David Alan Ciesinski
Insider
First SEC filing: June 24, 2026 · Latest: June 24, 2026
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net: $0
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Aug. 25, 2026 | MZTI | A | 4,177 | · | · | 61,133 Direct | +7.33% | Acquired | (price as of 2026-10-05) |
| Aug. 25, 2026 | MZTI | F | 1,611 | $116.05 | $186,957 | 59,522 Direct | -2.64% | Disposed | -14.3% (price as of 2026-10-05) |
| Aug. 18, 2026 | MZTI | A | 14,406 | · | · | 14,406 Direct | · | Acquired | (price as of 2026-10-05) |
| Aug. 15, 2026 | MZTI | F | 2,055 | $116.05 | $238,483 | 56,956 Direct | -3.48% | Disposed | -14.3% (price as of 2026-10-05) |
| June 23, 2026 | WTRG | A | 3,666 | $36.82 | $134,982 | 16,800 Direct | +27.91% | Acquired | 5.0% (price as of 2026-10-05) |
| Aug. 21, 2025 | MZTI | A | 12,881 | · | · | 64,851 Direct | +24.79% | Acquired | (price as of 2026-10-05) |
| Aug. 21, 2025 | MZTI | F | 5,840 | $180.29 | $1,052,894 | 59,011 Direct | -9.01% | Disposed | -44.8% (price as of 2026-10-05) |
| Aug. 16, 2025 | MZTI | F | 2,674 | $180.29 | $482,095 | 51,970 Direct | -4.89% | Disposed | -44.8% (price as of 2026-10-05) |
| Aug. 12, 2025 | MZTI | A | 8,714 | · | · | 8,714 Direct | · | Acquired | (price as of 2026-10-05) |
| June 23, 2025 | WTRG | A | 3,608 | $37.42 | $135,011 | 13,134 Direct | +37.88% | Acquired | 3.3% (price as of 2026-10-05) |
| Feb. 13, 2025 | MZTI | S | 17,000 | $191.19 | $3,250,230 | 54,644 Direct | -23.73% | Disposed | -48.0% (price as of 2026-10-05) |
| Aug. 23, 2024 | MZTI | A | 8,467 | · | · | 75,483 Direct | +12.63% | Acquired | (price as of 2026-10-05) |
| Aug. 23, 2024 | MZTI | F | 3,839 | $198.38 | $761,581 | 71,644 Direct | -5.09% | Disposed | -49.8% (price as of 2026-10-05) |
| Aug. 17, 2024 | MZTI | F | 2,466 | $198.38 | $489,205 | 67,016 Direct | -3.55% | Disposed | -49.8% (price as of 2026-10-05) |
| Aug. 13, 2024 | MZTI | A | 6,981 | · | · | 69,482 Direct | +11.17% | Acquired | (price as of 2026-10-05) |
| June 21, 2024 | WTRG | A | 3,259 | $36.82 | $119,996 | 9,526 Direct | +52.00% | Acquired | 5.0% (price as of 2026-10-05) |
| Feb. 29, 2024 | MZTI | M | 39,416 | $177.99 | $7,015,654 | 98,906 Direct | +66.26% | Acquired | -44.1% (price as of 2026-10-05) |
| Feb. 29, 2024 | MZTI | F | 2,499 | $206.92 | $517,093 | 96,407 Direct | -2.53% | Disposed | -51.9% (price as of 2026-10-05) |
| Feb. 29, 2024 | MZTI | D | 33,906 | $206.92 | $7,015,830 | 62,501 Direct | -35.17% | Disposed | -51.9% (price as of 2026-10-05) |
| Feb. 29, 2024 | MZTI | M | 39,416 | $177.99 | $7,015,654 | 0 Direct | -100.00% | Disposed | -44.1% (price as of 2026-10-05) |
| Feb. 23, 2024 | MZTI | F | 1,961 | $199.81 | $391,827 | 59,490 Direct | -3.19% | Disposed | -50.2% (price as of 2026-10-05) |
| Feb. 6, 2024 | MZTI | M | 56,569 | $153.71 | $8,695,221 | 110,923 Direct | +104.08% | Acquired | -35.3% (price as of 2026-10-05) |
| Feb. 6, 2024 | MZTI | F | 4,486 | $193.29 | $867,099 | 106,437 Direct | -4.04% | Disposed | -48.5% (price as of 2026-10-05) |
| Feb. 6, 2024 | MZTI | D | 44,986 | $193.29 | $8,695,344 | 61,451 Direct | -42.27% | Disposed | -48.5% (price as of 2026-10-05) |
| Feb. 6, 2024 | MZTI | M | 56,569 | $153.71 | $8,695,221 | 0 Direct | -100.00% | Disposed | -35.3% (price as of 2026-10-05) |
| Aug. 15, 2023 | MZTI | A | 6,943 | · | · | 54,354 Direct | +14.64% | Acquired | (price as of 2026-10-05) |
