MAETZOLD DEREK J
Director · Officer · CSTL
As of 2026-09-16, MAETZOLD DEREK J has 294 Form 4 transactions on record across 1 company — 174 in the trailing 12 months.
Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.
Pattern in the record: open-market sales filed in September in multiple years since 2025 — a recurring calendar cadence, more consistent with scheduled activity than a one-off decision.
Reconstructed holdings
Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.
Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.
Trades by company
Filing ledger
| Date | Company | Action | Shares @ price | Value | Ownership Δ | Owned after | Filing |
|---|---|---|---|---|---|---|---|
| 2026-09-11 | CSTL | Sale | 8,361 @ $32.00 | $268K | −27.8% of holding | 21,702 | Form 4 |
| 2026-09-11 | CSTL | Sale | 3,124 @ $32.00 | $100K | −17.7% of holding | 14,517 | Form 4 |
| 2026-09-11 | CSTL | Sale | 2,656 @ $32.00 | $85K | −17.7% of holding | 12,339 | Form 4 |
| 2026-09-11 | CSTL | Sale | 223 @ $32.78 | $7K | −1.0% of holding | 21,479 | Form 4 |
| 2026-09-11 | CSTL | Sale | 83 @ $32.78 | $3K | −0.6% of holding | 14,434 | Form 4 |
| 2026-09-11 | CSTL | Sale | 71 @ $32.78 | $2K | −0.6% of holding | 12,268 | Form 4 |
| 2026-08-28 | CSTL | Sale | 11,472 @ $33.14 | $380K | −33.8% of holding | 22,435 | Form 4 |
| 2026-08-28 | CSTL | Sale | 2,505 @ $33.14 | $83K | −12.3% of holding | 17,850 | Form 4 |
| 2026-08-28 | CSTL | Sale | 2,129 @ $33.14 | $71K | −12.3% of holding | 15,172 | Form 4 |
| 2026-08-28 | CSTL | Sale | 956 @ $33.88 | $32K | −4.3% of holding | 21,479 | Form 4 |
| 2026-08-28 | CSTL | Sale | 257 @ $33.14 | $9K | −2.2% of holding | 11,277 | Form 4 |
| 2026-08-28 | CSTL | Sale | 209 @ $33.88 | $7K | −1.2% of holding | 17,641 | Form 4 |
| 2026-08-28 | CSTL | Sale | 177 @ $33.88 | $6K | −1.2% of holding | 14,995 | Form 4 |
| 2026-08-28 | CSTL | Sale | 21 @ $33.88 | $711 | −0.2% of holding | 11,256 | Form 4 |
| 2026-08-14 | CSTL | Sale | 2,714 @ $30.02 | $81K | −11.8% of holding | 20,355 | Form 4 |
| 2026-08-14 | CSTL | Sale | 2,306 @ $30.02 | $69K | −11.8% of holding | 17,301 | Form 4 |
| 2026-08-14 | CSTL | Sale | 1,100 @ $30.02 | $33K | −4.9% of holding | 21,479 | Form 4 |
| 2026-08-14 | CSTL | Sale | 278 @ $30.02 | $8K | −2.4% of holding | 11,534 | Form 4 |
| 2026-08-05 | CSTL | Sale | 2,546 @ $30.68 | $78K | −10.6% of holding | 21,479 | Form 4 |
| 2026-08-05 | CSTL | Sale | 556 @ $30.68 | $17K | −2.4% of holding | 23,069 | Form 4 |
| 2026-08-05 | CSTL | Sale | 473 @ $30.68 | $15K | −2.4% of holding | 19,607 | Form 4 |
| 2026-08-04 | CSTL | Sale | 11,935 @ $31.34 | $374K | −35.7% of holding | 21,479 | Form 4 |
