# EDGAR Filing Document

**Accession Number:** 0001739410
**File Stem:** 0001193125-23-025652
**Filing Date:** 2023-2
**Character Count:** 28749
**Document Hash:** e22051ef7b9876f8b249c2dbc4f348a8
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-23-025652.hdr.sgml**: 20230206

**ACCESSION NUMBER**: 0001193125-23-025652

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

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20230206

**DATE AS OF CHANGE**: 20230206

**GROUP MEMBERS**: NEW LEAF BIOPHARMA OPPORTUNITIES II, L.P.

**GROUP MEMBERS**: NEW LEAF BPO ASSOCIATES II, L.P.

**GROUP MEMBERS**: NEW LEAF BPO MANAGEMENT II, L.L.C.

**GROUP MEMBERS**: NEW LEAF VENTURE ASSOCIATES III, L.P.

**GROUP MEMBERS**: NEW LEAF VENTURE MANAGEMENT III, L.L.C.

**GROUP MEMBERS**: RONALD HUNT

**GROUP MEMBERS**: VIJAY LATHI

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Rallybio Corp
- **CENTRAL INDEX KEY:** 0001739410
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **IRS NUMBER:** 851083789
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SC 13G/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-92742
- **FILM NUMBER:** 23591137

**BUSINESS ADDRESS:**
- **STREET 1:** 234 CHURCH STREET
- **STREET 2:** SUITE 1020
- **CITY:** NEW HAVEN
- **STATE:** CT
- **ZIP:** 06510
- **BUSINESS PHONE:** 203- 859-3820

**MAIL ADDRESS:**
- **STREET 1:** 234 CHURCH STREET
- **STREET 2:** SUITE 1020
- **CITY:** NEW HAVEN
- **STATE:** CT
- **ZIP:** 06510

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Rallybio Holdings, LLC
- **DATE OF NAME CHANGE:** 20180502
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** New Leaf Ventures III, L.P.
- **CENTRAL INDEX KEY:** 0001625653
- **IRS NUMBER:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

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

**BUSINESS ADDRESS:**
- **STREET 1:** C/O NEW LEAF VENTURE PARTNERS
- **STREET 2:** 7 TIMES SQUARE, SUITE 3502
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10036
- **BUSINESS PHONE:** 646-871-6400

**MAIL ADDRESS:**
- **STREET 1:** C/O NEW LEAF VENTURE PARTNERS
- **STREET 2:** 7 TIMES SQUARE, SUITE 3502
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10036

------

------

**UNITED STATES** 

**SECURITIES AND EXCHANGE COMMISSION** 

**Washington, D.C. 20549** 

------

**SCHEDULE 13G** 

**Under the Securities Exchange Act of 1934** 

**(Amendment No. 1)\*** 

------

## Rallybio Corporation
**(Name of Issuer)** 

**Common Stock, $0.0001 par value per share** 

**(Title of Class of Securities)** 

**75120L100** 

**(CUSIP Number)** 

**December 31, 2022** 

**(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 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. 75120L100 13G

1. &nbsp;&nbsp;&nbsp;&nbsp; NAMES OF REPORTING PERSONS &nbsp;&nbsp;&nbsp;&nbsp; New Leaf Ventures III, L.P.

2. &nbsp;&nbsp;&nbsp;&nbsp; CHECK THE APPROPRIATE BOX
IF A MEMBER OF A GROUP (see instructions) &nbsp;&nbsp;&nbsp;&nbsp; (a) ☐ (b) ☒

3. &nbsp;&nbsp;&nbsp;&nbsp; SEC USE ONLY

4. &nbsp;&nbsp;&nbsp;&nbsp; CITIZENSHIP OR PLACE OF
ORGANIZATION &nbsp;&nbsp;&nbsp;&nbsp; Delaware

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 5. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 6. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;2,147,757 (1) |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 7. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 8. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;2,147,757 (1) |