| Aug. 15, 2023 | MZTI | A | 361 | · | · | 47,772 Direct | +0.76% | Acquired | (price as of 2026-10-05) |
| June 20, 2023 | WTRG | A | 2,173 | $41.42 | $90,006 | 6,267 Direct | +53.08% | Acquired | -6.6% (price as of 2026-10-05) |
| March 20, 2023 | WTRG | A | 702 | $42.76 | $30,018 | 4,094 Direct | +20.70% | Acquired | -9.6% (price as of 2026-10-05) |
| Feb. 25, 2023 | MZTI | F | 1,449 | $192.42 | $278,817 | 46,925 Direct | -3.00% | Disposed | -48.3% (price as of 2026-10-05) |
| Dec. 20, 2022 | WTRG | A | 591 | $46.56 | $27,517 | 3,392 Direct | +21.10% | Acquired | -16.9% (price as of 2026-10-05) |
| Nov. 10, 2022 | MZTI | S | 137 | $210.14 | $28,789 | 50,462 Direct | -0.27% | Disposed | -52.7% (price as of 2026-10-05) |
| Nov. 10, 2022 | MZTI | S | 373 | $208.35 | $77,715 | 50,089 Direct | -0.74% | Disposed | -52.2% (price as of 2026-10-05) |
| Nov. 10, 2022 | MZTI | S | 1,715 | $209.25 | $358,864 | 48,374 Direct | -3.42% | Disposed | -52.5% (price as of 2026-10-05) |
| Nov. 8, 2022 | MZTI | M | 15,654 | $154.48 | $2,418,230 | 71,954 Direct | +27.80% | Acquired | -35.6% (price as of 2026-10-05) |
| Nov. 8, 2022 | MZTI | F | 1,845 | $208.76 | $385,162 | 70,109 Direct | -2.56% | Disposed | -52.3% (price as of 2026-10-05) |
| Nov. 8, 2022 | MZTI | S | 7,926 | $210.01 | $1,664,539 | 62,183 Direct | -11.31% | Disposed | -52.6% (price as of 2026-10-05) |
| Nov. 8, 2022 | MZTI | D | 11,584 | $208.76 | $2,418,276 | 50,599 Direct | -18.63% | Disposed | -52.3% (price as of 2026-10-05) |
| Nov. 8, 2022 | MZTI | M | 15,654 | · | · | 15,654 Direct | -50.00% | Disposed | (price as of 2026-10-05) |
| Sept. 20, 2022 | WTRG | A | 600 | $45.84 | $27,504 | 2,801 Direct | +27.26% | Acquired | -15.6% (price as of 2026-10-05) |
| Aug. 30, 2022 | MZTI | M | 15,654 | $154.48 | $2,418,230 | 85,458 Direct | +22.43% | Acquired | -35.6% (price as of 2026-10-05) |
| Aug. 30, 2022 | MZTI | F | 2,696 | $172.10 | $463,982 | 82,762 Direct | -3.15% | Disposed | -42.2% (price as of 2026-10-05) |
| Aug. 30, 2022 | MZTI | D | 25,976 | $172.10 | $4,470,470 | 56,786 Direct | -31.39% | Disposed | -42.2% (price as of 2026-10-05) |
| Aug. 30, 2022 | MZTI | M | 15,654 | · | · | 15,654 Direct | -50.00% | Disposed | (price as of 2026-10-05) |
| Aug. 30, 2022 | MZTI | M | 16,946 | $121.09 | $2,051,991 | 69,804 Direct | +32.06% | Acquired | -17.8% (price as of 2026-10-05) |
| Aug. 30, 2022 | MZTI | F | 2,210 | $172.10 | $380,341 | 67,594 Direct | -3.17% | Disposed | -42.2% (price as of 2026-10-05) |
| Aug. 30, 2022 | MZTI | D | 11,294 | $172.10 | $1,943,697 | 56,300 Direct | -16.71% | Disposed | -42.2% (price as of 2026-10-05) |
| Aug. 30, 2022 | MZTI | M | 16,946 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-05) |
| Aug. 16, 2022 | MZTI | A | 7,731 | · | · | 53,785 Direct | +16.79% | Acquired | (price as of 2026-10-05) |
| June 21, 2022 | WTRG | A | 656 | $41.92 | $27,500 | 2,201 Direct | +42.46% | Acquired | -7.8% (price as of 2026-10-05) |
| March 31, 2022 | WTRG | A | 532 | $51.66 | $27,483 | 1,545 Direct | +52.52% | Acquired | -25.1% (price as of 2026-10-05) |
| Feb. 26, 2022 | MZTI | F | 1,169 | $168.09 | $196,497 | 46,054 Direct | -2.48% | Disposed | -40.8% (price as of 2026-10-05) |
| Dec. 31, 2021 | WTRG | A | 466 | $53.65 | $25,001 | 1,013 Direct | +85.19% | Acquired | -27.9% (price as of 2026-10-05) |
| Sept. 30, 2021 | WTRG | A | 537 | $46.60 | $25,024 | 537 Direct | · | Acquired | -17.0% (price as of 2026-10-05) |