| 2026-08-04 | CSTL | Sale | 8,421 @ $30.79 | $259K | −20.1% of holding | 33,414 | Form 4 |
| 2026-08-04 | CSTL | Sale | 4,782 @ $31.34 | $150K | −16.8% of holding | 23,625 | Form 4 |
| 2026-08-04 | CSTL | Sale | 4,063 @ $31.34 | $127K | −16.8% of holding | 20,080 | Form 4 |
| 2026-08-04 | CSTL | Sale | 3,374 @ $30.79 | $104K | −10.6% of holding | 28,407 | Form 4 |
| 2026-08-04 | CSTL | Sale | 2,866 @ $30.79 | $88K | −10.6% of holding | 24,143 | Form 4 |
| 2026-08-03 | CSTL | Sale | 10,664 @ $30.35 | $324K | −33.2% of holding | 21,479 | Form 4 |
| 2026-08-03 | CSTL | Sale | 4,232 @ $30.35 | $128K | −11.8% of holding | 31,781 | Form 4 |
| 2026-08-03 | CSTL | Sale | 3,597 @ $30.35 | $109K | −11.8% of holding | 27,009 | Form 4 |
| 2026-07-31 | CSTL | Sale | 6,480 @ $30.15 | $195K | −23.2% of holding | 21,479 | Form 4 |
| 2026-07-31 | CSTL | Sale | 1,983 @ $30.15 | $60K | −5.2% of holding | 36,013 | Form 4 |
| 2026-07-31 | CSTL | Sale | 1,690 @ $30.15 | $51K | −5.2% of holding | 30,606 | Form 4 |
| 2026-07-27 | CSTL | Sale | 5,982 @ $24.13 | $144K | −21.6% of holding | 21,711 | Form 4 |
| 2026-07-27 | CSTL | Sale | 1,307 @ $24.13 | $32K | −3.3% of holding | 38,046 | Form 4 |
| 2026-07-27 | CSTL | Sale | 1,110 @ $24.13 | $27K | −3.3% of holding | 32,339 | Form 4 |
| 2026-07-27 | CSTL | Sale | 268 @ $24.13 | $6K | −2.2% of holding | 11,822 | Form 4 |
| 2026-07-27 | CSTL | Sale | 232 @ $25.06 | $6K | −1.1% of holding | 21,479 | Form 4 |
| 2026-07-27 | CSTL | Sale | 50 @ $25.06 | $1K | −0.1% of holding | 37,996 | Form 4 |
| 2026-07-27 | CSTL | Sale | 43 @ $25.06 | $1K | −0.1% of holding | 32,296 | Form 4 |
| 2026-07-27 | CSTL | Sale | 10 @ $25.06 | $251 | −0.1% of holding | 11,812 | Form 4 |
| 2026-07-14 | CSTL | Sale | 1,357 @ $22.92 | $31K | −3.3% of holding | 39,353 | Form 4 |
| 2026-07-14 | CSTL | Sale | 1,153 @ $22.92 | $26K | −3.3% of holding | 33,449 | Form 4 |
| 2026-07-14 | CSTL | Sale | 550 @ $22.92 | $13K | −2.5% of holding | 21,479 | Form 4 |
| 2026-07-14 | CSTL | Sale | 278 @ $22.92 | $6K | −2.2% of holding | 12,090 | Form 4 |
| 2026-07-01 | CSTL | Sale | 6,214 @ $24.29 | $151K | −22.4% of holding | 21,479 | Form 4 |
| 2026-07-01 | CSTL | Sale | 1,357 @ $24.29 | $33K | −3.2% of holding | 40,710 | Form 4 |
| 2026-07-01 | CSTL | Sale | 1,153 @ $24.29 | $28K | −3.2% of holding | 34,602 | Form 4 |
| 2026-07-01 | CSTL | Sale | 278 @ $24.29 | $7K | −2.2% of holding | 12,368 | Form 4 |
| 2026-06-15 | CSTL | Sale | 1,357 @ $20.66 | $28K | −3.1% of holding | 42,067 | Form 4 |
| 2026-06-15 | CSTL | Sale | 1,153 @ $20.66 | $24K | −3.1% of holding | 35,755 | Form 4 |
| 2026-06-15 | CSTL | Sale | 550 @ $20.66 | $11K | −2.5% of holding | 21,479 | Form 4 |