---

9. &nbsp;&nbsp;&nbsp;&nbsp; AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; 2,147,757 (1)

10. &nbsp;&nbsp;&nbsp;&nbsp; CHECK IF THE AGGREGATE
AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (see instructions) &nbsp;&nbsp;&nbsp;&nbsp; ☐

11. &nbsp;&nbsp;&nbsp;&nbsp; PERCENT OF CLASS
REPRESENTED BY AMOUNT IN ROW (9) &nbsp;&nbsp;&nbsp;&nbsp; 5.8% (2)

12. &nbsp;&nbsp;&nbsp;&nbsp; TYPE OF REPORTING PERSON
(see instructions) &nbsp;&nbsp;&nbsp;&nbsp; PN

(1) All such shares are held of record by NLV-III (as defined in Item 2(a)
of the Original Schedule 13G). NLVM-III (as defined in Item 2(a) of the Original Schedule 13G) is the general partner of NLVA-III (as defined in Item 2(a) of the
Original Schedule 13G), which is the general partner of NLV-III. Each of NLVM-III and NLVA-III may be deemed to have voting,
investment and dispositive power with respect to these securities. Ronald Hunt, a member of the Issuer's board of directors, and Vijay Lathi are the managing members of NLVM-III and may each be deemed to
share voting, investment and dispositive power with respect to these securities.

(2) Based on 37,091,399 shares of the Issuer's Common Stock outstanding immediately after the Issuer's
public offering (excluding the underwriter's option to purchase an additional 1,250,000 shares), as reported in the Issuer's prospectus on Form 424(b)(5) and filed with the Securities and Exchange Commission (the "Commission") on
November 14, 2022 (the "Prospectus").

------

CUSIP No. 75120L100 13G

1. &nbsp;&nbsp;&nbsp;&nbsp; NAMES OF REPORTING PERSONS &nbsp;&nbsp;&nbsp;&nbsp; New Leaf Venture Associates III, L.P.

2. &nbsp;&nbsp;&nbsp;&nbsp; CHECK THE APPROPRIATE BOX
IF A MEMBER OF A GROUP (see instructions) &nbsp;&nbsp;&nbsp;&nbsp; (a) ☐ (b) ☒

3. &nbsp;&nbsp;&nbsp;&nbsp; SEC USE ONLY

4. &nbsp;&nbsp;&nbsp;&nbsp; CITIZENSHIP OR PLACE OF
ORGANIZATION &nbsp;&nbsp;&nbsp;&nbsp; Delaware

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 5. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 6. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;2,147,757 (1) |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 7. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 8. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;2,147,757 (1) |

---

9. &nbsp;&nbsp;&nbsp;&nbsp; AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; 2,147,757 (1)

10. &nbsp;&nbsp;&nbsp;&nbsp; CHECK IF THE AGGREGATE
AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (see instructions) &nbsp;&nbsp;&nbsp;&nbsp; ☐

11. &nbsp;&nbsp;&nbsp;&nbsp; PERCENT OF CLASS
REPRESENTED BY AMOUNT IN ROW (9) &nbsp;&nbsp;&nbsp;&nbsp; 5.8% (2)

12. &nbsp;&nbsp;&nbsp;&nbsp; TYPE OF REPORTING PERSON
(see instructions) &nbsp;&nbsp;&nbsp;&nbsp; PN

(1) All such shares are held of record by NLV-III. NLVM-III is the general partner of NLVA-III, which is the general partner of NLV-III. Each of NLVM-III and NLVA-III may be deemed to have voting, investment and dispositive power with respect to these securities. Ronald Hunt, a member of the Issuer's board
of directors, and Vijay Lathi are the managing members of NLVM-III and may each be deemed to share voting, investment and dispositive power with respect to these securities.

(2) Based on 37,091,399 shares of the Issuer's Common Stock outstanding immediately following the
Issuer's public offering, as reported in the Prospectus.

