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APGEApogee Therapeutics, Inc.Nasdaq

Revenue participation right purchase and sale agreement with BXLS (Annapurna Aggregator L.P.)

8-KStrategic TransactionneutralImpact65

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Provides immediate non‑equity liquidity ($100M upfront) and removes the company's prior cash‑runway guidance, reducing near‑term financing risk. However, the revenue participation creates an obligation to pay a portion of future product revenues (zumilokibart) to BXLS—potentially substantial if sales are high—which could materially affect long‑term revenue retention and valuation. Key open items: exact tranche mechanics, buy‑back options, triggers (including regulatory milestones like FDA approval), cap mechanics (Tranche 4 cap of $1.0B referenced), and whether future tranches will be funded

On May 26, 2026 Apogee Therapeutics, Inc. entered into a Revenue Participation Right Purchase and Sale Agreement with Annapurna Aggregator L.P. (affiliated with Blackstone Life Sciences). BXLS paid $100.0 million upfront (Tranche 1 Funding) for rights to tiered revenue share payments. The agreement contemplates additional purchases (reference to $200.0 million and a Tranche 4 funding option of $250.0 million at the Company's election, with references to up to $400.0 million) and tiered revenue percentages across sales tiers (table snippets show percentages such as 0.9375%, 2.50%, 3.4375% and references to tiers up to $5 billion and $8 billion). The Company issued a press release (Exhibit 99.1) and removed its cash runway end-date guidance as a result of the transaction

Score65

Score Rationale

neutral

Material financing transaction ($100M upfront) with multi‑tranche potential (additional $200M and optional $250M–$400M) and removal of cash-runway guidance; impacts near-term liquidity and creates long-term revenue-sharing obligations—feed-level investor relevance.

Bullish

  • Immediate $100.0M upfront funding improves near-term liquidity and led the company to remove cash-runway guidance.
  • Structure provides additional committed funding options (references to $200M and optional Tranche 4 funding between $250M–$400M), implying continued financing runway without immediate equity issuance.

Bearish

  • Revenue participation reduces future net receipts from zumilokibart sales (tiered percentages and caps referenced), potentially lowering long‑term revenue and cash flow retention.
  • Complex tranche and cap mechanics (e.g., Tranche 4 cap of $1.0 billion) could lead to significant future payments if product achieves high sales; full economic impact depends on undisclosed details.
  • Transaction may include regulatory/milestone triggers (e.g., FDA-related Tranche 4 Trigger references to Dec 31, 2030) that could accelerate payments or obligations.
  • Item 1.01 Entry into a Material Definitive Agreement. Revenue Participation Right Purchase and Sale Agreement On May 26, 2026 (the “Effective Date”), Apogee Therapeutics, Inc. (the “Company”) entered into a revenue participation right purchase and sale agreement (the “Revenue Share Agreement”) with Annapurna Aggregator L.P., an affiliate of funds managed by Blackstone Life Sciences (“BXLS”). Pursuant to the Revenue Share Agreement, in exchange for an upfront payment of $100.0 million (the “Tranche 1 Funding”), BXLS purchased from the Company the right to receive tiered revenue share payments (the “Revenu...
  • Item 7.01 Regulation FD Disclosure. Press Release On May 27, 2026, the Company issued a press release announcing the Revenue Share Agreement. Supplemental Financial Information As a result of entering into the transactions described in Item 1.01 of this Current Report on Form 8-K (this “Report”), the Company is removing its cash runway end date guidance. A copy of the press release is furnished as Exhibit 99.1 to this Report and is incorporated by reference herein.
  • Table-like facts: Percentage ... Up to and including $5 billion (“Tier 1”) ... 0.9375% ... 2.50% ... 3.4375% (table-like excerpt from exhibit).
  • Tranche 4 Revenue Percentage is subject to a cap of $1.0 billion in aggregate Tranche 4-related Revenue Share Payments to BXLS, after which the Tranche 4 Revenue Percentage for Tier 1 decreases to 0.00%.
  1. Full executed agreement or definitive term sheet to be included in future filings (review Exhibit 99.1 text and any 10-Q/10-K amendments for complete economic terms).
  2. Whether BXLS funds additional tranches (the referenced $200M purchase and optional Tranche 4 election of $250M–$400M) and the timing of those funding events.
  3. Disclosure of buy‑back options, milestone/approval triggers (e.g., the Dec 31, 2030 FDA trigger reference) and precise cap/calculation mechanics for revenue share payments.
  4. Impact on projected revenue and cash flow models for zumilokibart and updated guidance or sensitivity provided in upcoming investor communications or 10-Q.
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Original Filing Text

SEC filing text preserved from the raw item store.