| 2026-06-15 | CSTL | Sale | 278 @ $20.66 | $6K | −2.2% of holding | 12,646 | Form 4 |
| 2026-06-01 | CSTL | Sale | 6,214 @ $20.86 | $130K | −22.4% of holding | 21,479 | Form 4 |
| 2026-06-01 | CSTL | Sale | 1,357 @ $20.86 | $28K | −3.0% of holding | 43,424 | Form 4 |
| 2026-06-01 | CSTL | Sale | 1,153 @ $20.86 | $24K | −3.0% of holding | 36,908 | Form 4 |
| 2026-06-01 | CSTL | Sale | 278 @ $20.86 | $6K | −14.3% of holding | 1,668 | Form 4 |
| 2026-05-21 | CSTL | Sale | 1,035 @ $20.20 | $21K | −2.3% of holding | 44,781 | Form 4 |
| 2026-05-21 | CSTL | Sale | 880 @ $20.20 | $18K | −2.3% of holding | 38,061 | Form 4 |
| 2026-05-21 | CSTL | Sale | 420 @ $20.20 | $8K | −1.9% of holding | 21,479 | Form 4 |
| 2026-05-21 | CSTL | Sale | 212 @ $20.20 | $4K | −9.8% of holding | 1,946 | Form 4 |
| 2026-05-20 | CSTL | Sale | 322 @ $20.00 | $6K | −0.7% of holding | 45,816 | Form 4 |
| 2026-05-20 | CSTL | Sale | 273 @ $20.00 | $5K | −0.7% of holding | 38,941 | Form 4 |
| 2026-05-20 | CSTL | Sale | 130 @ $20.00 | $3K | −0.6% of holding | 21,479 | Form 4 |
| 2026-05-20 | CSTL | Sale | 66 @ $20.00 | $1K | −3.0% of holding | 2,158 | Form 4 |
| 2026-05-07 | CSTL | Sale | 5,308 @ $22.08 | $117K | −19.2% of holding | 22,385 | Form 4 |
| 2026-05-07 | CSTL | Sale | 1,159 @ $22.08 | $26K | −2.4% of holding | 46,336 | Form 4 |
| 2026-05-07 | CSTL | Sale | 985 @ $22.08 | $22K | −2.4% of holding | 39,382 | Form 4 |
| 2026-05-07 | CSTL | Sale | 906 @ $22.59 | $20K | −4.0% of holding | 21,479 | Form 4 |
| 2026-05-07 | CSTL | Sale | 237 @ $22.08 | $5K | −9.5% of holding | 2,265 | Form 4 |
| 2026-05-07 | CSTL | Sale | 198 @ $22.59 | $4K | −0.4% of holding | 46,138 | Form 4 |
| 2026-05-07 | CSTL | Sale | 168 @ $22.59 | $4K | −0.4% of holding | 39,214 | Form 4 |
| 2026-05-07 | CSTL | Sale | 41 @ $22.59 | $926 | −1.8% of holding | 2,224 | Form 4 |
| 2026-04-21 | CSTL | Sale | 1,357 @ $25.10 | $34K | −2.8% of holding | 47,495 | Form 4 |
| 2026-04-21 | CSTL | Sale | 1,153 @ $25.10 | $29K | −2.8% of holding | 40,367 | Form 4 |
| 2026-04-21 | CSTL | Sale | 550 @ $25.10 | $14K | −2.5% of holding | 21,479 | Form 4 |
| 2026-04-21 | CSTL | Sale | 278 @ $25.10 | $7K | −10.0% of holding | 2,502 | Form 4 |
| 2026-04-06 | CSTL | Sale | 6,214 @ $25.03 | $156K | −22.4% of holding | 21,479 | Form 4 |
| 2026-04-06 | CSTL | Sale | 1,357 @ $25.03 | $34K | −2.7% of holding | 48,852 | Form 4 |
| 2026-04-06 | CSTL | Sale | 1,153 @ $25.03 | $29K | −2.7% of holding | 41,520 | Form 4 |
77 award / exercise / gift records — not counted as purchases
| Date | Company | Action | Shares | Owned after | Filing |
|---|---|---|---|---|---|
| 2026-09-11 | CSTL | Option exercise | 8,584 | 30,063 | Form 4 |
