GSM at a glance
Ferroglobe PLC (GSM, SEC CIK 1639877) filed Form 4 insider filings as recently as September 24, 2026. SignalX summarizes each filing with AI and tracks the company's insider trades and institutional holders.
- As of June 30, 2026, 27 institutional investment managers tracked by SignalX reported holding Ferroglobe PLC (GSM) shares worth $73.2 million in 13F-HR filings.
- The most recent insider open-market sale reported on Form 4 was by Garcia Cos Muntanola Beatriz on August 14, 2026 of 32,292 shares at $4.30 per share.
- In the last 90 days, GSM insiders reported 0 open-market purchases ($0) and 1 open-market sale ($139K) on Form 4, a net sale of $139K.
Source: SEC EDGAR (XBRL financial data, 13F-HR and Form 4 filings).
- Insiders · 90 days
- 0 buys · 1 sell
- Net −$139K
- 13F holders
- 27 funds
- $73.2M · +0 vs prior quarter
SignalX for GSM
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Recent Insider Transactions (Form 4)
Latest reported trades by officers, directors and 10% owners
| Insider | Type | Date | Shares | Price |
|---|---|---|---|---|
| Villar-Mir de Fuentes Silvia | F | Sep 22, 2026 | 6,889 | $4.31 |
| Lopez Madrid Javier | M | Sep 22, 2026 | 28,117 | - |
| Lopez Madrid Javier | F | Sep 22, 2026 | 6,889 | $4.31 |
| Lopez Madrid Javier | M | Sep 22, 2026 | 28,117 | - |
| Villar-Mir de Fuentes Silvia | M | Sep 22, 2026 | 28,117 | - |
| Villar-Mir de Fuentes Silvia | M | Sep 22, 2026 | 28,117 | - |
| Garcia Cos Muntanola Beatriz | Sell | Aug 14, 2026 | 32,292 | $4.30 |
| Garcia Cos Muntanola Beatriz | M | Aug 11, 2026 | 36,784 | - |
13F Fund Holdings: Quarterly Trend
Latest: Q2 2026Aggregate GSM share value held by 13F filers tracked by SignalX, by quarter.
Quarterly totals table
| Quarter | Funds | Total value |
|---|---|---|
| Q2 2026 | 27 | $73.2M |
| Q1 2026 | 27 | $90.5M |
| Q4 2025 | 22 | $125.2M |
| Q3 2025 | 24 | $115.2M |
| Q2 2025 | 23 | $72.9M |
| Q1 2025 | 17 | $42.5M |
| Q4 2024 | 12 | $39.8M |
| Q3 2024 | 12 | $61.9M |
- BlackRock+950.8K (+14%)
- D.E. Shaw & Co+670.6K (+335%)
- Goldman Sachs Group+456.9K (+79%)
- Ameriprise Financial+284.2K (+13%)
- Morgan Stanley+187.1K (+76%)
- Millennium Management−582.6K (-56%)
- Citadel Advisors LLC−527.5K (-74%)
- Bank of America Corp−362.0K (-65%)
- JPMorgan Chase & Co−331.9K (-74%)
- Renaissance Technologies LLC−129.5K (-5%)
Source: 13F-HR filings on SEC EDGAR (aggregated from 164 fund-quarter rows). Reflects only 13F filers tracked by SignalX, not the full institutional ownership universe. How 13F filings work
Latest 2026 SEC Filings: 10-K, 10-Q, 8-K & Form 4
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GSM SEC filings: frequently asked questions
Are GSM insiders buying or selling?
In the last 90 days, Ferroglobe PLC (GSM) officers, directors and 10% owners reported no open-market purchases and 1 open-market sale worth $138,856 by 1 insider on Form 4. Many insider sales are pre-planned or for taxes, so purchases usually carry more information.
Which institutions hold GSM stock?
As of June 30, 2026, the largest Ferroglobe PLC (GSM) holders among the 13F filers tracked by SignalX were BlackRock ($24.2 million), Renaissance Technologies LLC ($8.4 million), Ameriprise Financial ($8.0 million), State Street Corp ($7.0 million), Dimensional Fund Advisors ($6.8 million). 13F-HR reports are filed up to 45 days after each quarter ends.
What are the latest GSM SEC filings?
Ferroglobe PLC (GSM) filed a Form 4 insider filing on September 24, 2026.
What is GSM's SEC CIK number?
Ferroglobe PLC (GSM)'s SEC Central Index Key (CIK) is 1639877. EDGAR lists every GSM filing under that number.
Ask anything about GSM
The research agent reads GSM's filings, financials, insider trades and 13F holders, then answers with sources.