OSPN
Zenner Marc, OSPN's Director, spent $34.8K of their own money on 3,300 shares at $11, growing their stake 4%.
+$34.8K
3,300 sh @ $11
Zenner Marc
Director · SEC CIK 1721547Advertisement
Buy track record
How this insider's open-market purchases have performed78%
of buys now in profit
7 up · 2 down
Avg return since buy+15.3%
Median return+15.7%
Best trade+53.9%
Worst trade−20.4%
Buys scored9 (+2 n/a)
Average return by holding period — separates good entry timing from riding one long winner
After 1 month
+3.7%
89% won · 9 trades
After 3 months
+7.7%
56% won · 9 trades
After 6 months
+8.9%
50% won · 8 trades
After 12 months
+14.6%
67% won · 6 trades
| Date | Company | 90d trend | Buy price | Value | ΔOwn | 1M | 3M | 6M | 12M | To date |
|---|---|---|---|---|---|---|---|---|---|---|
| Mar 4, 2026 | OSPN | $11 | $34.8K | +4.1% | +4.4% | +43.1% | — | — | +39.3% | |
| Nov 4, 2025 | OSPN | $12 | $24.3K | +2.8% | +4.0% | −6.3% | +1.9% | — | +23.7% | |
| Aug 8, 2025 | OSPN | $13 | $28.2K | +3.2% | +21.9% | −1.1% | −10.5% | — | +15.7% | |
| Mar 13, 2024 | OSPN | $10 | $24.7K | +4.7% | +1.5% | +32.0% | +57.7% | +56.2% | +53.9% | |
| Aug 14, 2023 | OSPN | $11 | $57.3K | +13% | +1.0% | −8.3% | −12.7% | +32.1% | +32.3% | |
| Aug 9, 2021 | OSPN | $19 | $81.7K | +23% | +1.6% | +10.6% | −13.1% | −42.9% | −20.4% | |
| Aug 9, 2021 | OSPN | $19 | $11.2K | +2.5% | +1.6% | +10.6% | −13.1% | −42.9% | −20.4% | |
| Jun 3, 2019 | OSPN | $14 | $69.6K | +100% | +2.2% | +0.4% | +35.6% | +58.4% | +12.5% | |
| May 10, 2019 | OSPN | $15 | $75K | NEW | −4.5% | −11.9% | +25.4% | +26.4% | +0.9% |
How this is calculated. We score only open-market purchases (SEC code
P) — the buys that carry real signal. Each trade's return is measured from the adjusted closing price on the purchase date to the latest close, accounting for stock splits and dividends. The 1M/3M/6M/12M columns show the same trade's return after each fixed holding period; a dash means that horizon hasn't elapsed yet or isn't priceable. Sales are excluded because insiders sell for many routine reasons. With only 9 scored trades, treat this as a small sample, not a verdict.
Advertisement
Open-market buys
$465.6K
11 trades
Open-market sells
$0
0 trades
Net flow
+$465.6K
Net buying
Total filings
22
transactions shown
Full transaction history
All Form 4 activity across every company, newest firstOSPN
+$0
6,635 sh
OSPN
Zenner Marc, OSPN's Director, spent $24.3K of their own money on 2,000 shares at $12, growing their stake 3%.
+$24.3K
2,000 sh @ $12
OSPN
Zenner Marc, OSPN's Director, spent $28.2K of their own money on 2,200 shares at $13, growing their stake 3%.
+$28.2K
2,200 sh @ $13
OSPN
+$0
12,914 sh
Advertisement
OSPN
Zenner Marc, OSPN's Director, spent $24.7K of their own money on 2,500 shares at $10, growing their stake 5%.
+$24.7K
2,500 sh @ $10
OSPN
+$0
10,823 sh
OSPN
Zenner Marc, OSPN's Director, spent $57.3K of their own money on 5,000 shares at $11, growing their stake 13%.
+$57.3K
5,000 sh @ $11
OSPN
+$0
7,618 sh
OSPN
+$100.5K
5,833 sh @ $17
OSPN
Zenner Marc, OSPN's Director, spent $81.7K of their own money on 4,400 shares at $19, growing their stake 23%.
+$81.7K
4,400 sh @ $19
OSPN
Zenner Marc, OSPN's Director, spent $11.2K of their own money on 600 shares at $19, growing their stake 3%.
+$11.2K
600 sh @ $19
OSPN
+$119.9K
5,230 sh @ $23
INWK
−$0
38,344 sh
OSPN
+$94.4K
4,155 sh @ $23
INWK
+$0
38,344 sh
INWK
Zenner Marc, INWK's Director, spent $23.5K of their own money on 25,000 shares at $1, growing their stake 41%.
+$23.5K
25,000 sh @ $1
INWK
Zenner Marc, INWK's Director, spent $35.4K of their own money on 30,000 shares at $1, growing their stake 98%.
+$35.4K
30,000 sh @ $1
INWK
+$0
30,713 sh
OSPN
+$56.9K
4,155 sh @ $14
OSPN
Zenner Marc, OSPN's Director, spent $69.6K of their own money on 5,000 shares at $14, growing their stake 100%.
+$69.6K
5,000 sh @ $14
OSPN
Zenner Marc, OSPN's Director, spent $75K of their own money on 5,000 shares at $15, opening a brand-new position.
+$75K
5,000 sh @ $15
Frequently asked questions
How is Zenner Marc's win rate calculated?
We take every open-market purchase (SEC code P) we can match to a stock price, then compare the split- and dividend-adjusted price on the purchase date to the most recent close. The win rate is the share of those buys currently trading above the purchase price. Sales and share grants are not scored.
Why are some buys not included in the score?
A purchase is excluded if we can't price it — for example if the ticker is missing from the filing, the company has been delisted, or the security isn't a common stock we can match to market data. Excluded counts are shown next to the scored total.
What do the 1M / 3M / 6M / 12M columns mean?
They show each purchase's return after a fixed holding period — one, three, six, and twelve months from the buy date — using split- and dividend-adjusted prices. This separates good entry timing from simply holding a long-running winner. A dash means that horizon hasn't elapsed yet for that trade, or the stock couldn't be priced at that date.
Does a high win rate mean I should copy this insider?
No. Past performance does not predict future results, sample sizes are often small, and an insider's edge in their own company doesn't transfer to yours. This is context, not a recommendation. InsiderSource is not investment advice.
Where does this data come from?
Trades come from Zenner Marc's SEC Form 4 filings on EDGAR. Prices come from public market data and are split/dividend-adjusted. Always verify against the original filings before acting.