Sec Form 4 Filing - Ortelius Advisors, L.P. @ TRECORA RESOURCES - 2021-06-24

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Ortelius Advisors, L.P. 2. Issuer Name and Ticker or Trading Symbol TRECORA RESOURCES [ TREC] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 450 PARK AVENUE, SUITE 2700, 3. Date of Earliest Transaction (MM/DD/YY) 06/24/2021 (Street) NEW YORK, NY10022 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 06/24/2021 P 28,076 A $ 8.18 ( 1 ) 2,551,497 I See footnotes ( 2 ) ( 3 ) Common Stock 06/25/2021 P 58,449 A $ 8.31 ( 4 ) 2,609,946 I See footnotes ( 3 ) ( 5 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Ortelius Advisors, L.P. 450 PARK AVENUE, SUITE 2700 NEW YORK, NY10022 X Pangaea Ventures, L.P. C/O ORTELIUS ADVISORS, L.P. 450 PARK AVENUE, SUITE 2700 NEW YORK, NY10022 X Temnein Ventures III, L.P. C/O ORTELIUS ADVISORS, L.P. 450 PARK AVENUE, SUITE 2700 NEW YORK, NY10022 X Desorcy Peter 450 PARK AVENUE, SUITE 2700 NEW YORK, NY10022 X Signatures ORTELIUS ADVISORS, L.P. By: Ortelius Management, LLC, its general partner By: /s/ Peter DeSorcy Name: Peter DeSorcy Title: Managing Member 06/28/2021 Signature of Reporting Person Date PANGAEA VENTURES, L.P. By: Ortelius Advisors GP I, LLC, its general partner By: /s/ Peter DeSorcy Name: Peter DeSorcy Title: Managing Member 06/28/2021 Signature of Reporting Person Date TEMNEIN VENTURES III, L.P. By: Temnein Advisors GP III, LLC, its general partner By: /s/ Peter DeSorcy Name: Peter DeSorcy Title: Managing Member 06/28/2021 Signature of Reporting Person Date /s/ Peter DeSorcy 06/28/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The price reported in Column 4 is a weighted average price. The shares were purchased in multiple transactions at prices ranging from $8.08 to $8.30, inclusive. The reporting person undertakes to provide upon request to the issuer, the Securities and Exchange Commission or any security holder of the issuer full information regarding the number of shares purchased at each separate price within the range set forth in this footnote (1). ( 2 )These shares include 2,328,024 shares held by Pangaea Ventures, L.P. ("Pangaea") and 223,473 shares held by Temnein Ventures III, L.P. ("Temnein"). ( 3 )Ortelius Advisors, L.P. (the "Adviser") is the investment manager of Pangaea and Temnein. Peter DeSorcy is the sole member of the general partner of the Adviser, and Mr. DeSorcy has a controlling interest in the Adviser. The Adviser and Mr. DeSorcy disclaim beneficial ownership of any of the shares of common stock owned by Pangaea and Temnein, except to the extent of their pecuniary interest therein. ( 4 )The price reported in Column 4 is a weighted average price. The shares were purchased in multiple transactions at prices ranging from $8.25 to $8.35, inclusive. The reporting person undertakes to provide upon request to the issuer, the Securities and Exchange Commission or any security holder of the issuer full information regarding the number of shares purchased at each separate price within the range set forth in this footnote (4). ( 5 )These shares include 2,328,024 shares held by Pangaea and 281,922 shares held by Temnein.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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