5 institutions reported holding $329.0M of ISHARES TR (AMPS1) in SEC 13F filings for 2026-03-31. Largest institutional holders: JPMORGAN CHASE & CO ($219.8M), IMC-Chicago, LLC ($39.1M), GROUP ONE TRADING LLC ($38.5M), SIMPLEX TRADING, LLC ($31.4M), Marathon Trading Investment Management LLC ($140,520). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | JPMORGAN CHASE & CO | $219.8M | 4.8M | Added |
| 2 | IMC-Chicago, LLC | $39.1M | 792,400 | Added |
| 3 | GROUP ONE TRADING LLC | $38.5M | 803,200 | Added |
| 4 | SIMPLEX TRADING, LLC | $31.4M | 613,200 | Trimmed |
| 5 | Marathon Trading Investment Management LLC | $140,520 | 3,000 | New |
Source: SEC Form 13F filings · as of 2026-03-31