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Form SC 13G/A - Statement of acquisition of beneficial ownership by individuals: [Amend]
SEC Accession No. 0001050442-22-000005
Filing Date
2022-02-15
Accepted
2022-02-14 17:34:29
Documents
1

Document Format Files

Seq Description Document Type Size
1 13G/A GEOS 2021-12-31 GEOS_20211231.txt SC 13G/A 8482
  Complete submission text file 0001050442-22-000005.txt   10060
Mailing Address 7007 PINEMONT DR. HOUSTON TX 77040
Business Address 7007 PINEMONT DR. HOUSTON TX 77040 7139864444
GEOSPACE TECHNOLOGIES CORP (Subject) CIK: 0001001115 (see all company filings)

IRS No.: 760447780 | State of Incorp.: TX | Fiscal Year End: 0930
Type: SC 13G/A | Act: 34 | File No.: 005-52075 | Film No.: 22635322
SIC: 3829 Measuring & Controlling Devices, NEC

Mailing Address 150 S. FIFTH ST SUITE 2550 MINNEAPOLIS MN 55402
Business Address 150 S 5TH ST SUITE 2550 MINNEAPOLIS MN 55402 6123174100
DISCIPLINED GROWTH INVESTORS INC /MN (Filed by) CIK: 0001050442 (see all company filings)

IRS No.: 411901233 | State of Incorp.: MN | Fiscal Year End: 1231
Type: SC 13G/A