Insider at

04

Insider transactions

05
0 buys (P) 4 sells (S) Net: $-411,759 + 27 non-open-market transactions below last 12 months, based on the transactions shown below

Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

27 other filings hidden
DateTickerCodeSharesPriceValue Owned afterΔ ownA/Dvs now
Sept. 2, 2026 CCOI S 4,850 $9.37 $45,444 193,050 Direct -2.45% Disposed -5.2% (price as of 2026-10-05)
June 16, 2026 CCOI S 4,850 $16.79 $81,432 197,900 Direct -2.39% Disposed -47.1% (price as of 2026-10-05)
March 5, 2026 CCOI S 4,850 $22.63 $109,756 202,750 Direct -2.34% Disposed -60.8% (price as of 2026-10-05)
Dec. 11, 2025 CCOI S 7,300 $23.99 $175,127 88,200 Direct -7.64% Disposed -63.0% (price as of 2026-10-05)
Sept. 2, 2025 CCOI S 4,900 $36.98 $181,202 93,100 Direct -5.00% Disposed -76.0% (price as of 2026-10-05)
June 9, 2025 CCOI S 4,900 $48.04 $235,396 98,000 Direct -4.76% Disposed -81.5% (price as of 2026-10-05)
May 28, 2025 CCOI S 100 $47.66 $4,766 102,900 Direct -0.10% Disposed -81.4% (price as of 2026-10-05)
May 16, 2025 CCOI S 0 · · 103,000 Direct 0.00% Disposed (price as of 2026-10-05)
May 16, 2025 CCOI S 100 $50.41 $5,041 102,900 Direct -0.10% Disposed -82.4% (price as of 2026-10-05)
March 3, 2025 CCOI S 4,900 $72.06 $353,094 103,000 Direct -4.54% Disposed -87.7% (price as of 2026-10-05)
Dec. 2, 2024 CCOI S 4,800 $81.58 $391,584 88,500 Direct -5.14% Disposed -89.1% (price as of 2026-10-05)
Sept. 3, 2024 CCOI S 2,400 $69.68 $167,232 90,900 Direct -2.57% Disposed -87.3% (price as of 2026-10-05)
June 10, 2024 CCOI S 2,400 $52.60 $126,240 93,300 Direct -2.51% Disposed -83.1% (price as of 2026-10-05)
March 12, 2024 CCOI S 2,400 $68.17 $163,608 95,700 Direct -2.45% Disposed -87.0% (price as of 2026-10-05)
Dec. 4, 2023 CCOI S 9,700 $65.84 $638,648 48,700 Direct -16.61% Disposed -86.5% (price as of 2026-10-05)
Sept. 5, 2023 CCOI S 4,850 $69.43 $336,736 53,550 Direct -8.30% Disposed -87.2% (price as of 2026-10-05)
June 5, 2023 CCOI S 4,850 $62.28 $302,058 58,400 Direct -7.67% Disposed -85.7% (price as of 2026-10-05)
May 9, 2023 CCOI S 10,000 $64.96 $649,600 63,250 Direct -13.65% Disposed -86.3% (price as of 2026-10-05)
March 3, 2023 CCOI S 4,850 $64.30 $311,855 73,250 Direct -6.21% Disposed -86.2% (price as of 2026-10-05)
Dec. 2, 2022 CCOI S 9,700 $56.51 $548,147 48,700 Direct -16.61% Disposed -84.3% (price as of 2026-10-05)
Sept. 9, 2022 CCOI S 4,850 $52.35 $253,898 53,550 Direct -8.30% Disposed -83.0% (price as of 2026-10-05)
June 2, 2022 CCOI S 4,850 $60.49 $293,376 58,400 Direct -7.67% Disposed -85.3% (price as of 2026-10-05)
March 3, 2020 CCOI S 10b5-1 4,850 $81.37 $394,644 72,850 Direct -6.24% Disposed -89.1% (price as of 2026-10-05)
