Comparable stake leader
OPEN TEXT CORP
SEC ownership of ZIX CORP
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000855612.
Disclosed value leader
Maribess L. Miller
Comparable rows
0/8
Latest evidence
23 Dec 2021
- Parsed ownership sources
-
3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
OPEN TEXT CORP
Ranking: Comparable ownership first, then disclosed value
- Latest parsed ownership date
-
23 Dec 2021
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0000855612
- Issuer location
- Dallas, TX
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
1 signal
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of ZIX CORP (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
OPEN TEXT CORP
Disclosed value leader
Maribess L. Miller
Comparable rows
0/8
Latest evidence
23 Dec 2021
3/4/5
Highest disclosed value: $474,623
8 rows are not safely comparable across share classes.
Quick read
Maribess L. Miller has the largest disclosed position value at $474.6K.
0 of 8 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Maribess L. Miller's linked filing trail.
Disclosed position value
Top 4
OPEN TEXT CORP
$8.5K
Maribess L. Miller
$474.6K
Robert C. Hausmann
$397K
Mark J. Bonney
$331.9K
Value bars compare disclosed positions; verify each figure against the linked filing evidence.
Detailed SEC evidence table Showing 1-8 of 8 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| OPEN TEXT CORP |
3/4/5
10%+ Owner
|
—
class O/S missing
|
$8,500
1,000 shares
|
— | 23 Dec 2021 |
| Maribess L. Miller |
3/4/5
Director
|
—
class O/S missing
|
$474,623
55,838 shares
|
— | 23 Dec 2021 |
| Robert C. Hausmann |
3/4/5
Director
|
—
class O/S missing
|
$397,044
46,711 shares
|
— | 23 Dec 2021 |
| Mark J. Bonney |
3/4/5
Director
|
—
class O/S missing
|
$331,917
39,049 shares
|
— | 23 Dec 2021 |
| David Wagner |
3/4/5
President, CEO, Director
|
—
class O/S missing
|
—
210,379 shares
|
— | 23 Dec 2021 |
| David E. Rockvam |
3/4/5
CFO
|
—
class O/S missing
|
—
96,634 shares
|
— | 23 Dec 2021 |
| John P. di Leo |
3/4/5
Chief Revenue Officer
|
—
class O/S missing
|
—
82,139 shares
|
— | 23 Dec 2021 |
| Ryan Allphin |
3/4/5
Chief Product Officer
|
—
class O/S missing
|
—
72,457 shares
|
— | 23 Dec 2021 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 09 Jul 2025.
Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-12 of 12 reporting-owner rows connected to ZIX CORP. Open a relationship link for the CIK-to-CIK filing trail.
Rows
12
Largest Forms 3/4/5 holder
Maribess L. Miller
Net 12M change
$0
Latest report
23 Dec 2021
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Maribess L. Miller | Director | $474,623 | Mixed | 23 Dec 2021 | ||
| Robert C. Hausmann | Director | $397,044 | Mixed | 23 Dec 2021 | ||
| Mark J. Bonney | Director | $331,917 | Mixed | 23 Dec 2021 | ||
| OPEN TEXT CORP | 10%+ Owner | $8,500 | Mixed | 23 Dec 2021 | ||
| ZEPHYR HOLDCO, LLC | Director, 10%+ Owner | Mixed | 22 Dec 2021 | |||
| David Wagner | President, CEO, Director | Mixed | 23 Dec 2021 | |||
| David E. Rockvam | Cfo | Mixed | 23 Dec 2021 | |||
| Maryclaire Campbell | Director | Mixed | 23 Dec 2021 | |||
| Ryan Allphin | Chief Product Officer | Mixed | 23 Dec 2021 | |||
| Taher Elgamal | Director | Mixed | 23 Dec 2021 | |||
| Noah F. Webster | Chief Legal Officer | Mixed | 23 Dec 2021 | |||
| John P. di Leo | Chief Revenue Officer | Mixed | 23 Dec 2021 |
Recent insider transactions for ZIX CORP
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| No insider transactions were found in the last 12 months for this issuer. | ||||||||||
* marks a reported price that did not pass the local price check.