Comparable stake leader
DIMENSIONAL FUND ADVISORS LP
SEC ownership of IDT CORP
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001005731.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
31 Mar 2026
- Public ticker
- IDT on NYSE
- Parsed ownership sources
- 13D/G, 13F, and 3/4/5
- Largest SEC-reported holder
- DIMENSIONAL FUND ADVISORS LP
- Latest 13D/G holder
- DIMENSIONAL FUND ADVISORS LP
- Latest parsed ownership date
- 31 Mar 2026
- Issuer CIK
- 0001005731
- Issuer location
- Newark, NJ
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
2 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of IDT 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
DIMENSIONAL FUND ADVISORS LP
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
31 Mar 2026
13D/G
13F
3/4/5
Lead comparable stake: 4.3%
13D/G row: DIMENSIONAL FUND ADVISORS LP
Showing 1-8 of 50 holder rows.
Quick read
DIMENSIONAL FUND ADVISORS LP leads the comparable SEC ownership view at 4.3%.
50 of 50 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 DIMENSIONAL FUND ADVISORS LP's linked filing trail.
Comparable ownership
Top 5
DIMENSIONAL FUND ADVISORS LP
4.3%
Judah Schorr
0.55%
Irwin Katsof
0.01%
Eric F. Cosentino
0%
BlackRock, Inc.
7.5%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| DIMENSIONAL FUND ADVISORS LP |
13D/G
13F
Company
|
4.3%
|
$50,349,145
1,011,027 shares
|
$0 | 31 Mar 2025 |
| Judah Schorr |
3/4/5
Director
|
0.55%
|
$6,576,463
129,557 shares
|
— | 05 Jan 2026 |
| Irwin Katsof |
3/4/5
Director
|
0.01%
|
$122,169
2,408 shares
|
— | 05 Jan 2026 |
| Eric F. Cosentino |
3/4/5
Director
|
0%
|
$52,713
1,039 shares
|
-$63,147 | 05 Jan 2026 |
| BlackRock, Inc. |
13F
Company
|
7.5%
|
$87,101,322
1,773,958 shares
|
— | 31 Mar 2026 |
| RENAISSANCE TECHNOLOGIES LLC |
13F
Company
|
4%
|
$46,449,238
946,013 shares
|
— | 31 Mar 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
Company
|
3.7%
|
$43,261,421
881,088 shares
|
— | 31 Mar 2026 |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
Company
|
2.6%
|
$29,697,153
604,728 shares
|
— | 31 Mar 2026 |
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
Net insider flow leans to selling over the last 12 months. Net value: -$4,524,967.
Buys
$0
Insiders: 0
Sells
$4,524,967
Insiders: 5
Net
-$4,524,967
Shares: -89,499
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 89,499
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 28,204 | $0 | $1,435,715 | -$1,435,715 |
| 3-6 | 0 | 18,362 | $0 | $944,937 | -$944,937 |
| 6-9 | 0 | 42,133 | $0 | $2,090,691 | -$2,090,691 |
| 9-12 | 0 | 800 | $0 | $53,624 | -$53,624 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-14 of 14 reporting-owner rows connected to IDT CORP. Open a relationship link for the CIK-to-CIK filing trail.
