Recent 8-K filings for IMSR

• May 14, 2026 11:45 UTC earnings materiality 0.75 negative item 2.02item 9.01

  Terrestrial Energy Q1 net loss $10.5M; cash $289.9M; NRC approves PIE Topical Report

  Net loss of $10.5M in Q1 2026 vs $6.2M in Q4 2025, driven by higher R&D and G&A costs.

• May 08, 2026 23:59 UTC leadership materiality 0.25 neutral item 5.02

  Terrestrial Energy discloses Board resignation of David Hill, effective July 1, 2026

  David Hill resigned from the Board of Directors, effective July 1, 2026; joined Board in 2014.

• Apr 16, 2026 23:59 UTC leadership materiality 0.45 neutral item 5.02item 9.01

  Terrestrial Energy enters new employment agreements with CFO, COO, and CTO on April 16, 2026

  CFO Brian Thrasher: base salary $350k, annual bonus target 43% of base, eligible for equity awards under 2025 Plan.

• Mar 30, 2026 23:59 UTC earnings materiality 0.65 neutral item 2.02item 9.01

  Terrestrial Energy reports 2025 net loss of $28M, cash $298M; IMSR project milestones advanced

  Net loss of $28M for full year 2025, up $17M YoY from $11M, driven by higher R&D (+$5M) and G&A (+$10M).

• Jan 29, 2026 23:59 UTC other_material materiality 0.75 positive item 7.01item 9.01

  Terrestrial Energy provides 2025 milestones and 2026 outlook; raised $292M in business combination

  Completed business combination with HCM II, raising ~$292M gross proceeds and listing on Nasdaq under IMSR.

• Nov 24, 2025 23:59 UTC other_material materiality 0.60 neutral item 4.01item 9.01

  Terrestrial Energy replaces Withum with UHY as independent auditor

  Audit committee dismissed WithumSmith+Brown on Nov 21, 2025, effective upon notice Nov 24.

• Nov 14, 2025 23:59 UTC m_and_a materiality 0.80 neutral item 9.01

  Terrestrial Energy Files Amended 8-K Including Financials for Nuclear Tech Merger

  Business combination with HCM II Acquisition Corp. closed Oct 28, 2025; combined company now trades on Nasdaq as IMSR and IMSRW.

• Nov 03, 2025 23:59 UTC m_and_a materiality 0.85 neutral item 1.01item 2.01item 5.02item 3.02item 9.01item 3.03item 5.01item 5.03item 5.05item 5.06

  Terrestrial Energy completes de-SPAC merger; shares start trading Oct 29 on Nasdaq under IMSR

  Business combination closed Oct 28; Legacy Terrestrial Energy becomes wholly owned sub of New Terrestrial Energy.

• Oct 29, 2025 23:59 UTC m_and_a materiality 0.75 neutral item 3.03item 5.03item 8.01item 9.01

  Terrestrial Energy completes de-SPAC merger; trades on Nasdaq as IMSR/IMSRW

  HCM II Acquisition Corp domesticated to Delaware corp Oct 23, 2025; merger with Legacy Terrestrial Energy closed Oct 28.

• Oct 22, 2025 23:59 UTC m_and_a materiality 0.85 positive item 5.07item 7.01item 9.01

  HCM II shareholders approve business combination with Terrestrial Energy; closing Oct 27

  All proposals approved at the Oct 20 extraordinary general meeting; 15.6M votes for the business combination.

• Sep 29, 2025 23:59 UTC other_material materiality 0.75 positive item 8.01item 9.01item 7.01

  HCM II and Terrestrial Energy: SEC declares S-4 effective, shareholder meeting set for Oct 20

  SEC declared effective the Registration Statement on Form S-4 on September 26, 2025 for the business combination.

• Jul 15, 2025 23:59 UTC other_material materiality 0.70 negative item 4.02

  HCM II Acquisition Corp. non-reliance on FY2024, Q1 2025 financials due to related party disclosure error

  Audit committee on July 15, 2025 determined previously issued financial statements should no longer be relied upon.

• Mar 26, 2025 23:59 UTC m_and_a materiality 0.85 neutral item 1.01item 3.02item 7.01item 8.01item 9.01

  HCM II SPAC merges with Terrestrial Energy; $925M enterprise value, $50M PIPE

  Definitive agreement: HCM II merger sub to merge into Terrestrial Energy; target survives; enterprise value $925M.

Materiality & sentiment trend

Max materiality 0.85 · Median 0.75 · Most common event m_and_a

3 positive 2 negative 8 neutral

source · IMSR on sec.gov