Security key
002121101
- Security type / class
- Equity / Common Stock
- Total 13F shares
- 65,708,350
- Total 13F value
- $630,499,637
- Share change
- +3,024,247
- Put/Call ratio
- 42%
- SEC-reported price per share
- $9.61
- Number of holders
- 133
- Value change
- +$28,739,618
- Number of buys
- 66
- Number of sells
- 81
- Shares outstanding
- 71,754,597
Holder snapshot
7 signals
Open additional details 1 more signal available
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q1 2021
Institutions
133
Top holders
10
ATEN full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q2 2021
Previous quarter: Q4 2020
A10 Networks, Inc. SEC filings
A10 Networks, Inc. company facts
Broader feeds
Reporting periods
Holder history for CUSIP 002121101
Recent filing periods:
Ownership snapshot
Top reported holders of ATEN - A10 Networks, Inc. - Common Stock (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
SUMMIT PARTNERS L P
Disclosed value leader
SUMMIT PARTNERS L P
Comparable rows
15/15
Latest evidence
31 Dec 2020
13F
Lead comparable stake: 13%
Showing 1-6 of 15 holder rows.
Quick read
SUMMIT PARTNERS L P leads the comparable SEC ownership view at 13%.
15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens SUMMIT PARTNERS L P's linked filing trail.
Comparable ownership
Top 5
SUMMIT PARTNERS L P
13%
VIEX Capital Advisors, LLC
11%
BlackRock Finance, Inc.
7.7%
VANGUARD GROUP INC
6.1%
Legal & General Group Plc
5.7%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| SUMMIT PARTNERS L P |
13F
Company
|
13%
|
$94,055,000
9,539,076 shares
|
— | 31 Dec 2020 |
| VIEX Capital Advisors, LLC |
13F
Company
|
11%
|
$75,834,000
7,691,096 shares
|
— | 31 Dec 2020 |
| BlackRock Finance, Inc. |
13F
Company
|
7.7%
|
$54,531,000
5,530,552 shares
|
— | 31 Dec 2020 |
| VANGUARD GROUP INC |
13F
Company
|
6.1%
|
$43,037,000
4,364,807 shares
|
— | 31 Dec 2020 |
| Legal & General Group Plc |
13F
Company
|
5.7%
|
$40,131,000
4,070,056 shares
|
— | 31 Dec 2020 |
| RENAISSANCE TECHNOLOGIES LLC |
13F
Company
|
5.4%
|
$38,395,000
3,893,972 shares
|
— | 31 Dec 2020 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q1 2021
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
133
Shares
65,708,350
Rows available
133
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q1 2021 vs Q4 2020 Across Filers
Q4 2020 holders
144
Q1 2021 holders
133
Holder diff
-11
| Investor | Q4 2020 Shares | Q1 2021 Shares | Share Diff | Share Chg % | Q4 2020 value | Q1 2021 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend