| 421 |  OBAMS | OBA MAKARNACILIK | ₺9,00 | −18,70% | 18:09:19 |
| 422 |  OBASE | OBASE BILGISAYAR | ₺41,62 | −3,19% | 18:09:59 |
| 423 |  ODAS | ODAS ELEKTRIK | ₺6,19 | −959,72% | 18:09:20 |
| 424 |  ODINE | ODINE TEKNOLOJI | ₺349,75 | +0,76% | 18:05:13 |
| 425 |  OFSYM | OFIS YEM GIDA | ₺71,05 | −0,78% | 18:09:10 |
| 426 |  ONCSM | ONCOSEM ONKOLOJIK SISTEMLER | ₺300,00 | −0,83% | 18:09:02 |
| 427 |  ONRYT | ONUR TEKNOLOJI | ₺72,00 | −1,04% | 18:08:59 |
| 428 |  OPK30 | OSMANLI PORTFOY KATILIM 30 ENDEKS HSY BYF | ₺60,66 | +0,71% | 18:05:15 |
| 429 |  OPT25 | OSMANLI PORTFOY BIST TEMETTU 25 ENDEKS HSY BYF | ₺52,24 | +5,22% | 18:05:15 |
| 430 |  OPTGY | OSMANLI PORTFOY KAR PAYI ODEYEN BIST GYO HSY BYF | ₺163,65 | +0,49% | 18:05:15 |
| 431 |  OPTLR | OSMANLI P BIST TLREF(TL) END BYF | ₺51,34 | +0,69% | 18:08:01 |
| 432 |  OPX30 | OSMANLI PORTFOY BIST 30 HSY BYF | ₺81,38 | +3,95% | 18:05:15 |
| 433 |  ORCAY | ORCAY ORTAKOY CAY SANAYI | ₺3,74 | −22,08% | 17:39:36 |
| 434 |  ORGE | ORGE ENERJI ELEKTRIK | ₺72,85 | +2,97% | 18:08:49 |
| 435 |  ORMA | ORMA ORMAN MAHSULLERI | ₺163,90 | +0,34% | 09:55:07 |
| 436 |  OSMEN | OSMANLI MENKUL | ₺8,35 | −12,38% | 18:05:13 |
| 437 |  OSTIM | OSTIM ENDUSTRIYEL YAT | ₺2,98 | +29,57% | 18:05:13 |
| 438 |  OTKAR | OTOKAR | ₺431,50 | −0,30% | 18:09:38 |
| 439 |  OTTO | OTTO HOLDING | ₺324,00 | +0,61% | 18:05:13 |
| 440 |  OYAKC | OYAK CIMENTO | ₺27,40 | +2,20% | 18:09:36 |
| 441 |  OYAYO | OYAK YAT. ORT. | ₺53,30 | +1,08% | 17:50:35 |
| 442 |  OYLUM | OYLUM SINAI YATIRIMLAR | ₺8,47 | −14,18% | 17:58:27 |
| 443 |  OYYAT | OYAK YATIRIM MENKUL | ₺46,40 | +0,85% | 18:05:13 |
| 444 |  OZATD | OZATA DENIZCILIK | ₺161,90 | +1,88% | 18:08:06 |
| 445 |  OZGYO | OZDERICI GMYO | ₺2,08 | +0,00% | 18:05:13 |
| 446 |  OZKGY | OZAK GMYO | ₺15,29 | +12,76% | 18:05:13 |
| 447 | OZKGY | OZAK GMYO | ₺15,29 | +12,76% | 18:05:13 |
| 448 |  OZRDN | OZERDEN AMBALAJ | ₺16,12 | −11,38% | 18:09:26 |
| 449 |  OZSUB | OZSU BALIK | ₺20,06 | −8,90% | 18:05:13 |
| 450 |  OZYSR | OZYASAR TEL | ₺42,60 | −10,33% | 18:08:01 |
