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IRONWOOD INVESTMENT MANAGEMENT LLC — 13F Holdings & Portfolio

CIK 1127761 · latest 13F-HR filed 2026-08-14

Backtest portfolio

IRONWOOD INVESTMENT MANAGEMENT LLC manages $289.2M in 13F-reported U.S. long-equity assets across 177 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are VTI (7.23%), EFA (4.73%), VICR (3.35%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 7 new positions and exited 9; 113 existing positions rose in reported value and 33 fell.

AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.

Loading holdings…
AUM
$289.2M

Long-equity book

Holdings
177

Distinct positions

Period
2026-06-30

Filed 2026-08-14

Q/Q Activity
+7 / −9 / ↑113 / ↓33

vs 2026-03-31

Portfolio charts

Latest quarter's book, what changed, and how the portfolio has evolved across filings.

Portfolio map

Q2 26
VTI7.2% · +4%EFA4.7% · +5%VICR3.4% · -17%MYRG3.1% · 0%SHV2.6% · +5%DY2.5% · -0%TTMI2.1% · -1%EXTR1.8% · +0%IWV1.8% · +8%CYTK1.7% · -0%C1.6% · -6%BBIO1.6% · +0%MRCY1.5% · -3%VWO1.5% · +6%GPI1.5% · 0%ARW1.4% · 0%SGI1.3% · +0%ASML1.3% · -6%COHR1.2% · -26%GFF1.2% · 0%TPC1.2% · -0%PI1.2% · +2%GM1.1% · 0%SMCI1.1% · +4%CVGI1.1% · +6%ATRO1.0% · +20%WTS1.0% · 0%SAIDF0.9% · +0%BBSI0.9% · +0%KOP0.9% · -2%CSCO0.9% · 0%WSM0.9% · 0%MCK0.9% · 0%PEGA0.8% · +1%DAR0.8% · -0%NPKI0.8% · -0%IWM0.8% · -0%ONTO0.7% · +0%SM0.7% · -14%HNI0.7% · newFNV0.7% · +8%FRPT0.7% · -0%KSS0.7% · 0%THG0.7% · -0%AUPH0.7% · +0%SCHE0.7% · +32%GSHD0.7% · +90%KOPN0.6% · +0%PGY0.6% · +5%SHOO0.6% · +0%GT0.6% · +10%EVLV0.6% · +1%PRCH0.6% · +3%IBM0.6% · 0%CBT0.6% · +0%GOOGL0.6% · -15%TDY0.5% · -16%PFE0.5% · -6%ACIW0.5% · +1%BDC0.5% · 0%

Box size = position value; colour = change in share count vs the prior quarter (green added, red trimmed, blue new). Rows split across managers or share classes are combined. Click a box for the stock.

Sector mix

% of 13F value

Sectors from each company's SIC code; funds and ETFs grouped separately.

Biggest buys and sells

Q1 26 → Q2 26

Estimated from the change in shares held × the quarter-end price, so price moves alone don't count as buying. New and exited positions are included.

13F assets and positions

4 quarters

Total reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.

Top positions over time

reported value

The eight largest current positions, valued at each quarter end.

Concentration

top 10 = 30.8%

Cumulative share of the portfolio held in the largest N positions.

Firm Profile & Key People

As of the firm’s regulatory filing dated Mar 26, 2026.

