SCHEDULE 13G

CUSIP No.

07373V105

1

Names of Reporting Persons

ARCH Venture Fund IX, L.P.

2

Check the appropriate box if a member of a Group (see instructions)

(a)

(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 0.00
6	Shared Voting Power 4,540,132.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 4,540,132.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

4,540,132.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

11

Percent of class represented by amount in row (9)

4.5 %

12

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13G

CUSIP No.

07373V105

1

Names of Reporting Persons

ARCH Venture Fund IX Overage, L.P.

2

Check the appropriate box if a member of a Group (see instructions)

(a)

(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 0.00
6	Shared Voting Power 4,540,132.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 4,540,132.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

4,540,132.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

11

Percent of class represented by amount in row (9)

4.5 %

12

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13G

CUSIP No.

07373V105

1

Names of Reporting Persons

ARCH Venture Partners IX, L.P.

2

Check the appropriate box if a member of a Group (see instructions)

(a)

(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 0.00
6	Shared Voting Power 4,540,132.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 4,540,132.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

4,540,132.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

11

Percent of class represented by amount in row (9)

4.5 %

12

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13G

CUSIP No.

07373V105

1

Names of Reporting Persons

ARCH Venture Partners IX Overage, L.P.

2

Check the appropriate box if a member of a Group (see instructions)

(a)

(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 0.00
6	Shared Voting Power 4,540,132.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 4,540,132.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

4,540,132.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

11

Percent of class represented by amount in row (9)

4.5 %

12

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13G

CUSIP No.

07373V105

1

Names of Reporting Persons

ARCH Venture Partners IX, LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)

(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 0.00
6	Shared Voting Power 4,540,132.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 4,540,132.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

4,540,132.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

11

Percent of class represented by amount in row (9)

4.5 %

12

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13G

CUSIP No.

07373V105

1

Names of Reporting Persons

Keith Crandell

2

Check the appropriate box if a member of a Group (see instructions)

(a)

(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 17,730.00
6	Shared Voting Power 4,540,132.00
7	Sole Dispositive Power 17,730.00
8	Shared Dispositive Power 4,540,132.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

4,557,862.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

11

Percent of class represented by amount in row (9)

4.5 %

12

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13G

CUSIP No.

07373V105

1

Names of Reporting Persons

Clinton Bybee

2

Check the appropriate box if a member of a Group (see instructions)

(a)

(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 10,498.00
6	Shared Voting Power 4,540,132.00
7	Sole Dispositive Power 10,498.00
8	Shared Dispositive Power 4,540,132.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

4,550,630.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

11

Percent of class represented by amount in row (9)

4.5 %

12

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13G

CUSIP No.

07373V105

1

Names of Reporting Persons

Robert Nelsen

2

Check the appropriate box if a member of a Group (see instructions)

(a)

(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 60,615.00
6	Shared Voting Power 4,540,132.00
7	Sole Dispositive Power 60,615.00
8	Shared Dispositive Power 4,540,132.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

4,600,747.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

11

Percent of class represented by amount in row (9)

4.6 %

12

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13G

Item 1.

(a)

Name of issuer:

Beam Therapeutics Inc.

(b)

Address of issuer's principal executive offices:

238 Main Street, Cambridge, MA 02142

Item 2.

(a)

Name of person filing:

ARCH Venture Fund IX, L.P. ("AVF IX"); ARCH Venture Partners IX, L.P. ("AVP IX LP"); ARCH Venture Partners IX, LLC ("AVP IX LLC"); ARCH Venture Fund IX Overage, L.P. ("AVF IX Overage"); ARCH Venture Partners IX Overage, L.P. ("AVP IX Overage GP") (collectively, the "Reporting Entities" and individually, each a "Reporting Entity"); and Keith Crandell ("Crandell"), Robert Nelsen ("Nelsen") and Clinton Bybee ("Bybee") (collectively, the "Managing Directors" and individually, each a "Managing Director"). The Reporting Entities and the Managing Directors collectively are referred to as the "Reporting Persons".

(b)

Address or principal business office or, if none, residence:

8755 W. Higgins Avenue, Suite 1025, Chicago, IL 60631

(c)

Citizenship:

Each of AVF IX, AVP IX LP, AVF IX Overage and AVP IX Overage GP, are limited partnerships organized under the laws of the State of Delaware. AVP IX LLC is a limited liability company organized under the laws of the State of Delaware. Each Managing Director is a US citizen.

(d)

Title of class of securities:

Common Stock par value $0.01 per share

(e)

CUSIP No.:

07373V105

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 5.

Ownership of 5 Percent or Less of a Class.

Ownership of 5 percent or less of a class

Item 6.

Ownership of more than 5 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.

Certifications:

Not Applicable

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.

ARCH Venture Fund IX, L.P.

Signature:	ARCH Venture Partners IX, L.P.
Name/Title:	its General Partner
Date:	05/15/2025

Signature:	ARCH Venture Partners IX, LLC
Name/Title:	its General Partner
Date:	05/15/2025

Signature:	/s/ Mark McDonnell
Name/Title:	* Mark McDonnell, as Attorney-in-Fact for Keith Crandell, Managing Director
Date:	05/15/2025

ARCH Venture Fund IX Overage, L.P.

Signature:	ARCH Venture Partners IX Overage, L.P.
Name/Title:	its General Partner
Date:	05/15/2025

Signature:	ARCH Venture Partners IX, LLC
Name/Title:	its General Partner
Date:	05/15/2025

Signature:	/s/ Mark McDonnell
Name/Title:	* Mark McDonnell, as Attorney-in-Fact for Keith Crandell, Managing Director
Date:	05/15/2025

ARCH Venture Partners IX, L.P.

Signature:	ARCH Venture Partners IX, LLC
Name/Title:	its General Partner
Date:	05/15/2025

Signature:	/s/ Mark McDonnell
Name/Title:	* Mark McDonnell, as Attorney-in-Fact for Keith Crandell, Managing Director
Date:	05/15/2025

ARCH Venture Partners IX Overage, L.P.

Signature:	ARCH Venture Partners IX, LLC
Name/Title:	its General Partner
Date:	05/15/2025

Signature:	/s/ Mark McDonnell
Name/Title:	* Mark McDonnell, as Attorney-in-Fact for Keith Crandell, Managing Director
Date:	05/15/2025

ARCH Venture Partners IX, LLC

Signature:	/s/ Mark McDonnell
Name/Title:	* Mark McDonnell, as Attorney-in-Fact for Keith Crandell, Managing Director
Date:	05/15/2025

Keith Crandell

Signature:	/s/ Mark McDonnell
Name/Title:	* Mark McDonnell, as Attorney-in-Fact for Keith Crandell
Date:	05/15/2025

Clinton Bybee

Signature:	/s/ Mark McDonnell
Name/Title:	* Mark McDonnell, as Attorney-in-Fact for Clinton Bybee
Date:	05/15/2025

Robert Nelsen

Signature:	/s/ Mark McDonnell
Name/Title:	* Mark McDonnell, as Attorney-in-Fact for Robert Nelsen
Date:	05/15/2025

Comments accompanying signature: * This Schedule 13G was executed by Mark McDonnell pursuant to a Power of Attorney filed as Exhibit 24 to the Form 3 relating to the beneficial ownership of shares of Beam Therapeutics, Inc. by the Reporting Persons filed with the Securities Exchange Commission on February 5, 2020 and incorporated herein in its entirety by reference.