SEC Form 4
Ferroglobe PLC (GSM) insider trading
In the 12 months to Oct 26, 2026, one GSM insider reported open-market sales of $138.9K across 1 filing; 2 insiders bought $200.6K.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $138.9K
- 1 filing · 1 insider
- Open-market purchases
- $200.6K
- 2 filings
Who traded GSM, and when
- Purchase
- Sale
GSM daily close from Oct 27, 2025 to Oct 26, 2026, between $3.14 and $5.45, last $3.93. 1 sale and 2 purchase filings by 3 insiders, marked at their filing dates. Cos Muntanola Beatriz Garcia, CHIEF FINANCE OFFICER: sold $138.9K across 1 filing, first filed Aug 20, 2026, last Aug 20, 2026. de Fuentes Silvia Villar-Mir, Director: bought $100.3K across 1 filing, first filed Mar 25, 2026, last Mar 25, 2026. Madrid Javier Lopez, Executive Chairman: bought $100.3K across 1 filing, first filed Mar 25, 2026, last Mar 25, 2026.
Largest mark · tap a row for others
Cos Muntanola Beatriz Garcia · CHIEF FINANCE OFFICER
Sale $138,856
32,292 shares
Filed Aug 20, 2026 · traded Aug 14
Close on filing date $3.85
Cos Muntanola Beatriz Garcia · CHIEF FINANCE OFFICER
CHIEF FINANCE OFFICER
$138.9K soldde Fuentes Silvia Villar-Mir · Director
Director
$100.3K boughtMadrid Javier Lopez · Executive Chairman
Executive Chairman
$100.3K boughtOpen-market trades
3 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Cos Muntanola Beatriz Garcia | CHIEF FINANCE OFFICER | $138.9K | — | 1 | — | |
| de Fuentes Silvia Villar-Mir | Director | — | $100.3K | 1 | — | |
| Madrid Javier Lopez | Executive Chairman | — | $100.3K | 1 | — |
| Filed | Insider | Type | Shares | Value | Held after | Source |
|---|---|---|---|---|---|---|
traded | Cos Muntanola Beatriz Garcia CHIEF FINANCE OFFICER | Sale | 32,292 ordinary shares | $138.9K | 31,693 | |
traded | Madrid Javier Lopez Executive Chairman | Purchase | 26,000 ordinary shares | $100.3K | 147,200 | |
traded | de Fuentes Silvia Villar-Mir Director | Purchase | 26,000 ordinary shares | $100.3K | 121,226 |
Shares are as filed (ordinary shares or ADS); values are as converted to US$ in the filing.
GET /stocks/filings/vX/form-4?tickers=GSM&filing_date.gte=2025-10-26&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"GSM"
],
"issuer_cik": "0001639877",
"owner_cik": "0002116273",
"accession_number": "0001104659-26-099033",
"form_type": "4",
"filing_date": "2026-08-20",
"period_of_report": "2026-08-11",
"issuer_name": "Ferroglobe PLC",
"issuer_trading_symbol": "GSM",
"owner_name": "Garcia Cos Muntanola Beatriz",
"is_director": false,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "CHIEF FINANCE OFFICER",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "ORDINARY SHARES",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-08-14",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 32292,
"transaction_price_per_share": 4.3,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 31693,
"transaction_value": 138855.6,
"not_subject_to_section_16": false,
"direct_or_indirect": "D"
},
{
"tickers": [
"GSM"
],
"issuer_cik": "0001639877",
"owner_cik": "0002116814",
"accession_number": "0001104659-26-034492",
"form_type": "4",
"filing_date": "2026-03-25",
"period_of_report": "2026-03-23",
"issuer_name": "Ferroglobe PLC",
"issuer_trading_symbol": "GSM",
"owner_name": "Lopez Madrid Javier",
"is_director": true,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "Executive Chairman",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Ordinary shares",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-03-23",
"transaction_code": "P",
"equity_swap_involved": false,
"transaction_shares": 26000,
"transaction_price_per_share": 3.8586,
"transaction_acquired_disposed": "A",
"shares_owned_following_transaction": 147200,
"transaction_value": 100323.6,
"not_subject_to_section_16": false,
"direct_or_indirect": "I",
"nature_of_ownership": "By Financiera Siacapital SL"
}
]
}
// trimmed to 2 resultsThe response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.
Other insider activity (not market trades) · 6 records
- Option exercises3 records
- Tax withholding3 records
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
How to read this page
- Open-market purchase or sale
- A buy or sell of the company's stock at market price. Grants, option exercises, shares withheld for tax, gifts and employee stock plan purchases are listed separately and not counted.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.
Frequently asked questions
How current is GSM’s insider data?
These are GSM Form 4 filings from the last year, refreshed daily. The Massive Form 4 API has the full, continuously updated record.
What counts as an open-market buy or sell?
Only purchases and sales at the market price. Option exercises, grants, gifts, and shares withheld for taxes are reported on Form 4 but are left out of the buy and sell totals.
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This page joins two Massive endpoints: Form 4 filings and daily prices. Ask an agent to watch for new filings:
Using the Massive API (massive.com/docs/llms.txt), check Form 4 filings for GSM every day with transaction_code=P and tell me when an insider files an open-market purchase, with their role, shares, price and the filing link.
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