Dec. 31, 2019 CCOI S 10b5-1 4,250 $66.07 $280,798 58,300 Direct -6.79% Disposed -86.6% (price as of 2026-10-05)
Dec. 3, 2019 CCOI S 5,000 $61.74 $308,700 62,550 Direct -7.40% Disposed -85.6% (price as of 2026-10-05)
Sept. 5, 2019 CCOI S 5,000 $60.00 $300,000 67,550 Direct -6.89% Disposed -85.2% (price as of 2026-10-05)
June 13, 2019 CCOI S 1,400 $60.84 $85,176 72,550 Direct -1.89% Disposed -85.4% (price as of 2026-10-05)
June 5, 2019 CCOI S 5,000 $58.50 $292,500 73,950 Direct -6.33% Disposed -84.8% (price as of 2026-10-05)
May 6, 2019 CCOI S 1,500 $57.11 $85,665 78,950 Direct -1.86% Disposed -84.5% (price as of 2026-10-05)
March 12, 2019 CCOI S 5,000 $50.00 $250,000 61,050 Direct -7.57% Disposed -82.2% (price as of 2026-10-05)
Dec. 14, 2018 CCOI S 3,000 $46.89 $140,670 66,050 Direct -4.34% Disposed -81.1% (price as of 2026-10-05)
Sept. 5, 2018 CCOI S 4,500 $53.55 $240,975 69,050 Direct -6.12% Disposed -83.4% (price as of 2026-10-05)
June 4, 2018 CCOI S 4,500 $51.12 $230,040 73,550 Direct -5.77% Disposed -82.6% (price as of 2026-10-05)
May 9, 2018 CCOI S 3,000 $49.32 $147,960 78,050 Direct -3.70% Disposed -82.0% (price as of 2026-10-05)
March 12, 2018 CCOI S 6,000 $45.17 $271,020 81,050 Direct -6.89% Disposed -80.3% (price as of 2026-10-05)
Dec. 7, 2017 CCOI S 2,000 $45.81 $91,620 67,650 Direct -2.87% Disposed -80.6% (price as of 2026-10-05)
Sept. 1, 2017 CCOI S 3,000 $47.03 $141,090 69,650 Direct -4.13% Disposed -81.1% (price as of 2026-10-05)
Aug. 7, 2017 CCOI S 2,250 $43.51 $97,898 72,650 Direct -3.00% Disposed -79.6% (price as of 2026-10-05)
June 15, 2017 CCOI S 2,250 $40.76 $91,710 74,900 Direct -2.92% Disposed -78.2% (price as of 2026-10-05)
June 2, 2017 CCOI S 2,250 $41.20 $92,700 77,150 Direct -2.83% Disposed -78.4% (price as of 2026-10-05)
March 15, 2017 CCOI S 2,250 $41.17 $92,632 60,000 Direct -3.61% Disposed -78.4% (price as of 2026-10-05)
Jan. 4, 2017 CCOI S 10b5-1 5,000 $42.50 $212,500 62,250 Direct -7.43% Disposed -79.1% (price as of 2026-10-05)
Jan. 3, 2017 CCOI S 20,000 $41.52 $830,400 67,250 Direct -22.92% Disposed -78.6% (price as of 2026-10-05)
Dec. 13, 2016 CCOI S 2,000 $40.67 $81,340 87,250 Direct -2.24% Disposed -78.2% (price as of 2026-10-05)
Dec. 7, 2016 CCOI S 5,000 $37.91 $189,550 89,250 Direct -5.31% Disposed -76.6% (price as of 2026-10-05)
June 3, 2016 CCOI S 5,000 $40.07 $200,350 94,250 Direct -5.04% Disposed -77.8% (price as of 2026-10-05)
May 9, 2016 CCOI S 4,250 $39.14 $166,345 99,250 Direct -4.11% Disposed -77.3% (price as of 2026-10-05)
Feb. 29, 2016 CCOI S 5,250 $36.87 $193,568 79,250 Direct -6.21% Disposed -75.9% (price as of 2026-10-05)
