RBCN Rubicon Technology Inc

The class of equity securities to which this statement on Schedule 13D relates is the Common Stock of Rubicon Technology, Inc. ("Issuer"), a Delaware corporation with principal offices located at 900 East Green Street Bensenville, Illinois 60106.

Item 3 is hereby amended and restated to read as follows:

The Shares reported herein as beneficially owned by the Reporting Persons were purchased in the open market and paid for using partnership funds. No borrowed funds were used to purchase the Shares. The aggregate purchase price of the Shares reported herein is approximately $637,843.92, including brokerage commissions.

Item 4 is hereby amended to add the following:

The Reporting Persons participated in the Tender Offer filed by Janel Corporation on July 13, 2022 at a price of $20.00 per share. The final proration of the factor for the tender offer was 50.31%. In connection with the Tender Offer, the Reporting Persons tendered 78,362 Shares in accordance with the terms of the Tender Offer. The Reporting Persons have been shareholders since March 2017 and believe their background and experience, in both operational management and execution, as well as valuation analysis, will support the Issuer and stakeholders in their long-term objectives.

Item 5 is hereby amended and restated to read as follows:

(a) The aggregate number of Securities to which this Schedule 13D relates is 77,658 shares, representing 3.15% of the 2,462,889 shares outstanding as of August 3, 2022, which is the total number of Shares outstanding as reported in the Issuer’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on August 12, 2022.

(b) Each of the Reporting Persons has the sole power to vote or direct the vote and sole power to dispose or to direct the disposition of the Securities reported for it, either for its own benefit or for the benefit of its investment clients or its partners, as the case may be.

(c) There were no transactions in the securities of the Issuer by the Reporting Persons during the past sixty days except as set forth in Item 4.

(d) The investment advisory clients of, or partnerships managed by, SENTENTIA have the sole right to receive and, subject to the notice, withdrawal and/or termination provisions of such advisory contracts and partnership arrangements, the sole power to direct the receipt of dividends from, and the proceeds of sale of, any of the Securities beneficially owned by such Reporting Persons on behalf of such clients or partnerships. Except as noted, no such client or partnership has an interest by virtue of such relationship that relates to more than 5% of the Securities.

(e) On August 15, 2022, the Reporting Persons ceased to beneficially own more than 5% of the outstanding Shares of the Issuer.

Signature

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Dated: August 22, 2022

The original statement shall be signed by each person on whose behalf the statement is filed or his authorized representative. If the statement is signed on behalf of a person by his authorized representative (other than an executive officer or general partner of this filing person), evidence of the representative’s authority to sign on behalf of such person shall be filed with the statement, provided, however, that a power of attorney for this purpose which is already on file with the Commission may be incorporated by reference. The name and any title of each person who signs the statement shall be typed or printed beneath his signature.

Attention: Intentional misstatements or omissions of fact constitute Federal criminal violations (See 18 U.S.C. 1001).