BY
Herseth Mary Jo S., BY's Director, spent $9.2K of their own money on 300 shares at $31, growing their stake 2%.
+$9.2K
300 sh @ $31
HERSETH MARY JO S.
Director · SEC CIK 1772766
Insider at
BY BYLINE BANCORP, INC.
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Buy track record
How this insider's open-market purchases have performed100%
of buys now in profit
14 up · 0 down
Avg return since buy+70.4%
Median return+73.0%
Best trade+106.2%
Worst trade+16.3%
Buys scored14
Average return by holding period — separates good entry timing from riding one long winner
After 1 month
−0.8%
43% won · 14 trades
After 3 months
−0.7%
46% won · 13 trades
After 6 months
+6.7%
69% won · 13 trades
After 12 months
+9.5%
58% won · 12 trades
| Date | Company | 90d trend | Buy price | Value | ΔOwn | 1M | 3M | 6M | 12M | To date |
|---|---|---|---|---|---|---|---|---|---|---|
| Mar 16, 2026 | BY | $31 | $9.2K | +1.6% | +8.4% | — | — | — | +16.3% | |
| Jun 13, 2025 | BY | $25 | $50.7K | +12% | +12.8% | +14.5% | +23.0% | — | +42.5% | |
| Mar 6, 2025 | BY | $27 | $7.3K | +1.7% | −12.0% | −3.1% | +8.8% | +14.7% | +32.3% | |
| Feb 7, 2024 | BY | $20 | $10.7K | +3.3% | +3.2% | +13.9% | +25.4% | +47.4% | +79.2% | |
| Nov 3, 2023 | BY | $20 | $21K | +7.1% | +7.1% | +4.5% | +16.7% | +33.9% | +83.4% | |
| Aug 11, 2023 | BY | $22 | $26K | +8.7% | −6.8% | −11.3% | −2.8% | +14.7% | +66.8% | |
| May 2, 2023 | BY | $18 | $11K | +4.7% | +5.1% | +20.9% | +9.5% | +28.5% | +106.2% | |
| Mar 14, 2023 | BY | $21 | $14.6K | +5.7% | −2.9% | −5.0% | +1.3% | +1.2% | +82.5% | |
| Mar 9, 2023 | BY | $23 | $13.4K | +5.1% | −11.1% | −15.8% | −8.7% | −5.9% | +63.4% | |
| Aug 3, 2022 | BY | $23 | $25.1K | +10% | −6.6% | −1.5% | +13.6% | −3.0% | +64.6% | |
| Aug 12, 2021 | BY | $26 | $51.1K | +26% | −9.7% | +5.7% | +5.5% | −3.8% | +48.1% | |
| Feb 10, 2021 | BY | $19 | $86.5K | +141% | +15.4% | +22.2% | +34.7% | +45.5% | +104.3% | |
| Jan 31, 2020 | BY | $20 | $19.8K | +44% | −7.8% | −42.0% | −32.5% | −13.4% | +101.2% | |
| May 7, 2019 | BY | $20 | $44.9K | NEW | −6.8% | −12.4% | −6.8% | −46.1% | +94.7% |
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 14 scored trades, treat this as a small sample, not a verdict.
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Open-market buys
$391.3K
14 trades
Open-market sells
$0
0 trades
Net flow
+$391.3K
Net buying
Total filings
16
transactions shown
Full transaction history
All Form 4 activity across every company, newest firstBY
+$0
18,500 sh
BY
Herseth Mary Jo S., BY's Director, spent $50.7K of their own money on 2,000 shares at $25, growing their stake 12%.
+$50.7K
2,000 sh @ $25
BY
Herseth Mary Jo S., BY's Director, spent $7.3K of their own money on 268 shares at $27, growing their stake 2%.
+$7.3K
268 sh @ $27
BY
Herseth Mary Jo S., BY's Director, spent $10.7K of their own money on 525 shares at $20, growing their stake 3%.
+$10.7K
525 sh @ $20
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BY
Herseth Mary Jo S., BY's Director, spent $21K of their own money on 1,040 shares at $20, growing their stake 7%.
+$21K
1,040 sh @ $20
BY
Herseth Mary Jo S., BY's Director, spent $26K of their own money on 1,175 shares at $22, growing their stake 9%.
+$26K
1,175 sh @ $22
BY
Herseth Mary Jo S., BY's Director, spent $11K of their own money on 600 shares at $18, growing their stake 5%.
+$11K
600 sh @ $18
BY
Herseth Mary Jo S., BY's Director, spent $14.6K of their own money on 700 shares at $21, growing their stake 6%.
+$14.6K
700 sh @ $21
BY
Herseth Mary Jo S., BY's Director, spent $13.4K of their own money on 590 shares at $23, growing their stake 5%.
+$13.4K
590 sh @ $23
BY
Herseth Mary Jo S., BY's Director, spent $25.1K of their own money on 1,100 shares at $23, growing their stake 10%.
+$25.1K
1,100 sh @ $23
BY
+$0
248 sh
BY
Herseth Mary Jo S., BY's Director, spent $51.1K of their own money on 2,000 shares at $26, growing their stake 26%.
+$51.1K
2,000 sh @ $26
BY
Herseth Mary Jo S., BY's Director, spent $86.5K of their own money on 4,575 shares at $19, growing their stake 141%.
+$86.5K
4,575 sh @ $19
BY
Herseth Mary Jo S., BY's Director, spent $19.8K of their own money on 1,000 shares at $20, growing their stake 44%.
+$19.8K
1,000 sh @ $20
BY
Herseth Mary Jo S., BY's Director, spent $44.9K of their own money on 2,250 shares at $20, opening a brand-new position.
+$44.9K
2,250 sh @ $20
Frequently asked questions
How is HERSETH MARY JO S.'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 HERSETH MARY JO S.'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.