ZSTK ZeroStack (ZSTK) Insider Trading, Ownership & Congress Trades
Wholesale & Retail · Wholesale-drugs, proprietaries & druggists' sundries · CIK 0001790169
C-suite buying · 1
House members buying, 1 year
0
STOCK Act, US House only, disclosed up to 45 days after the trade
Funds added, last quarter
4
13F, latest reported quarter
What the filings say about ZSTK
Insiders, 180 days
+$3.5M net bought
1 buyer · 1 seller · 0% of sales under a 10b5-1 plan
ZeroStack insider trades (Form 4)
Form 4 buys and sells (codes P and S). Grants, option exercises
and conversions excluded.
Over the last 180 days, ZeroStack Corp. insiders bought a net $3.5M of stock across 2 Form 4 purchases and sales, with 1 insider buying. Source: SEC Form 4 filings, as of 2026-10-28.
Insider
Filed
Shares
Value
Since filing
Context
- First Form 4 purchase or sale (code P or S) here by this insider on our record.
- No other insider sold within 30 days.
- 4 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: President Rong Rudy sold about $7.6K of ZSTK on Aug 19, 2026, the largest insider sale at the company on our record; 4 funds added in the latest 13F quarter.Context
- First Form 4 purchase or sale (code P or S) here by this insider on our record.
- The trade is 100.0% of the 4,608,575 shares held after it.
- No other insider bought within 30 days.
- 4 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Executive Chairman Heinrich Michael bought about $3.5M of ZSTK on Jul 20, 2026, the largest insider purchase at the company on our record; 4 funds added in the latest 13F quarter.2 transactions on record · a thin record, read with care
Since filing: total return from the first close after the filing to the latest close, dividend-adjusted. Not a forecast.
Context lines are counts over the filings above and returns from our own price history, never a price level. Not investment advice.
Seven facts, ranked against the sector ·
Rank is not a forecast
Insiders
net +$3.5M over 180 days
-$7.6K over 90 days
more than 94% of Wholesale & Retail
Congress
no House purchase disclosed in the last 12 months
Funds
4 funds bought in last quarter
below 94% of Wholesale & Retail
Revenue
-0.5% year over year
below 65% of Wholesale & Retail
Margin
-335.6% net margin
below 97% of Wholesale & Retail
Buybacks
no share repurchases reported
Short interest
1.1% of the float short (float per yahoo 2026-10-27) · 3.7 days to cover · settled 2026-10-15
below 75% of Wholesale & Retail
What changed in the last 30 days
Nothing new filed in the last 30 days
Watch ZSTK
A free account keeps a watchlist and can send one email a day when insiders, funds or Congress file on the names in it. No password and no card.
The year, with the filings on it
Total return over 12 months. Each marker is a filing; hover or tap one for the detail.
-78.2%12M
Insider buyInsider sell
Indexed to 100, dividend-adjusted, not a price chart.
When a name files heavily, the largest trades are drawn first.
Who owns ZSTK: institutional holders (13F)
13F holdings, latest reported quarter
25,440 sh
$76.3K
20,994 sh
$63.0K
12,648 sh
$37.9K
1,730 sh
$5.2K
440 sh
$1.3K
Congress trades in ZSTK
No Congress trades reported
No House member has disclosed a trade in this stock. See what Congress is buying.
Activist and 5% holders (13D/13G)
No 5%+ ownership filings
Nobody has filed for crossing 5%. That is a fact, not missing data.
ZSTK planned insider sales (Form 144)
No planned-sale notices
No insider has filed to sell. Watch this after a run-up.
ZSTK mutual fund holders (N-PORT)
Funds ranked by the share of their own portfolio in this stock (N-PORT).
Fidelity Extended Market Index Fund
$76.4K position · as of 2026-05-31
0.0%
VANGUARD EXTENDED MARKET INDEX FUND
$76.3K position · as of 2026-06-30
0.0%
Fidelity Series Total Market Index Fund
$10.3K position · as of 2026-05-31
0.0%
Fidelity Nasdaq Composite Index Fund
$1.9K position · as of 2026-05-31
0.0%
Fidelity Total Market Index Fund
$6.7K position · as of 2026-05-31
0.0%
SEC N-PORT, monthly, about 60 days late · funds ≥ $10M ·
% is the share of the fund's own portfolio
Live price
Daily candles from TradingView, under their licence. No filings marked.