### 8-K - FORM 8-K
0001974640

2026-05-26
2026-05-26

iso4217:USD

xbrli:shares

iso4217:USD

xbrli:shares

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):
May 26, 2026

Apogee
Therapeutics, Inc.

(Exact Name of Registrant as Specified in Its
Charter)

Delaware |
001-41740 |
93-4958665 |

(State
of Incorporation or

Organization) |
(Commission File Number) |
(I.R.S.
Employer Identification

No.) |

221
Crescent Street , Building 17 ,
Suite 102b ,

Waltham ,
MA , 02453

(Address of Principal
Executive Offices, including Zip Code)

( 650 )
394-5230

(Registrant’s telephone
number, including area code)

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 $0.00001 per share |
  |
APGE |
  |
The
Nasdaq Global
Market |

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.

Revenue Participation Right Purchase and Sale Agreement

On
May 26, 2026 (the “Effective Date”), Apogee Therapeutics, Inc. (the “Company”) entered into a revenue participation
right purchase and sale agreement (the “Revenue Share Agreement”) with Annapurna Aggregator L.P., an affiliate of funds managed
by Blackstone Life Sciences (“BXLS”).

Pursuant
to the Revenue Share Agreement, in exchange for an upfront payment of $100.0 million (the “Tranche 1 Funding”), BXLS purchased
from the Company the right to receive tiered revenue share payments (the “Revenue Share Payments”) with respect to annual
worldwide net product sales (“Net Sales”) of the Company’s anti-IL-13 antibody, zumilokibart (APG777) (“zumilokibart”).

In addition, under the Revenue Share Agreement:

(i) BXLS will purchase additional Revenue Share Payments from the Company
in exchange for a payment of $100.0 million (the “Tranche 2 Funding”), upon the occurrence of full enrollment of patients
in both of the Company’s planned registrational monotherapy Phase 3 clinical trials of zumilokibart in patients with atopic dermatitis
(“AD”), coded by the Company as APG777-301 and APG777-302 (the “Zumilokibart Phase 3 Clinical Trials”);

(ii) BXLS will purchase additional Revenue Share Payments from the
Company in exchange for a payment of $200.0 million (the “Tranche 3 Funding”), upon the occurrence of positive data readouts
from the Zumilokibart Phase 3 Clinical Trials meeting agreed upon endpoints with statistical significance; and

(iii) BXLS will purchase additional Revenue Share Payments from the
Company in exchange for a payment (the “Tranche 4 Funding”) of, at the Company’s election, between $250.0 million and
up to $400.0 million (“Tranche 4 Maximum Purchase Price”), upon zumilokibart’s receipt of marketing approval from the
U.S. Food and Drug Administration for the treatment of AD on or prior to December 31, 2030 (the “Tranche 4 Trigger”).

The Revenue Share Payments are based on a tiered percentage of aggregate
annual Net Sales of zumilokibart (“Annual Aggregate Product Net Sales”). Under the Revenue Share Agreement, the revenue percentage
payable to BXLS is the sum of (a) the base revenue percentage (the “Base Revenue Percentage”) and (b) the tranche 4 revenue
percentage (the “Tranche 4 Revenue Percentage” and, together with the Base Revenue Percentage, the “Revenue Percentages”),
which applies only from and after the Tranche 4 Funding.

The table below summarizes the Revenue Percentages payable to BXLS,
based on the tiers of Annual Aggregate Product Net Sales. The Base Revenue Percentage shown reflects the rate applicable after receipt
of the Tranche 1 Funding; this rate would double upon receipt of the Tranche 2 Funding, and double again upon receipt of the Tranche 3
Funding. The Tranche 4 Revenue Percentage is subject to proportional adjustment if the Tranche 4 Funding is less than the Tranche 4 Maximum
Purchase Price:

Annual Aggregate Product Net Sales |   |
Base Revenue

Percentage |   |   |
Tranche 4 Revenue

Percentage |   |   |
Maximum Revenue

Percentage |   |

Up to and including $5 billion (“Tier 1”) |   |
  | 0.9375 | % |   |
  | 2.50 | % |   |
  | 3.4375 | % |

In excess of $5 billion but less than or equal to $8 billion |   |
  | 0.25 | % |   |
  | 0.00 | % |   |
  | 0.25 | % |

The
Tranche 4 Revenue Percentage is subject to a cap of $1.0 billion in aggregate Tranche 4-related Revenue Share Payments to BXLS,
after which the Tranche 4 Revenue Percentage for Tier 1 decreases to 0.00%.

