GAMCO Investors (Gabelli): MKSI position timeline

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

GAMCO Investors (Gabelli) held 32,715 MKSI 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 32,715 shares
Change vs previous 13F -20,438 shares
0.05% of the 13F portfolio, value $14,551,632.
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: 715 shares
- GABELLI & Co INVESTMENT ADVISERS, INC.: 0 shares
- GABELLI FUNDS LLC: 32,000 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2026-03-31
13F 53,153 shares
Change vs previous 13F +22 shares
0.05% of the 13F portfolio, value $12,215,091.
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: 3,875 shares
- GABELLI & Co INVESTMENT ADVISERS, INC.: 2,220 shares
- GABELLI FUNDS LLC: 47,058 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2025-12-31
13F 53,131 shares
Change vs previous 13F -3,300 shares
0.03% of the 13F portfolio, value $8,490,334.
13F-HR 0001140361-26-003893 filed by GABELLI FUNDS LLC
Filed 2026-02-05 (acceptance time not in the bulk data set), ingested 2026-10-07 03:01:36 UTC
- GAMCO INVESTORS, INC. ET AL: 3,885 shares
- GABELLI & Co INVESTMENT ADVISERS, INC.: 2,220 shares
- GABELLI FUNDS LLC: 47,026 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2025-09-30
13F 56,431 shares
Change vs previous 13F +400 shares
0.03% of the 13F portfolio, value $6,984,464.
13F-HR 0001140361-25-041671 filed by GABELLI FUNDS LLC
Filed 2025-11-12 (acceptance time not in the bulk data set), ingested 2026-10-07 03:02:25 UTC
- GAMCO INVESTORS, INC. ET AL: 7,885 shares
- GABELLI & Co INVESTMENT ADVISERS, INC.: 2,220 shares
- GABELLI FUNDS LLC: 46,326 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2025-06-30
13F 56,031 shares
Change vs previous 13F +10,100 shares
0.02% of the 13F portfolio, value $5,567,240.
13F-HR 0001140361-25-030816 filed by GABELLI FUNDS LLC
Filed 2025-08-13 (acceptance time not in the bulk data set), ingested 2026-10-07 18:23:11 UTC
- GAMCO INVESTORS, INC. ET AL: 8,485 shares
- GABELLI & Co INVESTMENT ADVISERS, INC.: 2,220 shares
- GABELLI FUNDS LLC: 45,326 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2025-03-31
13F 45,931 shares
Change vs previous 13F +7,565 shares
0.02% of the 13F portfolio, value $3,681,370.
13F-HR 0001140361-25-018974 filed by GABELLI FUNDS LLC
Filed 2025-05-14 (acceptance time not in the bulk data set), ingested 2026-10-07 18:25:06 UTC
- GAMCO INVESTORS, INC. ET AL: 8,545 shares
- GABELLI & Co INVESTMENT ADVISERS, INC.: 0 shares
- GABELLI FUNDS LLC: 37,386 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2024-12-31
13F 38,366 shares
Change vs previous 13F +1,100 shares
0.02% of the 13F portfolio, value $4,005,027.
13F-HR 0001140361-25-004328 filed by GABELLI FUNDS LLC
Filed 2025-02-13 (acceptance time not in the bulk data set), ingested 2026-10-07 18:25:55 UTC
- GAMCO INVESTORS, INC. ET AL: 4,060 shares
- GABELLI & Co INVESTMENT ADVISERS, INC.: 2,220 shares
- GABELLI FUNDS LLC: 32,086 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2024-09-30
13F 37,266 shares
Change vs previous 13F not available
0.02% of the 13F portfolio, value $4,051,187.
13F-HR 0001140361-24-046503 filed by GABELLI FUNDS LLC
Filed 2024-11-13 (acceptance time not in the bulk data set), ingested 2026-10-07 18:26:56 UTC
- GAMCO INVESTORS, INC. ET AL: 2,960 shares
- GABELLI & Co INVESTMENT ADVISERS, INC.: 2,220 shares
- GABELLI FUNDS LLC: 32,086 shares
Acceptance time not in the bulk data set (spec §4.2).