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MARK CUBAN

CIK 1066154 · last filed 2023-09-15

MARK CUBAN is a corporate insider who has filed 40 SEC Form 4 insider transactions across 2 companies since 2009. The most recent filing shows the insider sold $40.7K of RDIB on Sep 15, 2023. Across all open-market trades the lifetime net is −$271.8K, making them a net seller over the disclosed history. Current disclosed insider exposure totals $2.7M across reported positions. 10 SEC filings were submitted jointly with RADICAL HOLDINGS LP.

"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.

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Disclosed Exposure

$2.74M

Companies

2

Total Filings

40

Lifetime Open-Market Net

-$271.8K

Filer Profile

Reported Address
5424 DELOACHE AVENUE
DALLAS, TX 75220
Related Filers
RADICAL HOLDINGS LP — 10 joint filings, latest 2010-04-08
STARZ ENTERTAINMENT CORP /CN/ — 6 joint filings, latest 2010-06-18
CHARTER COMMUNICATIONS, INC. /MO/ — 3 joint filings, latest 2005-04-25
Radical Investments LP — 1 joint filings, latest 2010-04-08
Profile details as reported on the filer's SEC submissions — for individual insiders the address is often in care of the issuer. Related filers are identified from jointly filed SEC submissions and shared reported addresses. View filings on SEC EDGAR.

Holdings By Company

Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
Symbol Role Shares Price Disclosed Exposure Lifetime OM Net Filings Latest Filed
RDIB 10%+ Owner 172,555 $15.90 $2.74M -$2.87M 27 2023-09-15
READING INTERNATIONAL INC (RDI.B) Delisted 10%+ Owner 207,511 — — $2.60M 1 2009-06-23

Recent Filings

40 filings
Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
Filed Symbol Action Net Shares Net $ Link
2023-09-15 RDIB Sell (S) −2,013 -$40.7K EDGAR
2023-09-13 RDIB Sell (S) −2,969 -$60.0K EDGAR
2023-09-11 RDIB Sell (S) −685 -$13.7K EDGAR
2023-08-07 RDIB Sell (S) −1,056 -$21.4K EDGAR
2023-08-03 RDIB Sell (S) −600 -$12.7K EDGAR
2023-08-01 RDIB Sell (S) −851 -$17.8K EDGAR
2023-07-28 RDIB Sell (S) −100 -$2.0K EDGAR
2023-07-25 RDIB Sell (S) −1,600 -$32.3K EDGAR
2023-07-21 RDIB Sell (S) −501 -$10.1K EDGAR
2023-07-19 RDIB Sell (S) −1,621 -$32.9K EDGAR
Showing 1–10 of 40
Page 1 of 4
Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
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. 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; missing follow-up Form 4s suggest the notice was cancelled or modified.