The Revenue Share Payments will be payable during a term commencing
on the date of the first commercial sale of zumilokibart and ending on the fifteenth (15th) anniversary of the date of receipt of marketing
approval for zumilokibart.

If the Company consummates a change of control with a third party,
the Company will be required to pay a certain specified amount to BXLS. Such amount will be credited against future Revenue Share Payments
otherwise payable to BXLS following the consummation of the change of control.

In the alternative, at any time after the Company enters into a definitive
agreement for a change of control, in lieu of the required payment above, the Company will have the option to pay certain specified amounts
to BXLS to buy down a certain percentage of future Revenue Share Payments, if exercised on or prior to the 180-day anniversary of the
Effective Date, or on or prior to December 31, 2030 (each, a “Buy-Back Option”). If the Company exercises a Buy-Back Option,
the Revenue Percentage will be adjusted downward in accordance with the Revenue Share Agreement, and if the Buy-Back Option is exercised
prior to the Tranche 4 Trigger, BXLS will no longer be obligated to pay the Tranche 4 Funding, and in such case the Tranche 4 Revenue
Percentages across all tiers will be 0.00%.

Under the Revenue Share Agreement, for the purposes of providing additional assurance to BXLS, including in the event of a recharacterization, the Company has granted BXLS a backup security interest in, among other things, the revenue participation right, the
Revenue Share Payments, and the Company’s intellectual property and other product rights related to zumilokibart. This backup
security interest will terminate upon the later of (a) a change of control with a permitted transferee and (b) BXLS’s receipt
of the applicable change of control payment.

The Company and BXLS also agree to negotiate in good faith a debt financing
of up to $500.0 million upon mutual agreement of the parties.

The Revenue Share Agreement contains customary representations, warranties
and indemnities of the Company and BXLS, and customary covenants on the part of the Company.

The foregoing description of the Revenue Share Agreement does not purport
to be complete and is qualified in its entirety by reference to the full text of the Revenue Share Agreement, a copy of which will be
filed as an exhibit to the Company’s Quarterly Report on Form 10-Q for the quarter ending June 30, 2026 with the Securities and
Exchange Commission.

Item 7.01 Regulation FD Disclosure.

Press Release

On May 27, 2026, the Company issued a press release announcing the
Revenue Share Agreement.

Supplemental Financial Information

As a result of entering into the transactions described in Item 1.01
of this Current Report on Form 8-K (this “Report”), the Company is removing its cash runway end date guidance.

A copy of the press release is furnished as Exhibit 99.1 to this Report
and is incorporated by reference herein. The information furnished under this Item 7.01, including Exhibit 99.1 to this Report, is furnished
under Item 7.01 of this Report and shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange
Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed
incorporated by reference in any filing under the Exchange Act or the Securities Act of 1933, as amended, regardless of any general incorporation
language in such filing.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.

EXHIBIT INDEX

Exhibit

No.
|
  |
Description |

|
  |

99.1 |
  |
Press
Release, dated May 27, 2026 |

|
  |

104 |
  |
Cover
Page Interactive Data File (embedded within the Inline XBRL document). |

SIGNATURES

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

|
Apogee Therapeutics, Inc. |

|
  |
  |

Date: May 27, 2026 |
By: |
/s/ Michael Henderson, M.D. |

|
  |
Michael Henderson, M.D. |

|
  |
Chief Executive Officer |

### EX-99.1 - EXHIBIT 99.1
EX-99.1
2
tm2615568d2_ex99-1.htm
EXHIBIT 99.1

Exhibit 99.1

Apogee Therapeutics Announces $1.3 Billion
Strategic Financing Collaboration with Blackstone Life Sciences to Advance Phase 3 Development and Commercialization of Zumilokibart

Up to $1.3 billion in flexible, non-dilutive
capital, including up to $800 million of synthetic royalty and access of up to $500 million in senior corporate debt

