Chipmos Technologies Inc (Nasdaq: IMOS), an SEC filer in Semiconductors & Related Devices, closed at $55.46, -3.6%, on 2026-08-28. Institutional ownership, earnings history and filed financials are on the tabs below.
% of shares outstanding not shown: this line files 20-F annual reports only — a foreign private issuer whose US listing trades as ADSs (depositary receipts), while its cover-page share count is in ORDINARY shares. The depositary ratio is not in our data. The count we hold for this line is 699,983,126 shares (as of 2025-12-31, source dei). Dividing one by the other is wrong by the whole ratio (a 5:1 ADR reads one fifth of the true percentage), so the percentage is withheld rather than served wrong. Holder share counts are shown as filed.
Crowding percentile lands with its cohort — the cohort is size-matched, so it needs a market cap for IMOS in the served universe — that lands with the next screener build.
| # | Holder | Shares | Value | % of shares out | Δ QoQ |
|---|---|---|---|---|---|
| 1 | RENAISSANCE TECHNOLOGIES LLC | 1,117,9901.1M | $40M | — | — |
| 2 | BlackRock, Inc. | 254,326254,326 | $9M | — | ADD 4% |
| 3 | ACADIAN ASSET MANAGEMENT LLC | 225,521225,521 | $8M | — | TRIM -11% |
| 4 | DIMENSIONAL FUND ADVISORS LP | 92,25492,254 | $3M | — | — |
| 5 | O'SHAUGHNESSY ASSET MANAGEMENT, LLC | 79,72379,723 | $3M | — | NEW |
| 6 | Vanguard Personalized Indexing Management, LLC | 68,71068,710 | $2M | — | TRIM -6% |
| 7 | ENVESTNET ASSET MANAGEMENT INC | 54,73954,739 | $2M | — | NEW |
| 8 | Creative Planning | 44,82944,829 | $2M | — | ADD 7% |
| 9 | RENAISSANCE GROUP LLC | 35,18035,180 | $1M | — | TRIM -3% |
| 10 | MARSHALL WACE, LLP | 32,60332,603 | $1M | — | NEW |
Ranked by each filer’s own reported value, not shares.
| Biggest buyers | Δ shares | Δ value | |
|---|---|---|---|
| O'SHAUGHNESSY ASSET MANAGEMENT, LLC | +79,723 | $3M | OPEN |
| ENVESTNET ASSET MANAGEMENT INC | +54,739 | $2M | OPEN |
| MARSHALL WACE, LLP | +32,603 | $1M | OPEN |
| TWO SIGMA INVESTMENTS, LP | +30,221 | $1M | OPEN |
| Quadrature Capital Ltd | +19,933 | $713,203 | OPEN |
| Biggest sellers | Δ shares | Δ value | |
|---|---|---|---|
| GOLDMAN SACHS GROUP INC | −27,965 | $1M | CLOSE |
| ACADIAN ASSET MANAGEMENT LLC | −27,731 | $992,215 | TRIM |
| UBS Group AG | −18,367 | $657,171 | TRIM |
| RBF Capital, LLC | −17,930 | $641,535 | CLOSE |
| XY Capital Ltd | −10,596 | $379,125 | CLOSE |
Prior quarter split-rebased · 13Fs are long, US-listed only.
| Holder | 2024-Q4 | 2025-Q1 | 2025-Q2 | 2025-Q3 | 2025-Q4 | 2026-Q1 | Latest value |
|---|---|---|---|---|---|---|---|
| RENAISSANCE TECHNOLOGIES LLC | 1.2M | 1.2M | 1.2M | 1.1M | 1.1M | 1.1M | $40M |
| BlackRock, Inc. | 214K | 188K | 248K | 247K | 245K | 254K | $9M |
| ACADIAN ASSET MANAGEMENT LLC | 219K | 251K | 265K | 265K | 253K | 226K | $8M |
| DIMENSIONAL FUND ADVISORS LP | 96K | 97K | 94K | 92K | 92K | 92K | $3M |
| O'SHAUGHNESSY ASSET MANAGEMENT, LLC | 37K | 26K | — | — | — | 80K | $3M |
| Vanguard Personalized Indexing Management, LLC | 38K | 42K | 69K | 71K | 73K | 69K | $2M |
| ENVESTNET ASSET MANAGEMENT INC | 41K | 56K | 57K | 28K | — | 55K | $2M |
| Creative Planning | 30K | 30K | 45K | 43K | 42K | 45K | $2M |
| RENAISSANCE GROUP LLC | 99K | 101K | 90K | 51K | 36K | 35K | $1M |
| MARSHALL WACE, LLP | — | — | — | — | — | 33K | $1M |
Green = added, red = trimmed, grey = held; a dash is a quarter with no 13F on file — a gap, not an exit.
Holders only — breaks = no 13F.
Short interest has its own tab now — open SI →
SEC Form 13F · ~10,250 filers, 10y · long-only, US-listed, filed ≤45d after quarter-end.
