AnaptysBio subleases 45,057 sq ft San Diego space

AnaptysBio, Inc. entered into a sublease agreement with First Tracks Biotherapeutics covering approximately 45,057 rentable square feet at 10770 Wateridge Circle in San Diego, space that AnaptysBio leases under an existing master lease.

Rhea-AI Filing Summary

AnaptysBio, Inc. entered into a sublease agreement with First Tracks Biotherapeutics covering approximately 45,057 rentable square feet at 10770 Wateridge Circle in San Diego, space that AnaptysBio leases under an existing master lease.

The sublease began on June 15, 2026 and runs for 12 months, with First Tracks paying the same monthly Basic Rent and Additional Rent that AnaptysBio owes under the master lease, plus charges for any extra services it requests. AnaptysBio remains responsible to the master landlord for all lease obligations while First Tracks agrees to comply with master lease terms.

First Tracks may renew the sublease after the initial term for a period lasting until the earlier of April 4, 2028 or 12 months from the renewal start, and it can terminate at any time with at least three months’ written notice. The sublease is subordinate to the master lease and automatically ends if AnaptysBio’s master lease tenancy or possession ends.

8-K Event Classification

Item 1.01 — Entry into a Material Definitive Agreement

1 item

Item 1.01 Entry into a Material Definitive Agreement Business

The company signed a significant contract such as a merger agreement, credit facility, or major partnership.

Key Figures

Premises size: 45,057 rentable square feet Initial sublease term: 12 months Renewal outer date: April 4, 2028 +1 more

4 metrics

Premises size 45,057 rentable square feet Space subleased to First Tracks at 10770 Wateridge Circle

Initial sublease term 12 months From June 15, 2026 commencement date

Renewal outer date April 4, 2028 Latest possible end under renewal option

Termination notice 3 months Minimum prior written notice for First Tracks to terminate

Key Terms

Material Definitive Agreement, Sublease Agreement, Master Lease, Additional Rent, +1 more

5 terms

Material Definitive Agreement regulatory

"Item 1.01 Entry into a Material Definitive Agreement."

A material definitive agreement is a legally binding contract that creates major, long‑term obligations or rights for a company, such as loans, asset sales, mergers, or supplier deals. Think of it like a mortgage or lease for a business: it can change future cash flow, risk and control, so investors watch these agreements closely because they can materially affect a company’s value, financial health and stock price.

Sublease Agreement financial

"entered into a Sublease Agreement (the “Sublease”) with First Tracks"

Master Lease financial

"pursuant to the Lease dated May 4, 2020, as amended... (collectively, the “Master Lease”)."

A master lease is a single, overarching lease agreement that covers multiple properties or assets and sets the main terms for how they will be used, paid for, and maintained—like a master key that opens many doors at once. It matters to investors because it shapes where cash flows come from, who bears operating costs and risks, and how easy it is to sell, finance, or change the assets; a strong master lease can make income more predictable, while a restrictive one can limit flexibility and increase risk.

Additional Rent financial

"plus Additional Rent (as defined in the Master Lease) due under the Master Lease"

Termination Option financial

"other than in connection with the exercise of its Termination Option (as defined in the Master Lease)"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What agreement did AnaptysBio (ANAB) enter into with First Tracks Biotherapeutics?

AnaptysBio entered a sublease with First Tracks for 45,057 rentable square feet in San Diego. The space is part of AnaptysBio’s existing master lease at 10770 Wateridge Circle.

How long is the initial sublease term between AnaptysBio (ANAB) and First Tracks?

The initial sublease term runs for 12 months starting June 15, 2026. During this period, First Tracks occupies the premises and pays rent equivalent to the master lease obligations.

Can First Tracks extend its sublease from AnaptysBio (ANAB)?

First Tracks may extend the sublease after the initial term until the earlier of April 4, 2028 or 12 months from renewal. It must give written notice at least three months before the initial term ends.

Who is responsible for rent payments under AnaptysBio’s (ANAB) sublease arrangement?

First Tracks must pay monthly Basic Rent and Additional Rent matching AnaptysBio’s master lease obligations, plus certain service charges. AnaptysBio remains directly responsible to the master landlord for timely rent and compliance.

