Among active 13F managers last quarter, 2 opened and 1 reduced; the largest holder to move was Warberg Asset Management LLC (new position). Over the last 180 days, 2 insiders bought and none sold, a net +$600K in open-market trades.
Funds lean in and no leg opposes.
13 tracked 13F filers disclose a position in AMST as of the latest SEC 13F filings, a combined $524K in reported value. Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.
| # | Fund | Shares | Position value | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | Focus Partners Wealth | 166K | $305K | ▼−0.3% Reduced · −500 sh | Q1 2026 | |
| 2 | Geode Capital Management, LLC | 33K | $43K | ▼−39% Reduced · −21K sh | Q2 2026 | |
| 3 | State Street Corp | 32K | $42K | —Held | Q2 2026 | |
| 4 | Vanguard Capital Management LLC | 30K | $40K | —Held | Q2 2026 | |
| 5 | Warberg Asset Management LLC | 14K | $19K | ▲New +14K sh | Q2 2026 | |
| 6 | Vanguard Fiduciary Trust Co | 14K | $18K | —Held | Q2 2026 | |
| 7 | XTX Topco Ltd | 10K | $19K | ▲New +10K sh | Q1 2026 | |
| 8 | Osaic Holdings, Inc. | 10K | $18K | —Held | Q1 2026 | |
| 9 | JPMorgan Chase & Co | 6K | $11K | —Held | Q1 2026 | |
| 10 | UBS Group AG | 3K | $5K | ▲New +3K sh | Q1 2026 | |
| 11 | Tower Research Capital LLC (TRC) | 2K | $3K | ▼−14% Reduced · −283 sh | Q1 2026 | |
| 12 | Royal Bank Of Canada | 25 | $0 | ▲+32% Added · +6 sh | Q1 2026 | |
| 13 | Citigroup Inc | 1 | $2 | ▲New +1 sh | Q1 2026 |
Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.
Last quarter, 2 funds opened a new position in AMST, while 1 reduced. Based on 13F filings from active, signal-eligible managers (passive index funds and other mechanical holders are excluded from this count).
| Company | Co-held by | Their position there |
|---|---|---|
| Nextnav IncNN | 3 funds | $15.8M |
| Cornerstone Strategic InvestCLM | 3 funds | $14.1M |
| Post Holdings IncPOST | 3 funds | $7.9M |
| Amprius Technologies IncAMPX | 3 funds | $2.5M |
| USA Rare Earth IncUSAR | 3 funds | $2.4M |
| Stereotaxis IncSTXS | 3 funds | $2.0M |
| Optimum Communications Inc-AOPTU | 3 funds | $277K |
| Dakota Gold CorpDC | 3 funds | $226K |
| Rein Therapeutics IncRNTX | 3 funds | $148K |
| Invesco QQQ Trust Series 1QQQ | 2 funds | $140.4M |
| Direx Dail Semi Bu 3X Et-UsdSOXL | 2 funds | $116.7M |
| Apple IncAAPL | 2 funds | $115.9M |
Ranked by how many of AMST's tracked holders also hold each name. The last column is those co-holders' combined reported position in that name, not in AMST.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Apr 28, 2026 | Sastry Ann Marie | CHIEF EXECUTIVE OFFICER, Director | Buy (P) | 174K | $250K |
| Apr 28, 2026 | Parmer George | Director | Buy (P) | 244K | $350K |
| Jan 7, 2025 | Sastry Ann Marie | CHIEF EXECUTIVE OFFICER, Director | Buy (P) | 333K | $1000K |
| Jan 7, 2025 | Parmer George | Director | Buy (P) | 83K | $250K |
| Jan 7, 2025 | Omenn Gilbert S | Director | Buy (P) | 3K | $10K |
| Dec 20, 2023 | Sastry Ann Marie | CHIEF EXECUTIVE OFFICER, Director | Buy (P) | 10K | $19K |
| Mar 8, 2023 | Sastry Ann Marie | CHIEF EXECUTIVE OFFICER, Director | Buy (P) | 1K | $3K |
| Mar 3, 2023 | Sastry Ann Marie | CHIEF EXECUTIVE OFFICER, Director | Buy (P) | 2K | $6K |
| Mar 1, 2023 | Sastry Ann Marie | CHIEF EXECUTIVE OFFICER, Director | Buy (P) | 2K | $6K |
| Feb 24, 2023 | Sastry Ann Marie | CHIEF EXECUTIVE OFFICER, Director | Buy (P) | 2K | $5K |
| Dec 1, 2022 | Sastry Ann Marie | CHIEF EXECUTIVE OFFICER, Director | Buy (P) | 20K | $7K |
| Nov 28, 2022 | Sastry Ann Marie | CHIEF EXECUTIVE OFFICER, Director | Buy (P) | 20K | $5K |
Where institutional funds (13F), corporate insiders (Form 4) and US House members (STOCK Act) are buying or selling the same name in the same window. Green is buying, red is selling.
Insiders and Congress: last 180 days. Funds: latest 13F, top 100 holders incl. passive
| Source | Buying | Selling | Net |
|---|---|---|---|
13F funds Top 100 holders by value, passive included; the hero counts active managers only | 1 | 3 | – |
Insiders Form 4 open-market | 2 | 0 | +$600K |
US House STOCK Act trades | 0 | 0 | $0 |
Capital Rotation reports where institutional capital disclosed rotating, as of the latest public SEC 13F filings. It is data, not investment advice, a recommendation, or a prediction. Filings lag about 45 days and cover long US equity positions only. Past disclosed flows do not indicate future prices. Do your own research; consult a licensed advisor.
Connected entities for AMST
This stock page is the public Follow view. For one current, evidence-backed answer, use capital_change_brief through REST or MCP. It compares tracked 13F changes with qualifying Form 4 activity and cites the SEC evidence.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/stocks/AMST/capital-change-brief"
Use Arkolith's capital_change_brief for AMST. Tell me what changed, whether insider activity corroborates it, and cite the SEC evidence.
13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for AMST. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.