ZeroStack (ZSTK) Stock: Why It's Down Today
Updated Oct 19, 2026, 4:00 PM ET · closing price
- Closed at $3.89, -2.75% vs the prior close of $4.00.
- Volume 8.07K shares, 0.0x its 50-day average (light).
- New SEC filings: SCHEDULE 13G (Oct 19, 2026).
- No new insider buys or sales reported since the prior session.
ZSTK dips 2.7% to $3.89, a 1-month low. Closed at $3.89, -2.75% vs the prior close of $4.00. Day range $3.83–$4.00, opened at $3.90.
ZSTK daily analysis — what happened
A plain-English, data-only note for every US trading day (today's note updates every 2 hours while the market is open). Newest first; older days stay archived below.
Oct 19, 2026 — ZSTK dips 2.7% to $3.89, a 1-month low
- Closed at $3.89, -2.75% vs the prior close of $4.00. Day range $3.83–$4.00, opened at $3.90.
- Volume was 8.07K shares, 0.0x its 50-day average of 615.68K — lighter than usual.
- Price is -9.4% vs its 50-day average ($4.30) and -27.1% vs its 200-day average ($5.33).
- 52-week range $1.32–$19.68; today's close sits at 14% of that range, 80.2% below the 52-week high.
Oct 16, 2026 — ZSTK slides 5.2% to $4.00
- Closed at $4.00, -5.21% vs the prior close of $4.22. Day range $4.00–$4.25, opened at $4.22.
- Volume was 41.89K shares, 0.1x its 50-day average of 615.04K — lighter than usual.
- Price is -5.9% vs its 50-day average ($4.25) and -25.2% vs its 200-day average ($5.34).
- 52-week range $1.32–$20.10; today's close sits at 14% of that range, 80.1% below the 52-week high.
Oct 15, 2026 — ZSTK jumps 4.2% to $4.22
- Closed at $4.22, +4.20% vs the prior close of $4.05. Day range $4.00–$4.35, opened at $4.00.
- Volume was 35.40K shares, 0.1x its 50-day average of 614.55K — lighter than usual.
- Price is +0.3% vs its 50-day average ($4.21) and -21.2% vs its 200-day average ($5.36).
- 52-week range $1.32–$20.45; today's close sits at 15% of that range, 79.4% below the 52-week high.
Oct 14, 2026 — ZSTK slides 7.3% to $4.05, 5 down days in a row
- Closed at $4.05, -7.32% vs the prior close of $4.37. Day range $3.93–$4.37, opened at $4.37.
- Volume was 23.20K shares, 0.0x its 50-day average of 614.85K — lighter than usual.
- Price is -2.6% vs its 50-day average ($4.16) and -24.6% vs its 200-day average ($5.37).
- 52-week range $1.32–$20.45; today's close sits at 14% of that range, 80.2% below the 52-week high.
- That makes 5 straight losses.
Oct 13, 2026 — ZSTK ends flat (+0.0%) to $4.37, 4 down days in a row
- Closed at $4.37, +0.00% vs the prior close of $4.37. Day range $4.17–$4.57, opened at $4.57.
- Volume was 8.50K shares, 0.0x its 50-day average of 616.07K — lighter than usual.
- Price is +6.2% vs its 50-day average ($4.12) and -18.9% vs its 200-day average ($5.39).
- 52-week range $1.32–$20.45; today's close sits at 16% of that range, 78.6% below the 52-week high.
- That makes 4 straight losses.
Oct 12, 2026 — ZSTK slides 5.4% to $4.37, 3 down days in a row
- Closed at $4.37, -5.41% vs the prior close of $4.62. Day range $4.33–$4.53, opened at $4.53.
- Volume was 24.20K shares, 0.0x its 50-day average of 615.71K — lighter than usual.
- Price is +7.5% vs its 50-day average ($4.06) and -19.1% vs its 200-day average ($5.40).
- 52-week range $1.32–$20.45; today's close sits at 16% of that range, 78.6% below the 52-week high.
- That makes 3 straight losses.
Oct 9, 2026 — ZSTK dips 0.4% to $4.62
- Closed at $4.62, -0.43% vs the prior close of $4.64. Day range $4.51–$4.72, opened at $4.67.
