Mark A. Alexander

Rank #10,036 SEC EDGAR (United States) ↗ Files from United States

Details

Member of the boardReal EstateWPCSEC CIK 0001212607

Computed from SEC EDGAR filings and closing prices — not copied from any wealth ranking. Dataset as of Sep 7, 2026. How we calculate this.

Disclosed holdings

$6.6M

priced as of Sep 7, 2026

1-day change

▲ 1.20%

as of Sep 7, 2026

Positions on file

issuers disclosed in Forms 3/4/5 and Schedules 13D/G

Disclosed holdings over time 53 weekly points

What the 2 currently disclosed positions would have been worth at each week’s closing price. A rising line means the shares got more valuable, not that this person bought more.

How the line is built

Share counts are as last reported to the SEC and held constant; only prices move.

2025-09-05$6.6M – $10.2M2026-09-04

Insider activity Apr 5, 2024 – Mar 1, 2026

Mark A. Alexander is recorded in filings to the U.S. SEC via EDGAR as member of the board, and reported 23 transactions between Apr 5, 2024 and Mar 1, 2026. The buy and sell totals below count only codes P, S.

Why the other codes are excluded

Share awards (A), shares withheld to pay tax (F), option exercises (M) and gifts (G) also appear in the table, but they are consequences of a pay package or a private transfer, not a decision to buy or sell on the open market. Counting them would turn this into a compensation ranking.

Open-market buys (code P)

$586.1K

3 purchases on file priced rows only

Open-market sales (code S)

None

0 sales on file

All reported transactions

every code, including awards and exercises

Pattern

Bought and sold in similar amounts

last 12 months of the window

Reported transactions

Price 0.00 is a real reported figure on gifts (G) and share awards (A) — not a missing number. The 25 most recent rows are grouped into 23 lines by date, company and transaction type — open a line to see every lot with its own source link.

How to read this list

Every row is one line of one Form 4 or Form 5, with the filing it came from. Where the record carries no price at all we leave the cell empty instead of guessing one.

The shares and money on a grouped line add up only the lots listed inside that line, and only when every one of them carries the figure. Where a group mixes more than one reporting currency we leave the money blank rather than convert — no source publishes the rate that conversion would need.

Jun 1, 2026 Builders FirstSource, Inc. BLDR A Grant or awardnot a buy/sell decision 409 shares $31.2K at $76.26 SEC filing ↗
May 14, 2026 Builders FirstSource, Inc. BLDR A Grant or awardnot a buy/sell decisionreported at zero 2,558 shares $0 at $0.00 SEC filing ↗
Mar 1, 2026 Builders FirstSource, Inc. BLDR A Grant or awardnot a buy/sell decision 299 shares $31.2K at $104.29 SEC filing ↗
Dec 1, 2025 Builders FirstSource, Inc. BLDR A Grant or awardnot a buy/sell decision 278 shares $31.2K at $112.23 SEC filing ↗
Oct 1, 2025 W. P. Carey Inc. WPC A Grant or awardnot a buy/sell decision 438 shares $30.0K at $68.47 SEC filing ↗
Sep 1, 2025 Builders FirstSource, Inc. BLDR A Grant or awardnot a buy/sell decision 225 shares $31.2K at $138.68 SEC filing ↗

Jul 1, 2025

W. P. Carey Inc. WPC A Grant or award × 2not a buy/sell decision 3,254 shares $30.0K

The 2 lots that make up this line, each with the source behind it.
Shares	Price	Value	Filing
476	$62.99	$30.0K	SEC filing ↗
2,778	$0.00reported at zero	$0	SEC filing ↗

