Dave Schaeffer

CEO · COGENT COMMUNICATIONS HOLDINGS, INC.

Rank #7,730 SEC EDGAR (United States) ↗ Files from United States

Details

Officer and board memberTelecommunicationsUnited StatesBorn Apr 24, 1956 · age 70University of Maryland, College ParkCCOISEC CIK 0001166976

Computed from SEC EDGAR filings and closing prices — not copied from any wealth ranking. Dataset . How we calculate this.

Disclosed holdings
$9.3M
1-day change
▲ 0.70%
Positions on file
1
issuers disclosed in Forms 3/4/5 and Schedules 13D/G

Disclosed holdings over time 53 weekly points

What the 1 currently disclosed position would have been worth at each week’s closing price. A rising line means the shares got more valuable, not that this person bought more.

How the line is built

Share counts are as last reported to the SEC and held constant; only prices move.

2025-09-05$8.5M – $40.3M2026-09-04

Insider activity Apr 1, 2024 – Dec 31, 2025

Dave Schaeffer is recorded in filings to the U.S. SEC via EDGAR as officer and board member, and reported 53 transactions between Apr 1, 2024 and Dec 31, 2025. The buy and sell totals below count only codes P, S.

Why the other codes are excluded

Share awards (A), shares withheld to pay tax (F), option exercises (M) and gifts (G) also appear in the table, but they are consequences of a pay package or a private transfer, not a decision to buy or sell on the open market. Counting them would turn this into a compensation ranking.

Open-market buys (code P)
None
0 purchases on file
Open-market sales (code S)
$160.01M
45 sales on file priced rows only
All reported transactions
53
every code, including awards and exercises
Pattern
Net seller in the final 12 months of the window
last 12 months of the window

Events from filings

Detected automatically in the filings linked below. Each headline is built from the numbers in those filings, not written by a model. Newest first; events older than 45 days stay listed and are marked as older.

Dave Schaeffer sold 818,909 COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) shares for $22,519,998 on Aug 8, 2025

Large trade for this person

Flagged because this trade was large compared with this person’s own earlier open-market trades in the same currency — not because it is large in absolute terms. A trade that is routine for one insider can be flagged for another.

Dave Schaeffer sold 818,909 COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) shares for $22,519,998 on Aug 8, 2025
Date Insider Transaction Shares Price Value Filing
Aug 8, 2025 Dave Schaeffer S Open-market sale 818,909 held after: 697,143 $27.50 $22,519,998 SEC filing ↗

Source: SEC EDGAR (United States); every row links to where it was published. Event computed Sep 14, 2026.

Dave Schaeffer sold 818,909 COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) shares for $22,519,998 on Aug 8, 2025

Unusual change in a direct holding

Flagged because the change that day in the shares this person holds directly was unusually large compared with their own earlier changes. The rows below are the open-market trades reported that day; under each share count is the balance the filing reports after that line.

Dave Schaeffer sold 818,909 COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) shares for $22,519,998 on Aug 8, 2025
Date Insider Transaction Shares Price Value Filing
Aug 8, 2025 Dave Schaeffer S Open-market sale 818,909 held after: 697,143 $27.50 $22,519,998 SEC filing ↗

Source: SEC EDGAR (United States); every row links to where it was published. Event computed Sep 14, 2026.

Dave Schaeffer sold 1,840,669 COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) shares for $60,005,809 on Aug 7, 2025

Large trade for this person

Flagged because this trade was large compared with this person’s own earlier open-market trades in the same currency — not because it is large in absolute terms. A trade that is routine for one insider can be flagged for another.

Dave Schaeffer sold 1,840,669 COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) shares for $60,005,809 on Aug 7, 2025
Date Insider Transaction Shares Price Value Filing
Aug 7, 2025 Dave Schaeffer S Open-market sale 1,840,669 held after: 1,516,052 $32.60 $60,005,809 SEC filing ↗

Source: SEC EDGAR (United States); every row links to where it was published. Event computed Sep 14, 2026.

Dave Schaeffer sold 1,840,669 COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) shares for $60,005,809 on Aug 7, 2025

Unusual change in a direct holding

Flagged because the change that day in the shares this person holds directly was unusually large compared with their own earlier changes. The rows below are the open-market trades reported that day; under each share count is the balance the filing reports after that line.

Dave Schaeffer sold 1,840,669 COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI) shares for $60,005,809 on Aug 7, 2025
Date Insider Transaction Shares Price Value Filing
Aug 7, 2025 Dave Schaeffer S Open-market sale 1,840,669 held after: 1,516,052 $32.60 $60,005,809 SEC filing ↗

Source: SEC EDGAR (United States); every row links to where it was published. Event computed Sep 14, 2026.

Reported transactions

Price 0.00 is a real reported figure on gifts (G) and share awards (A) — not a missing number. The 25 most recent rows are grouped into 15 lines by date, company and transaction type — open a line to see every lot with its own source link. We hold 59 on file in total. See the full history on EDGAR ↗

How to read this list

Every row is one line of one Form 4 or Form 5, with the filing it came from. Where the record carries no price at all we leave the cell empty instead of guessing one.

The shares and money on a grouped line add up only the lots listed inside that line, and only when every one of them carries the figure. Where a group mixes more than one reporting currency we leave the money blank rather than convert — no source publishes the rate that conversion would need.

