Insider transactions

Matthew H. Birenbaum

CIK 1532949 · Executive Vice President & CDO · last filed 2026-08-24

Matthew H. Birenbaum is an Executive Vice President & CDO who has filed 46 SEC Form 4 insider transactions across 2 companies since 2011. The most recent filing, for VMRK, was dated Aug 24, 2026. Across all open-market trades the lifetime net is −$4.6M, 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.

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Disclosed Exposure
$0
Companies
2
Total Filings
46
Lifetime Open-Market Net
-$4.62M

Charts

Trading activity, where the exposure sits, and each trade against the stock price.

Filer Profile

Reported Address
671 NORTH GLEBE ROAD, SUITE 800
ARLINGTON, VA 22203
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
VMRK Executive Vice President & CDO 272,749 — — $0 2 2026-08-24
AVALONBAY COMMUNITIES INC (AVB) Delisted Chief Investment Officer 0 $184.06 $0 -$4.62M 42 2026-08-17

Recent Filings

46 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
2026-08-24 VMRK Gift (G) −1,400 $0 EDGAR
2026-08-19 VMRK Grant (A) +35,946 $0 EDGAR
2026-08-17 AVALONBAY COMMUNITIES INC (AVB) Delisted Mixed −85,285 $0 EDGAR
2026-06-22 AVALONBAY COMMUNITIES INC (AVB) Delisted Tax (F) −7,595 -$1.35M EDGAR
2026-03-03 AVALONBAY COMMUNITIES INC (AVB) Delisted Tax (F) −5,706 -$1.01M EDGAR
2026-03-02 AVALONBAY COMMUNITIES INC (AVB) Delisted Grant (A) +20,067 $0 EDGAR
2025-06-18 AVALONBAY COMMUNITIES INC (AVB) Delisted Gift (G) −500 $0 EDGAR
2025-03-04 AVALONBAY COMMUNITIES INC (AVB) Delisted Mixed −6,449 -$1.36M EDGAR
2025-02-28 AVALONBAY COMMUNITIES INC (AVB) Delisted Grant (A) +13,774 $0 EDGAR
2024-08-07 AVALONBAY COMMUNITIES INC (AVB) Delisted Sell (S) −5,000 -$1.04M EDGAR
Showing 1–10 of 46
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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.