------

CUSIP No. 75120L100 13G

1. &nbsp;&nbsp;&nbsp;&nbsp; NAMES OF REPORTING PERSONS &nbsp;&nbsp;&nbsp;&nbsp; New Leaf Venture Management III, L.L.C.

2. &nbsp;&nbsp;&nbsp;&nbsp; CHECK THE APPROPRIATE BOX
IF A MEMBER OF A GROUP (see instructions) &nbsp;&nbsp;&nbsp;&nbsp; (a) ☐ (b) ☒

3. &nbsp;&nbsp;&nbsp;&nbsp; SEC USE ONLY

4. &nbsp;&nbsp;&nbsp;&nbsp; CITIZENSHIP OR PLACE OF
ORGANIZATION &nbsp;&nbsp;&nbsp;&nbsp; Delaware

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 5. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 6. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;2,147,757 (1) |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 7. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 8. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;2,147,757 (1) |

---

9. &nbsp;&nbsp;&nbsp;&nbsp; AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; 2,147,757 (1)

10. &nbsp;&nbsp;&nbsp;&nbsp; CHECK IF THE AGGREGATE
AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (see instructions) &nbsp;&nbsp;&nbsp;&nbsp; ☐

11. &nbsp;&nbsp;&nbsp;&nbsp; PERCENT OF CLASS
REPRESENTED BY AMOUNT IN ROW (9) &nbsp;&nbsp;&nbsp;&nbsp; 5.8% (2)

12. &nbsp;&nbsp;&nbsp;&nbsp; TYPE OF REPORTING PERSON
(see instructions) &nbsp;&nbsp;&nbsp;&nbsp; 00

(1) All such shares are held of record by NLV-III. NLVM-III is the general partner of NLVA-III, which is the general partner of NLV-III. Each of NLVM-III and NLVA-III may be deemed to have voting, investment and dispositive power with respect to these securities. Ronald Hunt, a member of the Issuer's board
of directors, and Vijay Lathi are the managing members of NLVM-III and may each be deemed to share voting, investment and dispositive power with respect to these securities.

(2) Based on 37,091,399 shares of the Issuer's Common Stock outstanding immediately following the
Issuer's public offering, as reported in the Prospectus.

------

CUSIP No. 75120L100 13G

1. &nbsp;&nbsp;&nbsp;&nbsp; NAMES OF REPORTING PERSONS &nbsp;&nbsp;&nbsp;&nbsp; New Leaf Biopharma Opportunities II, L.P.

2. &nbsp;&nbsp;&nbsp;&nbsp; CHECK THE APPROPRIATE BOX
IF A MEMBER OF A GROUP (see instructions) &nbsp;&nbsp;&nbsp;&nbsp; (a) ☐ (b) ☒

3. &nbsp;&nbsp;&nbsp;&nbsp; SEC USE ONLY

4. &nbsp;&nbsp;&nbsp;&nbsp; CITIZENSHIP OR PLACE OF
ORGANIZATION &nbsp;&nbsp;&nbsp;&nbsp; Delaware

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 5. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 6. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;1,153,846 (1) |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 7. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 8. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;1,153,846 (1) |

---

9. &nbsp;&nbsp;&nbsp;&nbsp; AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; 1,153,846 (1)

10. &nbsp;&nbsp;&nbsp;&nbsp; CHECK IF THE AGGREGATE
AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (see instructions) &nbsp;&nbsp;&nbsp;&nbsp; ☐

11. &nbsp;&nbsp;&nbsp;&nbsp; PERCENT OF CLASS
REPRESENTED BY AMOUNT IN ROW (9) &nbsp;&nbsp;&nbsp;&nbsp; 3.1% (2)

12. &nbsp;&nbsp;&nbsp;&nbsp; TYPE OF REPORTING PERSON
(see instructions) &nbsp;&nbsp;&nbsp;&nbsp; PN

