13 tracked 13F filers disclose a position in AMBR as of the latest SEC 13F filings, a combined $46.5M 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 | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | Paradigm Operations LP | $46.0M | 30.9M | ▲New +30.9M sh | Q2 2026 | |
| 2 | Pantera Capital Partners LP | $226K | 96K | —Held | Q1 2026 | |
| 3 | SmartHarvest Portfolios, LLC | $80K | 54K | ▲+68% Added · +22K sh | Q2 2026 | |
| 4 | XTX Topco Ltd | $65K | 27K | ▼−34% Reduced · −14K sh | Q1 2026 | |
| 5 | UBS Group AG | $63K | 27K | ▲+396% Added · +21K sh | Q1 2026 | |
| 6 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $28K | 12K | ▼−57% Reduced · −16K sh | Q1 2026 | |
| 7 | TWO SIGMA INVESTMENTS, LP | $27K | 12K | —Held | Q1 2026 | |
| 8 | BlackRock, Inc. | $4K | 2K | ▼−41% Reduced · −1K sh | Q1 2026 | |
| 9 | RHUMBLINE ADVISERS | $2K | 1K | —Held | Q1 2026 | |
| 10 | SIMPLEX TRADING, LLC | $814 | 345 | ▼−98% Reduced · −19K sh | Q1 2026 | |
| 11 | SBI Securities Co., Ltd. | $365 | 245 | ▲+5.2% Added · +12 sh | Q2 2026 | |
| 12 | MORGAN STANLEY | $172 | 73 | ▼−100% Reduced · −26K sh | Q1 2026 | |
| 13 | Caitong International Asset Management Co., Ltd | $4 | 3 | ▲+50% Added · +1 sh | Q2 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, 1 fund opened a new position in AMBR and 3 added to an existing one, while 1 reduced and 0 exited entirely — 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 | Combined value |
|---|---|---|
| ROBINHOOD MARKETS INC - AHOOD | 7 funds | $756.4M |
| NVIDIA CORPNVDA | 6 funds | $5.7B |
| AMAZON.COM INCAMZN | 6 funds | $3.1B |
| APPLE INCAAPL | 6 funds | $3.0B |
| MICRON TECHNOLOGY INCMU | 6 funds | $2.5B |
| ALPHABET INC-CL AGOOGL | 6 funds | $2.2B |
| TESLA INCTSLA | 6 funds | $2.0B |
| JPMORGAN CHASE & COJPM | 6 funds | $1.7B |
| COSTCO WHOLESALE CORPCOST | 6 funds | $1.4B |
| BERKSHIRE HATHAWAY INC-CL BBRK/B | 6 funds | $1.4B |
| LOCKHEED MARTIN CORPLMT | 6 funds | $1.3B |
| UNITEDHEALTH GROUP INCUNH | 6 funds | $895.1M |
Ranked by how many of AMBR's institutional holders also hold each name, a cross-fund conviction signal.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Jun 13, 2019 | Pieri Nathan | Chief Product Officer | Sell (S) | 10K | $128K |
| May 21, 2019 | Pieri Nathan | Chief Product Officer | Sell (S) | 121K | $1.6M |
| May 14, 2019 | Preuninger James W | Chief Executive Officer, Director | Sell (S) | 70K | $908K |
| May 14, 2019 | Conway Thomas E | Chief Financial Officer | Sell (S) | 247K | $3.2M |
| May 14, 2019 | Pieri Nathan | Chief Product Officer | Sell (S) | 108K | $1.4M |
| May 14, 2019 | Pieri Nathan | Chief Product Officer | Sell (S) | 6K | $71K |
| May 13, 2019 | Pieri Nathan | Chief Product Officer | Sell (S) | 2K | $20K |
| Mar 11, 2019 | Conway Thomas E | Chief Financial Officer | Sell (S) | 20K | $174K |
| Feb 20, 2019 | Preuninger James W | Chief Executive Officer, Director | Sell (S) | 42K | $395K |
| Nov 28, 2018 | Conway Thomas E | Chief Financial Officer | Sell (S) | 3K | $28K |
| Nov 28, 2018 | Preuninger James W | Chief Executive Officer, Director | Sell (S) | 10K | $90K |
| Nov 27, 2018 | Preuninger James W | Chief Executive Officer, Director | Sell (S) | 10K | $90K |
| Class | 13F holders | Value held |
|---|---|---|
| AMBRthis pageSPON ADS NEW | 13 funds | $46.5M |
| ICLKGBPADR | 1 funds | $1K |
Same issuer, multiple share classes. The consensus leaderboards count this company once across all classes; this is the per-class detail.
Connected entities for AMBR
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/AMBR/capital-change-brief"
Use Arkolith's capital_change_brief for AMBR. 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 AMBR. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.