% 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 SKBSY in the served universe — the cohort is size-matched, and an unmatched percentile would compare a micro-cap register to a mega-cap one.
| # | Holder | Shares | Value | % of shares out | Δ QoQ |
|---|---|---|---|---|---|
| 1 | JOHN G ULLMAN & ASSOCIATES INC | 72,56672,566 | $2M | — | — |
| 2 | RHUMBLINE ADVISERS | 1,9831,983 | $54,709 | — | ADD 15% |
| 3 | Salomon & Ludwin, LLC | 887887 | $22,956 | — | ADD 99% |
| 4 | GAMMA Investing LLC | 1818 | $497 | — | — |
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 |
|---|---|---|---|---|---|---|---|
| JOHN G ULLMAN & ASSOCIATES INC | 75K | 74K | 74K | 73K | 73K | 73K | $2M |
| RHUMBLINE ADVISERS | — | — | 2K | 2K | 2K | 2K | $54,709 |
| Salomon & Ludwin, LLC | — | — | 15 | 445 | 445 | 887 | $22,956 |
| GAMMA Investing LLC | — | — | — | 18 | 18 | 18 | $497 |
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.
Holder count only — too few computable %-of-shares-outstanding quarters for a % pane. Line breaks are quarters with no 13F record, never interpolated.
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 | |
|---|---|---|---|
| Salomon & Ludwin, LLC | +442 | $12,195 | ADD |
| RHUMBLINE ADVISERS | +258 | $7,118 | ADD |
| Biggest sellers | Δ shares | Δ value | |
|---|---|---|---|
| YOUSIF CAPITAL MANAGEMENT, LLC | −7,200 | $198,648 | CLOSE |
| JOHN G ULLMAN & ASSOCIATES INC | −200 | $5,518 | — |
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 2026-03-31 close — rather than differencing two filings' own reported values, which would mix the quarter's price move into the trade figure.
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).
| Quarter | Holders | Shares held | % shares out | Value held |
|---|---|---|---|---|
| 2026-Q1 | 4 | 75,454 | — | $2M |
| 2025-Q4 | 5 | 82,154 | — | $2M |
| 2025-Q3 | 4 | 74,904 | — | $2M |
| 2025-Q2 | 4 | 75,728 | — | $2M |
| 2025-Q1 | 1 | 74,100 | — | $2M |
| 2024-Q4 | 1 | 74,900 | — | $2M |
| 2024-Q3 | 1 | 75,200 | — | $2M |
| 2024-Q2 | 1 | 78,300 | — | $1M |
| 2024-Q1 | 1 | 79,000 | — | $1M |
| 2023-Q4 | 1 | 81,800 | — | $1M |
| 2023-Q3 | 1 | 81,400 | — | $1M |
| 2023-Q2 | 1 | 82,500 | — | $1M |
| 2023-Q1 | 1 | 84,100 | — | $1M |
| 2022-Q4 | 1 | 86,300 | — | $1M |
| 2022-Q2 | 2 | 170 | — | $2,000 |
| 2022-Q1 | 4 | 242,287 | — | $5M |
| 2021-Q4 | 4 | 178,956 | — | $5M |
| 2021-Q3 | 3 | 61,666 | — | $2M |
| 2021-Q2 | 2 | 55,769 | — | $1M |
| 2021-Q1 | 1 | 3 | — | $0 |
| 2020-Q4 | 1 | 3 | — | $0 |
| 2018-Q3 | 1 | 10,182 | — | $200,000 |
| 2018-Q2 | 1 | 11,984 | — | $218,000 |
| 2018-Q1 | 1 | 15,906 | — | $324,000 |
| 2017-Q4 | 1 | 22,618 | — | $470,000 |
| 2017-Q3 | 1 | 23,503 | — | $543,000 |
| 2017-Q2 | 1 | 23,565 | — | $558,000 |