Under what conditions can First Tracks terminate its sublease with AnaptysBio (ANAB)?

First Tracks can terminate the sublease at any time during the term by giving at least three months’ prior written notice. The sublease also ends automatically if AnaptysBio’s master lease tenancy or possession terminates.

What restrictions apply to AnaptysBio’s master lease while the sublease with First Tracks is in place?

AnaptysBio agreed not to surrender or terminate the master lease before its scheduled expiration without First Tracks’ consent, except for a specified termination option, and not to amend it in ways that materially and adversely affect First Tracks.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 06/22/2026 - 04:05 PM EDT Learn about SEC filing dates

0001370053false00013700532026-06-152026-06-15

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): June 15, 2026

ANAPTYSBIO, INC.

(Exact name of Registrant as Specified in Its Charter)

Delaware			001-37985	20-3828755
(State or Other Jurisdiction of Incorporation)			(Commission File Number)	(IRS Employer Identification No.)
10770 Wateridge Circle, Suite 210
San Diego, California				92121
(Address of Principal Executive Offices)				(Zip Code)

Registrant’s Telephone Number, Including Area Code: 858 362-6295

N/A

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class		Trading Symbol(s)		Name of each exchange on which registered
Common stock, par value $0.001 per share		ANAB		The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 1.01 Entry into a Material Definitive Agreement.

On June 15, 2026, AnaptysBio, Inc. (the “Company”), entered into a Sublease Agreement (the “Sublease”) with First Tracks Biotherapeutics, Inc., a Delaware corporation (“First Tracks”), pursuant to which the Company agreed to sublease to First Tracks approximately 45,057 rentable square feet of space located at 10770 Wateridge Circle, San Diego, California 92121 (the “Premises”). The Premises are currently leased by the Company from Wateridge Property Owner, LP, a Delaware limited partnership (the “Master Landlord”), pursuant to the Lease dated May 4, 2020, as amended by the First Amendment to Lease Agreement dated April 5, 2021 (collectively, the “Master Lease”).

The term of the Sublease commenced on June 15, 2026, and continues for a period of twelve (12) months from commencement (the “Sublease Term”). First Tracks has the option to extend the Sublease Term for a renewal period commencing on the first day following the expiration of the initial Sublease Term and continuing until the earlier of (a) April 4, 2028, or (b) twelve months from the commencement of the renewal term, subject to delivery of written notice to the Company at least three months prior to the expiration of the initial Sublease Term. First Tracks also has the right to terminate the Sublease at any time during the Sublease Term upon at least three months’ prior written notice to the Company.

Under the Sublease, First Tracks is obligated to pay as monthly rent an amount equal to the monthly Basic Rent (as designated in the Master Lease) owed by the Company under the Master Lease, plus Additional Rent (as defined in the Master Lease) due under the Master Lease, payable in advance on the first day of each month during the Sublease Term. First Tracks is also responsible for any charges actually incurred for services requested by First Tracks that the Company is liable to the Master Landlord for under the Master Lease. The Company remains responsible for the timely payment of Basic Rent and Additional Rent under the Master Lease and for otherwise complying with its obligations under the Master Lease except to the extent assumed by First Tracks.

The Sublease is subordinate to the Master Lease, and First Tracks has agreed to comply with the applicable terms and provisions of the Master Lease as incorporated into the Sublease.

The Company has covenanted that it will not surrender or terminate the Master Lease prior to its scheduled expiration date without the consent of First Tracks (other than in connection with the exercise of its Termination Option (as defined in the Master Lease)), and will not amend or modify the Master Lease in any manner that would materially and adversely affect First Tracks’ rights or obligations under the Sublease. If the Company’s tenancy or right to possession under the Master Lease terminates for any reason, the Sublease will immediately cease and terminate.

The foregoing description of the Sublease does not purport to be complete and is subject to, and qualified in its entirety by, the full text of the Sublease, a copy of which will be filed with the Company’s transition report on Form 10-K/T for the transition period from January 1, 2026 to June 30, 2026.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

			ANAPTYSBIO, INC.
Date:	June 22, 2026	By:	/s/ Christopher M. Murphy
			Name: Christopher M. Murphy Title: Chief Financial Officer

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