http://archive.fast-edgar.com/20260901/A8Z28Q2CZZ228ZQ2229Q2ZZ288E9K72SU282
Filed on: September 1, 2026
http://archive.fast-edgar.com/20260901/A72JK22CZ222A2Z2222L2C4ZSEQTZK628282
Filed on: September 1, 2026
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 8-K
CURRENT REPORT
Pursuant to Section 13 or 15(d)
of the Securities Exchange Act of 1934
Date of report (date of earliest event reported): September 1, 2026
UPSTREAM BIO, INC.
(Exact name of registrant as specified in its charter)
Delaware
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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 6-K
REPORT OF FOREIGN PRIVATE ISSUER
PURSUANT TO RULE 13a-16 OR 15d-16
UNDER THE SECURITIES EXCHANGE ACT OF 1934
For the month of September 2026
Commission File Number: 001-15092
TURKCELL İLETİŞİM HİZMETLERİ A.Ş.
(Translation of registrant’s name into English)
Turkcell Küçükyalı Plaza
Aydınevler Mahallesi, İsmet İnönü Caddesi, No:20
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