(1) All such shares are held of record by NL BPO-II (as defined in Item
2(a) of the Original Schedule 13G). NL BPOM-II (as defined in Item 2(a) of the Original Schedule 13G) is the general partner of NL BPOA-II (as defined in Item 2(a) of
the Original Schedule 13G), which is the general partner of NL BPO-II. Each of NL BPOM-II and NL BPOA-II may be deemed to have
voting, investment and dispositive power with respect to these securities. Ronald Hunt, a member of the Issuer's board of directors, and Vijay Lathi are the managing members of NL BPOM-II and may each be
deemed to share voting, investment and dispositive power with respect to these securities.

(2) Based on 37,091,399 shares of the Issuer's Common Stock outstanding immediately following the
Issuer's public offering, as reported in the Prospectus.

------

CUSIP No. 75120L100 13G

1. &nbsp;&nbsp;&nbsp;&nbsp; NAMES OF REPORTING PERSONS &nbsp;&nbsp;&nbsp;&nbsp; New Leaf BPO Associates II, L.P.

2. &nbsp;&nbsp;&nbsp;&nbsp; CHECK THE APPROPRIATE BOX
IF A MEMBER OF A GROUP (see instructions) &nbsp;&nbsp;&nbsp;&nbsp; (a) ☐ (b) ☒

3. &nbsp;&nbsp;&nbsp;&nbsp; SEC USE ONLY

4. &nbsp;&nbsp;&nbsp;&nbsp; CITIZENSHIP OR PLACE OF
ORGANIZATION &nbsp;&nbsp;&nbsp;&nbsp; Delaware

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 5. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 6. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;1,153,846 (1) |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 7. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 8. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;1,153,846 (1) |

---

9. &nbsp;&nbsp;&nbsp;&nbsp; AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; 1,153,846 (1)

10. &nbsp;&nbsp;&nbsp;&nbsp; CHECK IF THE AGGREGATE
AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (see instructions) &nbsp;&nbsp;&nbsp;&nbsp; ☐

11. &nbsp;&nbsp;&nbsp;&nbsp; PERCENT OF CLASS
REPRESENTED BY AMOUNT IN ROW (9) &nbsp;&nbsp;&nbsp;&nbsp; 3.1% (2)

12. &nbsp;&nbsp;&nbsp;&nbsp; TYPE OF REPORTING PERSON
(see instructions) &nbsp;&nbsp;&nbsp;&nbsp; PN

(1) All such shares are held of record by NL BPO-II. NL BPOM-II is the general partner of NL BPOA-II, which is the general partner of NL BPO-II. Each of NL BPOM-II and NL BPOA-II may be deemed to have voting, investment and dispositive power with respect to these securities. Ronald Hunt, a member of the Issuer's board
of directors, and Vijay Lathi are the managing members of NL BPOM-II and may each be deemed to share voting, investment and dispositive power with respect to these securities.

(2) Based on 37,091,399 shares of the Issuer's Common Stock outstanding immediately following the
Issuer's public offering, as reported in the Prospectus.

------

CUSIP No. 75120L100 13G

1. &nbsp;&nbsp;&nbsp;&nbsp; NAMES OF REPORTING PERSONS &nbsp;&nbsp;&nbsp;&nbsp; New Leaf BPO Management II, L.L.C.

2. &nbsp;&nbsp;&nbsp;&nbsp; CHECK THE APPROPRIATE BOX
IF A MEMBER OF A GROUP (see instructions) &nbsp;&nbsp;&nbsp;&nbsp; (a) ☐ (b) ☒

3. &nbsp;&nbsp;&nbsp;&nbsp; SEC USE ONLY

4. &nbsp;&nbsp;&nbsp;&nbsp; CITIZENSHIP OR PLACE OF
ORGANIZATION &nbsp;&nbsp;&nbsp;&nbsp; Delaware

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 5. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 6. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;1,153,846 (1) |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 7. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 8. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;1,153,846 (1) |

