A Form 4 is filed within two business days of a company insider — an officer, a director, or a holder of more than ten percent of the stock — changing their position in the shares. All 5 filings in this group are Form 4s for Safety Insurance Group, Inc.
The difficulty with reading these filings as a group is that a single form type covers transactions that mean entirely different things. An executive spending their own money to buy stock and an executive having shares withheld to pay tax on a vesting grant both appear as a Form 4. Every filing below is therefore tagged with the nature of the underlying transaction, taken from the transaction code reported on the form itself.
Across the 5 insider filings shown, the breakdown is 5 open-market sale. 5 of them involved a discretionary open-market trade; the rest are compensation and administrative mechanics.
Form 4
Open-market sale
Insider Selling
2026-07-28
SAFT insider SRB CORP (10% Owner) sold 1,240,352 shares (~$127.84M)
SRB CORP, listed as 10% Owner at SAFETY INSURANCE GROUP INC, reported an open-market sale of 1,240,352 SAFT shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.
The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Transactions reported on this filing
| Code |
Nature |
Shares |
Price |
Value |
S |
Open-market sale
|
466,175 |
$103.09 |
$48.06M |
S |
Open-market sale
|
774,177 |
$103.05 |
$79.78M |
Filing: Form 4 (Insider Transaction)
Insider: SRB CORP (10% Owner)
Shares: 1,240,352
Est. Value: $127.84M
Form 4
Open-market sale
Insider Selling
2026-07-27
SAFT insider SRB CORP (10% Owner) sold 38,835 shares (~$4.00M)
SRB CORP, listed as 10% Owner at SAFETY INSURANCE GROUP INC, reported an open-market sale of 38,835 SAFT shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.
The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Transactions reported on this filing
| Code |
Nature |
Shares |
Price |
Value |
S |
Open-market sale
|
38,835 |
$103.08 |
$4.00M |
Filing: Form 4 (Insider Transaction)
Insider: SRB CORP (10% Owner)
Shares: 38,835
Est. Value: $4.00M
Form 4
Open-market sale
Insider Selling
2026-07-20
SAFT insider SRB CORP (10% Owner) sold 5,159 shares (~$392.2K)
SRB CORP, listed as 10% Owner at SAFETY INSURANCE GROUP INC, reported an open-market sale of 5,159 SAFT shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.
The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Transactions reported on this filing
| Code |
Nature |
Shares |
Price |
Value |
S |
Open-market sale
|
5,159 |
$76.03 |
$392.2K |
Filing: Form 4 (Insider Transaction)
Insider: SRB CORP (10% Owner)
Shares: 5,159
Est. Value: $392.2K
Form 4
Open-market sale
Insider Selling
2026-07-14
SAFT insider SRB CORP (10% Owner) sold 34,272 shares (~$2.61M)
SRB CORP, listed as 10% Owner at SAFETY INSURANCE GROUP INC, reported an open-market sale of 34,272 SAFT shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.
The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Transactions reported on this filing
| Code |
Nature |
Shares |
Price |
Value |
S |
Open-market sale
|
34,272 |
$76.04 |
$2.61M |
Filing: Form 4 (Insider Transaction)
Insider: SRB CORP (10% Owner)
Shares: 34,272
Est. Value: $2.61M
Form 4
Open-market sale
Insider Selling
2026-07-10
SAFT insider SRB CORP (10% Owner) sold 2,650 shares (~$202.8K)
SRB CORP, listed as 10% Owner at SAFETY INSURANCE GROUP INC, reported an open-market sale of 2,650 SAFT shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.
The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Transactions reported on this filing
| Code |
Nature |
Shares |
Price |
Value |
S |
Open-market sale
|
2,650 |
$76.51 |
$202.8K |
Filing: Form 4 (Insider Transaction)
Insider: SRB CORP (10% Owner)
Shares: 2,650
Est. Value: $202.8K