Sintx Technologies, Inc.

**Information regarding risk factors appears in Item 1A of our Annual Report on Form 10-K for the year ended December 31, 2025, which was filed with the SEC on March 20, 2026.**The following disclosures supplement the risk factors previously identified in our Annual Report on Form 10-K. Except as discussed below, there have been no material changes to the risk factors previously disclosed.

We derive a substantial portion of our revenue from a limited number of customers, and the loss of or reduction in purchases by one or more of these customers could materially adversely affect our business and financial results.

A substantial portion of our revenue is attributable to a limited number of industrial and OEM customers. For the three and nine months ended September 30, 2026, one customer accounted for approximately 82% and 61% of our total revenue, respectively, and a second customer accounted for approximately 9% and 19% of our total revenue, respectively.

Our revenue from these customers may fluctuate significantly based on the timing, size and frequency of purchase orders, customer production requirements, manufacturing schedules and other factors outside our control. Significant customer orders received or fulfilled in one reporting period may not recur in subsequent periods.

The loss of a significant customer, a reduction or delay in its orders, or our inability to satisfy applicable manufacturing, quality or delivery requirements could result in substantial fluctuations in our revenue, gross profit and cash flows. We cannot assure investors that the increased revenue recognized during the third quarter of 2026 will be sustained in future periods or that we will be able to replace revenue lost from any significant customer.

Our use of accounts receivable factoring arrangements to support working capital may involve additional costs and financial risks and may not provide sufficient liquidity to meet our operating requirements.

We may from time to time sell certain trade accounts receivable to third-party purchasers to accelerate cash collections and support our working capital requirements. In September 2026, we entered into such an arrangement involving a receivable with a face amount of approximately $1.7 million.

These arrangements may involve transaction fees, deferred purchase price payments, contractual adjustments and certain repurchase or other obligations arising from customer disputes or breaches of representations and warranties. Amounts ultimately received may be less than the face amount of the receivables sold.

Our ability to utilize similar arrangements in the future will depend on the availability of eligible receivables, the willingness of third parties to purchase those receivables, and the terms offered. We cannot assure investors that such arrangements will remain available on acceptable terms or provide sufficient liquidity to support our ongoing operations.

Our use of receivables factoring arrangements does not eliminate our need to generate positive operating cash flow or obtain additional financing, and the inability to obtain sufficient working capital could materially adversely affect our business, financial condition and results of operations.