Rows
14
Largest Forms 3/4/5 holder
Howard S. Jonas
Net 12M change
-$4,524,967
Latest report
07 May 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Howard S. Jonas | Chairman, Director, 10%+ Owner | $125,924,806 | Mixed | 28 Jan 2026 | ||
| Samuel Jonas | Chief Executive Officer | $12,260,664 | Mixed | 30 Sep 2024 | ||
| Judah Schorr | Director | $6,576,463 | Mixed | 05 Jan 2026 | ||
| Joyce J. Mason | EVP and Corporate Secretary | $4,220,732 | -$289,179 | -6.4% | Median | 07 May 2026 |
| Marcelo Fischer | Chief Financial Officer | $2,971,677 | -$698,597 | -19% | Mixed | 14 Apr 2026 |
| Bill Pereira | COO & President, Director | $1,980,060 | -$2,454,044 | -55% | Mixed | 15 Jan 2026 |
| Menachem Ash | EVP of Strategic&Legal Affairs | $1,785,557 | -$1,020,000 | -36% | Mixed | 14 Apr 2026 |
| Michael Chenkin | Director | $1,406,287 | Mixed | 05 Jan 2024 | ||
| Nadine Shea | EVP of GLOBAL HUMAN RESOURCES | $809,784 | Mixed | 18 Sep 2025 | ||
| Mitch Silberman | CAO & Controller | $239,460 | Mixed | 17 Mar 2025 | ||
| Irwin Katsof | Director | $122,169 | Mixed | 05 Jan 2026 | ||
| Eric F. Cosentino | Director | $52,713 | -$63,147 | -55% | Mixed | 05 Jan 2026 |
| David Wartell | Chief Technology Officer | $0 | Mixed | 18 Sep 2025 | ||
| Elaine S. Yatzkan | Director | Mixed | 13 Dec 2023 |
Recent insider transactions for IDT 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Joyce J. Mason | IDT | Class B Common Stock, par value $.01 per share | Gift | 2.51% | 722 | 29,430 | 07 May 2026 | By Self for Son | ||
| Joyce J. Mason | IDT | Class B Common Stock, par value $.01 per share | Gift | 5.87% | 722 | 13,027 | 07 May 2026 | By Self for Husband | ||
| Joyce J. Mason | IDT | Class B Common Stock, par value $.01 per share | Gift | 1.89% | 722 | 38,929 | 07 May 2026 | Direct | ||
| Howard S. Jonas | IDT | Class B Common Stock, $.01 par value per share | Gift | -14% | -7,942 | 48,770 | 07 May 2026 | Direct | ||
| Howard S. Jonas | IDT | Class B Common Stock, $.01 par value per share | Gift | -2.03% | -1,175 | 56,712 | 05 May 2026 | Direct | ||
| Howard S. Jonas | IDT | Class B Common Stock, $.01 par value per share | Gift | -1.03% | -600 | 57,887 | 16 Apr 2026 | Direct | ||
| Joyce J. Mason | IDT | Class B Common Stock, par value $.01 per share | Sale | -6.86% | $46,206 | $50.94 | -907 | 12,305 | 16 Apr 2026 | By Self for Husband |
| Joyce J. Mason | IDT | Class B Common Stock, par value $.01 per share | Sale | -5.67% | $117,009 | $50.94 | -2,297 | 38,207 | 16 Apr 2026 | Direct |
| Menachem Ash | IDT | Class B Common Stock, $.01 par value per share | Sale | -38.3% | $1,020,000 | $51.00 | -20,000 | 32,243 | 14 Apr 2026 | Direct |
| Marcelo Fischer | IDT | Class B Common Stock, par value $.01 per share | Sale | -8.18% | $252,500 | $50.50 | -5,000 | 56,147 | 14 Apr 2026 | Direct |
| Menachem Ash | IDT | Class B Common Stock, $.01 par value per share | Tax liability | -0.66% | -347 | 52,243 | 17 Feb 2026 | Direct | ||
| Menachem Ash | IDT | Class B Common Stock, $.01 par value per share | Options Exercise | 1.61% | 834 | 52,590 | 17 Feb 2026 | Direct | ||
| Menachem Ash | IDT | Deferred Stock Units | Options Exercise | -16.7% | -834 | 4,166 | 17 Feb 2026 | Direct | ||
| Howard S. Jonas | IDT | Class B Common Stock, $.01 par value per share | Gift | -3.65% | -2,214 | 58,487 | 28 Jan 2026 | Direct | ||
| Joyce J. Mason | IDT | Class B Common Stock, par value $.01 per share | Sale | -8.03% | $125,964 | $50.28 | -2,505 | 28,708 | 16 Jan 2026 | By Self for Son |