Assets Under Management
$8.23B
Discretionary
$8.23B
Employees
43
Accounts
8
Address
ONE MARKET PLAZA, STEUART TOWER
SUITE 2500
SAN FRANCISCO, CA 94105
Phone
(415) 777-2400
Website
Name Title / Status Ownership Type
BOERO, MARTHA, ROSE ControlCHIEF FINANCIAL OFFICER
since Jan 2023
Less than 5%Individual
FREDERICK M. AND SHELBY M. GANS TRUST U/A/D 4/21/95 ControlOWNER
since Jan 2003
25–50%Domestic Entity
GANS, FREDERICK, MORTON ControlFOUNDER, TRUSTEE OF FREDERICK M. AND SHELBY M. GANS TRUST U/A/D 4/1/1995, CORPORATE DIRECTOR
since Jan 1996
25–50%Individual
GANS, JONATHAN, ADAM ControlCHIEF EXECUTIVE OFFICER & PRESIDENT
since Jun 1996
50–75%Individual
GANS, SHELBY, MURPHY ControlTRUSTEE OF FREDERICK M. AND SHELBY M. GANS TRUST U/A/D 4/21/95, CORPORATE DIRECTOR
since Apr 1995
25–50%Individual
HONG, SIMON, KI ControlMANAGING DIRECTOR
since Jan 2000
Less than 5%Individual
MAZUR, MICHAEL, PAUL ControlCHIEF COMPLIANCE OFFICER
since Jan 2022
Less than 5%Individual
PHILLIPS, WILLIAM, JOHN ControlMANAGING DIRECTOR
since Oct 2009
Less than 5%Individual
SANGER, ALISON, JANE ControlCHIEF OPERATING OFFICER
since Oct 2005
Less than 5%Individual
ZACK, BENJAMIN, DAVID ControlMANAGING DIRECTOR
since Jan 2010
Less than 5%Individual
Ownership & leadership changes · 9 filings with changes since Mar 27, 2012

From the firm’s regulatory filings, newest first. Dates are filing dates: a filing that no longer lists someone does not say when they left.

