Ronald A Duncan
CIK 905853 · President and CEO · last filed 2026-06-04
Ronald A Duncan is a President and CEO who has filed 76 SEC Form 4 insider transactions across 5 companies since 2007. Across all open-market trades the lifetime net is −$33.2M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $4.7M across reported positions. 101 SEC filings were submitted jointly with GCI LIBERTY, INC.
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
Charts
Trading activity, where the exposure sits, and each trade against the stock price.
GLIBP price and trades
Daily close with each Form 4 filing on this company marked: green = open-market buy, red = open-market sale, purple = grants, exercises, gifts and other non-market transactions. Marker size scales with the dollar value.
Shares held
Shares owned after each reported transaction on this company (direct holdings as reported).
Open-market buying and selling
by monthDollar value of open-market purchases (code P, up) and sales (code S, down) across all companies, by filing month. Grants, exercises and gifts are excluded.
Exposure by company
latestMost recently reported shares × current price. Faded bars (*) have had no filing in 3 years, so the person may no longer hold them. Click a bar to chart that company.
Filer Profile
ENGLEWOOD, CO 80112
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| GLIBK | President and CEO | 172,680 | $27.39 | $4.73M | $1.42M | 9 | 2026-06-04 |
| Liberty Capital Corp/NV (GLIBR) Delisted | President and CEO | 141,744 | — | — | $0 | 1 | 2025-12-11 |
| GLIBA | Director | 0 | $27.16 | $0 | $0 | 1 | 2020-12-22 |
| GRIZZLY MERGER SUB 1, LLC (GLIBP) Delisted | Director | 961,118 | — | — | -$33.75M | 16 | 2020-11-24 |
| GRIZZLY MERGER SUB 1, LLC (GNCMA) Delisted | CEO | 1,229,156 | — | — | -$849.7K | 41 | 2018-03-05 |
Holdings By Holder
| Symbol | Holder | Shares | Share of Total | Reported |
|---|---|---|---|---|
| GLIBK | Direct | 130,164 | 75.4% | 2026-06-04 |
| Indirect | 42,516 | 24.6% | 2026-06-04 | |
| Total | 172,680 | |||
| GLIBR | Direct | 109,909 | 77.5% | 2025-12-11 |
| By 560 Company, Inc. | 20,578 | 14.5% | 2025-12-11 | |
| By Spouse | 7,516 | 5.3% | 2025-12-11 | |
| By Missy, LLC | 2,022 | 1.4% | 2025-12-11 | |
| By RAD, LLC | 1,162 | 0.8% | 2025-12-11 | |
| By 401(k) Savings Plan | 557 | 0.4% | 2025-12-11 | |
| Total | 141,744 | |||
| GLIBA | Direct | 0 | — | 2020-12-22 |
| By GRAT - Ron Duncan 2017 | 0 | — | 2020-12-22 | |
| By Missy, LLC | 0 | — | 2020-12-22 | |
| By Spouse | 0 | — | 2020-12-22 | |
| By 560 Company, Inc. | 0 | — | 2020-12-22 | |
| Total | 0 | |||
| GLIBP | Direct | 647,064 | 67.3% | 2020-11-24 |
| By 560 Company, Inc. | 151,206 | 15.7% | 2020-11-24 | |
| By GRAT - Ron Duncan 2017 | 100,000 | 10.4% | 2020-11-24 | |
| By Spouse | 46,828 | 4.9% | 2020-11-24 | |
| By Missy, LLC | 12,600 | 1.3% | 2020-11-24 | |
| By 401(k) Savings Plan | 3,420 | 0.4% | 2020-11-24 | |
| Total | 961,118 | |||
| No longer reported | ||||
| Lowndes Trust prior to the distribution of shares and the trust's dissolution as described in footnote 1 By Neoma N. Lowndes 2006 Revocable Trust |
0 | — | last 2020-02-05 | |
| by Amanda Miller Trust | 7,400 | — | last 2018-03-12 | |
| by 560 Company | 0 | — | last 2018-03-12 | |
| by Neoma Lowndes Trust | 1,500 | — | last 2018-03-12 | |
| by 401(k) | 1,832 | — | last 2018-03-12 | |
| by Daughter | 0 | — | last 2018-03-12 | |
| GNCMA | Direct | 694,623 | 56.5% | 2018-03-05 |
| by 560 Company | 390,378 | 31.8% | 2018-03-05 | |
| by Spouse | 63,186 | 5.1% | 2018-03-05 | |
| by Amanda Miller Trust | 37,000 | 3.0% | 2018-03-05 | |
| by Daughter | 18,560 | 1.5% | 2018-03-05 | |
| by Missy, LLC | 15,000 | 1.2% | 2018-03-05 | |
| by Neoma Lowndes Trust | 7,500 | 0.6% | 2018-03-05 | |
| by 401(k) | 2,909 | 0.2% | 2018-03-05 | |
| Total | 1,229,156 | |||
| No longer reported | ||||
| by Missy, LLC/Trust/Daughter | 5,000 | — | last 2013-12-04 | |
| by Missy, LLC/Spouse | 5,000 | — | last 2013-12-04 | |
| by Trust | 160,879 | — | last 2013-12-04 | |
| by LLC/Trst/Daughter | 131 | — | last 2009-11-24 | |
| Company on behalf of Mr by Corporation |
0 | — | last 2009-01-05 | |
Recent Filings
76 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-06-04 | — | Buy (P) | +67,500 | $1.42M | |
| 2026-06-04 | GLIBK | Buy (P) | +67,500 | $1.42M | EDGAR |
| 2026-02-23 | — | Mixed | +11,875 | -$305.9K | |
| 2026-02-23 | GLIBK | Mixed | +11,875 | -$305.9K | EDGAR |
| 2026-01-06 | — | Mixed | +5,055 | -$71.5K | |
| 2026-01-06 | GLIBK | Mixed | +5,055 | -$71.5K | EDGAR |
| 2025-12-23 | — | Tax (F) | −174 | -$6.3K | |
| 2025-12-23 | GLIBK | Tax (F) | −174 | -$6.3K | EDGAR |
| 2025-12-22 | — | Mixed | +442 | $0 | |
| 2025-12-22 | GLIBK | Mixed | +442 | $0 | EDGAR |
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment, and an amended or cancelled notice is not listed. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes. Someone who is no longer an officer or director (or never was) files no Form 4, so for them a sale shows up only on a later notice, which lists the seller's sales from the 3 months before it. "No sale on file" means neither record shows one; a dash in Net $ means the value filed on the notice doesn't fit the stock's price (likely a typo).