| Marcelo Fischer | IDT | Class B Common Stock, par value $.01 per share | Options Exercise | 9.3% | 5,204 | 61,147 | 16 Jan 2026 | Direct | ||
| Marcelo Fischer | IDT | Employee Stock Option (right to buy) | Options Exercise | -28.8% | -5,204 | 12,890 | 16 Jan 2026 | Direct | ||
| Bill Pereira | IDT | Class B Common Stock, $.01 par value per share | Sale | -17.2% | $372,876 | $51.17 | -7,287 | 35,213 | 15 Jan 2026 | Direct |
| Marcelo Fischer | IDT | Class B Common Stock, par value $.01 per share | Sale | -1.62% | $47,879 | $52.04 | -920 | 55,943 | 15 Jan 2026 | Direct |
| Marcelo Fischer | IDT | Class B Common Stock, par value $.01 per share | Sale | -11% | $364,702 | $52.03 | -7,009 | 56,863 | 14 Jan 2026 | Direct |
| Marcelo Fischer | IDT | Class B Common Stock, par value $.01 per share | Sale | -0.99% | $33,516 | $52.29 | -641 | 63,872 | 08 Jan 2026 | Direct |
| Irwin Katsof | IDT | Class B Common Stock, par value $.01 per share | Award | 69.3% | 986 | 2,408 | 05 Jan 2026 | Direct | ||
| Judah Schorr | IDT | Class B Common Stock, par value $.01 per share | Award | 0.81% | 986 | 122,425 | 05 Jan 2026 | Direct | ||
| Eric F. Cosentino | IDT | Class B Common Stock, $.01 par value per share | Award | 1860.4% | 986 | 1,039 | 05 Jan 2026 | Direct | ||
| Howard S. Jonas | IDT | Class B Common Stock, $.01 par value per share | Other | -46% | -97,163 | 114,106 | 29 Dec 2025 | By Debbie Y. Jonas 2018 Dynasty Trust | ||
| Howard S. Jonas | IDT | Class B Common Stock, $.01 par value per share | Gift | -1.86% | -1,150 | 60,701 | 17 Dec 2025 | Direct | ||
| Joyce J. Mason | IDT | Class B Common Stock, par value $.01 per share | Gift | 3.31% | 1,000 | 31,213 | 25 Nov 2025 | By Self for Son | ||
| Howard S. Jonas | IDT | Class B Common Stock, $.01 par value per share | Gift | -1.59% | -1,000 | 61,851 | 25 Nov 2025 | Direct | ||
| Eric F. Cosentino | IDT | Class B Common Stock, $.01 par value per share | Sale | -79% | $9,523 | $47.61 | -200 | 53 | 10 Oct 2025 | Direct |
| Bill Pereira | IDT | Class B Common Stock, $.01 par value per share | Sale | -49.7% | $2,081,168 | $49.63 | -41,933 | 42,500 | 02 Oct 2025 | Direct |
| Joyce J. Mason | IDT | Deferred Stock Units | Award | 2,000 | 2,000 | 18 Sep 2025 | Direct | |||
| David Wartell | IDT | Deferred Stock Units | Award | 5,000 | 5,000 | 18 Sep 2025 | Direct | |||
| Nadine Shea | IDT | Deferred Stock Units | Award | 2,000 | 2,000 | 18 Sep 2025 | Direct | |||
| Bill Pereira | IDT | Deferred Stock Units | Award | 15,000 | 15,000 | 18 Sep 2025 | Direct | |||
| Marcelo Fischer | IDT | Deferred Stock Units | Award | 15,000 | 15,000 | 18 Sep 2025 | Direct | |||
| Menachem Ash | IDT | Deferred Stock Units | Award | 5,000 | 5,000 | 18 Sep 2025 | Direct | |||
| Joyce J. Mason | IDT | Class B Common Stock, par value $.01 per share | Gift | 2.2% | 650 | 30,213 | 17 Jul 2025 | By Self for Son | ||
| Joyce J. Mason | IDT | Class B Common Stock, par value $.01 per share | Gift | 5.17% | 650 | 13,212 | 17 Jul 2025 | By Self for Husband | ||
| Joyce J. Mason | IDT | Class B Common Stock, par value $.01 per share | Gift | 1.63% | 650 | 40,504 | 17 Jul 2025 | Direct | ||
| Howard S. Jonas | IDT | Class B Common Stock, $.01 par value per share | Gift | -10.2% | -7,150 | 62,851 | 17 Jul 2025 | Direct | ||
| Howard S. Jonas | IDT | Class B Common Stock, $.01 par value per share | Gift | -1.69% | -1,200 | 70,001 | 15 Jul 2025 | Direct | ||
| Eric F. Cosentino | IDT | Class B Common Stock, $.01 par value per share | Sale | -76% | $53,624 | $67.03 | -800 | 253 | 16 Jun 2025 | Direct |
* marks a reported price that did not pass the local price check.