Vanguard
· Added
+$1.1B
Change
+3.6M
Date
Q1 2026
CI
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Vanguard
· Added
+$1.1B
Change
+3.6M
Date
Q1 2026
|
Vanguard | Added· Q1 2026 | +$1.1B | +3.6M | – | Q1 2026 | |||||
|
Capital Research Global Investors
· New
+$838M
Change
+2.8M
Date
Q1 2026
|
Capital Research Global Investors | New· Q1 2026 | +$838M | +2.8M | – | Q1 2026 | |||||
|
Geode
· Added
+$420M
Change
+1.4M
Date
Q1 2026
|
Geode | Added· Q1 2026 | +$420M | +1.4M | – | Q1 2026 | |||||
|
State Street
· Added
+$368M
Change
+1.2M
Date
Q1 2026
|
State Street | Added· Q1 2026 | +$368M | +1.2M | – | Q1 2026 | |||||
|
T. Rowe Price Associates
· Added
+$363M
Change
+1.2M
Date
Q1 2026
|
T. Rowe Price Associates | Added· Q1 2026 | +$363M | +1.2M | – | Q1 2026 | |||||
|
Lone Pine Capital LLC
· New
+$247M
Change
+810K
Date
Q1 2026
|
Lone Pine Capital LLC | New· Q1 2026 | +$247M | +810K | – | Q1 2026 | |||||
|
T. Rowe Price Investment Management, Inc.
· Added
+$128M
Change
+418K
Date
Q1 2026
|
T. Rowe Price Investment Management, Inc. | Added· Q1 2026 | +$128M | +418K | – | Q1 2026 | |||||
|
BNP Paribas Financial Markets
· Added
+$110M
Change
+362K
Date
Q1 2026
|
BNP Paribas Financial Markets | Added· Q1 2026 | +$110M | +362K | – | Q1 2026 | |||||
|
Schwab
· Added
+$103M
Change
+337K
Date
Q1 2026
|
Schwab | Added· Q1 2026 | +$103M | +337K | – | Q1 2026 | |||||
|
Goldman Sachs Group Inc
· Added
+$100M
Change
+328K
Date
Q1 2026
|
Goldman Sachs Group Inc | Added· Q1 2026 | +$100M | +328K | – | Q1 2026 | |||||
|
American Century Companies Inc
· Added
+$86M
Change
+283K
Date
Q1 2026
|
American Century Companies Inc | Added· Q1 2026 | +$86M | +283K | – | Q1 2026 | |||||
|
Voya Investment Management LLC
· Added
+$79M
Change
+258K
Date
Q1 2026
|
Voya Investment Management LLC | Added· Q1 2026 | +$79M | +258K | – | Q1 2026 | |||||
|
Robeco Institutional Asset Management B.V.
· Added
+$66M
Change
+216K
Date
Q1 2026
|
Robeco Institutional Asset Management B.V. | Added· Q1 2026 | +$66M | +216K | – | Q1 2026 | |||||
|
Mitsubishi Ufj Asset Management Co., Ltd.
· Added
+$55M
Change
+182K
Date
Q1 2026
|
Mitsubishi Ufj Asset Management Co., Ltd. | Added· Q1 2026 | +$55M | +182K | – | Q1 2026 | |||||
|
Morgan Stanley
· Added
+$54M
Change
+177K
Date
Q1 2026
|
Morgan Stanley | Added· Q1 2026 | +$54M | +177K | – | Q1 2026 | |||||
| Insider | Title | Type | Price | Qty | Value | Owned | ΔOwn | Trade date | Filed date | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Smith Gary B.
· Director
Sell
−$1.2M
|
Smith Gary B. | Director | Sell | $421.10 | −3K | −$1.2M | 252K | −1.2% | Jul 15, 2026 | Jul 17, 2026 | |||||||||
|
Rothenstein David M.