Why this name is on the desk
Insiders are net buyers of their own stock.
The record shows a net $3.5M bought by insiders over 180 days, 4 funds added last quarter. Each figure is a federal filing, dated the day it went public.
ZSTK financials
Revenue growth
-0.5%
XBRL, annual
Net margin
-335.6%
Ratios from the company's XBRL filings, latest filings
Revenue, TTM
n/a
the filed year and its quarters do not reconcile, so the trailing figure is withheld
Revenue, TTM ZSTK
| FY Dec 2025 | n/a |
| FY Dec 2024 | $59.5M |
| FY Dec 2023 | n/a |
| FY Dec 2022 | n/a |
| FY Dec 2021 | n/a |
| Jun 2026 | $13.7M |
| Mar 2026 | $7.3M |
| Dec 2025 | $9.4M |
| Sep 2025 | $9.7M |
| Jun 2025 | $14.8M |
| Mar 2025 | $11.8M |
| Dec 2024 | $13.3M |
| Sep 2024 | $12.5M |
At each fiscal year end
Single quarter
Net margin, TTM
n/a
the filed year and its quarters do not reconcile, so the trailing figure is withheld
Net margin, TTM ZSTK
| FY Dec 2025 | n/a |
| FY Dec 2024 | -26.7% |
| FY Dec 2023 | n/a |
| FY Dec 2022 | n/a |
| FY Dec 2021 | n/a |
| Jun 2026 | -180.2% |
| Mar 2026 | -504.0% |
| Dec 2025 | -1,175% |
| Sep 2025 | -68.3% |
| Jun 2025 | -16.3% |
| Mar 2025 | -6.4% |
| Dec 2024 | -46.0% |
| Sep 2024 | -30.3% |
At each fiscal year end
Single quarter
Free cash flow, TTM
-$5.6M
operating cash flow minus capex, 2025-07-01 to 2026-06-30
Free cash flow, TTM ZSTK
| FY Dec 2025 | -$8.8M |
| FY Dec 2024 | -$5.2M |
| FY Dec 2023 | -$8.6M |
| FY Dec 2022 | -$17.2M |
| FY Dec 2021 | n/a |
| Jun 2026 | $1.4M |
| Mar 2026 | -$3.8M |
| Dec 2025 | -$3.2M |
| Sep 2025 | $24.0K |
| Jun 2025 | -$3.0M |
| Mar 2025 | -$2.7M |
| Dec 2024 | -$1.3M |
| Sep 2024 | -$2.1M |
At each fiscal year end
Single quarter
Debt to equity
0.17x
long-term 2026-06-30 plus current 2026-06-30; equity 2026-06-30
Debt to equity ZSTK
| FY Dec 2025 | 0.76x |
| FY Dec 2024 | 0.46x |
| FY Dec 2023 | 0.30x |
| FY Dec 2022 | 0.02x |
| FY Dec 2021 | 0.00x |
| Jun 2026 | 0.17x |
| Mar 2026 | 0.09x |
| Dec 2025 | 0.76x |
| Sep 2025 | 0.04x |
| Jun 2025 | 0.77x |
| Mar 2025 | 0.52x |
| Dec 2024 | 0.46x |
| Sep 2024 | 0.53x |
At each fiscal year end
Trailing four quarters at each quarter end
Cash flow to debt
-2.32x
TTM operating cash flow over long-term 2026-06-30 plus current 2026-06-30
Cash flow to debt ZSTK
| FY Dec 2025 | -0.16x |
| FY Dec 2024 | -2.42x |
| FY Dec 2023 | -4.35x |
| FY Dec 2022 | -14.67x |
| FY Dec 2021 | n/a |
| Jun 2026 | -2.32x |
| Mar 2026 | -3.12x |
| Dec 2025 | -0.16x |
| Sep 2025 | -2.49x |
| Jun 2025 | -2.91x |
| Mar 2025 | -2.56x |
| Dec 2024 | -2.42x |
| Sep 2024 | -2.16x |
At each fiscal year end
Trailing four quarters at each quarter end
Return on equity
-1,994%
TTM net income over average of 2025-06-30 and 2026-06-30
Return on equity ZSTK
| FY Dec 2025 | -319.0% |
| FY Dec 2024 | -291.5% |