Jun 1, 2025 Builders FirstSource, Inc. BLDR A Grant or awardnot a buy/sell decision 290 shares $31.2K at $107.68 SEC filing ↗
May 27, 2025 Builders FirstSource, Inc. BLDR A Grant or awardnot a buy/sell decisionreported at zero 1,707 shares $0 at $0.00 SEC filing ↗
Apr 1, 2025 W. P. Carey Inc. WPC A Grant or awardnot a buy/sell decision 475 shares $29.9K at $63.03 SEC filing ↗
Mar 1, 2025 Builders FirstSource, Inc. BLDR A Grant or awardnot a buy/sell decision 224 shares $31.1K at $138.99 SEC filing ↗
Feb 28, 2025 Builders FirstSource, Inc. BLDR A Grant or awardnot a buy/sell decision 224 shares $31.1K at $138.99 SEC filing ↗
Jan 2, 2025 W. P. Carey Inc. WPC A Grant or awardnot a buy/sell decision 552 shares $30.0K at $54.29 SEC filing ↗
Dec 1, 2024 Builders FirstSource, Inc. BLDR A Grant or awardnot a buy/sell decision 167 shares $31.1K at $186.47 SEC filing ↗
Nov 1, 2024 W. P. Carey Inc. WPC P Open-market purchase 5,000 shares $276.5K at $55.29 SEC filing ↗
Oct 1, 2024 W. P. Carey Inc. WPC A Grant or awardnot a buy/sell decision 489 shares $30.0K at $61.32 SEC filing ↗
Sep 1, 2024 Builders FirstSource, Inc. BLDR A Grant or awardnot a buy/sell decision 179 shares $31.1K at $174.00 SEC filing ↗
Aug 16, 2024 W. P. Carey Inc. WPC P Open-market purchase 2,000 shares $114.1K at $57.03 SEC filing ↗
Aug 9, 2024 W. P. Carey Inc. WPC P Open-market purchase 3,500 shares $195.5K at $55.87 SEC filing ↗

Jul 1, 2024

W. P. Carey Inc. WPC A Grant or award × 2not a buy/sell decision 3,866 shares $36.2K

The 2 lots that make up this line, each with the source behind it.
Shares	Price	Value	Filing
663	$54.63	$36.2K	SEC filing ↗
3,203	$0.00reported at zero	$0	SEC filing ↗

Jun 4, 2024 Builders FirstSource, Inc. BLDR A Grant or awardnot a buy/sell decisionreported at zero 1,194 shares $0 at $0.00 SEC filing ↗
Jun 1, 2024 Builders FirstSource, Inc. BLDR A Grant or awardnot a buy/sell decision 194 shares $31.2K at $160.79 SEC filing ↗
Apr 5, 2024 W. P. Carey Inc. WPC A Grant or awardnot a buy/sell decision 655 shares $36.2K at $55.27 SEC filing ↗

Disclosed holdings priced as of Sep 7, 2026

Shares is the amount on the form; value is that amount times the closing price shown. Rows with no closing price are left blank, so they may add up to less than the headline figure.

What is not counted here

Each row is one filing you can open. Private companies, real estate, bonds and crypto are not in SEC insider filings and are therefore not counted here.

Equity positions disclosed to the SEC, with the source filing behind each row.
Issuer	Ticker	Security	Shares	Close	Value	Form	Reported	Filing
W. P. Carey Inc.	WPC	Common Stock	51,095	$70.38as of Sep 4, 2026	$3.6M	4	Oct 1, 2025	EDGAR ↗
Builders FirstSource, Inc.	BLDR	Common Stock, par value $0.01 per share	44,946	$65.79as of Sep 4, 2026	$3.0M	4	Mar 1, 2026	EDGAR ↗

Other insiders at the same companies

People who also file with the SEC at a company where Mark A. Alexander reports shares.

Sharing a filing does not mean they work together day to day — it means both names appear on the same issuer’s insider record.

Amy B Messersmith Other Executive · Builders FirstSource, Inc.
Brett N. Milgrim Chairman · Builders FirstSource, Inc.
Brian H Zander Chief Accounting Officer · W. P. Carey Inc.
Brooks G Gordon Other Executive · W. P. Carey Inc.
Christopher Niehaus Board Member · W. P. Carey Inc.
Cleveland A. Christophe Board Member · Builders FirstSource, Inc.
Cory Jacobs Boydston Board Member · Builders FirstSource, Inc.
Craig Arthur Steinke Board Member · Builders FirstSource, Inc.
David E Rush Board Member · Builders FirstSource, Inc.
Dirkson R Charles Executive · Builders FirstSource, Inc.
Gayatri Narayan President · Builders FirstSource, Inc.
Gino M Sabatini Other Executive · W. P. Carey Inc.

Sources

The filings linked in the tables above are the sources for every figure on this page.

Think a number here is wrong? Open the linked filing and compare — how to report it.

Profile record last refreshed Sep 8, 2026.