% 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 BPIRX 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 | Broderick Brian C | 593,224593,224 | $8M | — | — |
| 2 | Hemenway Trust Co LLC | 256,697256,697 | $4M | — | ADD 7% |
| 3 | SOMERVILLE KURT F | 26,89126,891 | $374,870 | — | — |
| 4 | Dempze Nancy E | 12,96212,962 | $180,688 | — | — |
| 5 | Financial Gravity Asset Management, Inc. | 1,1451,145 | $15,957 | — | NEW |
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 |
|---|---|---|---|---|---|---|---|
| Broderick Brian C | 536K | 536K | 536K | 536K | 593K | 593K | $8M |
| Hemenway Trust Co LLC | 194K | 322K | 342K | 241K | 241K | 257K | $4M |
| SOMERVILLE KURT F | 27K | 27K | 27K | 27K | 27K | 27K | $374,870 |
| Dempze Nancy E | 13K | 13K | 13K | 13K | 13K | 13K | $180,688 |
| Financial Gravity Asset Management, Inc. | — | 1K | — | — | — | 1K | $15,957 |
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 | |
|---|---|---|---|
| Hemenway Trust Co LLC | +16,098 | $224,406 | ADD |
| Financial Gravity Asset Management, Inc. | +1,145 | $15,961 | 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 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 | 5 | 890,919 | — | $12M |
| 2025-Q4 | 4 | 873,676 | — | $12M |
| 2025-Q3 | 4 | 816,718 | — | $12M |
| 2025-Q2 | 5 | 919,249 | — | $13M |
| 2025-Q1 | 5 | 898,890 | — | $12M |
| 2024-Q4 | 5 | 771,195 | — | $10M |
| 2024-Q3 | 4 | 636,557 | — | $10M |
| 2024-Q2 | 4 | 619,386 | — | $9M |
| 2024-Q1 | 4 | 619,386 | — | $9M |
| 2023-Q4 | 3 | 606,424 | — | $8M |
| 2023-Q3 | 4 | 570,026 | — | $8M |
| 2023-Q2 | 4 | 570,026 | — | $8M |
| 2023-Q1 | 4 | 570,026 | — | $8M |
| 2022-Q4 | 4 | 570,026 | — | $8M |
| 2022-Q3 | 4 | 510,598 | — | $8M |
| 2022-Q2 | 4 | 510,598 | — | $8M |
| 2022-Q1 | 4 | 510,598 | — | $8M |
| 2021-Q4 | 4 | 510,598 | — | $8M |
| 2021-Q3 | 4 | 469,970 | — | $8M |
| 2021-Q2 | 4 | 469,970 | — | $8M |
| 2021-Q1 | 3 | 426,815 | — | $7M |
| 2020-Q4 | 4 | 440,099 | — | $6M |
| 2020-Q3 | 3 | 429,507 | — | $6M |
| 2020-Q2 | 3 | 429,507 | — | $6M |
| 2020-Q1 | 4 | 446,794 | — | $6M |
| 2019-Q4 | 4 | 441,359 | — | $7M |
| 2019-Q3 | 4 | 434,911 | — | $7M |
| 2019-Q2 | 4 | 402,359 | — | $6M |
| 2019-Q1 | 3 | 383,404 | — | $6M |
| 2018-Q4 | 4 | 280,673 | — | $4M |
| 2018-Q3 | 4 | 370,359 | — | $6M |
| 2018-Q2 | 4 | 367,381 | — | $6M |
| 2018-Q1 | 3 | 325,866 | — | $6M |
| 2017-Q4 | 3 | 325,866 | — | $6M |
| 2017-Q3 | 4 | 386,590 | — | $6M |
| 2017-Q2 | 5 | 395,862 | — | $6M |
| 2017-Q1 | 3 | 155,860 | — | $2M |
| 2016-Q4 | 4 | 284,924 | — | $4M |
| 2016-Q3 | 4 | 282,283 | — | $4M |
| 2016-Q2 | 5 | 267,751 | — | $4M |
| 2016-Q1 | 5 | 284,916 | — | $4M |
| 2015-Q4 | 7 | 367,369 | — | $5M |
| 2015-Q3 | 5 | 319,392 | — | $5M |
| 2015-Q2 | 5 | 187,021 | — | $3M |
| 2015-Q1 | 4 | 472,987 | — | $7M |
| 2014-Q4 | 3 | 371,485 | — | $6M |
| 2014-Q3 | 2 | 397,902 | — | $6M |
| 2014-Q2 | 1 | 104,885 | — | $2M |
| 2014-Q1 | 1 | 104,885 | — | $2M |
| 2013-Q4 | 1 | 97,956 | — | $1M |
| 2013-Q3 | 1 | 97,578 | — | $1M |
| 2013-Q2 | 1 | 97,578 | — | $1M |
| 2013-Q1 | 1 | 97,578 | — | $1M |