---

9. &nbsp;&nbsp;&nbsp;&nbsp; AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; 1,153,846 (1)

10. &nbsp;&nbsp;&nbsp;&nbsp; CHECK IF THE AGGREGATE
AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (see instructions) &nbsp;&nbsp;&nbsp;&nbsp; ☐

11. &nbsp;&nbsp;&nbsp;&nbsp; PERCENT OF CLASS
REPRESENTED BY AMOUNT IN ROW (9) &nbsp;&nbsp;&nbsp;&nbsp; 3.1% (2)

12. &nbsp;&nbsp;&nbsp;&nbsp; TYPE OF REPORTING PERSON
(see instructions) &nbsp;&nbsp;&nbsp;&nbsp; OO

(1) All such shares are held of record by NL BPO-II. NL BPOM-II is the general partner of NL BPOA-II, which is the general partner of NL BPO-II. Each of NL BPOM-II and NL BPOA-II may be deemed to have voting, investment and dispositive power with respect to these securities. Ronald Hunt, a member of the Issuer's board
of directors, and Vijay Lathi are the managing members of NL BPOM-II and may each be deemed to share voting, investment and dispositive power with respect to these securities.

(2) Based on 37,091,399 shares of the Issuer's Common Stock outstanding immediately following the
Issuer's public offering, as reported in the Prospectus.

------

CUSIP No. 75120L100 13G

1. &nbsp;&nbsp;&nbsp;&nbsp; NAMES OF REPORTING PERSONS &nbsp;&nbsp;&nbsp;&nbsp; Ronald Hunt

2. &nbsp;&nbsp;&nbsp;&nbsp; CHECK THE APPROPRIATE BOX
IF A MEMBER OF A GROUP (see instructions) &nbsp;&nbsp;&nbsp;&nbsp; (a) ☐ (b) ☒

3. &nbsp;&nbsp;&nbsp;&nbsp; SEC USE ONLY

4. &nbsp;&nbsp;&nbsp;&nbsp; CITIZENSHIP OR PLACE OF
ORGANIZATION &nbsp;&nbsp;&nbsp;&nbsp; United States of
America

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 5. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE VOTING POWER<br>21,532 shares of Common Stock underlying fully vested stock options, or stock options that fully vest within 60 days of December 31, 2022, owned directly by Hunt. |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 6. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;3,301,603 (1) |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 7. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE DISPOSITIVE POWER<br>21,532 shares of Common Stock underlying fully vested stock options, or stock options that fully vest within 60 days of December 31, 2022, owned directly by Hunt. |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 8. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;3,301,603 (1) |

---

9. &nbsp;&nbsp;&nbsp;&nbsp; AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; 3,323,135 (1)

10. &nbsp;&nbsp;&nbsp;&nbsp; CHECK IF THE AGGREGATE
AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (see instructions) &nbsp;&nbsp;&nbsp;&nbsp; ☐

11. &nbsp;&nbsp;&nbsp;&nbsp; PERCENT OF CLASS
REPRESENTED BY AMOUNT IN ROW (9) &nbsp;&nbsp;&nbsp;&nbsp; 8.9% (2)

12. &nbsp;&nbsp;&nbsp;&nbsp; TYPE OF REPORTING PERSON
(see instructions) &nbsp;&nbsp;&nbsp;&nbsp; IN

(1) Consists of (i) 2,147,757 shares of the Issuer's Common Stock held by NLV-III and (ii) 1,153,846 shares of the Issuer's Common Stock held by NL BPO-II. NLVM-III is the general partner of NLVA-III, which is the general partner of NLV-III. Each of NLVM-III and NLVA-III may be deemed
to have voting, investment and dispositive power with respect to the shares held by NLV-III. NL BPOM-II is the general partner of NL BPOA-II, which is the general partner of NL BPO-II. Each of NL BPOM-II and NL BPOA-II may
be deemed to have voting, investment and dispositive power with respect to the shares held by NL BPO-II. Ronald Hunt, a member of the Issuer's board of directors, and Vijay Lathi are managing members of
each of NLVM-III and NL BPOM-II and may be deemed to have voting, investment and dispositive power with respect to the shares held by each of NLV-III and NL BPO-II.

