (which number was set forth in the Issuer's Form 6-K filed by the Issuer with the SEC on August 20, 2025). The calculations of percentages in this Schedule 13D are based on the number of shares of Ordinary Shares outstanding on June 30, 2025 plus the shares that may be issued to the Reporting Persons within 60 days upon the exercise of options and warrants. Collectively, the Reporting Persons beneficially own in the aggregate 1,698,533 Ordinary Shares, representing 13.4% of the total outstanding Ordinary Shares (including the shares that may be issued to the Reporting Persons within 60 days upon the exercise of options and warrants).
(b)	The information concerning the ownership of Ordinary Shares of the Reporting Persons set forth on the cover pages hereto is expressly incorporated by reference herein.
(c)	During the past sixty days, the Reporting Persons have not effected any transactions involving the Ordinary Shares except for the following: * The Loewenbaum Residence Trust FBO Anna Loewenbaum purchased 200 Ordinary Shares underlying ADSs on the open market on July 28, 2025 for $2.33 per share; * The Elizabeth Scott Loewenbaum 1992 Trust purchased 300 Ordinary Shares underlying ADSs on the open market on July 28, 2025 for $2.29 per share; and * George Walter Loewenbaum purchased: (a) 4,206 Ordinary Shares underlying ADSs through the Walter Loewenbaum Trust on the open market on July 29, 2025 at a weighted average price of $2.41 per share; (b) 1,668 Ordinary Shares underlying ADSs directly on the open market July 30, 2025 for $2.31 per share; (c) 1,200 Ordinary Shares underlying ADSs through an IRA on the open market on July 25, 2025 for $2.27 per share; (d) 4,700 Ordinary Shares underlying ADSs through an IRA on the open market on July 28, 2025 for a weighted average price per share of $2.25; (e) 9,739 Ordinary Shares underlying ADSs through an IRA on the open market on July 30, 2025 for a weighted average price per share of $2.38; and (f) 139 Ordinary Shares underlying ADSs through an IRA on the open market on July 31, 2025 for $2.37 per share.
(d)	Except as listed in Item 5(a), to the best knowledge of the Reporting Persons, no person other than the Reporting Persons has the right to receive, or the power to direct the receipt of dividends from, or the power to direct the receipt of proceeds of the sale of the shares of Common Stock beneficially owned by the Reporting Persons.
(e)	not applicable
Item 6.	Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer
	The Reporting Persons have entered into a Joint Filing Agreement, dated January 28, 2025, a copy of which is attached hereto as Exhibit 1 to this Schedule 13D and is incorporated herein by reference.
Item 7.	Material to be Filed as Exhibits.
	1. Joint Filing Agreement dated January 28, 2025 (incorporated by reference to Exhibit A to the Schedule 13G/A filed by the Reporting Persons on January 28, 2025).

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.

Loewenbaum Lilian S.

Signature:	/s/ Lillian S. Loewenbaum
Name/Title:	Lillian S. Loewenbaum
Date:	09/30/2025

George Walter Loewenbaum

Signature:	/s/ George Walter Loewenbaum
Name/Title:	George Walter Loewenbaum
Date:	09/30/2025

Elizabeth S. Loewenbaum

Signature:	/s/ Elizabeth Loewenbaum
Name/Title:	Elizabeth Loewenbaum
Date:	09/30/2025

The Loewenbaum 1992 Trust

Signature:	/s/ George Walter Loewenbaum
Name/Title:	George Walter Loewenbaum/Trustee
Date:	09/30/2025

Signature:	/s/ Lillian S. Loewenbaum
Name/Title:	Lillian S. Loewenbaum/Trustee
Date:	09/30/2025

The Waterproof Partnership, Ltd.

Signature:	/s/ George Walter Loewenbaum
Name/Title:	George Walter Loewenbaum/General Partner
Date:	09/30/2025

Signature:	/s/ Lillian S. Loewenbaum
Name/Title:	Lillian S. Loewenbaum/General Partner
Date:	09/30/2025

The Loewenbaum Residence Trust FBO Anna Loewenbaum

Signature:	/s/ George Walter Loewenbaum
Name/Title:	George Walter Loewenbaum/Trustee
Date:	09/30/2025

Signature:	/s/ Lillian S. Loewenbaum
Name/Title:	Lillian S. Loewenbaum/Trustee
Date:	09/30/2025

The Elizabeth Scott Loewenbaum 1992 Trust

Signature:	/s/ George Walter Loewenbaum
Name/Title:	George Walter Loewenbaum/Trustee
Date:	09/30/2025

Signature:	/s/ Lillian S. Loewenbaum
Name/Title:	Lillian S. Loewenbaum/Trustee
Date:	09/30/2025

FAQ

What stake does the Loewenbaum group hold in CollPlant (CLGN)?

The Reporting Persons collectively beneficially own 1,698,533 ordinary shares, representing 13.4% of outstanding shares as of June 30, 2025.

Does the Schedule 13D indicate the Loewenbaum group plans to seek control of CollPlant (CLGN)?

No; the filing states the acquisitions are for investment purposes and the Reporting Persons currently have no present plans or proposals to take actions specified in Item 4, while reserving the right to reassess.

What recent transactions did the Reporting Persons make in CollPlant (CLGN) shares?

Multiple open-market purchases in late July 2025 were disclosed with prices ranging from $2.25 to $2.41 per share, including purchases by George W. Loewenbaum and certain family trusts.

Who holds the largest individual position among the filers in CollPlant (CLGN)?

George W. Loewenbaum holds the largest reported position with 1,256,056 shares, representing 9.9% of the class.

Is there any legal or regulatory disclosure affecting the Reporting Persons in this Schedule 13D?

The filing states that during the last five years none of the Reporting Persons or related partners/trustees were convicted of a crime or subject to securities-related judgments; no legal proceedings are disclosed.