  1. COGENT COMMUNICATIONS HOLDINGS, INC. CCOI G Bona fide gift × 2not a buy/sell decisionreported at zero 2,000,000 shares $0
    The 2 lots that make up this line, each with the source behind it.
    Shares Price Value Filing
    1,000,000 $0.00reported at zero $0 SEC filing ↗
    1,000,000 $0.00reported at zero $0 SEC filing ↗
  2. COGENT COMMUNICATIONS HOLDINGS, INC. CCOI A Grant or awardnot a buy/sell decisionreported at zero 1,000,000 shares $0 at $0.00 SEC filing ↗
  3. COGENT COMMUNICATIONS HOLDINGS, INC. CCOI G Bona fide gift × 2not a buy/sell decisionreported at zero 58,666 shares $0
    The 2 lots that make up this line, each with the source behind it.
    Shares Price Value Filing
    29,333 $0.00reported at zero $0 SEC filing ↗
    29,333 $0.00reported at zero $0 SEC filing ↗
  4. COGENT COMMUNICATIONS HOLDINGS, INC. CCOI D Disposition to the issuernot a buy/sell decisionreported at zero 58,667 shares $0 at $0.00 SEC filing ↗
  5. COGENT COMMUNICATIONS HOLDINGS, INC. CCOI A Grant or awardnot a buy/sell decisionreported at zero 229,657 shares $0 at $0.00 SEC filing ↗
  6. COGENT COMMUNICATIONS HOLDINGS, INC. CCOI G Bona fide gift × 2not a buy/sell decisionreported at zero 459,314 shares $0
    The 2 lots that make up this line, each with the source behind it.
    Shares Price Value Filing
    229,657 $0.00reported at zero $0 SEC filing ↗
    229,657 $0.00reported at zero $0 SEC filing ↗
  7. COGENT COMMUNICATIONS HOLDINGS, INC. CCOI S Open-market sale 818,909 shares $22.52M at $27.50 SEC filing ↗
  8. COGENT COMMUNICATIONS HOLDINGS, INC. CCOI S Open-market sale 1,840,669 shares $60.01M at $32.60 SEC filing ↗
  9. COGENT COMMUNICATIONS HOLDINGS, INC. CCOI S Open-market sale × 2 70,000 shares $3.30M
    The 2 lots that make up this line, each with the source behind it.
    Shares Price Value Filing
    25,000 $47.05 $1.18M SEC filing ↗
    45,000 $47.14 $2.12M SEC filing ↗
  10. COGENT COMMUNICATIONS HOLDINGS, INC. CCOI S Open-market sale × 2 55,000 shares $2.61M
    The 2 lots that make up this line, each with the source behind it.
    Shares Price Value Filing
    10,000 $47.34 $473.4K SEC filing ↗
    45,000 $47.42 $2.13M SEC filing ↗
  11. COGENT COMMUNICATIONS HOLDINGS, INC. CCOI S Open-market sale × 2 55,000 shares $2.63M
    The 2 lots that make up this line, each with the source behind it.
    Shares Price Value Filing
    45,000 $47.87 $2.15M SEC filing ↗
    10,000 $47.83 $478.3K SEC filing ↗
  12. COGENT COMMUNICATIONS HOLDINGS, INC. CCOI S Open-market sale × 2 55,000 shares $2.67M
    The 2 lots that make up this line, each with the source behind it.
    Shares Price Value Filing
    45,000 $48.55 $2.18M SEC filing ↗
    10,000 $48.35 $483.5K SEC filing ↗
  13. COGENT COMMUNICATIONS HOLDINGS, INC. CCOI S Open-market sale × 2 55,000 shares $2.68M
    The 2 lots that make up this line, each with the source behind it.
    Shares Price Value Filing
    40,000 $48.70 $1.95M SEC filing ↗
    15,000 $48.63 $729.5K SEC filing ↗
  14. COGENT COMMUNICATIONS HOLDINGS, INC. CCOI S Open-market sale × 2 55,000 shares $2.68M
    The 2 lots that make up this line, each with the source behind it.
    Shares Price Value Filing
    15,000 $48.99 $734.9K SEC filing ↗
    40,000 $48.51 $1.94M SEC filing ↗
  15. COGENT COMMUNICATIONS HOLDINGS, INC. CCOI S Open-market sale × 2 80,000 shares $3.82M
    The 2 lots that make up this line, each with the source behind it.
    Shares Price Value Filing
    30,000 $47.78 $1.43M SEC filing ↗
    50,000 $47.78 $2.39M SEC filing ↗

Disclosed holdings

Shares is the amount on the form; value is that amount times the closing price shown. Rows with no closing price are left blank, so they may add up to less than the headline figure.

What is not counted here

Each row is one filing you can open. Private companies, real estate, bonds and crypto are not in SEC insider filings and are therefore not counted here.

Equity positions disclosed to the SEC, with the source filing behind each row.
Issuer Ticker Security Shares Close Value Form Reported Filing
COGENT COMMUNICATIONS HOLDINGS, INC. CCOI common stock 926,800 $10.05 $9.3M 4 EDGAR ↗

Other insiders at the same companies

People who also file with the SEC at a company where Dave Schaeffer reports shares.

Sharing a filing does not mean they work together day to day — it means both names appear on the same issuer’s insider record.

Sources

The filings linked in the tables above are the sources for every figure on this page.

Think a number here is wrong? Open the linked filing and compare — how to report it.

Profile record last refreshed Sep 8, 2026.