Institutional Manager · CIK 0001350290
Portolan Capital Management, LLC
Boston, MA · File #028-11602
Latest AUM
$1.87B
Positions
155
Top-10 Concentration
38.4%
Filings
9
Portfolio Value Over Time
2024-03
2024-06
2024-09
2024-12
2025-03
2025-06
2025-09
2025-12
Biggest QoQ Changes
Ranked by conviction flow (share change × current price) so mark-to-market moves don't dominate. Price effect column shows how much of the $ change was just the stock moving.
| Action | Issuer | Ticker / CUSIP | Δ Shares | Flow ($) | Price Effect |
|---|---|---|---|---|---|
| REDUCE | DIGITALBRIDGE GROUP INC | DBRG-PJ | -4,643,280 | -$71.2M | +$19.9M |
| NEW | AKAMAI TECHNOLOGIES INC | AKAM | +524,321 | +$45.7M | $0 |
| ADD | BAIDU INC | BAIDF | +259,101 | +$33.9M | -$5,084 |
| REDUCE | CELESTICA INC | CLS | -79,281 | -$23.4M | +$12.4M |
| REDUCE | KRATOS DEFENSE &SEC SOLUTIO | 50077B207 | -302,100 | -$22.9M | -$9.2M |
| REDUCE | E L F BEAUTY INC | ELF | -295,203 | -$22.4M | -$27.5M |
| REDUCE | POWELL INDS INC | 739128106 | -69,129 | -$22.0M | +$2.1M |
| EXITED | WOLVERINE WORLD WIDE INC | 978097103 | -796,627 | -$21.9M | $0 |
| REDUCE | TOWER SEMICONDUCTOR LTD | TSEM | -178,780 | -$21.0M | +$14.8M |
| REDUCE | CELLEBRITE DI LTD | CLBT | -1,132,375 | -$20.4M | -$1.2M |
Sector Allocation
Filing History
- 13F HOLDINGS REPORTQ/E Dec 2025155 pos · $1.87B
- 13F HOLDINGS REPORTQ/E Sep 2025119 pos · $1.85B
- 13F HOLDINGS REPORTQ/E Jun 2025118 pos · $1.59B
- 13F HOLDINGS REPORTQ/E Mar 2025109 pos · $1.32B
- 13F HOLDINGS REPORTQ/E Dec 2024131 pos · $1.49B
- 13F HOLDINGS REPORTQ/E Sep 2024129 pos · $1.38B
- 13F HOLDINGS REPORTQ/E Jun 2024117 pos · $1.21B
- 13F HOLDINGS REPORTQ/E Mar 2024116 pos · $1.31B
- 13F HOLDINGS REPORTQ/E Dec 2023123 pos · $1.07B
Top 20 Holdings — Dec 2025
| # | Issuer | Ticker | Shares | Value | % of Portfolio |
|---|---|---|---|---|---|
| 1 | TTM TECHNOLOGIES INC | TTMI | 1,146,682 | $79.1M | 6.17% |
| 2 | MODINE MFG CO | 607828100 | 535,947 | $71.6M | 5.58% |
| 3 | CASTLE BIOSCIENCES INC | CSTL | 1,729,463 | $67.3M | 5.25% |
| 4 | CELESTICA INC | CLS | 172,275 | $50.9M | 3.97% |
| 5 | AKAMAI TECHNOLOGIES INC | AKAM | 524,321 | $45.7M | 3.57% |
| 6 | THE REAL BROKERAGE INC | 75585H206 | 10,779,843 | $39.3M | 3.07% |
| 7 | SEMTECH CORP | SMTC | 508,655 | $37.5M | 2.92% |
| 8 | BAIDU INC | BAIDF | 263,681 | $34.5M | 2.69% |
| 9 | VISHAY PRECISION GROUP INC | VPG | 877,669 | $33.8M | 2.64% |
| 10 | GENIUS SPORTS LIMITED | GENI | 2,938,119 | $32.4M | 2.53% |
| 11 | LANTHEUS HLDGS INC | LNTH | 475,789 | $31.7M | 2.47% |
| 12 | SHIFT4 PMTS INC | 82452J109 | 468,063 | $29.5M | 2.30% |
| 13 | QUANTERIX CORP | QTRX | 4,525,553 | $28.8M | 2.25% |
| 14 | FLEX LTD | FLEX | 466,913 | $28.2M | 2.20% |
| 15 | TALEN ENERGY CORP | TLN | 74,984 | $28.1M | 2.19% |
| 16 | CANADA GOOSE HLDGS INC | GOOS | 2,138,904 | $27.7M | 2.16% |
| 17 | WARBY PARKER INC | WRBY | 1,232,173 | $26.8M | 2.09% |
| 18 | ZETA GLOBAL HOLDINGS CORP | ZETA | 1,318,797 | $26.8M | 2.09% |
| 19 | POWELL INDS INC | 739128106 | 79,116 | $25.2M | 1.97% |
| 20 | LIGHTPATH TECHNOLOGIES INC | LPTH | 2,332,184 | $25.2M | 1.96% |