Reporting owner · CIK 0001655513
Maas, Jacob
Visual SEC Form 4 history across 1 companies, 8 transactions and 4 filings.
EVExecutive VPGraham Holdings Co
Open-market mix
—buys
Latest insider transactions
Form 4 filings from available history. Click any column to sort; click it again to flip the order.
| ID | Ticker | Insider | Role | Type | Shares | Value | Code | Filed | Trans date |
|---|---|---|---|---|---|---|---|---|---|
| #187154 | GHC | Maas, Jacob | EV | withholding | 501 | -$58.0M | F | 08/31 | 08/28 |
| #187153 | GHC | Maas, Jacob | EV | grant | 1.00k | $0 | A | 08/31 | 08/28 |
| #77157 | GHC | Maas, Jacob | EV | withholding | 377 | -$43.3M | F | 01/21 | 01/16 |
| #77156 | GHC | Maas, Jacob | EV | grant | 1.00k | $0 | A | 01/21 | 01/16 |
| #58034 | GHC | Maas, Jacob | EV | withholding | 438 | -$40.2M | F | 01/29/2025 | 01/27/2025 |
| #58033 | GHC | Maas, Jacob | EV | grant | 1.00k | $0 | A | 01/29/2025 | 01/27/2025 |
| #23802 | GHC | Maas, Jacob | EV | withholding | 257 | -$22.4M | F | 01/06/2025 | 01/02/2025 |
| #23801 | GHC | Maas, Jacob | EV | grant | 430 | $0 | A | 01/06/2025 | 01/02/2025 |
Latest Form 4 facts
Quick context from source filings
Latest transaction
No latest transaction fact is available.
Latest buy
No open-market insider purchase is available.
Latest sale
No open-market insider sale is available.
Open-market buy performance
90-day forward return on this insider's open-market purchases
Forward return is not available yet
We compute this from each buy's stock performance 90 days after the transaction. The price history is still being populated for this insider's their open-market buys, so the average and median will appear here once the daily price refresh has covered the relevant trading days.
Disclosed ownership
How reported shareholdings evolved
Non-derivative shares held after reported transactions—not stock prices or a complete portfolio.
8 observations · Jan 2, 2025 – Aug 28, 2026. Window ends at the latest available report, not today.
Selected observation · Aug 28, 20267,156 shares reported
Inspect transaction View exact observations and source transactions
| Transaction date | Shares held after | Filed | Source |
|---|---|---|---|
| Jan 2, 2025 | 4,982 | Jan 6, 2025 | View transaction |
| Jan 2, 2025 | 4,725 | Jan 6, 2025 | View transaction |
| Jan 27, 2025 | 5,725 | Jan 29, 2025 | View transaction |
| Jan 27, 2025 | 5,287 | Jan 29, 2025 | View transaction |
| Jan 16, 2026 | 7,034 | Jan 21, 2026 | View transaction |
| Jan 16, 2026 | 6,657 | Jan 21, 2026 | View transaction |
| Aug 28, 2026 | 7,657 | Aug 31, 2026 | View transaction |
| Aug 28, 2026 | 7,156 | Aug 31, 2026 | View transaction |
Securities and direct/indirect ownership contexts are kept separate and never summed. Joint filings may associate the same disclosed row with multiple owners. Unknown values are omitted, not treated as zero. Lines connect observations for readability; they do not establish holdings between filings, cost basis, or current ownership. Amendments and stock splits require reviewing the source.
Monthly open-market activity
Reported purchase and sale transaction counts
Buys Sells
No open-market purchases or sales in this history.
Net value flow
Buys minus sells
Jan 25
$0
Jan 26
$0
Aug 26
$0
Transaction texture
Ownership and ticket size
Average P/S size—
Median P/S size—
Direct8
Indirect0
Aug 28, 2026withholding
Filing-only signals
Deterministic matches in this insider's history
Associated companies
Visual map of known reporting history
Maas, Jacob Insider Activity FAQ
SEC Form 4 context
Who is Maas, Jacob?
Maas, Jacob is a reporting owner in SEC Form 4 filings with reporting owner CIK 0001655513.
Which companies has Maas, Jacob reported transactions for?
Graham Holdings Co
When was Maas, Jacob's latest insider buy?
No open-market insider purchase is available for this period.
When was Maas, Jacob's latest insider sale?
No open-market insider sale is available for this period.
Where can I see the original SEC filings?
Each transaction row links directly to the source SEC filing so the reported Form 4 details can be reviewed.
Are performance metrics included?
This version does not calculate win rates, forward returns, benchmark-adjusted returns, or high-conviction scores.