| 2026-09-11 | CSTL | Option exercise | 8,584 | 16,745 | Form 4 |
| 2026-08-28 | CSTL | Option exercise | 12,428 | 33,907 | Form 4 |
| 2026-08-28 | CSTL | Option exercise | 12,428 | 25,329 | Form 4 |
| 2026-08-14 | CSTL | Option exercise | 1,100 | 22,579 | Form 4 |
| 2026-08-14 | CSTL | Option exercise | 1,100 | 37,757 | Form 4 |
| 2026-08-05 | CSTL | Option exercise | 2,546 | 24,025 | Form 4 |
| 2026-08-05 | CSTL | Option exercise | 2,546 | 38,857 | Form 4 |
| 2026-08-04 | CSTL | Option exercise | 20,356 | 41,835 | Form 4 |
| 2026-08-04 | CSTL | Option exercise | 20,356 | 41,403 | Form 4 |
| 2026-08-03 | CSTL | Option exercise | 10,664 | 32,143 | Form 4 |
| 2026-08-03 | CSTL | Option exercise | 10,664 | 61,759 | Form 4 |
| 2026-07-31 | CSTL | Option exercise | 6,480 | 27,959 | Form 4 |
| 2026-07-31 | CSTL | Option exercise | 6,480 | 72,423 | Form 4 |
| 2026-07-27 | CSTL | Option exercise | 6,214 | 27,693 | Form 4 |
| 2026-07-27 | CSTL | Option exercise | 6,214 | 78,903 | Form 4 |
| 2026-07-14 | CSTL | Option exercise | 550 | 22,029 | Form 4 |
| 2026-07-14 | CSTL | Option exercise | 550 | 85,117 | Form 4 |
| 2026-07-01 | CSTL | Option exercise | 6,214 | 27,693 | Form 4 |
| 2026-07-01 | CSTL | Option exercise | 6,214 | 85,667 | Form 4 |
| 2026-06-15 | CSTL | Option exercise | 550 | 22,029 | Form 4 |
| 2026-06-15 | CSTL | Option exercise | 550 | 91,881 | Form 4 |
| 2026-06-01 | CSTL | Option exercise | 6,010 | 27,693 | Form 4 |
| 2026-06-01 | CSTL | Option exercise | 204 | 21,683 | Form 4 |
| 2026-06-01 | CSTL | Option exercise | 204 | 0 | Form 4 |
| 2026-06-01 | CSTL | Option exercise | 6,010 | 92,431 | Form 4 |
| 2026-05-21 | CSTL | Option exercise | 420 | 21,899 | Form 4 |
| 2026-05-21 | CSTL | Option exercise | 420 | 204 | Form 4 |
| 2026-05-20 | CSTL | Option exercise | 130 | 21,609 | Form 4 |
| 2026-05-20 | CSTL | Option exercise | 130 | 624 | Form 4 |
| 2026-05-07 | CSTL | Option exercise | 6,214 | 27,693 | Form 4 |
| 2026-05-07 | CSTL | Option exercise | 6,214 | 754 | Form 4 |
| 2026-04-21 | CSTL | Option exercise | 550 | 22,029 | Form 4 |
| 2026-04-21 | CSTL | Option exercise | 550 | 6,968 | Form 4 |
| 2026-04-06 | CSTL | Option exercise | 6,214 | 27,693 | Form 4 |
| 2026-04-06 | CSTL | Option exercise | 6,214 | 7,518 | Form 4 |
| 2026-03-26 | CSTL | Option exercise | 550 | 22,029 | Form 4 |
| 2026-03-26 | CSTL | Option exercise | 550 | 13,732 | Form 4 |
| 2026-03-11 | CSTL | Option exercise | 6,226 | 112,047 | Form 4 |
| 2026-03-11 | CSTL | Option exercise | 6,226 | 14,282 | Form 4 |
Source: SEC Form 4 filings. Each row links to its original filing.
Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.