GROUP ONE TRADING, L.P. - AMTECH SYS INC ownership

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AMTECH SYS INC's ticker is and the CUSIP is 32332954. A total of 1 filers reported holding AMTECH SYS INC in Q4 2013. The put-call ratio across all filers is - and the average weighting 0.0%.

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Quarter-by-quarter ownership
GROUP ONE TRADING, L.P. ownership history of AMTECH SYS INC
ValueSharesWeighting
Q1 2014$12,000
+71.4%
1,0000.0%0.00%–
Q4 2013$7,0000.0%1,0000.0%0.00%–
Q3 2013$7,000–1,000–0.00%–
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Other shareholders
AMTECH SYS INC shareholders Q4 2013
NameSharesValueWeighting ↓
GROUP ONE TRADING, L.P. 1,000$7,0000.00%
View complete list of AMTECH SYS INC shareholders