William Blair & Company
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William Blair & Company’s Cogent Communications CCOI Stock Holding History

William Blair & Company’s Portfolio CCOI Stock Details CCOI Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2017
Q3 		– Sell
-100
Closed -$4K – 1384
2017
Q2 		$4K Hold
100
– – ﹤0.01% 1610
2017
Q1 		$4K Buy
+100
New +$4.17K ﹤0.01% 1442

Other funds holding CCOI

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
TCAM
Turtle Creek Asset Management Toronto, Ontario, Canada $2.56B AUM 1.05% 1-Year Est. Return
PWAM
Park West Asset Management San Francisco, California $1.47B AUM 86.42% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
EIG
EdgePoint Investment Group Toronto, Ontario, Canada $13.2B AUM 32.43% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
NM
Newtyn Management New York $801M AUM 23.14% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Citadel Advisors
Citadel Advisors Miami, Florida $875B AUM 40.89% 1-Year Est. Return

William Blair & Company's CCOI Position: Q2 2026 in Review

William Blair & Company reduced its Cogent Communications (CCOI) stake by 19% in Q2 2026, selling an estimated $593K and leaving 134,381 shares worth $1.87M. The position accounts for ﹤0.01% of the portfolio, ranked #780.

William Blair & Company first reported a position in CCOI in Q2 2013 and has held it in 53 quarters since. The position peaked at $32.8M in Q4 2021. 224 funds tracked by Wall St. Rank hold CCOI as of Q2 2026.

  • William Blair & Company held 134,381 shares of Cogent Communications worth $1.87M as of Q2 2026.
  • William Blair & Company sold 32,140 Cogent Communications shares in Q2 2026, an estimated $593K.
  • Cogent Communications made up ﹤0.01% of William Blair & Company's portfolio in Q2 2026, its #780 holding.
  • William Blair & Company first reported a position in Cogent Communications in Q2 2013 and has held it in 53 quarters since.
  • William Blair & Company's Cogent Communications position peaked at $32.8M in Q4 2021.
  • 224 funds tracked by Wall St. Rank held Cogent Communications as of Q2 2026.

Based on William Blair & Company's 13F filing for Q2 2026, filed 11 Aug 2026.