SideChannel (SDCH) Proxy Filing summary

Executive summary

• Supplement updates the proxy statement for the 2026 Annual Meeting, reflecting a 1-for-52 reverse stock split effective January 22, 2026, and withdrawal of a related proposal.

• All share and per share amounts in the proxy materials have been adjusted to reflect the reverse split.

• The reverse split did not affect voting rights, number of votes, or tabulation methods.

• Forward-looking statements caution about risks and uncertainties affecting future performance.

Voting matters and shareholder proposals

• Proposal to amend the Certificate of Incorporation for a reverse stock split was withdrawn after the split was effectuated.

• All other proposals in the proxy statement remain on the agenda for the 2026 Annual Meeting.

• Votes cast prior to the reverse split remain valid.

Board of directors and corporate governance

• Record date for voting was December 19, 2025, with 4,446,713 shares outstanding post-split.

• Quorum for the meeting is 2,223,357 shares represented in person or by proxy post-split.

• Director compensation for 2025 included cash and RSUs, with vesting over three years.