% of shares outstanding not shown: no SEC cover-page share count falls within 120 days of the 2026-Q1 quarter end, so any percentage would rest on a count that cannot speak for this quarter. Holder share counts are shown as filed.
Crowding percentile withheld — no market cap for GMTL in the served universe — the cohort is size-matched, and an unmatched percentile would compare a micro-cap register to a mega-cap one.
Rows rank by the value each filer reported — 13F filers price their own positions, so a holder with fewer shares can rank just above one with more.
| Holder | 2024-Q4 | 2025-Q1 | 2025-Q2 | 2025-Q3 | 2025-Q4 | 2026-Q1 | Latest value |
|---|---|---|---|---|---|---|---|
| DONALD SMITH & CO., INC. | — | — | — | — | — | 1.5M | $26M |
| T. Rowe Price Investment Management, Inc. | — | — | — | — | — | 1.1M | $19M |
| Driehaus Capital Management LLC | — | — | — | — | — | 555K | $10M |
| Aventail Capital Group, LP | — | — | — | — | — | 431K | $8M |
| Potrero Capital Research LLC | — | — | — | — | — | 360K | $6M |
| PICTON MAHONEY ASSET MANAGEMENT | — | — | — | — | — | 309K | $5M |
| Diametric Capital, LP | — | — | — | — | — | 158K | $3M |
| TEACHER RETIREMENT SYSTEM OF TEXAS | — | — | — | — | — | 150K | $3M |
| JANE STREET GROUP, LLC | — | — | — | — | — | 107K | $2M |
| ArrowMark Colorado Holdings LLC | — | — | — | — | — | 96K | $2M |
| CITADEL ADVISORS LLC | — | — | — | — | — | 78K | $1M |
| Mercuria Capital Strategies, LLC | — | — | — | — | — | 65K | $1M |
| MILLENNIUM MANAGEMENT LLC | — | — | — | — | — | 53K | $921,336 |
| HRT FINANCIAL LP | — | — | — | — | — | 43K | $752,000 |
| Monaco Asset Management SAM | — | — | — | — | — | 42K | $733,164 |
Shares reported each quarter by the largest current holders. Green = added vs the prior filing, red = trimmed, grey = roughly held; a dash is a quarter with no 13F on file (a gap is skipped, not read as an exit). 13F is filed up to 45 days after quarter-end. Up to 40 quarters (10 years) available — use the selector above.
Short interest has its own tab now — open SI →
Source: SEC Form 13F — every institution manager (≥ $100M in 13F securities) reporting a long US-listed position, across ~10,250 filers over 10 years of history. 13F is long-only, US-listed, filed up to 45 days after quarter-end.
| Biggest buyers | Δ shares | Δ value | |
|---|---|---|---|
| DONALD SMITH & CO., INC. | +1,500,556 | — | OPEN |
| T. Rowe Price Investment Management, Inc. | +1,111,159 | — | OPEN |
| Driehaus Capital Management LLC | +555,251 | — | OPEN |
| Aventail Capital Group, LP | +430,778 | — | OPEN |
| Potrero Capital Research LLC | +359,507 | — | OPEN |
| Biggest sellers | Δ shares | Δ value | |
|---|---|---|---|
| No filer reduced its position this quarter. | |||
The 2025-Q4 register is as-filed in ITS OWN share basis; every count below was rebased into the 2026-Q1 basis (no split in between, factor 1). Dollar figures value the SHARE delta at one price — the quarter-end close — rather than differencing two filings' own reported values, which would mix the quarter's price move into the trade figure. No licensed quarter-end close is stored for this line, so the dollar columns are withheld; share counts stand.
13Fs disclose LONG US-listed positions only — shorts, most derivatives, bonds and non-US listings are invisible here, and a filer's quarter-over-quarter change is not necessarily a trade (index rebalances, in-kind transfers and entity successions all read as flow).