| Aug. 17, 2021 | MZTI | A | 5,438 | · | · | 47,223 Direct | +13.01% | Acquired | (price as of 2026-10-05) |
| Feb. 27, 2021 | MZTI | F | 1,228 | $174.67 | $214,495 | 41,785 Direct | -2.85% | Disposed | -43.0% (price as of 2026-10-05) |
| Feb. 23, 2021 | MZTI | A | 4,326 | · | · | 43,013 Direct | +11.18% | Acquired | (price as of 2026-10-05) |
| Feb. 23, 2021 | MZTI | A | 39,416 | · | · | 39,416 Direct | · | Acquired | (price as of 2026-10-05) |
| Sept. 2, 2020 | MZTI | M | 52,927 | · | · | 83,688 Direct | +172.06% | Acquired | (price as of 2026-10-05) |
| Sept. 2, 2020 | MZTI | F | 6,445 | $179.92 | $1,159,584 | 77,243 Direct | -7.70% | Disposed | -44.7% (price as of 2026-10-05) |
| Sept. 2, 2020 | MZTI | D | 38,556 | $179.92 | $6,936,996 | 38,687 Direct | -49.92% | Disposed | -44.7% (price as of 2026-10-05) |
| Sept. 2, 2020 | MZTI | M | 15,653 | · | · | 31,308 Direct | -33.33% | Disposed | (price as of 2026-10-05) |
| Sept. 2, 2020 | MZTI | M | 33,892 | · | · | 16,946 Direct | -66.67% | Disposed | (price as of 2026-10-05) |
| Sept. 2, 2020 | MZTI | M | 3,382 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-05) |
| June 30, 2020 | MZTI | F | 320 | $154.99 | $49,597 | 30,761 Direct | -1.03% | Disposed | -35.8% (price as of 2026-10-05) |
| June 8, 2020 | MZTI | M | 43,402 | · | · | 69,070 Direct | +169.09% | Acquired | (price as of 2026-10-05) |
| June 8, 2020 | MZTI | F | 3,438 | $167.23 | $574,937 | 65,632 Direct | -4.98% | Disposed | -40.5% (price as of 2026-10-05) |
| June 8, 2020 | MZTI | D | 34,551 | $167.23 | $5,777,964 | 31,081 Direct | -52.64% | Disposed | -40.5% (price as of 2026-10-05) |
| June 8, 2020 | MZTI | M | 36,640 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-05) |
| June 8, 2020 | MZTI | M | 6,762 | · | · | 3,382 Direct | -66.66% | Disposed | (price as of 2026-10-05) |
| Feb. 25, 2020 | MZTI | A | 4,782 | · | · | 25,668 Direct | +22.90% | Acquired | (price as of 2026-10-05) |
| Feb. 25, 2020 | MZTI | A | 56,569 | · | · | 56,569 Direct | · | Acquired | (price as of 2026-10-05) |
| Feb. 21, 2020 | MZTI | F | 750 | $156.95 | $117,712 | 20,886 Direct | -3.47% | Disposed | -36.6% (price as of 2026-10-05) |
| Nov. 14, 2019 | MZTI | M | 47,707 | · | · | 62,019 Direct | +333.34% | Acquired | (price as of 2026-10-05) |
| Nov. 14, 2019 | MZTI | F | 5,955 | $156.06 | $929,337 | 56,064 Direct | -9.60% | Disposed | -36.2% (price as of 2026-10-05) |
| Nov. 14, 2019 | MZTI | D | 34,428 | $156.06 | $5,372,834 | 21,636 Direct | -61.41% | Disposed | -36.2% (price as of 2026-10-05) |
| Nov. 14, 2019 | MZTI | M | 47,707 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-05) |
| April 18, 2019 | MZTI | F | 927 | $155.25 | $143,917 | 13,385 Direct | -6.48% | Disposed | -35.9% (price as of 2026-10-05) |
| Feb. 26, 2019 | MZTI | A | 3,852 | · | · | 14,312 Direct | +36.83% | Acquired | (price as of 2026-10-05) |
| Feb. 26, 2019 | MZTI | A | 46,961 | · | · | 46,961 Direct | · | Acquired | (price as of 2026-10-05) |
| Feb. 27, 2018 | MZTI | A | 4,047 | · | · | 10,460 Direct | +63.11% | Acquired | (price as of 2026-10-05) |
| Feb. 27, 2018 | MZTI | A | 50,838 | · | · | 50,838 Direct | · | Acquired | (price as of 2026-10-05) |
| June 30, 2017 | MZTI | A | 714 | · | · | 6,413 Direct | +12.53% | Acquired | (price as of 2026-10-05) |
