Mark Jeffrey DeLong
CIK 1856078 · Chief Business & Strat Officer · last filed 2026-05-14
"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
$0
Companies
1
Total Filings
57
Lifetime Open-Market Net
-$4.59M
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 |
|---|---|---|---|---|---|---|---|
| Apellis Pharmaceuticals, Inc. (APLS) Delisted | Chief Business & Strat Officer | 0 | $41.03 | $0 | -$4.59M | 42 | 2026-05-14 |
Recent Filings · Page 5 of 6
57 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 |
|---|---|---|---|---|---|
| 2022-08-18 | Apellis Pharmaceuticals, Inc. (APLS) Delisted | Mixed | — | -$269.9K | EDGAR |
| 2022-08-12 | Apellis Pharmaceuticals, Inc. (APLS) Delisted | Mixed | — | -$257.4K | EDGAR |
| 2022-08-09 | Apellis Pharmaceuticals, Inc. (APLS) Delisted | Mixed | — | -$244.9K | EDGAR |
| 2022-08-08 | Apellis Pharmaceuticals, Inc. (APLS) Delisted | Mixed | — | -$452.3K | EDGAR |
| 2022-07-28 | Apellis Pharmaceuticals, Inc. (APLS) Delisted | Mixed | — | -$207.4K | EDGAR |
| 2022-07-21 | Apellis Pharmaceuticals, Inc. (APLS) Delisted | Mixed | — | -$204.5K | EDGAR |
| 2022-06-21 | Apellis Pharmaceuticals, Inc. (APLS) Delisted | Mixed | — | -$279.3K | EDGAR |
| 2022-04-22 | Apellis Pharmaceuticals, Inc. (APLS) Delisted | Mixed | — | -$259.1K | EDGAR |
| 2022-02-14 | Apellis Pharmaceuticals, Inc. (APLS) Delisted | Mixed | +4,630 | -$12.8K | EDGAR |
| 2022-02-07 | Apellis Pharmaceuticals, Inc. (APLS) Delisted | Grant (A) | +13,913 | $0 | 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.