Exhibit 4.1



ZQ|CERT#|COY|CLS|RGSTRY|ACCT#|TRANSTYPE|RUN#|TRANS#   . COMMON STOCK PAR VALUE $0.01 COMMON STOCK Certificate Number ZQ00000000   Shares * * 000000 * * * * * * * * * * * * * * * * * * * * * 000000 * * * * *   * * * * * * * * * * * * * * * * 000000 * * * * * * * * * * * * * * * * * * *   * * 000000 * * * * * * * * * * * * * * * * * * * * * 000000 * * * * * * * * *   * * * * * WILLIAMS INDUSTRIAL SERVICES GROUP INC. INCORPORATED UNDER THE LAWS   OF THE STATE OF DELAWARE ** Mr. Alexander David Sample **** Mr. Alexander   David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample   **** Mr. Alexander David Sample SEE REVERSE FOR CERTAIN DEFINITIONS **** Mr.   Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander   David Sample **** Mr. Alexander David Sample **** Mr. Alexander David THIS   CERTIFIES THAT Sample **** Mr. Alexander David Sample **** Mr. Alexander   David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample   **** Mr. Alexander Alexander David SamMple ***R* Mr.   A.lexaSnderADavidMSampPle ***L* MrE. Alexan&der DavMid SamRple **S** Mr..   AleSxandeAr DaMvid SamPple *L*** MEr. Alex&ander David Sample **** David   Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample ****   Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Mr.   Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander   David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample   **** Mr. Alexander DavidMSampRle ****.Mr. SAlexaAnderMDavidPSamLple *E*** Mr.   &AlexandMer DavRid SaSmple.**** SMr. AAlexanMder DaPvid SLampEle **** Mr.   Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander   David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample   **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr.   Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander   David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample   **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr.   Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander   David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample   **** Mr. Sample **** Mr. Sample is the owner of **000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares***   *000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****   000000**Shar*es****0*000Z00**SEhareRs****00O0000** ShHares**U**0000N00**SDhares*R***000E000**DShares**T**000H000**SOhares*U***000S000**AShareNs****00D0000**Shares****0   THIS CERTIFICATE IS TRANSFERABLE IN CITIES DESIGNATED BY THE TRANSFER AGENT,   AVAILABLE ONLINE AT www.computershare.com   00000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****00   0000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000   000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****0000   0**Shares****00Z0000E**ShaRres****O000000**HSharesU****00N0000**DShareRs****00E0000D**SharesA****00N0000*D*Shares**Z**000E000**RShareOs****00*000*0***Shares****000000   00**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****00000   **Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000*   *Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**   Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**S   FULLY-PAID AND NON-ASSESSABLE SHARES OF THE COMMON STOCK OF Williams   Industrial Services Group Inc., transferable on the books of the Company by   the holder hereof in person or by duly authorized attorney, upon surrender of   this Certificate properly endorsed. This Certificate is not valid until   countersigned by the Transfer Agent and registered by the Registrar. Witness   the facsimile corporate seal and the facsimile signatures of its duly   authorized officers. DATED DD-MMM-YYYY President & Chief Executive   Officer COUNTERSIGNED AND REGISTERED: COMPUTERSHARE TRUST COMPANY, N.A.   TRANSFER AGENT AND REGISTRAR, 1998 Vice President, Administration, General   Counsel & Secretary By AUTHORIZED SIGNATURE CUSIP Holder ID Insurance   Value Number of Shares DTC Certificate Numbers 1234567890/1234567890   1234567890/1234567890 1234567890/1234567890 1234567890/1234567890   1234567890/1234567890 1234567890/1234567890 Total Transaction XXXXXX XX X   XXXXXXXXXX 1,000,000.00 123456 12345678 123456789012345 PO BOX 43004,   Providence, RI 02940-3004 Num/No. Denom. Total 1 2 3 4 5 6 7 1 2 3 4 5 6 1 2   3 4 5 6 MR A SAMPLE DESIGNATION (IF ANY) ADD 1 ADD 2 ADD 3 ADD 4 CUSIP 96951A   10 4 


    




 









 



. WILLIAMS   INDUSTRIAL SERVICES GROUP INC. (Cust) (Minor) (State) and not as tenants in   common (Cust) (Minor) THE COMPANY WILL FURNISH WITHOUT CHARGE TO EACH   STOCKHOLDER WHO SO REQUESTS THE POWERS, DESIGNATIONS, PREFERENCES AND   RELATIVE, PARTICIPATING, OPTIONAL OR OTHER SPECIAL RIGHTS OF EACH CLASS OF   STOCK OR SERIES THEREOF OF THE COMPANY, AND THE QUALIFICATIONS, LIMITATIONS   OR RESTRICTIONS OF SUCH PREFERENCES AND RIGHTS. PLEASE INSERT SOCIAL SECURITY   OR OTHER IDENTIFYING NUMBER OF ASSIGNEE For value received, hereby sell,   assign and transfer unto (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS,   INCLUDING POSTAL ZIP CODE, OF ASSIGNEE) Shares of the common stock   represented by the within Certificate, and do hereby irrevocably constitute   and appoint Attorney to transfer the said stock on the books of the   within-named Corporation with full power of substitution in the premises.   Dated: 20 Signature: Signature: Notice: The signature to this assignment must   correspond with the name as written upon the face of the certificate, in   every particular, without alteration or enlargement, or any change whatever.   The IRS requires that the named transfer agent (“we”) report the cost basis   of certain shares or units acquired after January 1, 2011. If your shares or   units are covered by the legislation, and you requested to sell or transfer   the shares or units using a specific cost basis calculation method, then we   have processed as you requested. If you did not specify a cost basis   calculation method, then we have defaulted to the first in, first out (FIFO)   method. Please consult your tax advisor if you need additional information   about cost basis. If you do not keep in contact with the issuer or do not   have any activity in your account for the time period specified by state law,   your property may become subject to state unclaimed property laws and   transferred to the appropriate state. Signature(s) Guaranteed: Medallion   Guarantee Stamp THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE   GUARANTOR INSTITUTION (Banks, Stockbrokers, Savings and Loan Associations and   Credit Unions) WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION   PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15. The following abbreviations, when   used in the inscription on the face of this certificate, shall be construed   as though they were written out in full according to applicable laws or   regulations: TEN COM - as tenants in commonUNIF GIFT MIN ACT-. . . . . . . .   . .Custodian . . . . . . . . . . . . . . . TEN ENT - as tenants by the   entiretiesunder Uniform Gifts to Minors Act . . . . . . . . . . . . . JT   TEN-as joint tenants with right of survivorshipUNIF TRF MIN ACT . . . . . . .   . . . . . . . .Custodian (until age. . . ). . . . . . . . . . . under Uniform   Transfers to Minors Act. . . . . . . . . . (State) Additional abbreviations   may also be used though not in the above list.