| FY Dec 2023 | -180.4% |
| FY Dec 2022 | -78.4% |
| FY Dec 2021 | n/a |
| Jun 2026 | -1,994% |
| Mar 2026 | -749.1% |
| Dec 2025 | -319.0% |
| Sep 2025 | -46.1% |
| Jun 2025 | -230.7% |
| Mar 2025 | -336.7% |
| Dec 2024 | -291.5% |
| Sep 2024 | -214.1% |
At each fiscal year end
Trailing four quarters at each quarter end
Return on assets
-743.2%
TTM net income over average of 2025-06-30 and 2026-06-30
Return on assets ZSTK
| FY Dec 2025 | -153.0% |
| FY Dec 2024 | -63.8% |
| FY Dec 2023 | -109.0% |
| FY Dec 2022 | -63.1% |
| FY Dec 2021 | n/a |
| Jun 2026 | -743.2% |
| Mar 2026 | -460.6% |
| Dec 2025 | -153.0% |
| Sep 2025 | -30.9% |
| Jun 2025 | -49.6% |
| Mar 2025 | -57.0% |
| Dec 2024 | -63.8% |
| Sep 2024 | -65.3% |
At each fiscal year end
Trailing four quarters at each quarter end
Return on invested capital
n/a
the filed year and its quarters do not reconcile, so the trailing figure is withheld
Return on invested capital ZSTK
| FY Dec 2025 | n/a |
| FY Dec 2024 | n/a |
| FY Dec 2023 | n/a |
| FY Dec 2022 | n/a |
| FY Dec 2021 | n/a |
| Jun 2026 | n/a |
| Mar 2026 | n/a |
| Dec 2025 | n/a |
| Sep 2025 | n/a |
| Jun 2025 | n/a |
| Mar 2025 | n/a |
| Dec 2024 | n/a |
| Sep 2024 | n/a |
At each fiscal year end
Trailing four quarters at each quarter end
Return on capital employed
n/a
the filed year and its quarters do not reconcile, so the trailing figure is withheld
Return on capital employed ZSTK
| FY Dec 2025 | n/a |
| FY Dec 2024 | n/a |
| FY Dec 2023 | -142.1% |
| FY Dec 2022 | n/a |
| FY Dec 2021 | n/a |
| Jun 2026 | n/a |
| Mar 2026 | n/a |
| Dec 2025 | n/a |
| Sep 2025 | n/a |
| Jun 2025 | n/a |
| Mar 2025 | n/a |
| Dec 2024 | n/a |
| Sep 2024 | -132.6% |
At each fiscal year end
Trailing four quarters at each quarter end
P/E, trailing
n/a
trailing loss, a multiple of a loss is not meaningful
P/E, trailing ZSTK
| FY Dec 2025 | n/a |
| FY Dec 2024 | n/a |
| FY Dec 2023 | n/a |
| FY Dec 2022 | n/a |
| FY Dec 2021 | n/a |
| Jun 2026 | n/a |
| Mar 2026 | n/a |
| Dec 2025 | n/a |
| Sep 2025 | n/a |
| Jun 2025 | n/a |
| Mar 2025 | n/a |
| Dec 2024 | n/a |
| Sep 2024 | n/a |
At each fiscal year end
Trailing four quarters at each quarter end
Enterprise value
$52.6M
market value at close 2026-10-27 on 2026-07-27 shares, plus long-term 2026-06-30 plus current 2026-06-30, minus cash 2026-06-30
Enterprise value ZSTK
| FY Dec 2025 | $52.5M |
| FY Dec 2024 | $533.8M |
| FY Dec 2023 | $429.8M |
| FY Dec 2022 | $11.6B |
| FY Dec 2021 | $90.9B |
| Jun 2026 | $7.1M |
| Mar 2026 | $16.2M |
| Dec 2025 | $52.5M |
| Sep 2025 | $379.4M |
| Jun 2025 | $512.1M |
| Mar 2025 | $457.4M |
| Dec 2024 | $533.8M |
| Sep 2024 | $795.6M |
At each fiscal year end
Trailing four quarters at each quarter end
FCF yield
-10.7%
TTM free cash flow over market value at close 2026-10-27