- Volume was 9.40K shares, 0.0x its 50-day average of 615.79K — lighter than usual.
- Price is +15.3% vs its 50-day average ($4.01) and -14.7% vs its 200-day average ($5.42).
- 52-week range $1.32–$20.45; today's close sits at 17% of that range, 77.4% below the 52-week high.
Oct 8, 2026 — ZSTK dips 2.7% to $4.64
- Closed at $4.64, -2.73% vs the prior close of $4.77. Day range $4.38–$4.74, opened at $4.67.
- Volume was 20.10K shares, 0.0x its 50-day average of 615.65K — lighter than usual.
- Price is +17.6% vs its 50-day average ($3.94) and -14.6% vs its 200-day average ($5.43).
- 52-week range $1.32–$20.45; today's close sits at 17% of that range, 77.3% below the 52-week high.
Oct 7, 2026 — ZSTK rises 0.4% to $4.77
- Closed at $4.77, +0.42% vs the prior close of $4.75. Day range $4.75–$4.93, opened at $4.83.
- Volume was 10.40K shares, 0.0x its 50-day average of 615.67K — lighter than usual.
- Price is +22.9% vs its 50-day average ($3.88) and -12.4% vs its 200-day average ($5.44).
- 52-week range $1.32–$20.45; today's close sits at 18% of that range, 76.7% below the 52-week high.
Oct 6, 2026 — ZSTK dips 1.5% to $4.75
- Closed at $4.75, -1.45% vs the prior close of $4.82. Day range $4.55–$4.76, opened at $4.74.
- Volume was 17.70K shares, 0.0x its 50-day average of 615.66K — lighter than usual.
- Price is +24.6% vs its 50-day average ($3.81) and -13.0% vs its 200-day average ($5.46).
- 52-week range $1.32–$20.45; today's close sits at 18% of that range, 76.8% below the 52-week high.
Oct 5, 2026 — ZSTK dips 0.8% to $4.82
- Closed at $4.82, -0.82% vs the prior close of $4.86. Day range $4.68–$4.98, opened at $4.80.
- Volume was 27.40K shares, 0.0x its 50-day average of 615.42K — lighter than usual.
- Price is +28.6% vs its 50-day average ($3.75) and -11.9% vs its 200-day average ($5.47).
- 52-week range $1.32–$20.45; today's close sits at 18% of that range, 76.4% below the 52-week high.
Oct 2, 2026 — ZSTK rises 0.4% to $4.86
- Closed at $4.86, +0.41% vs the prior close of $4.84. Day range $4.56–$4.92, opened at $4.89.
- Volume was 17.40K shares, 0.0x its 50-day average of 616.01K — lighter than usual.
- Price is +32.1% vs its 50-day average ($3.68) and -11.5% vs its 200-day average ($5.49).
- 52-week range $1.32–$20.45; today's close sits at 19% of that range, 76.2% below the 52-week high.
ZSTK bull case vs bear case (from the data)
- Insiders made 4 open-market purchases in the last 12 months.
- Share count down 22.5% in a year (buybacks).
- Price is -9.4% vs its 50-day average — short-term trend is down.
- Price is -27.1% vs its 200-day average — below the long-term trend line.
- Annual revenue fell 0.5% in the latest fiscal year (SEC XBRL).
- Latest fiscal-year net income: loss of $15.91M.
- High volatility: average daily move of 3.2% over 20 sessions.
- Thin trading (under $2M a day on average) can mean wide bid/ask spreads.
ZSTK latest news & SEC filings
Every SEC filing by or about ZSTK in the last 120 days, explained in plain English. Updated daily, with a same-day refresh for new filings.
Oct 19, 2026 · Form SCHEDULE 13G — Passive stake (13G)
Passive stake (13G) — an investor reported owning more than 5%
Filed by an outside investor (not the company). It reports a holding of more than 5% of a share class; percentage and holder name are in the filing.
Sep 15, 2026 · Form EFFECT — EFFECT filing
EFFECT filing
Sep 4, 2026 · Form SCHEDULE 13G — Passive stake (13G)
Passive stake (13G) — an investor reported owning more than 5%
Filed by an outside investor (not the company). It reports a holding of more than 5% of a share class; percentage and holder name are in the filing.