(2) Based on 37,112,931 shares of the Issuer's Common Stock, calculated as follows (i) 37,091,399 shares of
the Issuer's Common Stock outstanding immediately following the Issuer's public offering, as reported in the Prospectus plus (ii) 21,532 shares of the Issuer's Common Stock underlying fully vested stock options or options that will
become fully vested within 60 days of December 31, 2022, granted to Hunt in his capacity as a member of the Issuer's board of directors.

------

CUSIP No. 75120L100 13G

1. &nbsp;&nbsp;&nbsp;&nbsp; NAMES OF REPORTING PERSONS &nbsp;&nbsp;&nbsp;&nbsp; Vijay Lathi

2. &nbsp;&nbsp;&nbsp;&nbsp; CHECK THE APPROPRIATE BOX
IF A MEMBER OF A GROUP (see instructions) &nbsp;&nbsp;&nbsp;&nbsp; (a) ☐ (b) ☒

3. &nbsp;&nbsp;&nbsp;&nbsp; SEC USE ONLY

4. &nbsp;&nbsp;&nbsp;&nbsp; CITIZENSHIP OR PLACE OF
ORGANIZATION &nbsp;&nbsp;&nbsp;&nbsp; United States of
America

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 5. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 6. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;3,301,603 (1) |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 7. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 8. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;3,301,603 (1) |

---

9. &nbsp;&nbsp;&nbsp;&nbsp; AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; 3,301,603 (1)

10. &nbsp;&nbsp;&nbsp;&nbsp; CHECK IF THE AGGREGATE
AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (see instructions) &nbsp;&nbsp;&nbsp;&nbsp; ☐

11. &nbsp;&nbsp;&nbsp;&nbsp; PERCENT OF CLASS
REPRESENTED BY AMOUNT IN ROW (9) &nbsp;&nbsp;&nbsp;&nbsp; 8.9% (2)

12. &nbsp;&nbsp;&nbsp;&nbsp; TYPE OF REPORTING PERSON
(see instructions) &nbsp;&nbsp;&nbsp;&nbsp; IN

(1) Consists of (i) 2,147,757 shares of the Issuer's Common Stock held by NLV-III and (ii) 1,153,846 shares of the Issuer's Common Stock held by NL BPO-II. NLVM-III is the general partner of NLVA-III, which is the general partner of NLV-III. Each of NLVM-III and NLVA-III may be deemed
to have voting, investment and dispositive power with respect to the shares held by NLV-III. NL BPOM-II is the general partner of NL BPOA-II, which is the general partner of NL BPO-II. Each of NL BPOM-II and NL BPOA-II may
be deemed to have voting, investment and dispositive power with respect to the shares held by NL BPO-II. Ronald Hunt, a member of the Issuer's board of directors, and Vijay Lathi are managing members of
each of NLVM-III and NL BPOM-II and may be deemed to have voting, investment and dispositive power with respect to the shares held by each of NLV-III and NL BPO-II.

(2) Based on 37,091,399 shares of the Issuer's Common Stock outstanding immediately following the
Issuer's public offering, as reported in the Prospectus.

------

CUSIP No. 75120L100 13G

**Introductory Note**: This Amendment No. 1 (the "Amendment") amends and supplements the Schedule 13G originally filed by the Reporting Persons with the Commission on February 11, 2022 (the "Original Schedule 13G"). Only those items that are hereby reported are amended; all other items reported in the Original Schedule 13G remain unchanged. Information given in response to each item shall be deemed incorporated by reference in all other items, as applicable. Capitalized terms not defined in this Amendment have the meanings ascribed to them in the Original Schedule 13G.

