Home

Brett R Hagen

CIK 1681782 · Chief Accounting Officer · last filed 2026-03-23

Brett R Hagen is a Chief Accounting Officer who has filed 84 SEC Form 4 insider transactions across 3 companies since 2016. The most recent filing, for KLRS, was dated Mar 23, 2026. Across all open-market trades the lifetime net is −$728.1K, making them a net seller over the disclosed history.

"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.

Loading insider history…
Disclosed Exposure

$0

Companies

3

Total Filings

84

Lifetime Open-Market Net

-$728.1K

Filer Profile

Reported Address
200 TECHNOLOGY SQUARE, 4TH FLOOR
CAMBRIDGE, MA 02139
Profile details as reported on the filer's SEC submissions — for individual insiders the address is often in care of the issuer. Related filers are identified from jointly filed SEC submissions and shared reported addresses. View filings on SEC EDGAR.

Holdings By Company

Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
Symbol Role Shares Price Disclosed Exposure Lifetime OM Net Filings Latest Filed
KLRS Chief Accounting Officer 0 $3.12 $0 -$21.0K 3 2026-03-23
Kalaris Therapeutics, Inc. (ALVR) Delisted Chief Accounting Officer 2,832 $9.81 $27.8K -$707.1K 44 2025-02-24
KINETA, INC./DE (PTI) Delisted See Remarks — — — $0 2 2017-04-05

Recent Filings

84 filings
Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
Filed Symbol Action Net Shares Net $ Link
2026-03-23 KLRS Mixed −1,915 -$12.9K EDGAR
2026-03-20 KLRS Notice (144) −1,915 -$12.9K EDGAR
2025-04-11 KLRS Grant (A) — $0 EDGAR
2025-03-27 KLRS Sell (S) −907 -$8.1K EDGAR
2025-02-24 Kalaris Therapeutics, Inc. (ALVR) Delisted Sell (S) −96 -$967 EDGAR
2025-02-24 KLRS Notice (144) −96 -$967 EDGAR
2025-01-27 Kalaris Therapeutics, Inc. (ALVR) Delisted Sell (S) −36 -$342 EDGAR
2025-01-24 KLRS Notice (144) −36 -$341 EDGAR
2025-01-13 Kalaris Therapeutics, Inc. (ALVR) Delisted Sell (S) −332 -$146 EDGAR
2025-01-10 KLRS Notice (144) −332 -$146 EDGAR
Showing 1–10 of 84
Page 1 of 9
Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.