InsiderSource

CHUNG PETER Y

Director, 10% Owner · SEC CIK 1239366
Insider at MTSI MACOM Technology Solutions Holdings, Inc. ATEN A10 Networks, Inc. ESMT EngageSmart, Inc. ACIA Acacia Communications, Inc. CASA Casa Systems Inc
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Buy track record

How this insider's open-market purchases have performed
This insider has no open-market purchases in the records we parsed, so there's no buy track record to score. Their full filing history is below.
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Open-market buys
$3.25M
1 trades
Open-market sells
$512.75M
14 trades
Net flow
−$509.5M
Net selling
Total filings
43
transactions shown

Full transaction history

All Form 4 activity across every company, newest first
View on SEC EDGAR ↗
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ATEN
A10 Networks, Inc.
Sell CHUNG PETER Y · Director · Open-market sale · filed Nov 18, 2024 ΔOwn −4.4%

Chung Peter Y sold $388.6K of ATEN, trimming their stake 4%.

−$388.6K
23,754 sh @ $16
ATEN
A10 Networks, Inc.
Disposition to issuer CHUNG PETER Y · Director · Disposition to issuer · filed Nov 18, 2024 ΔOwn −64%
−$5.18M
329,566 sh @ $16
ATEN
A10 Networks, Inc.
Sell CHUNG PETER Y · Director · Open-market sale · filed Nov 15, 2024 ΔOwn −13%

Chung Peter Y sold $1.3M of ATEN, trimming their stake 13%.

−$1.3M
78,479 sh @ $17
ATEN
A10 Networks, Inc.
Sell CHUNG PETER Y · Director · Open-market sale · filed May 22, 2024 ΔOwn −84%

Chung Peter Y sold $50.76M of ATEN, trimming their stake 84%.

−$50.76M
3.3M sh @ $15
ESMT
EngageSmart, Inc.
Sell SUMMIT PARTNERS L P · 10% Owner · Open-market sale · filed Mar 7, 2023 ΔOwn −1.0%

Summit Partners L P sold $4.6M of ESMT, trimming their stake 1%.

−$4.6M
252,727 sh @ $18
ESMT
EngageSmart, Inc.
Sell SUMMIT PARTNERS L P · 10% Owner · Open-market sale · filed Mar 3, 2023 ΔOwn −6.2%

Summit Partners L P sold $30.36M of ESMT, trimming their stake 6%.

−$30.36M
1.67M sh @ $18
ATEN
A10 Networks, Inc.
Sell CHUNG PETER Y · Director · Open-market sale · filed Nov 17, 2022 ΔOwn −28%

Chung Peter Y sold $25.8M of ATEN, trimming their stake 28%.

−$25.8M
1.5M sh @ $17
ATEN
A10 Networks, Inc.
Disposition to issuer CHUNG PETER Y · Director, 10% Owner · Disposition to issuer · filed Sep 9, 2022 ΔOwn −39%
−$44.63M
3.5M sh @ $13
ATEN
A10 Networks, Inc.
Sell CHUNG PETER Y · Director, 10% Owner · Open-market sale · filed Dec 10, 2021 ΔOwn −7.3%

Chung Peter Y sold $10.54M of ATEN, trimming their stake 7%.

−$10.54M
700,000 sh @ $15

Frequently asked questions

How is CHUNG PETER Y'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 CHUNG PETER Y'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.