Arthur Tzianabos

CIK 1586226 · View on SEC EDGAR ↗

Insider

First SEC filing: June 5, 2026 · Latest: June 5, 2026

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Insider at

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 45 non-open-market transactions below last 12 months, based on the transactions shown below

Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

45 other filings hidden
Date Ticker Code Shares Price Value Owned after Δ own A/D vs now
March 25, 2024 QTTB S 265 $24.20 $6,413 7,983 Direct -3.21% Disposed -96.3% (price as of 2026-08-21)
Jan. 9, 2024 QTTB S 10b5-1 13,037 $0.57 $7,431 128,778 Direct -9.19% Disposed 57.6% (price as of 2026-08-21)
Jan. 9, 2023 QTTB S 10b5-1 10,616 $1.39 $14,756 108,395 Direct -8.92% Disposed -35.4% (price as of 2026-08-21)
Jan. 5, 2022 QTTB S 10b5-1 5,354 $3.78 $20,238 86,011 Direct -5.86% Disposed -76.2% (price as of 2026-08-21)
Feb. 19, 2021 STOK S 10b5-1 10,000 $60.67 $606,700 0 Direct -100.00% Disposed -47.6% (price as of 2026-08-21)
Nov. 23, 2020 STOK S 10b5-1 210 $47.61 $9,998 0 Direct -100.00% Disposed -33.3% (price as of 2026-08-21)
Nov. 23, 2020 STOK S 10b5-1 5,294 $46.85 $248,024 210 Direct -96.18% Disposed -32.2% (price as of 2026-08-21)
Nov. 23, 2020 STOK S 10b5-1 10,196 $45.97 $468,710 5,504 Direct -64.94% Disposed -30.9% (price as of 2026-08-21)
Nov. 23, 2020 STOK S 10b5-1 4,300 $45.08 $193,844 15,700 Direct -21.50% Disposed -29.5% (price as of 2026-08-21)
Feb. 3, 2020 QTTB S 10b5-1 12,500 $16.16 $202,000 77,505 Direct -13.89% Disposed -94.4% (price as of 2026-08-21)
Jan. 2, 2020 QTTB S 10b5-1 12,500 $20.50 $256,250 90,005 Direct -12.19% Disposed -95.6% (price as of 2026-08-21)
Dec. 2, 2019 QTTB S 10b5-1 12,500 $16.25 $203,125 102,505 Direct -10.87% Disposed -94.5% (price as of 2026-08-21)
Nov. 29, 2019 QTTB S 10b5-1 12,500 $16.04 $200,500 115,005 Direct -9.80% Disposed -94.4% (price as of 2026-08-21)
Oct. 1, 2019 QTTB S 10b5-1 100 $18.23 $1,823 127,505 Direct -0.08% Disposed -95.1% (price as of 2026-08-21)
Oct. 1, 2019 QTTB S 10b5-1 12,400 $17.39 $215,636 127,605 Direct -8.86% Disposed -94.8% (price as of 2026-08-21)
Sept. 3, 2019 QTTB S 10b5-1 12,500 $18.75 $234,375 140,005 Direct -8.20% Disposed -95.2% (price as of 2026-08-21)
Aug. 1, 2019 QTTB S 10b5-1 12,500 $17.37 $217,125 152,505 Direct -7.58% Disposed -94.8% (price as of 2026-08-21)
July 1, 2019 QTTB S 10b5-1 12,500 $18.98 $237,250 165,005 Direct -7.04% Disposed -95.3% (price as of 2026-08-21)
June 3, 2019 QTTB S 10b5-1 12,500 $19.86 $248,250 177,505 Direct -6.58% Disposed -95.5% (price as of 2026-08-21)
April 9, 2015 TPST P 225 $28.77 $6,473 400 Direct +128.57% Acquired -100.0% (price as of 2026-08-21)
April 8, 2015 TPST P 175 $28.04 $4,907 175 Direct — Acquired -100.0% (price as of 2026-08-21)
Sept. 12, 2013 TPST P 1,000 $10.32 $10,320 1,000 Indirect — Acquired -100.0% (price as of 2026-08-21)

