Security key
002121101
- Security type / class
- Equity / Common
- Total 13F shares
- 49,835,808
- Total 13F value
- $353,314,409
- Share change
- +2,884,616
- SEC-reported price per share
- $7.09
- Number of holders
- 109
- Value change
- +$20,826,634
- Number of buys
- 71
- Number of sells
- 33
- Shares outstanding
- 71,994,925
Holder snapshot
6 signals
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q1 2019
Institutions
109
Top holders
10
ATEN full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q2 2026
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 (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 2018
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
6.8%
BlackRock Finance, Inc.
6.5%
ALLIANCEBERNSTEIN L.P.
5.3%
VANGUARD GROUP INC
4.3%
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%
|
$59,233,000
9,492,417 shares
|
— | 31 Dec 2018 |
| VIEX Capital Advisors, LLC |
13F
Company
|
6.8%
|
$30,459,000
4,881,326 shares
|
— | 31 Dec 2018 |
| BlackRock Finance, Inc. |
13F
Company
|
6.5%
|
$29,377,000
4,707,826 shares
|
— | 31 Dec 2018 |
| ALLIANCEBERNSTEIN L.P. |
13F
Company
|
5.3%
|
$23,660,000
3,791,644 shares
|
— | 31 Dec 2018 |
| VANGUARD GROUP INC |
13F
Company
|
4.3%
|
$19,295,000
3,092,215 shares
|
— | 31 Dec 2018 |
| Divisar Capital Management LLC |
13F
Company
|
3.5%
|
$15,886,000
2,545,780 shares
|
— | 31 Dec 2018 |
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 2019
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
109
Shares
49,835,808
Rows available
109
| 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 2019 vs Q1 2019 Across Filers
Q1 2019 holders
109
Q1 2019 holders
109
Holder diff
0
| Investor | Q1 2019 Shares | Q1 2019 Shares | Share Diff | Share Chg % | Q1 2019 value | Q1 2019 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend