MARK A ALEXANDER
CIK 1212607 · Chief Executive Officer · last filed 2026-06-02
"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
$31.57M
Companies
5
Total Filings
93
Lifetime Open-Market Net
$2.02M
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 |
|---|---|---|---|---|---|---|---|
| BLDR | Director | 47,913 | $73.68 | $3.53M | $0 | 30 | 2026-06-02 |
| WPC | Director | 51,095 | $75.61 | $3.86M | $1.55M | 23 | 2025-10-03 |
| BMC STOCK HOLDINGS, INC. (BMCH) Delisted | Director | 0 | — | — | $0 | 5 | 2021-01-05 |
| KAYDON CORP (KDN) Delisted | Director | 22,956 | — | — | $464.1K | 33 | 2013-10-02 |
| SPH | Chief Executive Officer | 1,289,912 | $18.74 | $24.17M | $0 | 1 | 2008-12-15 |
Recent Filings · Page 3 of 10
93 filingsInsider 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 |
|---|---|---|---|---|---|
| 2024-06-04 | BLDR | Grant (A) | +1,388 | $31.2K | EDGAR |
| 2024-04-09 | WPC | Grant (A) | +655 | $36.2K | EDGAR |
| 2024-03-05 | BLDR | Grant (A) | +156 | $31.2K | EDGAR |
| 2024-01-08 | WPC | Other (J) | +558 | $36.2K | EDGAR |
| 2023-12-05 | BLDR | Grant (A) | +224 | $31.2K | EDGAR |
| 2023-09-06 | BLDR | Grant (A) | +210 | $31.2K | EDGAR |
| 2023-07-05 | WPC | Grant (A) | +2,553 | $0 | EDGAR |
| 2023-06-16 | BLDR | Grant (A) | +1,446 | $0 | EDGAR |
| 2023-06-05 | BLDR | Grant (A) | +269 | $31.2K | EDGAR |
| 2023-05-03 | WPC | Buy (P) | +1,000 | $72.5K | EDGAR |
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.
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.