# EDGAR Filing Document

**Accession Number:** 0001298709
**File Stem:** 0001298709-26-000007
**Filing Date:** 2026-5
**Character Count:** 13059
**Document Hash:** b678624c356be199951b7ba4c9959b1f
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001298709-26-000007.hdr.sgml**: 20260504

**ACCESSION NUMBER**: 0001298709-26-000007

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13G/A

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20260504

**DATE AS OF CHANGE**: 20260504

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Krystal Biotech, Inc.
- **CENTRAL INDEX KEY:** 0001711279
- **STANDARD INDUSTRIAL CLASSIFICATION:** BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 821080209
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13G/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-90133
- **FILM NUMBER:** 26934595

**BUSINESS ADDRESS:**
- **STREET 1:** 2100 WHARTON STREET
- **STREET 2:** SUITE 701
- **CITY:** PITTSBURGH
- **STATE:** PA
- **ZIP:** 15203
- **BUSINESS PHONE:** (412) 586-5830

**MAIL ADDRESS:**
- **STREET 1:** 2100 WHARTON STREET
- **STREET 2:** SUITE 701
- **CITY:** PITTSBURGH
- **STATE:** PA
- **ZIP:** 15203
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Krishnan Krish S
- **CENTRAL INDEX KEY:** 0001298709

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13G/A

**MAIL ADDRESS:**
- **STREET 1:** 2100 WHARTON STREET
- **STREET 2:** SUITE 701
- **CITY:** PITTSBURGH
- **STATE:** PA
- **ZIP:** 15203

## Exhibit 99.1

![](jointfilingagreement001.jpg)

Exhibit 99.1 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing of Amendment No. 3 to Schedule 13G and any and all further amendments thereto with respect to the Common Stock, par value $0.00001 per share, of Krystal Biotech, Inc., and further agree that this Joint Filing Agreement be included as an exhibit to such filing. In addition, each party to this Joint Filing Agreement expressly authorizes the other party to file Amendment No. 3 to Schedule 13G and any and all further amendments thereto on his or her behalf. The undersigned further agree that each party hereto is responsible for the timely filing of Amendment No. 3 to Schedule 13G and any and all further amendments thereto, and for the completeness and accuracy of the information concerning such party contained therein; provided that no party is responsible for the completeness or accuracy of the information concerning any other party, unless such party knows or has reason to believe that such information is inaccurate. IN WITNESS WHEREOF, the undersigned hereby execute this Joint Filing Agreement as of this 4th day of May 2026. By: /s/ Krish S. Krishnan By: /s/ Suma M. Krishnan Name: Krish S. Krishnan Name: Suma M. Krishnan Title: Chairman & CEO, Krystal Biotech, Inc. Title: President, R&D, Krystal Biotech, Inc.

------

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## SCHEDULE 13G

### Under the Securities Exchange Act of 1934

**(Amendment No. 3)**

**Issuer:** Krystal Biotech, Inc. (the "Company")

**Title of Class of Securities:** Common Stock, $0.00001 par value ("Common Stock")

**CUSIP Number:** —

**Date of Event Which Requires Filing of this Statement:** 03/31/2026

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

- [ ] Rule 13d-1(b)

- [ ] Rule 13d-1(c)

- [x] Rule 13d-1(d)

---

| 1. | Names of Reporting Persons<br>Krish S. Krishnan | Names of Reporting Persons<br>Krish S. Krishnan |
|:---|:---|:---|:---|
| 2. | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] |
| 3. | SEC Use Only | SEC Use Only |
| 4. | Citizenship or Place of Organization<br>X1 | Citizenship or Place of Organization<br>X1 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>3388283.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>3388283.00 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>3388283.00 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>3388283.00 |
| 10. | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] |
| 11. | Percent of Class Represented by Amount in Row (9)<br>11.5% | Percent of Class Represented by Amount in Row (9)<br>11.5% |
| 12. | Type of Reporting Person (See Instructions)<br>IN | Type of Reporting Person (See Instructions)<br>IN |

---

| 1. | Names of Reporting Persons<br>Suma M. Krishnan | Names of Reporting Persons<br>Suma M. Krishnan |
|:---|:---|:---|:---|
| 2. | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] |
| 3. | SEC Use Only | SEC Use Only |
| 4. | Citizenship or Place of Organization<br>X1 | Citizenship or Place of Organization<br>X1 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>3388283.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>3388283.00 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>3388283.00 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>3388283.00 |
| 10. | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] |
| 11. | Percent of Class Represented by Amount in Row (9)<br>11.5% | Percent of Class Represented by Amount in Row (9)<br>11.5% |
| 12. | Type of Reporting Person (See Instructions)<br>IN | Type of Reporting Person (See Instructions)<br>IN |

---

**Item 1(a). Name of Issuer:**
Krystal Biotech, Inc. (the "Company")

**Item 1(b). Address of Issuer's Principal Executive Offices:**
2100 Wharton Street, Suite  701,  Pittsburgh, Pennsylvania, 15203

**Item 2(a). Name of Person Filing:**
The Reporting Persons, Mr. Krish S. Krishnan and his wife, Mrs. Suma M. Krishnan, each filed a Schedule 13G on April 4, 2018, which were both then amended on February 19, 2019, and February 14, 2020 (the "Individual 13Gs"). The Reporting Persons are now reporting together on this Schedule 13G/A, which is deemed to be the 3rd Amendment to the Individual 13Gs.

