Walthausen & Co., LLC: OSIS position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of Walthausen & Co., LLC on OSIS, newest first. How the timeline and the estimate are built.

Walthausen & Co., LLC held 15,530 OSIS shares at 2022-09-30 per its 13F-HR/A filed 2022-11-14.

the latest 13F is the newest step

period ended2022-09-30
13F/A 15,530 shares
Change vs previous 13F -9,119 shares
0.93% of the 13F portfolio, value $1,119,000.
13F-HR/A 0001483339-22-000006 filed by Walthausen & Co., LLC
Filed 2022-11-14 (acceptance time not in the bulk data set), ingested 2026-10-07 18:34:10 UTC
Acceptance time not in the bulk data set (spec §4.2).
period ended2022-06-30
13F 24,649 shares
Change vs previous 13F -3,430 shares
0.94% of the 13F portfolio, value $2,106,000.
13F-HR 0001483339-22-000004 filed by Walthausen & Co., LLC
Filed 2022-08-12 (acceptance time not in the bulk data set), ingested 2026-10-07 18:35:03 UTC
Acceptance time not in the bulk data set (spec §4.2).
period ended2022-03-31
13F 28,079 shares
Change vs previous 13F +1,440 shares
0.67% of the 13F portfolio, value $2,390,000.
13F-HR 0001483339-22-000003 filed by Walthausen & Co., LLC
Filed 2022-05-11 (acceptance time not in the bulk data set), ingested 2026-10-07 18:35:57 UTC
Acceptance time not in the bulk data set (spec §4.2).
period ended2021-12-31
13F 26,639 shares
Change vs previous 13F -5,070 shares
0.65% of the 13F portfolio, value $2,483,000.
13F-HR 0001483339-22-000002 filed by Walthausen & Co., LLC
Filed 2022-02-11 (acceptance time not in the bulk data set), ingested 2026-10-07 18:36:54 UTC
Acceptance time not in the bulk data set (spec §4.2).
period ended2021-09-30
13F 31,709 shares
Change vs previous 13F +2,539 shares
0.76% of the 13F portfolio, value $3,006,000.
13F-HR 0001483339-21-000006 filed by Walthausen & Co., LLC
Filed 2021-11-12 (acceptance time not in the bulk data set), ingested 2026-10-07 18:37:51 UTC
Acceptance time not in the bulk data set (spec §4.2).
period ended2021-06-30
13F/A 29,170 shares
Change vs previous 13F +2,860 shares
0.65% of the 13F portfolio, value $2,965,000.
13F-HR/A 0001483339-21-000005 filed by Walthausen & Co., LLC
Filed 2021-08-13 (acceptance time not in the bulk data set), ingested 2026-10-07 18:38:33 UTC
Acceptance time not in the bulk data set (spec §4.2).
period ended2021-03-31
13F 26,310 shares
Change vs previous 13F +6,790 shares
0.53% of the 13F portfolio, value $2,528,000.
13F-HR 0001483339-21-000003 filed by Walthausen & Co., LLC
Filed 2021-05-13 (acceptance time not in the bulk data set), ingested 2026-10-07 18:39:37 UTC
Acceptance time not in the bulk data set (spec §4.2).
period ended2020-12-31
13F 19,520 shares
Change vs previous 13F not available
0.5% of the 13F portfolio, value $1,820,000.
13F-HR 0001483339-21-000002 filed by Walthausen & Co., LLC
Filed 2021-02-12 (acceptance time not in the bulk data set), ingested 2026-10-07 18:42:52 UTC
Acceptance time not in the bulk data set (spec §4.2).