# EDGAR Filing Document

**Accession Number:** 0001421876
**File Stem:** 0001171843-26-004364
**Filing Date:** 2026-6
**Character Count:** 7531
**Document Hash:** 48e2193b4354062733b6b33e06442105
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001171843-26-004364.hdr.sgml**: 20260630

**ACCESSION NUMBER**: 0001171843-26-004364

**CONFORMED SUBMISSION TYPE**: 6-K

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20260629

**FILED AS OF DATE**: 20260630

**DATE AS OF CHANGE**: 20260629

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Lakefront Biotherapeutics NV
- **CENTRAL INDEX KEY:** 0001421876
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 000000000
- **STATE OF INCORPORATION:** C9

**FILING VALUES:**
- **FORM TYPE:** 6-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-37384
- **FILM NUMBER:** 261137354

**BUSINESS ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** SCHALIENHOEVEDREEF 20T
- **CITY:** 2800 MECHELEN
- **PROVINCE COUNTRY:** C9
- **BUSINESS PHONE:** 3215342900

**MAIL ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** SCHALIENHOEVEDREEF 20T
- **CITY:** 2800 MECHELEN
- **PROVINCE COUNTRY:** C9

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** GALAPAGOS NV
- **DATE OF NAME CHANGE:** 20071220

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

**Form 6-K**

**REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934**

**For the month of June 2026**

Commission File Number: **001-37384**

**Lakefront Biotherapeutics**

(Translation of registrant's name into English)

**Schaliënhoevedreef 20T, 2800 Mechelen, Belgium**

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F [ X ] &nbsp;&nbsp;&nbsp;&nbsp; Form 40-F [ ]

The information contained in this Report on Form 6-K, including Exhibit 99.1, is hereby incorporated by reference into the Company's Registration Statements on Form S-8 (File Nos. 333-204567, 333-208697, 333-211834, 333-215783, 333- 218160, 333-225263, 333-231765, 333-249416, 333-260500, 333-268756, 333-275886, 333-283361, and 333-292050).

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On June 29, 2026, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

[Exhibit 99.1. Press release dated June 29, 2026](exh_991.htm)

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**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, thereunto duly authorized.

---

| | |
|:---|:---|
|  | <u>**&nbsp;&nbsp;&nbsp;&nbsp;Lakefront Biotherapeutics&nbsp;&nbsp;&nbsp;&nbsp;**</u> |
|  | (Registrant) |
| Date: June 30, 2026 | <u>&nbsp;&nbsp;&nbsp;&nbsp;/s/ Ying Deng&nbsp;&nbsp;&nbsp;&nbsp;</u> |
|  | Ying Deng |
|  | Authorized Officer |

---

## Exhibit 99.1

**EXHIBIT 99.1**

**Lakefront Receives Transparency Notification from Madison Avenue Partners**

**Mechelen, Belgium; June 29, 2026, 22.01 CET; regulated information – Lakefront Biotherapeutics NV (Euronext & NASDAQ: LKFT) received a transparency notification from Madison Avenue Partners.**

Pursuant to Belgian transparency legislation<sup>1</sup>, Lakefront received a transparency notification from Madison Avenue Partners on June 24, 2026. The notification indicates that Madison Avenue Partners, LP, jointly with Madison Avenue International, LP, EMAI Management, LLC, and Eli Samaha, crossed above the threshold of 5% of Lakefront' voting rights on an aggregated basis on June 15, 2026, following the acquisition of Lakefront' voting rights.

On June 24, 2026, Madison Avenue Partners (taking into account the holding of its affiliates) owned 3,498,892 voting rights, representing 5.31% of Lakefront' currently outstanding 65,897,071 shares.

**Summary of the transaction:**

---

| | | | | |
|:---|:---|:---|:---|:---|
| **Date on which the threshold was crossed** | **Date of notification** | **Direct voting rights after the transaction** | **Equivalent financial instruments after the transaction** | **Total (%)**<br>**voting rights** |
| June 15, 2026 | June 24, 2026 | 3498892 | 0.00% | 5.31% |

---

**Content of the notification from Madison Avenue Partners:**

The notification dated June 24, 2026, contains the following information:

· &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Date of notification: June 24, 2026

· &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Date on which the threshold is crossed: June 15, 2026

· &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Threshold of voting rights crossed (in %): 5%

· &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Notification by: Madison Avenue Partners

· &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Denominator: 65,897,071

· &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Reason for the notification: Acquisition or disposal of voting securities or voting rights

· &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Notified details:

---

| | | | | | |
|:---|:---|:---|:---|:---|:---|
| **A) Voting Rights** | **Previous notification** | **After the transaction** | **After the transaction** | **After the transaction** | **After the transaction** |
| | **# of voting rights** | **# of voting rights** | **# of voting rights** | **% of voting rights** | **% of voting rights** |
| Holder of voting rights |  | Linked to securities | Not linked to securities | Linked to securities | Not linked to securities |
| Madison Avenue Partners, LP | 0 | 3498892 |  | 5.31% |  |

---

---

| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
| **B) Equivalent financial instruments** | **After the transaction** | **After the transaction** | **After the transaction** | **After the transaction** | **After the transaction** | **After the transaction** |
| **Holder of equivalent financial instruments** | **Type of financial instrument** | **Expiration date** | **Exercise period or date** | **# of voting rights that may be acquired if the instrument is exercised** | **% of voting rights** | **Settlement** |
|  | **TOTAL** |  |  | **0** | **0.00%** |  |

---

---

| | | |
|:---|:---|:---|
| **TOTAL (A&B)** | **# of voting rights** | **% of voting rights** |
|  | 3498892 | **5.31%** |

---

The chain of control has been described at the end of the notification (section 11) and can be found <u>here</u>.

**About Lakefront<sup>®</sup>** **Biotherapeutics**

Lakefront Biotherapeutics (formerly known as Galapagos) is a biotechnology company dedicated to building a differentiated pipeline of medicines for patients with serious diseases in areas of high unmet need. The Company has established a clinical-stage portfolio in immunology and inflammation, anchored by gamgertamig, a potential first-in-class BCMAxCD3 T-cell engager for autoimmune diseases. Backed by deep deal-making expertise, operational flexibility, and a strong capital position, Lakefront identifies, acquires, and advances high-quality assets with clear potential to deliver meaningful patient impact and long-term shareholder value. For more information, visit https://www.lakefrontbio.com or follow us on LinkedIn or X.

**For further information, contact Lakefront Biotherapeutics:**

**Investor Relations** 

Sherri Spear

+1 412 522 6418

sherri.spear@lakefrontbio.com

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<sup>1</sup> Belgian Act of 2 May 2007 on the disclosure of major shareholdings in issuers whose shares are admitted to trading on a regulated market and regarding miscellaneous provisions, as amended from time to time.