**Item 4.** **Ownership.** <br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) Amount beneficially owned:

See Row 9 of the cover page for each Reporting Person.\*

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) Percent of class:

See Row 11 of the cover page for each Reporting Person and the corresponding footnotes.\*

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) Number of shares as to which the person has:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) Sole power to vote or to direct the vote

See Row 5 of the cover page for each Reporting Person and the corresponding footnotes.\*

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) Shared power to vote or to direct the vote

See Row 6 of the cover page for each Reporting Person and the corresponding footnotes.\*

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii) Sole power to dispose or to direct the disposition of

See Row 7 of the cover page for each Reporting Person and the corresponding footnotes.\*

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iv) Shared power to dispose or to direct the disposition of

See Row 8 of the cover page for each Reporting Person and the corresponding footnotes.\*

\* Except to the extent of his, her or its pecuniary interest therein, each Reporting Person disclaims beneficial ownership of such shares of Common Stock, except for the shares, if any, such Reporting Person holds of record.

------

CUSIP No. 75120L100 13G

**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: February 6, 2023

---

| | |
|:---|:---|
| NEW LEAF VENTURES III, L.P. | NEW LEAF VENTURES III, L.P. |
| By: | New Leaf Venture Associates III, L.P. |
| Its: | General Partner |
| By: | New Leaf Venture Management III, L.L.C. |
| Its: | General Partner |
| By: | /s/ Craig L. Slutzkin |
|  | Craig L. Slutzkin |
| Its: | Chief Financial Officer |
| NEW LEAF VENTURE ASSOCIATES III, L.P. | NEW LEAF VENTURE ASSOCIATES III, L.P. |
| By: | New Leaf Venture Management III, L.L.C. |
| Its: | General Partner |
| By: | /s/ Craig L. Slutzkin |
|  | Craig L. Slutzkin |
| Its: | Chief Financial Officer |
| NEW LEAF VENTURE MANAGEMENT III, L.L.C. | NEW LEAF VENTURE MANAGEMENT III, L.L.C. |
| By: | /s/ Craig L. Slutzkin |
|  | Craig L. Slutzkin |
| Its: | Chief Financial Officer |
| NEW LEAF BIOPHARMA OPPORTUNITIES II, L.P. | NEW LEAF BIOPHARMA OPPORTUNITIES II, L.P. |
| By: | New Leaf BPO Associates II, L.P. |
| Its: | General Partner |
| By: | New Leaf BPO Management II, L.L.C. |
| Its: | General Partner |
| By: | /s/ Craig L. Slutzkin |
|  | Craig L. Slutzkin |
| Its: | Chief Financial Officer |

---

------

CUSIP No. 75120L100 13G

---

| | |
|:---|:---|
| NEW LEAF BPO ASSOCIATES II, L.P. | NEW LEAF BPO ASSOCIATES II, L.P. |
| By: | New Leaf BPO Management II, L.L.C. |
| Its: | General Partner |
| By: | /s/ Craig L. Slutzkin |
|  | Craig L. Slutzkin |
| Its: | Chief Financial Officer |
| NEW LEAF BPO MANAGEMENT II, L.L.C. | NEW LEAF BPO MANAGEMENT II, L.L.C. |
| By: | /s/ Craig L. Slutzkin |
|  | Craig L. Slutzkin |
| Its: | Chief Financial Officer |
| \* | \* |
| Ronald Hunt | Ronald Hunt |
| \* | \* |
| Vijay Lathi | Vijay Lathi |
| \*By: | /s/ Craig L. Slutzkin |
| Name: | Craig L. Slutzkin |
|  | Attorney-in-Fact |

---

[\*This Schedule 13G was executed by Craig L. Slutzkin on behalf of the individuals listed above pursuant to Powers of Attorney. Note that copies of the applicable Powers of Attorney are already on file with the appropriate agencies.]