Nov. 9, 2015 CCOI S 10,000 $34.61 $346,100 84,500 Direct -10.58% Disposed -74.3% (price as of 2026-10-05)
March 16, 2015 CCOI S 4,250 $35.26 $149,855 94,500 Direct -4.30% Disposed -74.8% (price as of 2026-10-05)
Sept. 9, 2014 CCOI S 5,250 $34.07 $178,868 62,750 Direct -7.72% Disposed -73.9% (price as of 2026-10-05)
June 12, 2014 CCOI S 7,500 $35.34 $265,050 68,000 Direct -9.93% Disposed -74.9% (price as of 2026-10-05)
May 9, 2013 CCOI S 11,250 $28.85 $324,562 75,499 Direct -12.97% Disposed -69.2% (price as of 2026-10-05)
March 14, 2013 CCOI S 5,000 $25.71 $128,550 86,749 Direct -5.45% Disposed -65.5% (price as of 2026-10-05)
Feb. 25, 2013 CCOI S 5,000 $25.21 $126,050 91,749 Direct -5.17% Disposed -64.8% (price as of 2026-10-05)
Nov. 28, 2012 CCOI S 10,000 $21.10 $211,000 108,749 Direct -8.42% Disposed -57.9% (price as of 2026-10-05)
March 15, 2012 CCOI S 8,750 $18.56 $162,400 50,749 Direct -14.71% Disposed -52.2% (price as of 2026-10-05)
Feb. 29, 2012 CCOI S 4,500 $18.48 $83,160 59,499 Direct -7.03% Disposed -51.9% (price as of 2026-10-05)
Feb. 27, 2012 CCOI S 7,500 $18.36 $137,700 63,999 Direct -10.49% Disposed -51.6% (price as of 2026-10-05)
Dec. 1, 2011 CCOI S 5,000 $17.02 $85,100 71,499 Direct -6.54% Disposed -47.8% (price as of 2026-10-05)
Nov. 7, 2011 CCOI S 5,000 $16.54 $82,700 76,499 Direct -6.14% Disposed -46.3% (price as of 2026-10-05)
July 15, 2011 CCOI S 10b5-1 5,000 $16.62 $83,100 81,499 Direct -5.78% Disposed -46.6% (price as of 2026-10-05)
July 1, 2011 CCOI S 10b5-1 1,250 $17.05 $21,312 86,499 Direct -1.42% Disposed -47.9% (price as of 2026-10-05)
April 15, 2011 CCOI S 10b5-1 28,400 $12.93 $367,212 87,749 Direct -24.45% Disposed -31.3% (price as of 2026-10-05)
April 1, 2011 CCOI S 10b5-1 1,250 $14.73 $18,412 119,749 Direct -1.03% Disposed -39.7% (price as of 2026-10-05)
Feb. 1, 2011 CCOI S 10b5-1 439 $13.92 $6,111 120,999 Direct -0.36% Disposed -36.2% (price as of 2026-10-05)
Jan. 14, 2011 CCOI S 10b5-1 3,125 $15.00 $46,875 121,438 Direct -2.51% Disposed -40.8% (price as of 2026-10-05)
Jan. 3, 2011 CCOI S 10b5-1 1,666 $14.14 $23,557 121,438 Direct -1.35% Disposed -37.2% (price as of 2026-10-05)
Dec. 1, 2010 CCOI S 10b5-1 416 $12.29 $5,113 123,104 Direct -0.34% Disposed -27.7% (price as of 2026-10-05)
Nov. 1, 2010 CCOI S 10b5-1 416 $10.71 $4,455 103,520 Direct -0.40% Disposed -17.1% (price as of 2026-10-05)
Oct. 13, 2010 CCOI S 10b5-1 625 $10.00 $6,250 103,936 Direct -0.60% Disposed -11.2% (price as of 2026-10-05)
Oct. 11, 2010 CCOI S 10b5-1 625 $10.00 $6,250 104,561 Direct -0.59% Disposed -11.2% (price as of 2026-10-05)
Oct. 1, 2010 CCOI S 10b5-1 1,041 $9.43 $9,817 105,186 Direct -0.98% Disposed -5.8% (price as of 2026-10-05)

