SRB CORP 4

What Happened
SRB Corporation (reported as a 10% owner/acting investment manager) sold 1,199 shares of Safety Insurance Group Inc. (SAFT) common stock in an open-market or private sale on March 17, 2026. The shares were sold at $73.06 per share for total proceeds of $87,599. This filing was made jointly by SRB and The Plymouth Rock Company Incorporated (PRC).

Key Details

• Transaction date: 2026-03-17; Sale price: $73.06 per share; Shares sold: 1,199; Total value: $87,599. (Transaction code S = Sale.)
• Form 4 filed: 2026-03-19 (timely filing within standard Section 16 reporting window).
• Shares owned after the transaction: not specified in the provided excerpt of the filing.
• Notable footnotes: joint filing by SRB and PRC (F1–F2). SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager; SRB disclaims beneficial ownership of the reported shares. PRC and various subsidiaries/managed entities are reported to hold substantial aggregate positions (examples from footnotes: PRC holds 4,120 shares; certain PRC subsidiaries aggregate ~787,007 shares; PSIA and related subsidiaries aggregate ~1,017,679 shares). The filing disclaims that the joint filing constitutes admission of a “group” for other regulatory purposes.

Context

• This was a sale by an institutional/10% owner entity (investment manager), not an individual executive. Such institutional sales can reflect portfolio rebalancing or other non-fundamental reasons and are not, by themselves, proof of company-specific issues.
• The filing does not indicate option exercises, gifts, tax withholding, or a 10b5-1 plan in the provided excerpt.