7 institutions reported holding $93.3M of AMERICAN TOWER CORP (AMT-PA) in SEC 13F filings for 2026-03-31. Largest institutional holders: IMC-Chicago, LLC ($53.0M), SIMPLEX TRADING, LLC ($15.7M), GROUP ONE TRADING LLC ($15.2M), Maven Securities LTD ($9.3M), SG Americas Securities, LLC ($18,000). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | IMC-Chicago, LLC | $53.0M | 307,300 | Added |
| 2 | SIMPLEX TRADING, LLC | $15.7M | 90,700 | Added |
| 3 | GROUP ONE TRADING LLC | $15.2M | 88,200 | Trimmed |
| 4 | Maven Securities LTD | $9.3M | 54,100 | Added |
| 5 | SG Americas Securities, LLC | $18,000 | 10,100 | Hold |
| 6 | JPMORGAN CHASE & CO | $0 | 0 | Exited |
| 7 | THURSTON, SPRINGER, MILLER, HERD & TITAK, INC. | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-03-31