% 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 HRNNF 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 | 29,70029,700 | $1M | — | — |
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 | 30K | 30K | 30K | 30K | 30K | 30K | $1M |
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 | |
|---|---|---|---|
| No filer increased its position this quarter. | |||
| 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 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 | 1 | 29,700 | — | $1M |
| 2025-Q4 | 1 | 29,700 | — | $1M |
| 2025-Q3 | 2 | 204,700 | — | $7M |
| 2025-Q2 | 1 | 29,700 | — | $1M |
| 2025-Q1 | 1 | 29,700 | — | $999,084 |
| 2024-Q4 | 1 | 29,700 | — | $914,720 |
| 2024-Q3 | 1 | 29,700 | — | $1M |
| 2024-Q2 | 2 | 159,600 | — | $5M |
| 2024-Q1 | 2 | 162,900 | — | $5M |
| 2023-Q4 | 2 | 180,800 | — | $5M |
| 2023-Q3 | 2 | 188,100 | — | $5M |
| 2023-Q2 | 2 | 188,100 | — | $5M |
| 2023-Q1 | 2 | 190,500 | — | $5M |
| 2022-Q4 | 2 | 190,500 | — | $5M |
| 2022-Q3 | 2 | 209,500 | — | $5M |
| 2022-Q2 | 2 | 218,400 | — | $6M |
| 2022-Q1 | 2 | 260,900 | — | $7M |
| 2021-Q4 | 4 | 372,268 | — | $10M |
| 2021-Q3 | 4 | 556,408 | — | $44M |
| 2021-Q2 | 4 | 645,258 | — | $15M |
| 2021-Q1 | 3 | 417,797 | — | $10M |
| 2020-Q4 | 3 | 375,524 | — | $8M |
| 2020-Q3 | 1 | 5,597 | — | $118,000 |
| 2020-Q2 | 1 | 6,797 | — | $127,000 |
| 2020-Q1 | 1 | 5,297 | — | $95,000 |
| 2019-Q4 | 1 | 5,297 | — | $102,000 |
| 2019-Q3 | 1 | 5,297 | — | $97,000 |
| 2019-Q2 | 1 | 7,137 | — | $124,000 |
| 2019-Q1 | 2 | 28,644 | — | $444,000 |
| 2018-Q4 | 2 | 28,644 | — | $424,000 |
| 2018-Q3 | 2 | 26,044 | — | $396,000 |
| 2018-Q2 | 2 | 889,230 | — | $14M |
| 2018-Q1 | 2 | 940,217 | — | $15M |
| 2017-Q4 | 2 | 1,316,889 | — | $24M |
| 2017-Q3 | 2 | 1,333,304 | — | $24M |
| 2017-Q2 | 2 | 1,242,363 | — | $22M |
| 2017-Q1 | 2 | 875,387 | — | $16M |
| 2016-Q4 | 2 | 71,286 | — | $2M |
| 2016-Q3 | 1 | 66,900 | — | $1M |
| 2016-Q2 | 1 | 66,900 | — | $1M |
| 2016-Q1 | 1 | 399,512 | — | $8M |
| 2015-Q4 | 1 | 409,261 | — | $7M |
