Comparable stake leader
RENAISSANCE TECHNOLOGIES LLC
SEC ownership of CHIPMOS TECHNOLOGIES INC
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001123134.
Disclosed value leader
RENAISSANCE TECHNOLOGIES LLC
Comparable rows
0/50
Latest evidence
31 Mar 2026
- Public ticker
- IMOS on Nasdaq
- Parsed ownership sources
-
13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
RENAISSANCE TECHNOLOGIES LLC
Ranking: Comparable ownership first, then disclosed value
- Latest parsed ownership date
-
31 Mar 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001123134
- Issuer location
- Taiwan, Taiwan
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
1 signal
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of CHIPMOS TECHNOLOGIES INC (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
RENAISSANCE TECHNOLOGIES LLC
Disclosed value leader
RENAISSANCE TECHNOLOGIES LLC
Comparable rows
0/50
Latest evidence
31 Mar 2026
13F
Highest disclosed value: $40,001,682
50 rows are not safely comparable across share classes.
Showing 1-8 of 50 holder rows.
Quick read
RENAISSANCE TECHNOLOGIES LLC has the largest disclosed position value at $40M.
0 of 50 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 RENAISSANCE TECHNOLOGIES LLC's linked filing trail.
Disclosed position value
Top 5
RENAISSANCE TECHNOLOGIES LLC
$40M
BlackRock, Inc.
$9.1M
ACADIAN ASSET MANAGEMENT LLC
$8.06M
DIMENSIONAL FUND ADVISORS LP
$3.3M
O'SHAUGHNESSY ASSET MANAGEMENT, LLC
$2.85M
Value bars compare disclosed positions; verify each figure against the linked filing evidence.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| RENAISSANCE TECHNOLOGIES LLC |
13F
Company
|
—
class O/S missing
|
$40,001,682
1,117,990 shares
|
— | 31 Mar 2026 |
| BlackRock, Inc. |
13F
Company
|
—
class O/S missing
|
$9,099,784
254,326 shares
|
— | 31 Mar 2026 |
| ACADIAN ASSET MANAGEMENT LLC |
13F
Company
|
—
class O/S missing
|
$8,056,000
225,521 shares
|
— | 31 Mar 2026 |
| DIMENSIONAL FUND ADVISORS LP |
13F
Company
|
—
class O/S missing
|
$3,300,720
92,254 shares
|
— | 31 Mar 2026 |
| O'SHAUGHNESSY ASSET MANAGEMENT, LLC |
13F
Company
|
—
class O/S missing
|
$2,852,489
79,723 shares
|
— | 31 Mar 2026 |
| Vanguard Personalized Indexing Management, LLC |
13F
Company
|
—
class O/S missing
|
$2,458,444
68,710 shares
|
— | 31 Mar 2026 |
| ENVESTNET ASSET MANAGEMENT INC |
13F
Company
|
—
class O/S missing
|
$1,958,558
54,739 shares
|
— | 31 Mar 2026 |
| Creative Planning |
13F
Company
|
—
class O/S missing
|
$1,603,982
44,829 shares
|
— | 31 Mar 2026 |
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.
Forms 3/4/5 flow
Insider trading overview
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 27 Jun 2025.
Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-11 of 11 reporting-owner rows connected to CHIPMOS TECHNOLOGIES INC. Open a relationship link for the CIK-to-CIK filing trail.
Rows
11
Largest Forms 3/4/5 holder
Kun-Yi Chien
Net 12M change
$0
Latest report
16 Mar 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Kun-Yi Chien | Director | Mixed | 13 Mar 2026 | |||
| Pao-Hsin Chang | Director | Mixed | 13 Mar 2026 | |||
| Yu-Chiao Su | Vice President, Director | Mixed | 13 Mar 2026 | |||
| Yeong-Her Wang | Director | Mixed | 13 Mar 2026 | |||
| Jyh-Chau Wang | Director | Mixed | 13 Mar 2026 | |||
| Yuh-Fong Tang | Director | Mixed | 13 Mar 2026 | |||
| Teng-Yueh Tsai | Executive Vice President | Mixed | 13 Mar 2026 | |||
| Hong-Tzer Yang | Director | Mixed | 13 Mar 2026 | |||
| Yuan-Feng Hsu | Executive Vice President | Mixed | 13 Mar 2026 | |||
| Lin Fu-Chen | Director | Mixed | 13 Mar 2026 | |||
| Shih Jye Cheng | President, Director | Mixed | 16 Mar 2026 |
Recent insider transactions for CHIPMOS TECHNOLOGIES INC
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Shih Jye Cheng | IMOS | Common Stock | 0 | 1,000,000 | 16 Mar 2026 | By Spouse | ||||
| Shih Jye Cheng | IMOS | Common Stock | 0 | 6,244,777 | 16 Mar 2026 | By Hao Hsiang Investment Co., Ltd. | ||||
| Shih Jye Cheng | IMOS | Common Stock | 0 | 5,160,161 | 16 Mar 2026 | Direct | ||||
| Yuan-Feng Hsu | IMOS | Common Stock | 0 | 230,130 | 13 Mar 2026 | Direct | ||||
| Teng-Yueh Tsai | IMOS | Common Stock | 0 | 820,000 | 13 Mar 2026 | Yung Hsiang Investment Co., Ltd. | ||||
| Teng-Yueh Tsai | IMOS | Common Stock | 0 | 272,572 | 13 Mar 2026 | Direct | ||||
| Yu-Chiao Su | IMOS | Common Stock | 0 | 830,000 | 13 Mar 2026 | Tsai Fu Investment Co., Ltd. | ||||
| Yu-Chiao Su | IMOS | Common Stock | 0 | 346,101 | 13 Mar 2026 | Direct |
* marks a reported price that did not pass the local price check.