Birchtech
Supplies activated-carbon systems for utility mercury control and water treatment.
$1.22
After-hours close+0.02 (+1.67%)
At close$1.20(−3.23%)
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Breakdown13F · Form 4
Institutions 12.52%Insiders —
Shares outstanding 26.31M · Float 14.72M · 56.0% free float
Institutions13F, as of Mar 31, 2026
23 holders · 3.29M shares · 21 new positions · 22 increased · 1 reduced · 0 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| Heartland Advisors Inc | 1.00M | 3.80% | +1.00Mnew | May 6, 2026 |
| Chapin Davis, Inc. | 686.7K | 2.61% | +686.7Knew | Apr 21, 2026 |
| Ancora Advisors, LLC | 428.7K | 1.63% | +375.8K | May 15, 2026 |
| Aristides Capital LLC | 425.0K | 1.62% | +425.0Knew | May 14, 2026 |
| White Pine Capital LLC | 351.9K | 1.34% | +351.9Knew | Aug 5, 2026 |
| Sigma Planning Corp | 52.4K | 0.20% | +52.4Knew | May 4, 2026 |
| Ars Investment Partners, LLC | 51.1K | 0.19% | +51.1Knew | Apr 16, 2026 |
| Citadel Advisors LLC | 51.0K | 0.19% | +51.0Knew | May 15, 2026 |
Beneficial owners13D/G · 5% or more, as filed
No 13D/G filer at 5% or more on record.
InsidersForm 4
Latest trades
Nothing filed in the last 12 months.
CongressHouse and Senate disclosures
Not reported.