Combined with company's current total cash
of $1.3 billion, this transaction positions Apogee to achieve a self-sustainable financial profile through commercialization of zumilokibart
without need for future equity financing

Apogee to host webcast with the APEX Phase
2 Part B results today at 8:00 a.m. Eastern Time

San Francisco and Boston, May 27, 2026, (GLOBE
NEWSWIRE) — Apogee Therapeutics, Inc. (Nasdaq: APGE), a clinical-stage biotechnology company advancing optimized, novel biologics
with the potential for best-in-class profiles in the largest inflammatory and immunology (I&I) markets, today announced that it has
entered into a strategic financing collaboration with funds managed by Blackstone Life Sciences (“Blackstone”) for up to
$1.3 billion in flexible, non-dilutive total capital to support the continued development and potential commercialization of zumilokibart.

“Our partnership with Blackstone Life Sciences
represents a major milestone in the advancement of zumilokibart as the next meaningful first line therapy for moderate-to-severe atopic
dermatitis,” said Michael Henderson, M.D., Chief Executive Officer of Apogee Therapeutics. “This collaboration provides non-dilutive
flexible funding at an attractive cost of capital for the late-stage development of zumilokibart and establishes a path to commercialization
and profitability for Apogee. As supported by our Apex Part B data announced today, we believe zumilokibart has the potential to be a
transformative therapy for patients with differentiated efficacy and dosing in atopic dermatitis and other large I&I indications.”

“We are excited to support Apogee's advancement
of zumilokibart through Phase 3 development and potential commercialization,” said Dr. Nicholas Galakatos, Global Head of Blackstone
Life Sciences. “Our collaboration with Apogee is a great example of our strategy to provide leading biotechnology companies with non-dilutive financing at scale and the resources and flexibility to further scientific innovation and invest in the advancement
of their pipelines."

Added Kiran Reddy, M.D., Senior Managing Director, Blackstone Life
Sciences, "This is the largest royalty financing for a pre-Phase 3 program to date. It reflects our conviction that zumilokibart
has the potential to become a highly differentiated, multi-indication product that will have a major impact on patients' quality of life."

Transaction Overview

The collaboration agreement provides for up to
$1.3 billion in flexible, non-dilutive total capital, including up to $800 million of synthetic royalty and up to $500 million of senior
debt available at the mutual consent of Apogee and Blackstone.

Synthetic royalty: Blackstone
will provide up to $800 million of synthetic royalty funding in exchange for low-to-mid single digit tiered royalties for a term of 15
years on worldwide annual sales of zumilokibart. The royalties decrease based on sales with no royalties on global annual sales in excess
of $8 billion.

| · | The
first $400 million in preapproval funding is divided into 3 tranches, including $100 million
at signing, $100 million upon completion of zumilokibart Phase 3 enrollment, and $200 million
upon positive Phase 3 data. Upon FDA approval of zumilokibart, up to $400 million in additional
funding is available, $150 million of which is at Apogee’s option |

| · | The
funding agreement includes specific provisions on a change of control, with the option to
buy back a significant portion of the royalty. |

| · | Senior
debt: Up to $500 million of senior corporate debt is available at mutual consent of Apogee
and Blackstone |

Additional details regarding the funding agreement
can be found in the Current Report on Form 8-K filed by the company today with the U.S. Securities and Exchange Commission.

Cash runway update

As a result of entering into this funding agreement
with Blackstone, the company is removing its cash runway end date guidance.

Webcast Details

Apogee Therapeutics will hold a live webcast
to discuss the Blackstone transaction and the results of the APEX Phase 2 Part B trial today at 8:00 a.m. ET. The live webcast can be
accessed via this link or the Investors section on the company’s website at https://investors.apogeetherapeutics.com/news-events/events .
A replay of the webcast will be available following the call.

Advisors

Goldman Sachs served as exclusive financial
advisor and Latham & Watkins LLP as legal counsel to Apogee Therapeutics. Ropes & Gray LLP served as legal counsel to
Blackstone Life Sciences.

