This work presents four high-amplitude variable YSOs (≃3 mag at near- or mid-IR wavelengths) arising from the SPICY catalog. Three outbursts show a duration that is longer than 1 year, and are still ongoing. And additional YSO brightened over the last two epochs of NEOWISE observations and the duration of the outburst is thus unclear. Analysis of the spectra of the four sources confirms them as new members of the eruptive variable class. We find two YSOs that can be firmly classified as bona fide FUors and one object that falls in the V1647 Ori-like class. Given the uncertainty in the duration of its outburst, an additional YSO can only be classified as a candidate FUor. Continued monitoring and follow-up of these particular sources is important to better understand the accretion process of YSOs.

Introduction
Observations
    Photometry
    Spectroscopy
New Eruptive YSOs
Discussion
Summary
Acknowledgments
High-Amplitude YSOs

• Carlos Contreras Peña(Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea, Research Institute of Basic Sciences, Seoul National University, Seoul 08826, Republic of Korea) Corresponding author
• Mizna Ashraf(Indian Institute of Science Education and Research (IISER) Tirupati, Tirupati 517 507, India)
• Jeong-Eun Lee(Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea, SNU Astronomy Research Center, Seoul National University, Seoul 08826, Republic of Korea)
• Gregory Herczeg(Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, People’s Republic of China, Department of Astronomy, Peking University, Beijing 100871, People’s Republic of China)
• Phil Lucas(Centre for Astrophysics Research, University of Hertfordshire, Hatfield, AL10 9AB, UK)
• Zhen Guo(Centre for Astrophysics Research, University of Hertfordshire, Hatfield, AL10 9AB, UK, Instituto de Física y Astronomía, Universidad de Valparaíso, Casilla 5030, Valparaíso, Chile, Núcleo Milenio de Formación Planetaria (NPF), Casilla 5030, Valparaíso, Chile, Departamento de Física, Universidad Tecnicá Federico Santa María, Avenida España 1680, Valparaíso, Chile)
• Doug Johnstone(NRC Herzberg Astronomy and Astrophysics, Victoria, BC, V9E 2E7, Canada, Department of Physics and Astronomy, University of Victoria, Victoria, BC, V8P 5C2, Canada)
• Ho-Gyu Lee(Korea Astronomy and Space Science Institute, Daejeon 34055, Republic of Korea)
• Jessy Jose(Indian Institute of Science Education and Research (IISER) Tirupati, Tirupati 517 507, India)