· Officer
Sell
−$1.1M
|
Rothenstein David M. | Officer | Sell | $420.91 | −2K | −$1.1M | 183K | −1.3% | Jul 15, 2026 | Jul 17, 2026 | |||||||||
|
Gage Brodie
· Officer
Sell
−$539K
|
Gage Brodie | Officer | Sell | $449.15 | −1K | −$539K | 40K | −2.9% | Jul 15, 2026 | Jul 17, 2026 | |||||||||
|
Diperna Dino
· Officer
2 operations
−$351K
|
Diperna Dino | Officer | 2 operations | $449.15 | −782 | −$351K | 40K | −1.9% | Jul 15, 2026 | Jul 17, 2026 | |||||||||
|
Kosaraju Sheela
· Officer
Sell
−$938K
|
Kosaraju Sheela | Officer | Sell | $466.20 | −2K | −$938K | 88K | −2.2% | Jul 1, 2026 | Jul 6, 2026 | |||||||||
|
Graff Marc D.
· Officer
Sell
−$59K
|
Graff Marc D. | Officer | Sell | $466.20 | −126 | −$59K | 127K | −0.1% | Jul 1, 2026 | Jul 6, 2026 | |||||||||
|
Phipps Jason
· Officer
Sell
−$1.2M
|
Phipps Jason | Officer | Sell | $466.20 | −3K | −$1.2M | 62K | −4.0% | Jul 1, 2026 | Jul 6, 2026 | |||||||||
|
Smith Gary B.
· Director
Sell
−$1.4M
|
Smith Gary B. | Director | Sell | $468.83 | −3K | −$1.4M | 255K | −1.1% | Jul 1, 2026 | Jul 6, 2026 | |||||||||
|
Cumello Joseph
· Officer
Sell
−$740K
|
Cumello Joseph | Officer | Sell | $466.33 | −2K | −$740K | 43K | −3.6% | Jun 26, 2026 | Jun 30, 2026 | |||||||||
|
Graff Marc D.
· Officer
Sell
−$57K
|
Graff Marc D. | Officer | Sell | $449.36 | −126 | −$57K | 127K | −0.1% | Jun 24, 2026 | Jun 26, 2026 | |||||||||
|
Hoffman Grant
· Officer
Grant (A)
7K
|
Hoffman Grant | Officer | Grant (A) | – | 7K | – | 7K | – | Jun 22, 2026 | Jun 23, 2026 | |||||||||
|
Graff Marc D.
· Officer
Tax withholding or exercise payment (F)
-$85K
|
Graff Marc D. | Officer | Tax withholding or exercise payment (F) | $428.22 | -199 | -$85K | 127K | −0.2% | Jun 20, 2026 | Jun 23, 2026 | |||||||||
|
Smith Gary B.
· Director
4 operations
-$3.8M
|
Smith Gary B. | Director | 4 operations | $428.22 | -9K | -$3.8M | 258K | −3.3% | Jun 20, 2026 | Jun 23, 2026 | |||||||||
|
Rothenstein David M.
· Officer
5 operations
-$1.0M
|
Rothenstein David M. | Officer | 5 operations | $428.22 | -2K | -$1.0M | 185K | −1.3% | Jun 20, 2026 | Jun 23, 2026 | |||||||||
|
Phipps Jason
· Officer
4 operations
-$1.0M
|
Phipps Jason | Officer | 4 operations | $428.22 | -2K | -$1.0M | 65K | −3.5% | Jun 20, 2026 | Jun 23, 2026 | |||||||||
N
A
M
G
A
A
1,065 reporting institutions disclosed CIEN position changes in the Q1 2026 snapshot.
For each manager, WhoBought compares accepted consecutive 13F share counts. Share change is current shares minus prior shares. Estimated dollar change is that signed share change multiplied by the split-adjusted quarter-mean close. The activity table on this page uses Q1 2026.
An investor crossing 5% of a share class generally files Schedule 13D for activist intent or Schedule 13G for a passive position. The technical form names appear here rather than in the activity rows.
Ownership and institutional activity come from SEC Form 13F filings. Insider activity comes from SEC Form 4, and large-shareholder activity from SEC Schedules 13D and 13G. FMP supplies price data only. Company logos use the local verified Parqet cache with one shared fallback.
Form 13F is a quarterly disclosure and is normally filed after the quarter ends. Every ownership and activity value therefore names its represented period; it is not presented as a live position.
A muted dash marks a missing table value. It means the filing omitted the value, comparable data is unavailable, or no prior position exists for comparison.