GAMCO Investors (Gabelli): SEM position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of GAMCO Investors (Gabelli) on SEM, newest first. How the timeline and the estimate are built.

GAMCO Investors (Gabelli) held 286,750 SEM shares at 2026-06-30 per its 13F-HR filed 2026-08-12.

the latest 13F is the newest step

period ended2026-06-30
13F 286,750 shares
Change vs previous 13F -48,900 shares
0.02% of the 13F portfolio, value $4,734,243.
13F-HR 0001140361-26-032509 filed by GABELLI FUNDS LLC
Filed 2026-08-12 (acceptance time not in the bulk data set), ingested 2026-10-06 09:57:27 UTC
- GAMCO INVESTORS, INC. ET AL: 22,000 shares
- GABELLI & Co INVESTMENT ADVISERS, INC.: 119,550 shares
- GABELLI FUNDS LLC: 145,200 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2026-03-31
13F 335,650 shares
Change vs previous 13F not available
0.02% of the 13F portfolio, value $5,467,739.
13F-HR 0001140361-26-021337 filed by GABELLI FUNDS LLC
Filed 2026-05-14 (acceptance time not in the bulk data set), ingested 2026-10-06 09:58:43 UTC
- GAMCO INVESTORS, INC. ET AL: 22,000 shares
- GABELLI & Co INVESTMENT ADVISERS, INC.: 140,650 shares
- GABELLI FUNDS LLC: 173,000 shares
Acceptance time not in the bulk data set (spec §4.2).