Renaissance Technologies (RenTech)'s CIEN Position Overview
Renaissance Technologies (RenTech) (via Renaissance Technologies LLC (Rentech)) currently holds 32,600 shares of Ciena Corporation (CIEN) worth $7.62 M, representing 0.01% of the portfolio. First purchased in 2013-Q2, this long-term strategic position has been held for 34 quarters.
Based on 13F filings, Renaissance Technologies (RenTech) has maintained a strategic position in CIEN, demonstrating sustained confidence in this investment. Largest addition occurred in Q4 2016, adding 2.17 M shares. Largest reduction occurred in Q2 2017, reducing 1.85 M shares.
Analysis based on 13F filings available since 2013 Q2
Renaissance Technologies (RenTech)'s Ciena Corporation (CIEN) Holding Value Over Time
Track share changes against reported price movement
Quarterly Ciena Corporation (CIEN) Trades by Renaissance Technologies (RenTech)
| Report Date | Bought/Sold (Sh.) | % Change | Qtr. End Shares | Reported Price |
|---|---|---|---|---|
| Q4 2025 | +32,600 | New Buy | 32,600 | $233.87 |
| Q2 2025 | -309,174 | Sold Out | 0 | $0.00 |
| Q1 2025 | +309,174 | New Buy | 309,174 | $60.43 |
| Q1 2024 | -134,674 | Sold Out | 0 | $0.00 |
| Q4 2023 | +134,674 | New Buy | 134,674 | $45.01 |
| Q2 2022 | -37,974 | Sold Out | 0 | $0.00 |
| Q1 2022 | -173,000 | Reduce 82.00% | 37,974 | $60.62 |
| Q4 2021 | +210,974 | New Buy | 210,974 | $76.97 |
| Q2 2020 | -283,974 | Sold Out | 0 | $0.00 |
| Q1 2020 | -898,100 | Reduce 75.98% | 283,974 | $39.81 |
| Q4 2019 | +383,300 | Add 47.99% | 1.18 M | $42.69 |
| Q3 2019 | +408,700 | Add 104.77% | 798,774 | $39.23 |
| Q2 2019 | -1.21 M | Reduce 75.59% | 390,074 | $41.13 |
| Q1 2019 | +1.32 M | Add 471.07% | 1.6 M | $37.34 |
| Q4 2018 | -952,321 | Reduce 77.29% | 279,874 | $33.91 |
| Q3 2018 | +1.02 M | Add 493.90% | 1.23 M | $31.24 |
| Q2 2018 | -1.25 M | Reduce 85.81% | 207,474 | $26.51 |
| Q1 2018 | -454,300 | Reduce 23.71% | 1.46 M | $25.90 |
| Q4 2017 | +1.92 M | New Buy | 1.92 M | $20.93 |
| Q3 2017 | -688,474 | Sold Out | 0 | $0.00 |
| Q2 2017 | -1.85 M | Reduce 72.88% | 688,474 | $25.02 |
| Q1 2017 | -1.49 M | Reduce 37.03% | 2.54 M | $23.61 |
| Q4 2016 | +2.17 M | Add 116.24% | 4.03 M | $24.41 |
| Q3 2016 | -12,000 | Reduce 0.64% | 1.86 M | $21.80 |
| Q2 2016 | -66,474 | Reduce 3.42% | 1.88 M | $18.75 |
| Q1 2016 | -55,200 | Reduce 2.76% | 1.94 M | $19.02 |
| Q4 2015 | +1.77 M | Add 780.79% | 2 M | $20.69 |
| Q3 2015 | -136,421 | Reduce 37.55% | 226,884 | $20.72 |
| Q2 2015 | +315,105 | Add 653.74% | 363,305 | $23.68 |
| Q1 2015 | +30,695 | Add 175.35% | 48,200 | $19.32 |
| Q4 2014 | +17,505 | New Buy | 17,505 | $19.42 |
| Q4 2013 | -1.67 M | Sold Out | 0 | $0.00 |
| Q3 2013 | +537,100 | Add 47.47% | 1.67 M | $25.01 |
| Q2 2013 | +1.13 M | Add 0.00% | 1.13 M | $19.43 |
Renaissance Technologies (RenTech)'s Ciena Corporation Investment FAQs
Renaissance Technologies (RenTech) first purchased Ciena Corporation (CIEN) in Q2 2013, acquiring 1,131,405 shares, as reported in their 13F filing for that period. Note: Analysis reflects filings available since Q2 2013; earlier records may be incomplete.
Renaissance Technologies (RenTech) has held Ciena Corporation (CIEN) for 34 quarters since Q2 2013.
Renaissance Technologies (RenTech)'s largest addition to Ciena Corporation (CIEN) was in Q4 2016, adding 4,032,274 shares worth $98.43 M.
According to the latest 13F filing for Q4 2025, Renaissance Technologies (RenTech)'s firm, Renaissance Technologies LLC (Rentech), owns 32,600 shares of Ciena Corporation (CIEN), valued at approximately $7.62 M.
As of the Q4 2025 filing, Ciena Corporation (CIEN) represents approximately 0.01% of Renaissance Technologies (RenTech)'s publicly disclosed stock portfolio, making it one of their key holdings.
Renaissance Technologies (RenTech)'s peak holding in Ciena Corporation (CIEN) was 4,032,274 shares, as reported at the end of Q4 2016.