| June 30, 2017 | MZTI | A | 10,144 | · | · | 10,144 Direct | · | Acquired | (price as of 2026-10-05) |
| Feb. 21, 2017 | MZTI | A | 36,640 | · | · | 36,640 Direct | · | Acquired | (price as of 2026-10-05) |
| Feb. 21, 2017 | MZTI | A | 2,591 | · | · | 5,699 Direct | +83.37% | Acquired | (price as of 2026-10-05) |
| April 18, 2016 | MZTI | A | 47,707 | · | · | 47,707 Direct | · | Acquired | (price as of 2026-10-05) |
| April 18, 2016 | MZTI | A | 3,108 | · | · | 3,108 Direct | · | Acquired | (price as of 2026-10-05) |
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II) Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| Aug. 18, 2026 | MZTI | Restricted Stock Units | Common Stock | · | Aug. 18, 2029 | 14,406 | Acquired |
| Aug. 12, 2025 | MZTI | Restricted Stock Units | Common Stock | · | Aug. 12, 2028 | 8,714 | Acquired |
| Feb. 29, 2024 | MZTI | Stock Appreciation Right | Common Stock | $177.99 | Feb. 23, 2028 | 39,416 | Disposed |
| Feb. 6, 2024 | MZTI | Stock Appreciation Right | Common Stock | $153.71 | Feb. 25, 2027 | 56,569 | Disposed |
| Nov. 8, 2022 | MZTI | Stock Appreciation Right | Common Stock | $154.48 | Feb. 26, 2024 | 15,654 | Disposed |
| Aug. 30, 2022 | MZTI | Stock Appreciation Right | Common Stock | $154.48 | Feb. 26, 2024 | 15,654 | Disposed |
| Aug. 30, 2022 | MZTI | Stock Appreciation Right | Common Stock | $121.09 | Feb. 27, 2023 | 16,946 | Disposed |
| Feb. 23, 2021 | MZTI | Stock Appreciation Right | Common Stock | $177.99 | Feb. 23, 2028 | 39,416 | Acquired |
| Sept. 2, 2020 | MZTI | Stock Appreciation Right | Common Stock | $154.48 | Feb. 26, 2024 | 15,653 | Disposed |
| Sept. 2, 2020 | MZTI | Stock Appreciation Right | Common Stock | $121.09 | Feb. 27, 2023 | 33,892 | Disposed |
| Sept. 2, 2020 | MZTI | Stock Appreciation Right | Common Stock | $122.62 | June 30, 2022 | 3,382 | Disposed |
| June 8, 2020 | MZTI | Stock Appreciation Right | Common Stock | $135.06 | Feb. 21, 2022 | 36,640 | Disposed |
| June 8, 2020 | MZTI | Stock Appreciation Right | Common Stock | $122.62 | June 30, 2022 | 6,762 | Disposed |
| Feb. 25, 2020 | MZTI | Stock Appreciation Right | Common Stock | $153.71 | Feb. 25, 2027 | 56,569 | Acquired |
| Nov. 14, 2019 | MZTI | Stock Appreciation Right | Common Stock | $112.62 | April 18, 2021 | 47,707 | Disposed |
| Feb. 26, 2019 | MZTI | Stock Appreciation Right | Common Stock | $154.48 | Feb. 26, 2024 | 46,961 | Acquired |
| Feb. 27, 2018 | MZTI | Stock Appreciation Right | Common Stock | $121.09 | Feb. 27, 2023 | 50,838 | Acquired |
| June 30, 2017 | MZTI | Stock Appreciation Right | Common Stock | $122.62 | June 30, 2022 | 10,144 | Acquired |
| Feb. 21, 2017 | MZTI | Stock Appreciation Right | Common Stock | $17.74 | Feb. 21, 2022 | 36,640 | Acquired |
| April 18, 2016 | MZTI | Stock Appreciation Right | Common Stock | $13.62 | April 18, 2021 | 47,707 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Compensation (DEF 14A)
Matched by name from proxy statements (DEF 14A) — verify against the filing.
| Fiscal year | Salary | Bonus | Stock awards | Option awards | Non-equity incentive | Pension change | Other | Total |
|---|---|---|---|---|---|---|---|---|
| 2025 | $975,000 | · | · | · | $1,292,363 | · | $110,885 | $5,378,360 |
| 2024 | $935,000 | · | · | · | $1,520,404 | · | $110,037 | $5,415,614 |
| 2023 | $890,000 | · | · | · | $1,443,340 | · | $96,399 | $5,029,587 |
Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.