shall be deemed to be furnished, and not filed: Exhibit Number Exhibit Description Exhibit 99.1 Press Release issued by IPG Photonics Corporation on August 4 , 2026. Exhibit 104 Inline XBRL for the cover page of this Current Report on Form 8-K. SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this Current Report on Form 8-K to be signed on its behalf by the undersigned thereunto duly authorized. IPG PHOTONICS CORPORATIO…

Entry in a Material Definitive Agreement. Put Option Agreement, Share Purchase Agreement On July 16, 2026, IPG Photonics Corporation (the “ Company ”) entered into a Put Option Agreement (the “ Put Option Agreement ”), with Lumibird S.A., a French société anonyme (listed on Euronext Paris) (the “ Seller ”), relating to the proposed acquisition by the Company of 100% of the outstanding shares of Lumibird Medical, a French société par actions simplifiée and wholly-owned subsidiary of the Seller…

shall be deemed to be furnished, and not filed: Exhibit Number Exhibit Description Exhibit 99.1 Press Release issued by IPG Photonics Corporation on May 5 , 2026. Exhibit 99.2 Press Release issued by IPG Photonics Corporation on May 5, 2026. Exhibit 104 Inline XBRL for the cover page of this Current Report on Form 8-K. SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this Current Report on Form 8-K to be signed on its b…

Other Events. On May 5, 2026, the Company issued a press release announcing that it has entered into an agreement with Trumpf Laser- und Systemtechnik SE to resolve and dismiss all patent litigation worldwide between the parties. The press release is attached as Exhibit 99.2 to this Current Report on Form 8-K and is incorporated herein by reference.

Other Events. On March 16, 2026, IPG Photonics Corporation (the " Company ") issued a press release announcing that the Local Division of the Unified Patent Court located in Dusseldorf, Germany issued a decision in the previously disclosed patent infringement lawsuit brought by affiliates of Trumpf SE & Co. KG against IPG Laser GmbH & Co. KG, a German subsidiary of the Company. The press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by refer…

shall be deemed to be furnished, and not filed: Exhibit Number Exhibit Description Exhibit 99.1 Press Release issued by IPG Photonics Corporation on February 12 , 2026. Exhibit 104 Inline XBRL for the cover page of this Current Report on Form 8-K. SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this Current Report on Form 8-K to be signed on its behalf by the undersigned thereunto duly authorized. IPG PHOTONICS CORPORA…

shall be deemed to be furnished, and not filed: Exhibit Number Exhibit Description Exhibit 99.1 Press Release issued by IPG Photonics Corporation on November 4 , 2025 . Exhibit 104 Inline XBRL for the cover page of this Current Report on Form 8-K. SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this Current Report on Form 8-K to be signed on its behalf by the undersigned thereunto duly authorized. IPG PHOTONICS CORPORA…

The filing details changes to the company's executive severance plan, which is a routine administrative matter.

shall be deemed to be furnished, and not filed: Exhibit Number Exhibit Description Exhibit 99.1 Press Release issued by IPG Photonics Corporation on August 5 , 2025 . Exhibit 104 Inline XBRL for the cover page of this Current Report on Form 8-K. SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this Current Report on Form 8-K to be signed on its behalf by the undersigned thereunto duly authorized. IPG PHOTONICS CORPORATI…

Senior Vice President, Global Operations — Dr. Paulus Bucher: The filing discloses the appointment of a new Senior Vice President from an external company, which is a significant addition to the management team rather than a departure.

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information set forth under

Entry into a Material Definitive Agreement. On June 24, 2025, IPG Photonics Corporation (the “ Company ”) entered into a credit agreement (the “ Credit Agreement ”) with Bank of America, N.A. (“ Bank of America ”), as administrative agent, the additional subsidiary borrowers from time to time party thereto, and the additional lenders from time to time party thereto, which replaces the Company’s existing Second Amended and Restated Loan Agreement, dated as of March 25, 2020 (as amended, restat…

The filing discloses the adoption of a new incentive compensation plan, which is a routine corporate governance matter rather than a change in management personnel.

shall be deemed to be furnished, and not filed: Exhibit Number Exhibit Description Exhibit 99.1 Press Release issued by IPG Photonics Corporation on May 6 , 2025 . Exhibit 104 Inline XBRL for the cover page of this Current Report on Form 8-K. SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this Current Report on Form 8-K to be signed on its behalf by the undersigned thereunto duly authorized. IPG PHOTONICS CORPORATION…

Chief Technology Officer — Alexander Ovtchinnikov: The filing discloses an amendment to a consulting agreement for a former executive, which is a compensatory arrangement rather than a current management departure or appointment.

Director — Michael C. Child: A board member announced they will not stand for re-election, which is a standard departure of a director without indication of conflict or executive-level shock.

shall be deemed to be furnished, and not filed: Exhibit Number Exhibit Description Exhibit 99.1 Press Release issued by IPG Photonics Corporation on Feb ruary 11, 2025 . Exhibit 104 Inline XBRL for the cover page of this Current Report on Form 8-K. SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this Current Report on Form 8-K to be signed on its behalf by the undersigned thereunto duly authorized. IPG PHOTONICS CORPOR…

Chief Accounting Officer — Thomas J. Burgomaster: The Chief Accounting Officer is retiring with a named internal successor already appointed, representing an orderly succession rather than a sudden loss of leadership.

Other Events. On October 29, 2024, the Company issued a press release announcing it entered into a definitive agreement to acquire Clean-Lasersysteme GmbH, a leader in laser cleaning systems based in Herzogenrath, Germany. The transaction remains subject to the completion of customary conditions, including regulatory approval, and is expected to close during the fourth quarter of 2024. The press release relating to the acquisition of Clean-Lasersysteme GmbH is attached as Exhibit 99.2 to this…

shall be deemed to be furnished, and not filed: Exhibit Number Exhibit Description Exhibit 99.1 Press Release issued by IPG Photonics Corporation on October 29 , 2024 . Exhibit 99.2 Press Release issued by IPG Photonics Corporation on October 29, 2024. Exhibit 104 Inline XBRL for the cover page of this Current Report on Form 8-K. SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this Current Report on Form 8-K to be sign…

CEO — Dr. Mark Gitin: The filing primarily discloses a revision to the annual incentive plan due to macroeconomic conditions, with only incidental mentions of a CEO hire and former officers leaving their roles.

Chief Technology Officer — Alexander Ovtchinnikov: The CTO is retiring but has entered a consulting agreement to remain involved, indicating an orderly transition rather than a sudden loss of leadership.

shall be deemed to be furnished, and not filed: Exhibit Number Exhibit Description Exhibit 99.1 Press Release issued by IPG Photonics Corporation on July 30, 2024 . Exhibit 104 Inline XBRL for the cover page of this Current Report on Form 8-K. SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this Current Report on Form 8-K to be signed on its behalf by the undersigned thereunto duly authorized. IPG PHOTONICS CORPORATION…

CEO — Dr. Eugene Scherbakov: The CEO is transitioning out of the role with a named successor (Dr. Mark Gitin) appointed to take over, indicating an orderly succession rather than a sudden loss of leadership.

of this Current Report on Form 8-K, including Exhibit 99.1 referenced herein, shall not be deemed "filed" for purposes of Section 18 of the Securities 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 by the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing.