THALMAN WILLIAM M purchased ~$149K in L.B. Foster Company stock
L.B. Foster Company (FSTR) · EVP & CFO · Data via SEC EDGAR Form 4
Price Performance · 10 days before → 90 days after trade
▲ = insider buy date
90-day return
+17.8%vs SPY +11.7%
Trade Details · Public SEC Filing
Insider
THALMAN WILLIAM M
Role
EVP & CFO
Transaction
Open-Market Purchase
Approx. Value
~$149K
Trade Date
Aug 8, 2024
Company
L.B. Foster Company
Ticker
FSTRSource
SEC EDGAR Form 4
Why This Trade Stands Out
Strong conviction signal
Scored above average across multiple factors. Roughly 15% of insider trades qualify as Strong.
~$149K purchase
A meaningful investment of personal capital. The average insider purchase is around $150K, putting this in the typical range for serious positions.
EVP & CFO
CFOs have direct access to financials before they become public. Their trades are among the most closely watched by institutional investors.
4 insiders traded in the same window
When multiple insiders independently buy within 30 days, it's called a cluster. Studies show clustered insider purchases outperform solo trades significantly, because several people with inside knowledge are reaching the same conclusion.
+17.8% in 90 days (S&P 500: +11.7%)
This trade beat the S&P 500 by 6.0 percentage points over 90 days. We track performance on every insider trade so you can see who consistently outperforms.
How good is THALMAN WILLIAM M at picking stocks?
Full track record: win rate, average return, and performance vs S&P 500
THALMAN WILLIAM M wasn't the only one buying.
4 insiders at L.B. Foster Company traded within the same 30-day window.
See who else bought · FreeOn August 8, 2024, THALMAN WILLIAM M — EVP & CFO of L.B. Foster Company — filed a Form 4 with the SEC disclosing an open-market purchase of approximately ~$149K in L.B. Foster Company (FSTR) stock.
This transaction was part of a cluster — 4 insiders at L.B. Foster Company made open-market purchases within the same 30-day window. Cluster activity from multiple independent insiders is one of the most studied patterns in insider trading research.
Under Section 16(a) of the Securities Exchange Act of 1934, corporate insiders must report all open-market stock transactions to the SEC within two business days. These filings — known as Form 4s — are publicly available on the SEC's EDGAR database. VeritySignals filters and scores the full Form 4 stream to surface high-conviction signals like this one.
In the 90 days following this trade, FSTR returned +17.8% versus +11.7% for the S&P 500 over the same period.
VeritySignals Conviction Analysis
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All data sourced from publicly available SEC Form 4 filings via EDGAR · Not financial advice · Past performance does not guarantee future results.
At a Glance
More FSTR Insider Activity
English Aron R.
Mar 31, 2026
~$3.6M
VS
Kelly Brian H
Nov 7, 2025
~$1.6M
STRONG
KASEL JOHN F
Sep 12, 2022
~$49K
STRONG
How to Read Insider Trades
What is this?
When company executives buy or sell their own stock, they must report it to the SEC within 2 days. These public filings reveal what the people who know the company best are doing with their own money.
Why does it matter?
Insiders can sell for many reasons (taxes, diversification, expenses), but they generally only buy for one: they think the stock is going up. That's why insider purchases are more predictive than sales.
What makes a trade "strong"?
We score trades on 15+ factors: the insider's role (CEO > director), trade size relative to their salary, whether other insiders also bought (clusters), and historical accuracy of the insider.
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