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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 $1.4M across reported positions.

"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

$1.38M

Companies

2

Total Filings

40

Lifetime Open-Market Net

-$271.8K

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 $8.01 $1.38M -$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.