Ticker · held by 4 filers

CIEN

CIENA CORP

All tracked filers currently holding CIEN, ranked by position size. Each row links through to the filer's full portfolio.

Total value held

$1.11B

Total shares

17,161,160

Filers holding

4 · 6 positions

Caveat

long only · 13F-eligible managers only

Filers holding CIEN

sorted by position size · click any filer to see their full portfolio

# Filer Class Shares Value (USD) % of port

1 BlackRock · Larry Fink COM NEW 15,609,770 $752.1M 0.02%

2 Citadel Advisors · Ken Griffin COM NEW 719,747 $168.3M 0.03%

3 Citadel Advisors · Ken Griffin CALLCOM NEW 313,600 $73.3M 0.01%

4 Citadel Advisors · Ken Griffin PUTCOM NEW 272,800 $63.8M 0.01%

5 Bridgewater Associates · Ray Dalio (founder) COM NEW 212,643 $49.7M 0.18%

6 Renaissance Technologies · Jim Simons (founder) COM NEW 32,600 $7.6M 0.01%

What this is

This page reverses the usual 13F view: instead of "what does Buffett hold," it answers "who holds NVDA?" Across the dozen tracked filers, all current 13F-disclosed holders of CIEN are listed, with the position size and what fraction of each filer's overall portfolio it represents.

Caveats: only the filers tracked here are included (~12 names) — not the whole 13F universe (~6,000 filers). Position values are at the most recent quarter-end, not current market price. Only long positions are visible; shorts and synthetics aren't.

v0.2 · 2026 · data via SEC EDGAR · CUSIP→ticker via OpenFIGI