**Item 2(b). Address of Principal Business Office:**
c/o KRYSTAL BIOTECH, INC.
2100 WHARTON STREET
SUITE 701
PITTSBURGH, PA 15203

**Item 2(c). Citizenship:**
Mr. and Mrs. Krishnan are citizens of the United States of America.

**Item 2(d). Title of Class of Securities:**
Common Stock, $0.00001 par value ("Common Stock")

**Item 2(e). CUSIP Number:**
—

**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:**

(a) [ ] Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o).

(b) [ ] Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).

(c) [ ] Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c).

(d) [ ] Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8).

(e) [ ] An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);

(f) [ ] An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);

(g) [ ] A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);

(h) [ ] A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

(i) [ ] A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);

(j) [ ] A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), if filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:

(k) [ ] Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).

**Item 4. Ownership:**

**(a) Amount beneficially owned:**

Each of the Reporting Persons may be deemed to be the beneficial owner of an aggregate 3,388,283 shares of the Company's Common Stock as set forth in more detail in response to Item 4(c) below.

**(b) Percent of class:**

11.5%
The percentage was calculated in accordance with Rule 13d-3(d)(1)(i) promulgated under the  Securities Exchange Act of 1934, as amended (the "Exchange Act") based on an aggregate total of 29,479,756  shares of Common Stock outstanding as of April 29, 2026, as reported by the Company in its Form 10-Q filed with the U.S. Securities and Exchange Commission on May 4, 2026.

**(c) Number of shares as to which the person has:**

**(i) Sole power to vote or to direct the vote:**

Krish S. Krishnan:         0 shares of Common Stock
Suma M. Krishnan:       0 shares of Common Stock

**(ii) Shared power to vote or to direct the vote:**

Krish S. Krishnan:      3,388,283 shares of Common Stock
Suma M. Krishnan:    3,388,283 shares of Common Stock
The reported securities are directly held as follows:
(i)  1,475,253 shares of Common Stock directly owned by Krish S. Krishnan;
(ii)  1,403,155 shares of Common Stock directly owned by Suma M. Krishnan;
(iii)  90,000 shares of Common Stock that are directly owned by the SMK Trust FBO KSK, an irrevocable trust established by Mrs. Krishnan for the benefit of Mr. Krishnan who serves as a co-trustee and shares voting and dispositive power with a 3rd party co-trustee. These shares of Common Stock are not beneficially owned by Mrs. Krishnan but are included to disclose the aggregate holdings of both Reporting Persons;
(iv)  90,000 shares of Common Stock that are directly owned by the Krishnan Spousal Trust, an irrevocable trust established by Mr. Krishnan for the benefit of Mrs. Krishnan who serves as a co-trustee and shares voting and dispositive power with a 3rd party co-trustee. These shares of Common Stock are not beneficially owned by Mr. Krishnan but are included to disclose the aggregate holdings of both Reporting Persons;
(v)  50,000 shares of Common Stock owned by the Krishnan Family Trust, a revocable trust established for the benefit of Mr. and Mrs. Krishnan who share voting and investment control of the trust;
(v)  158,525 shares of Common Stock issuable upon the exercise of stock options held by Mr. Krishnan; and
(vi)  121,350 shares of Common Stock issuable upon the exercise of stock options held by Mrs. Krishnan.
The Reporting Persons may be deemed to share beneficial ownership of the reported securities, but the filing of this Statement shall not be construed as an admission of such beneficial ownership for purposes of Section 13(d) or 13(g) of the Exchange Act or for any other purpose.

**(iii) Sole power to dispose or to direct the disposition of:**

Krish S. Krishnan:         0 shares of Common Stock
Suma M. Krishnan:       0 shares of Common Stock

**(iv) Shared power to dispose or to direct the disposition of:**

Krish S. Krishnan:      3,388,283 shares of Common Stock
Suma M. Krishnan:    3,388,283 shares of Common Stock
See Item 4(c)(ii) above, which is incorporated herein by reference.

**Item 5. Ownership of Five Percent or Less of a Class.**

[x] 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 5 Percent on Behalf of Another Person.**

Not Applicable

**Item 7. Identification and Classification of the Subsidiary**

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:**

—

### 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.

**Krish S. Krishnan**

**Date:** 05/04/2026

**By:** /s/ Krish S. Krishnan

**Name & Title:** Krish S. Krishnan/Chariman & CEO

**Suma M. Krishnan**

**Date:** 05/04/2026

**By:** /s/Suma M. Krishnan

**Name & Title:** Suma M. Krishnan/Director, President R&D