CIEN · Ciena Corp

$378.44 -21.41 (-5.35%) At close · Aug 28

S&P 500 member Russell 1000 member Rebalance outlook locked

Market Cap

$53.57B

141.55M

Daily short-sale volume published by FINRA from its trade-reporting facilities. It measures how many shares were sold short each day as a share of total volume — a daily flow, not the total outstanding short position.

1M 3M 6M 1Y 5Y All

Short Volume

Date	Short Volume	Short Exempt	Total Volume	Short %
2026-08-28	212,583	109	578,775	36.7%
2026-08-27	216,987	137	540,291	40.2%
2026-08-26	261,002	168	589,126	44.3%
2026-08-25	188,420	139	484,926	38.9%
2026-08-24	244,100	322	745,035	32.8%
2026-08-21	196,213	17	493,808	39.7%
2026-08-20	199,065	589	607,323	32.8%
2026-08-19	341,731	34,993	732,746	46.6%
2026-08-18	336,315	16,102	1,295,535	26.0%
2026-08-17	370,726	1,133	1,206,550	30.7%
2026-08-14	338,556	34,078	1,231,146	27.5%
2026-08-13	628,698	124	1,425,924	44.1%
2026-08-12	779,824	9,246	2,180,274	35.8%
2026-08-11	210,816	4,924	631,889	33.4%
2026-08-10	356,798	5,632	806,946	44.2%
2026-08-07	377,597	1,113	921,134	41.0%
2026-08-06	179,764	343	505,589	35.6%
2026-08-05	372,953	719	875,280	42.6%
2026-08-04	382,131	8	858,880	44.5%
2026-08-03	235,976	990	581,683	40.6%
2026-07-31	604,058	18	985,200	61.3%
2026-07-30	638,458	2,384	1,050,285	60.8%
2026-07-29	676,052	11,693	1,304,887	51.8%
2026-07-28	677,393	17,940	2,063,079	32.8%
2026-07-27	288,368	380	732,820	39.4%
2026-07-24	511,917	625	740,255	69.2%
2026-07-23	471,513	253	739,481	63.8%
2026-07-22	441,202	57	683,161	64.6%
2026-07-21	550,653	346	909,166	60.6%
2026-07-20	374,417	165	888,572	42.1%
2026-07-17	361,844	8,270	1,289,552	28.1%
2026-07-16	470,285	3,778	1,123,630	41.9%
2026-07-15	331,378	390	719,085	46.1%
2026-07-14	256,080	138	567,055	45.2%
2026-07-13	191,046	44	504,320	37.9%
2026-07-10	247,123	2,320	539,639	45.8%
2026-07-09	480,305	444	911,026	52.7%
2026-07-08	442,991	16	882,277	50.2%
2026-07-07	443,361	1,345	895,057	49.5%
2026-07-06	316,994	20,153	571,679	55.4%
2026-07-02	387,814	1,808	973,033	39.9%
2026-07-01	497,990	2,004	906,280	54.9%
2026-06-30	614,611	340	996,108	61.7%
2026-06-29	674,340	41	1,509,459	44.7%
2026-06-26	816,632	285	1,502,298	54.4%
2026-06-25	868,215	892	1,518,637	57.2%
2026-06-24	566,155	3,158	1,209,115	46.8%
2026-06-23	535,943	585	1,333,535	40.2%
2026-06-22	393,786	505	1,513,189	26.0%
2026-06-18	474,571	392	1,111,714	42.7%

Showing 1–50 of 63 days

Key facts CIK 936395 CUSIP 171779309 13F (30d) 838 filings 815 filers Visit website Investor relations