FCF yield ZSTK
| FY Dec 2025 | -189.7% |
| FY Dec 2024 | -1.0% |
| FY Dec 2023 | -2.0% |
| FY Dec 2022 | -0.1% |
| FY Dec 2021 | n/a |
| Jun 2026 | -77.3% |
| Mar 2026 | -66.3% |
| Dec 2025 | -189.7% |
| Sep 2025 | -1.8% |
| Jun 2025 | -1.8% |
| Mar 2025 | -1.4% |
| Dec 2024 | -1.0% |
| Sep 2024 | -0.6% |
At each fiscal year end
Trailing four quarters at each quarter end
PEG, trailing
n/a
trailing loss, a multiple of a loss is not meaningful
PEG, trailing ZSTK
| FY Dec 2025 | n/a |
| FY Dec 2024 | n/a |
| FY Dec 2023 | n/a |
| FY Dec 2022 | n/a |
| FY Dec 2021 | n/a |
| Jun 2026 | n/a |
| Mar 2026 | n/a |
| Dec 2025 | n/a |
| Sep 2025 | n/a |
| Jun 2025 | n/a |
| Mar 2025 | n/a |
| Dec 2024 | n/a |
| Sep 2024 | n/a |
At each fiscal year end
Trailing four quarters at each quarter end
Price as of 2026-10-27. Hover or tap a tile for its yearly and quarterly history.
Method
TTM is four consecutive fiscal quarters; Q4 is the year minus nine months when not filed. Returns use the average of opening and closing balances. EBIT is approximated by operating income. PEG uses trailing EPS growth.
Fundamentals
Annual figures from XBRL filings. Pick a past date to see them as known then.
| 2025-12 | 2024-12 | 2023-12 | 2022-12 | |
|---|---|---|---|---|
| Revenue | $35.7M | $59.5M | $76.1M | $37.2M |
| Gross profit | $1.6M | $2.2M | $17.7M | $13.3M |
| Operating income | -$154.7M | -$8.9M | -$50.4M | -$47.2M |
| Net income | -$119.7M | -$15.9M | -$57.0M | -$52.4M |
| EPS (diluted) | -43.49 | -50.02 | -7.75 | -13.68 |
| Operating cash flow | -$8.7M | -$5.0M | -$8.4M | -$15.9M |
| Cash | $5.6M | $5.2M | $4.3M | $8.9M |
| Long-term debt | $50.8M | $0 | n/a | n/a |
| Buybacks | n/a | n/a | $0 | $255.0K |
SEC XBRL, fiscal years, as known on 2026-10-28
ZSTK Stock Sonar score 6/7 axes
Find similar shapesCompareZSTK ranks highest on insider conviction (77th percentile) and risk and compliance (40th), and lowest on profitability (1st), among Wholesale & Retail peers.
6 of 7 axes scored. Each is a percentile against sector peers (all companies when the sector is thin); higher is better. An unscored axis is unmeasured, not low. How it is scored
ZSTK filings, in plain words
Are ZeroStack insiders buying or selling ZSTK?
In the 180 days to 2026-10-28, ZeroStack insiders were net buyers, a net $3.5M: $3.5M of purchases and $7.6K of sales reported on Form 4, by 1 buyer and 1 seller.
Read the full summary
In the 180 days to 2026-10-28, ZeroStack insiders were net buyers of ZSTK, a net $3.5M across purchases and sales reported on Form 4 by 1 buyer and 1 seller. Purchases outweighed sales more than tenfold by value. Each figure is counted from SEC and House filings as of 2026-10-28, dated the day the filing was made public.
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