Derek M Meisner
CIK 1752461 · Chief Legal Officer & Corp Sec · last filed 2026-03-10
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
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Disclosed Exposure
$568.2K
Companies
3
Total Filings
43
Lifetime Open-Market Net
-$477.3K
Holdings By Company
Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| ABOS | Chief Legal Officer & Corp Sec | 173,999 | $3.15 | $548.1K | -$305.9K | 13 | 2026-03-10 |
| XFOR | Chief Legal Officer | 4,838 | $4.16 | $20.1K | -$171.4K | 12 | 2022-08-19 |
| GENOCEA BIOSCIENCES, INC. (GNCA) Delisted | SENIOR VP AND GENERAL COUNSEL | — | $0.00 | — | $0 | 2 | 2019-02-11 |
Recent Filings · Page 2 of 5
43 filingsInsider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-01-21 | ABOS | Notice (144) | −2,247 | -$4.1K | EDGAR |
| 2026-01-21 | ABOS | Grant (A) | +99,133 | $0 | EDGAR |
| 2026-01-12 | ABOS | Notice (144) | −8,548 | -$14.7K | EDGAR |
| 2026-01-12 | ABOS | Sell (S) | −50,659 | -$91.1K | EDGAR |
| 2026-01-09 | ABOS | Notice (144) | −5,200 | -$9.2K | EDGAR |
| 2026-01-08 | ABOS | Notice (144) | −36,911 | -$67.2K | EDGAR |
| 2026-01-07 | ABOS | Notice (144) | −11,770 | -$23.4K | EDGAR |
| 2026-01-07 | ABOS | Sell (S) | −26,668 | -$52.7K | EDGAR |
| 2026-01-06 | ABOS | Notice (144) | −10,898 | -$21.4K | EDGAR |
| 2026-01-05 | ABOS | Notice (144) | −4,000 | -$7.8K | EDGAR |
Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.