Sep 2, 2026 · Form SCHEDULE 13G — Passive stake (13G)
Passive stake (13G) — an investor reported owning more than 5%
Filed by an outside investor (not the company). It reports a holding of more than 5% of a share class; percentage and holder name are in the filing.
Aug 28, 2026 · Form POS AM — POS AM filing
POS AM filing
Aug 28, 2026 · Form POS AM — POS AM filing
POS AM filing
Aug 28, 2026 · Form POS AM — POS AM filing
POS AM filing
Aug 28, 2026 · Form POS AM — POS AM filing
POS AM filing
Things to know before you trade ZSTK
- Last results release: Aug 10, 2023 (8-K Item 2.02). Previous ones: May 15, 2023, Mar 31, 2023. Based on that rhythm, the next report is likely around Nov 9, 2023 — an estimate, not a confirmed date.
- How much it moves: over the last 20 sessions the average daily move was 3.20% (largest 14.2%). That is a volatile stock.
- Liquidity: about 39.62K shares (≈$154.12K) trade per day on average. Thin volume can mean wider bid/ask spreads.
- 52-week position: $3.89 vs a range of $1.32–$19.68 (14% of the range).
- Dividends: no cash dividends in the last 2 years.
- Splits: 1:39 on Aug 4, 2025
- Insider trades (Form 4, last 12 months, recent 25 shown): 4 open-market buys, 4 sales; latest: Rudy Rong sold 1,000 shares on Aug 19, 2026.
- Latest filings: 8-K Aug 21, 2026; 8-K Aug 19, 2026; 10-Q Jul 31, 2026.
- Share count: 17.49M shares outstanding (Jul 27, 2026), -22.5% vs a year earlier — the company has been reducing its share count.
- Listing: Nasdaq · industry: Finance Services.
ZSTK market data (last 20 sessions)
| Date | Open | High | Low | Close | Volume |
|---|---|---|---|---|---|
| Oct 19, 2026 | 3.90 | 4.00 | 3.83 | 3.89 | 8.07K |
| Oct 16, 2026 | 4.22 | 4.25 | 4.00 | 4.00 | 41.90K |
| Oct 15, 2026 | 4.00 | 4.35 | 4.00 | 4.22 | 35.40K |
| Oct 14, 2026 | 4.37 | 4.37 | 3.93 | 4.05 | 23.20K |
| Oct 13, 2026 | 4.57 | 4.57 | 4.17 | 4.37 | 8.50K |
| Oct 12, 2026 | 4.53 | 4.53 | 4.33 | 4.37 | 24.20K |
| Oct 9, 2026 | 4.67 | 4.72 | 4.51 | 4.62 | 9.40K |
| Oct 8, 2026 | 4.67 | 4.74 | 4.38 | 4.64 | 20.10K |
| Oct 7, 2026 | 4.83 | 4.93 | 4.75 | 4.77 | 10.40K |
| Oct 6, 2026 | 4.74 | 4.76 | 4.55 | 4.75 | 17.70K |
| Oct 5, 2026 | 4.80 | 4.98 | 4.68 | 4.82 | 27.40K |
| Oct 2, 2026 | 4.89 | 4.92 | 4.56 | 4.86 | 17.40K |
| Oct 1, 2026 | 4.62 | 4.90 | 4.57 | 4.84 | 18.20K |
| Sep 30, 2026 | 4.94 | 4.95 | 4.57 | 4.81 | 60.80K |
| Sep 29, 2026 | 4.32 | 5.01 | 4.28 | 4.84 | 98.70K |
| Sep 28, 2026 | 4.01 | 4.29 | 4.00 | 4.24 | 27.20K |
| Sep 25, 2026 | 4.19 | 4.19 | 3.91 | 4.07 | 31.70K |
| Sep 24, 2026 | 3.89 | 4.08 | 3.82 | 3.99 | 49.10K |
| Sep 23, 2026 | 3.98 | 4.26 | 3.91 | 3.92 | 87.70K |
| Sep 22, 2026 | 4.49 | 4.49 | 4.00 | 4.05 | 175.30K |
About ZeroStack
ZeroStack (ZSTK) is listed on the Nasdaq and classified by the SEC under “Finance Services”. Its business address is in DALLAS, TX. State of incorporation: TX. Fiscal year ends December 31. SEC CIK 1790169.