About Apogee

Apogee Therapeutics is a clinical-stage biotechnology
company advancing novel biologics with potential for differentiated efficacy and dosing in the largest I&I markets, including for
the treatment of AD, asthma, eosinophilic esophagitis (EoE), Chronic Obstructive Pulmonary Disease (COPD) and other I&I indications.
Apogee’s antibody programs are designed to overcome limitations of existing therapies by targeting well-established mechanisms
of action and incorporating advanced antibody engineering to optimize half-life and other properties. Zumilokibart, the company’s
most advanced program, is being initially developed for the treatment of AD, which is the largest and one of the least penetrated I&I
markets, as well as asthma and EoE. With four validated targets in its portfolio, Apogee is seeking to achieve best-in-class efficacy
and dosing through monotherapies and combinations of its novel antibodies. Based on a broad pipeline and depth of expertise, the company
believes it can deliver value and meaningful benefit to patients underserved by today’s standard of care. For more information,
please visit https://apogeetherapeutics.com.

About Blackstone Life Sciences

Blackstone Life Sciences (BXLS) is a leading private investment platform
with capabilities to invest across the life cycle of companies and products within the key life science sectors. By combining scale investments
and hands-on operational leadership, BXLS helps bring to market promising new medicines and medical technologies that improve patients’
lives and currently has $17 billion in assets under management.

Forward Looking Statements

Certain statements in this press release may
constitute “forward-looking statements” within the meaning of the federal securities laws, including, but not limited to,
statements regarding Apogee’s expectations regarding: Apogee’s plans for its current and future product candidates, programs,
and clinical trials, including the Phase 3 development and potential commercialization of zumilokibart and expansion of zumilokibart
into additional indications; the potential clinical benefit, dosing regimen, safety and efficacy profiles and treatment outcomes of zumilokibart,
including its potential to be a best-in-class therapy, be the next meaningful first line therapy for AD, overcome limitations of existing
therapies, and be the new standard of care in AD; the potential for Apogee product candidates and programs to overcome limitations of
existing therapies; the potential of zumilokibart to become a differentiated, multi-indication product; its planned business strategies;
the financial resources available to Apogee, including the availability of capital from the synthetic royalty and potential debt arrangement
and whether Apogee achieves the milestones associated with certain payments thereunder and whether Apogee elects to receive optional
funding under the arrangement, if available; its expectations regarding the time period over which Apogee’s capital resources will
be sufficient to fund its anticipated operations, including its self-sustainable financial profile through commercialization of zumilokibart
without the need for future equity financing; its potential profitability; and estimates of market size. Words such as “may,”
“might,” “will,” “objective,” “intend,” “should,” “could,” “can,”
“would,” “expect,” “believe,” “design,” “estimate,” “predict,”
“potential,” “develop,” “plan” or the negative of these terms, and similar expressions, or statements
regarding intent, belief, or current expectations, are forward-looking statements. While Apogee believes these forward-looking statements
are reasonable, undue reliance should not be placed on any such forward-looking statements, which are based on information available
to Apogee on the date of this release. These forward-looking statements are based upon current estimates and assumptions and are subject
to various risks and uncertainties (including, without limitation, those set forth in Apogee’s filings with the U.S. Securities
and Exchange Commission (the SEC)), many of which are beyond Apogee’s control and subject to change. Actual results could be materially
different. Risks and uncertainties include: global macroeconomic conditions and related volatility, expectations regarding the initiation,
progress, and expected results of Apogee’s preclinical studies, clinical trials and research and development programs; expectations
regarding the timing, completion and outcome of Apogee’s clinical trials; the unpredictable relationship between preclinical study
results and clinical study results; the applicability of clinical study results to actual outcomes; the timing or likelihood of regulatory
filings and approvals; liquidity and capital resources; and other risks and uncertainties identified in Apogee’s Annual Report
on Form 10-K for the year ended December 31, 2025, filed with the SEC on March 2, 2026, and subsequent disclosure documents Apogee may
file with the SEC. Apogee claims the protection of the Safe Harbor contained in the Private Securities Litigation Reform Act of 1995
for forward-looking statements. Apogee expressly disclaims any obligation to update or alter any statements whether as a result of new
information, future events or otherwise, except as required by law.

Apogee Investor Contact:

Noel Kurdi

VP, Investor Relations

Apogee Therapeutics, Inc.

Noel.Kurdi@apogeetherapeutics.com

Apogee Media Contact:

Dan Budwick

1AB Media

dan@1abmedia.com

Blackstone Life Sciences Media Contact:

David Vitek

(212) 583-5291

David.Vitek@blackstone.com