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
June 12, 2026 QTTB Stock Option (Right to Buy) Common Stock $12.64 June 11, 2036 10,826 Acquired
June 12, 2026 QTTB Stock Option (Right to Buy) Common Stock (9,810) $12.64 June 11, 2036 9,810 Acquired
Oct. 23, 2025 QTTB Stock Option (Right to Buy) Common Stock (53,521) $2.80 Oct. 22, 2035 53,521 Acquired
March 20, 2025 STOK Stock Option (Right to Buy) Common Stock (122,651) $8.33 March 19, 2035 122,651 Acquired
Feb. 24, 2025 QTTB Stock Option (Right to Buy) Common Stock (12,767) — March 24, 2034 12,767 Acquired
Feb. 24, 2025 QTTB Stock Option (Right to Buy) Common Stock (12,767) $16.82 March 24, 2034 12,767 Disposed
Feb. 24, 2025 QTTB Stock Option (Right to Buy) Common Stock (25,674) — April 22, 2026 25,674 Acquired
Feb. 24, 2025 QTTB Stock Option (Right to Buy) Common Stock (25,674) $7.09 April 22, 2026 25,674 Disposed
June 5, 2024 STOK Director Stock Option (Right to Buy) Common Stock (7,639) $16.41 June 4, 2034 7,639 Acquired
March 25, 2024 QTTB Restricted Stock Units Common Stock (1,095) — — 1,095 Disposed
March 25, 2024 QTTB Stock Option (Right to Buy) Common Stock (12,767) $16.82 March 24, 2034 12,767 Acquired
Feb. 13, 2024 STOK Stock Option (Right to Buy) Common Stock (31,739) $2.19 Dec. 12, 2028 31,739 Disposed
Jan. 1, 2024 QTTB Restricted Stock Units Common Stock (19,140) — — 19,140 Disposed
Jan. 1, 2024 QTTB Restricted Stock Units Common Stock (14,280) — — 14,280 Disposed
June 14, 2023 QTTB Option (Right to Buy) Common Stock (23,000) $1.03 June 14, 2033 23,000 Acquired
June 13, 2023 STOK Director Stock Option (Right to Buy) Common Stock (19,441) $12.46 June 12, 2033 19,441 Acquired
Jan. 1, 2023 QTTB Restricted Stock Units Common Stock (19,140) — — 19,140 Disposed
Jan. 1, 2023 QTTB Restricted Stock Units Common Stock (13,860) — — 13,860 Disposed
June 7, 2022 STOK Director Stock Option (Right to Buy) Common Stock (21,000) $12.96 June 6, 2032 21,000 Acquired
Feb. 24, 2022 QTTB Restricted Stock Units Common Stock (58,000) — — 58,000 Acquired
Feb. 24, 2022 QTTB Employee Stock Option (Right to Buy) Common Stock (350,000) $2.71 Feb. 24, 2032 350,000 Acquired
Jan. 1, 2022 QTTB Restricted Stock Units Common Stock (13,860) — — 13,860 Disposed
June 8, 2021 STOK Director Stock Option (Right to Buy) Common Stock (11,650) $40.37 June 7, 2031 11,650 Acquired
Feb. 19, 2021 STOK Director Stock Option (Right to Buy) Common Stock (10,000) $2.19 Dec. 12, 2028 10,000 Disposed
Feb. 5, 2021 QTTB Restricted Stock Units Common Stock (42,000) — — 42,000 Acquired
Feb. 5, 2021 QTTB Employee Stock Option (Right to Buy) Common Stock (254,000) $13.78 Feb. 5, 2031 254,000 Acquired
Nov. 23, 2020 STOK Director Stock Option (Right to Buy) Common Stock (20,000) $2.19 Dec. 12, 2028 20,000 Disposed
June 3, 2020 STOK Director Stock Option (Right to Buy) Common Stock (14,777) $26.53 June 2, 2030 14,777 Acquired
Dec. 11, 2019 QTTB Employee Stock Option (Right to Buy) Common Stock (358,000) $19.92 Dec. 11, 2029 358,000 Acquired
Dec. 14, 2018 QTTB Employee stock option Common Stock (203,000) $24.28 Dec. 14, 2028 203,000 Acquired
March 27, 2018 QTTB Employee stock option Common Stock (92,376) $16.00 March 27, 2028 92,376 Acquired
Dec. 9, 2014 TPST Stock Option (right to buy) Common Stock (270,000) $32.36 Dec. 9, 2024 270,000 Acquired
Dec. 5, 2013 TPST Stock Option (right to buy) Common Stock (165,000) $8.58 Dec. 5, 2023 165,000 Acquired
Sept. 10, 2013 TPST Stock Option (right to buy) Common Stock (312,000) $14.27 Sept. 10, 2023 312,000 Acquired

Exercise/conversion price is blank when not applicable (e.g. RSUs).

Initial ownership (Form 3) 4 holdings

Securities held when first becoming an insider, per SEC Form 3.

Date Ticker Security Shares Ownership
June 18, 2019 STOK Employee Stock Option (Right to Buy)→ Common Stock (61,739) 61,739 Direct
March 27, 2018 QTTB Common Stock 190,005 Direct
March 27, 2018 QTTB Employee Stock Options→ Common Stock (462,135) 462,135 Direct
March 27, 2018 QTTB Employee Stock Option→ Common Stock (514,653) 514,653 Direct

Compensation (DEF 14A)

Matched by name from proxy statements (DEF 14A) — verify against the filing.

TPST

Fiscal year Salary Bonus Stock awards Option awards Non-equity incentive Pension change Other Total
2016 $120,962 — — — — — $328,916 $449,878
2015 $422,692 $127,500 $183,938 — — — $13,459 $747,589
2014 $350,000 $294,000 — $3,507,672 — — $13,258 $4,164,930

QTTB

Fiscal year Salary Bonus Stock awards Option awards Non-equity incentive Pension change Other Total
2020 $563,200 — — — $309,760 — $13,000 $885,960
2019 $537,600 — — $4,217,097 $295,680 — $12,500 $5,062,877

Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.