ZSTK board of directors & executives
From SEC Form 3/4/5 insider filings made in the last 12 months (date = latest filing).
Directors
| Name | Role | Latest filing |
|---|---|---|
| Michael John Brown | Director | Oct 23, 2025 |
| Michael Heinrich | Executive Chairman | Jul 20, 2026 |
| Manfred Leventhal | Director | May 7, 2026 |
| Daniel Reis-Faria | CEO | Jul 20, 2026 |
| Edward Woo | Director | May 7, 2026 |
| Laurence Zeifman | Director | May 7, 2026 |
Executive officers
| Name | Title | Latest filing |
|---|---|---|
| Michael Heinrich | Executive Chairman | Jul 20, 2026 |
| Daniel Reis-Faria | CEO | Jul 20, 2026 |
| Rudy Rong | President | Aug 21, 2026 |
| Dany Vaiman | CFO | Jul 20, 2026 |
Recent insider buys & sales
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Aug 19, 2026 | Rudy Rong | Sale | 1,000 | $7.57 |
| Aug 19, 2026 | Rudy Rong | Sale | 1,000 | $7.57 |
| Aug 19, 2026 | Rudy Rong | Sale | 1,000 | $7.57 |
| Aug 19, 2026 | Rudy Rong | Sale | 1,000 | $7.57 |
| Jul 20, 2026 | Michael Heinrich | Buy | 4,608,575 | $0.75 |
| Jul 20, 2026 | Michael Heinrich | Buy | 4,608,575 | $0.75 |
| Jul 20, 2026 | Michael Heinrich | Buy | 4,608,575 | $0.75 |
| Jul 20, 2026 | Michael Heinrich | Buy | 4,608,575 | $0.75 |
ZSTK financials (annual, from XBRL filings)
| Fiscal year end | Revenue | Net income | Diluted EPS | Operating cash flow |
|---|---|---|---|---|
| Dec 31, 2025 | $35.68M | — | -43.49 | $-8.68M |
| Dec 31, 2024 | $35.87M | $-15.91M | -50.02 | $-5.03M |
| Dec 31, 2023 | $76.07M | $-57.04M | -7.75 | $-8.40M |
| Dec 31, 2022 | $33.40M | $-52.41M | -13.68 | $-15.94M |
| Dec 31, 2021 | $8.98M | $-21.36M | — | $-20.94M |
Latest balance sheet: total assets $25.19M, total liabilities $11.37M, cash $2.64M (as of Jun 30, 2026).
ZSTK earnings / results-day log
| Date | Filing | Close that day |
|---|---|---|
| Aug 10, 2023 | 8-K Item 2.02 (results) | — |
| May 15, 2023 | 8-K Item 2.02 (results) | — |
| Mar 31, 2023 | 8-K Item 2.02 (results) | — |
Related stocks · Finance Services
Strategy (MSTR)Iren (IREN)Coinbase Global (COIN)Nu (NU)American Express (AXP)Circle Internet (CRCL)Bitmine Immersion Technologies (BMNR)SoFi Technologies (SOFI)Cipher Digital (CIFR)Hut 8 (HUT)
Popular today
Spdr S&P 500 Etf (SPY)Micron Technology (MU)Nvidia (NVDA)Meta Platforms (META)Sandisk (SNDK)Tesla (TSLA)Space Exploration Technologies (SPCX)Apple (AAPL)AMD (AMD)Microsoft (MSFT)Intel (INTC)Amazon (AMZN)
More on ZSTK
Information only, not investment advice. BuyMeWhiskey is not a registered investment adviser or broker-dealer; nothing here is a recommendation to buy, sell or hold any security, and there are no price targets. Data comes from SEC EDGAR filings and public end-of-day market data and may be delayed or contain errors. Verify with the company's filings before making decisions. Prices: end-of-day data as of Oct 19, 2026, 4:00 PM ET. Filings: SEC EDGAR. Refreshed every 2 hours during US market hours.