Exhibit 99.1 PREFORMED LINE PRODUCTS ANNOUNCES FIRST QUARTER 2026 FINANCIAL RESULTS CLEVELAND, OHIO – April 29, 2026 - Preformed Line Products Company (NASDAQ: PLPC) today reported financial results for its first quarter of 2026. Q1 2026 highlights: Net sales in the first quarter of 2026 were $176.3 million compared to $148.5 million in the first quarter of 2025, a 19% increase. All segments recorded sales growth compared to the first quarter of 2025, with the PLP-USA business growing by 26%, primarily due ...