Insider transactions

William C Fallon

CIK 1334233 · CEO & President · last filed 2026-03-05

William C Fallon is a CEO & President who has filed 54 SEC Form 4 insider transactions across 1 company since 2007. The most recent filing shows the insider had shares withheld for taxes covering $272.8K of MBI on Mar 5, 2026. Across all open-market trades the lifetime net is +$2.2M, making them a net buyer over the disclosed history. Current disclosed insider exposure totals $12.5M across reported positions. 63 SEC filings were submitted jointly with MBIA INC.

"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
$12.47M
Companies
1
Total Filings
54
Lifetime Open-Market Net
$2.24M

Charts

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

MBI price and trades

Daily close with each Form 4 filing on this company marked: green = open-market buy, red = open-market sale, purple = grants, exercises, gifts and other non-market transactions. Marker size scales with the dollar value.

Shares held

Shares owned after each reported transaction on this company (direct holdings as reported).

Open-market buying and selling

by month

Dollar value of open-market purchases (code P, up) and sales (code S, down) across all companies, by filing month. Grants, exercises and gifts are excluded.

Exposure by company

latest
OfficerDirector10% owner* stale (no filing in 3 yrs)

Most recently reported shares × current price. Faded bars (*) have had no filing in 3 years, so the person may no longer hold them. Click a bar to chart that company.

Filer Profile

Reported Address
C/O MBIA INC.
1 MANHATTANVILLE ROAD, SUITE 202
PURCHASE, NY 10577
Related Filers
MBIA INC — 63 joint filings, latest 2026-03-05
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
MBI CEO & President 2,826,660 $4.41 $12.47M $2.24M 54 2026-03-05

Recent Filings

54 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
2026-03-05 MBI Tax (F) −39,658 -$272.8K EDGAR
2026-03-04 MBI Mixed +214,582 $1.39M EDGAR
2026-03-04 MBI Mixed +214,312 $1.39M EDGAR
2026-01-05 MBI Grant (A) +14,220 $101.8K EDGAR
2025-03-05 MBI Mixed +247,227 $1.36M EDGAR
2025-03-04 MBI Tax (F) −556,019 -$3.07M EDGAR
2024-03-06 MBI Mixed +211,855 $1.37M EDGAR
2024-03-05 MBI Tax (F) −39,659 -$256.6K EDGAR
2024-03-04 MBI Tax (F) −38,812 -$260.4K EDGAR
2024-02-22 MBI Grant (A) +24,917 $168.7K EDGAR
Showing 1–10 of 54
Page 1 of 6
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.