Showing latest 100 of 264 transactions

P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding

Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.

Derivative holdings (Form 4 Table II) Options, RSUs and convertible securities reported on Form 4 Table II.

06
DateTickerSecurityUnderlying Exercise priceExpirationSharesA/D
Jan. 14, 2011 CCOI Option to purchase common stock common stock (3,125) · Oct. 26, 2015 3,125 Disposed
Nov. 3, 2010 CCOI option to purchase common stock [F1] common stock (50,000) $25.46 April 30, 2017 50,000 Disposed
Dec. 4, 2008 CCOI Option to purchase common stock common stock (284) · Sept. 8, 2014 284 Disposed
May 1, 2008 CCOI Option to purchase common stock common stock (280) · Sept. 8, 2014 280 Disposed
April 28, 2008 CCOI Option to purchase common stock common stock (625) · Oct. 26, 2015 625 Disposed
April 2, 2008 CCOI Option to purchase common stock common stock (280) · Sept. 8, 2014 280 Disposed
March 3, 2008 CCOI Option to purchase common stock common stock (280) · Sept. 8, 2014 280 Disposed
Feb. 1, 2008 CCOI Option to purchase common stock common stock (280) · Sept. 8, 2014 280 Disposed
Jan. 28, 2008 CCOI Option to purchase common stock common stock (625) · Oct. 26, 2015 625 Disposed
Jan. 2, 2008 CCOI Option to purchase common stock common stock (280) · Sept. 8, 2014 280 Disposed
Dec. 3, 2007 CCOI Option to purchase common stock common stock (280) · Oct. 8, 2015 280 Disposed
Nov. 1, 2007 CCOI Option to purchase common stock common stock (280) · Oct. 8, 2015 280 Disposed
Oct. 26, 2007 CCOI Option to purchase common stock common stock (625) · Oct. 26, 2015 625 Disposed
Oct. 1, 2007 CCOI Option to purchase common stock common stock (280) · Oct. 8, 2015 280 Disposed
Sept. 4, 2007 CCOI Option to purchase common stock common stock (280) · Oct. 8, 2015 280 Disposed
Aug. 1, 2007 CCOI Option to purchase common stock common stock (280) · Oct. 8, 2015 280 Disposed
July 26, 2007 CCOI Option to purchase common stock common stock (625) · Oct. 26, 2015 625 Disposed
July 2, 2007 CCOI Option to purchase common stock common stock (280) · Oct. 8, 2015 280 Disposed
June 1, 2007 CCOI Option to purchase common stock common stock (280) · Oct. 8, 2015 280 Disposed
May 1, 2007 CCOI Option to purchase common stock common stock (280) · Oct. 8, 2015 280 Disposed
April 30, 2007 CCOI Option to purchase common stock common stock (50,000) · April 30, 2017 50,000 Acquired
April 26, 2007 CCOI Option to purchase common stock common stock (625) · Oct. 26, 2015 625 Disposed
April 2, 2007 CCOI Option to purchase common stock common stock (280) · Sept. 8, 2014 280 Disposed
March 1, 2007 CCOI Option to purchase common stock common stock (280) · Sept. 8, 2014 280 Disposed
Feb. 1, 2007 CCOI Option to purchase common stock common stock (280) · Sept. 8, 2014 280 Disposed
Jan. 26, 2007 CCOI Option to purchase common stock common stock (625) · Oct. 26, 2015 625 Disposed
Jan. 3, 2007 CCOI Option to purchase common stock common stock (280) · Sept. 8, 2014 280 Disposed
Dec. 1, 2006 CCOI Option to purchase common stock common stock (367) $0.00 Oct. 26, 2015 367 Disposed
Nov. 24, 2006 CCOI Option to purchase common stock common stock (3,125) $4.88 Oct. 26, 2015 3,125 Disposed
Nov. 6, 2006 CCOI Option to purchase common stock common stock (275) $0.00 Sept. 8, 2014 275 Disposed
Oct. 5, 2006 CCOI Option to purchase common stock common stock (275) $0.00 Sept. 8, 2014 275 Disposed
Sept. 5, 2006 CCOI Option to purchase common stock common stock (275) $0.00 Sept. 8, 2014 275 Disposed
Aug. 7, 2006 CCOI Option to purchase common stock common stock (275) $0.00 Sept. 8, 2014 275 Disposed
July 5, 2006 CCOI Option to purchase common stock common stock (275) $0.00 Sept. 8, 2014 275 Disposed
June 5, 2006 CCOI Option to purchase common stock common stock (275) $0.00 Sept. 8, 2014 275 Disposed
May 5, 2006 CCOI Option to purchase common stock common stock (275) $0.00 Sept. 8, 2014 275 Disposed
April 5, 2006 CCOI Option to purchase common stock common stock (275) $0.00 Sept. 8, 2014 275 Disposed
March 6, 2006 CCOI Option to purchase common stock common stock (275) $0.00 Sept. 8, 2014 275 Disposed
Feb. 6, 2006 CCOI Option to purchase common stock common stock (275) $0.00 Sept. 8, 2014 275 Disposed
Jan. 5, 2006 CCOI Option to purchase common stock common stock (5,300) $0.00 Sept. 8, 2014 5,300 Disposed
Oct. 26, 2005 CCOI Option to purchase common stock common stock (10,000) · Oct. 26, 2015 10,000 Acquired
Oct. 26, 2005 CCOI Option to purchase common stock common stock (10,000) · Oct. 26, 2015 10,000 Acquired
Feb. 15, 2005 CCOI Option to purchase common stock [F2] common stock [F2] (269,230) $0.00 Sept. 8, 2014 269,230 Acquired
Feb. 15, 2005 CCOI Option to purchase Series H Convertible Preferred Stock [F2] common stock [F2] (269,230) $0.01 Sept. 8, 2014 350 Disposed
Feb. 15, 2005 CCOI Series H Convertible Preferred Stock [F1] Common Stock [F1] (479,230) $0.00 · 623 Disposed
Sept. 8, 2004 CCOI Options to purchase Series H Convertible Preferred Stock [F1] Common Stock (269,230) $0.01 Sept. 8, 2014 350 Acquired
Oct. 10, 2003 CCOI Series H Convertible Preferred Stock Common Stock (479,230) · · 623 Acquired
Oct. 10, 2003 CCOI Option/right to buy [F1] Common Stock (1,084) $2.00 Dec. 1, 2011 1,084 Disposed
Oct. 10, 2003 CCOI Option/right to buy [F1] Common Stock (1,627) $2.00 Dec. 1, 2011 1,627 Disposed
Oct. 10, 2003 CCOI Option/right to buy [F1] Common Stock (9,375) $2.50 Feb. 14, 2010 9,375 Disposed
July 31, 2003 CCOI Series B Participating Convertible Preferred Stock Common Stock (998) $0.00 Aug. 8, 1988 7,692 Disposed

Exercise/conversion price is blank when not applicable (e.g. RSUs).

Initial ownership (Form 3) 1 holding

07

Securities held when first becoming an insider, per SEC Form 3.

DateTickerSecuritySharesOwnership
April 29, 2022 CCOI common stock · Direct