Oct 2, 2023 filing
  • ChangedFREDERICK M. AND SHELBY M. GANS TRUST U/A/D 4/21/95 · ownership 50–75% → 25–50%
  • ChangedGANS, FREDERICK, MORTON · ownership 50–75% → 25–50%
  • ChangedGANS, JONATHAN, ADAM · ownership 25–50% → 50–75%
  • ChangedGANS, SHELBY, MURPHY · ownership 50–75% → 25–50%
Mar 31, 2023 filing
  • ChangedFREDERICK M. AND SHELBY M. GANS TRUST U/A/D 4/21/95 · ownership 25–50% → 50–75%
  • ChangedGANS, FREDERICK, MORTON · title M. GANS TRUST U/A/D 4/21/95, CORPORATE DIRECTOR → FOUNDER, TRUSTEE OF FREDERICK M. AND SHELBY M. GANS TRUST U/A/D 4/1/1995, CORPORATE DIRECTOR; ownership 25–50% → 50–75%
  • ChangedGANS, JONATHAN, ADAM · ownership 50–75% → 25–50%
  • ChangedGANS, SHELBY, MURPHY · ownership 25–50% → 50–75%
  • ChangedHONG, SIMON, KI · title DIRECTOR → MANAGING DIRECTOR
Jan 13, 2023 filing
  • No longer listedCHATOFF, LAUREL, ANNE · CHIEF FINANCIAL OFFICER · Less than 5% · control person · listed since Oct 2011
  • AddedBOERO, MARTHA, ROSE · CHIEF FINANCIAL OFFICER · Less than 5% · control person
Mar 30, 2022 filing
  • No longer listedMONTANARI, ALANA, SUZANNE · DIRECTOR · Less than 5% · control person · listed since Dec 2018
Feb 1, 2022 filing
  • AddedMAZUR, MICHAEL, PAUL · CHIEF COMPLIANCE OFFICER · Less than 5% · control person
  • ChangedSANGER, ALISON, JANE · title CHIEF OPERATING OFFICER/CHIEF COMPLIANCE OFFICER → CHIEF OPERATING OFFICER
Jan 31, 2020 filing
  • ChangedFREDERICK M. AND SHELBY M. GANS TRUST U/A/D 4/21/95 · ownership 50–75% → 25–50%
  • ChangedGANS, FREDERICK, MORTON · ownership 50–75% → 25–50%
  • ChangedGANS, JONATHAN, ADAM · ownership 25–50% → 50–75%
  • ChangedGANS, SHELBY, MURPHY · ownership 50–75% → 25–50%
Mar 29, 2019 filing
  • AddedHONG, SIMON, KI · DIRECTOR · Less than 5% · control person
  • AddedMONTANARI, ALANA, SUZANNE · DIRECTOR · Less than 5% · control person
  • AddedPHILLIPS, WILLIAM, JOHN · MANAGING DIRECTOR · Less than 5% · control person
  • ChangedFREDERICK M. AND SHELBY M. GANS TRUST U/A/D 4/21/95 · ownership 10–25% → 50–75%
  • ChangedGANS, FREDERICK, MORTON · title FOUNDER, TRUSTEE OF FREDERICK M. AND SHELBY M. GANS TRUST U/A/D 4/21/95 → M. GANS TRUST U/A/D 4/21/95, CORPORATE DIRECTOR; ownership 10–25% → 50–75%
  • ChangedGANS, JONATHAN, ADAM · ownership 50–75% → 25–50%
  • ChangedGANS, SHELBY, MURPHY · title TRUSTEE OF FREDERICK M. AND SHELBY M. GANS TRUST U/A/D 4/21/95 → TRUSTEE OF FREDERICK M. AND SHELBY M. GANS TRUST U/A/D 4/21/95, CORPORATE DIRECTOR; ownership 10–25% → 50–75%
  • ChangedSANGER, ALISON, JANE · ownership 5–10% → Less than 5%
  • ChangedZACK, BENJAMIN, DAVID · ownership 5–10% → Less than 5%; now a control person
Mar 31, 2017 filing
  • ChangedFREDERICK M. AND SHELBY M. GANS TRUST U/A/D 4/21/95 · ownership 25–50% → 10–25%
  • ChangedGANS, FREDERICK, MORTON · title CHAIRMAN, TRUSTEE OF FREDERICK M. AND SHELBY M. GANS TRUST U/A/D 4/21/95 → FOUNDER, TRUSTEE OF FREDERICK M. AND SHELBY M. GANS TRUST U/A/D 4/21/95; ownership 25–50% → 10–25%
  • ChangedGANS, SHELBY, MURPHY · ownership 25–50% → 10–25%
  • ChangedSANGER, ALISON, JANE · ownership Less than 5% → 5–10%
  • ChangedZACK, BENJAMIN, DAVID · ownership Less than 5% → 5–10%
Mar 31, 2015 filing
  • ChangedCHATOFF, LAUREL, ANNE · title DIRECTOR OF FINANCE → CHIEF FINANCIAL OFFICER
Mar 27, 2012 filing (earliest on record)
  • ListedCHATOFF, LAUREL, ANNE · DIRECTOR OF FINANCE · Less than 5% · control person
  • ListedFREDERICK M. AND SHELBY M. GANS TRUST U/A/D 4/21/95 · OWNER · 25–50% · control person
  • ListedGANS, FREDERICK, MORTON · CHAIRMAN, TRUSTEE OF FREDERICK M. AND SHELBY M. GANS TRUST U/A/D 4/21/95 · 25–50% · control person
  • ListedGANS, JONATHAN, ADAM · CHIEF EXECUTIVE OFFICER & PRESIDENT · 50–75% · control person
  • ListedGANS, SHELBY, MURPHY · TRUSTEE OF FREDERICK M. AND SHELBY M. GANS TRUST U/A/D 4/21/95 · 25–50% · control person
  • ListedSANGER, ALISON, JANE · CHIEF OPERATING OFFICER/CHIEF COMPLIANCE OFFICER · Less than 5% · control person
  • ListedZACK, BENJAMIN, DAVID · MANAGING DIRECTOR · Less than 5%

Quarter-over-quarter changes

Changes in reported position value vs the prior 13F, so price moves count too, not just shares bought or sold.

IRONWOOD INVESTMENT MANAGEMENT LLC Holdings (2026-06-30)

Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).

# Issuer Symbol CUSIP Value Weight Shares Type
1 Vanguard Total Stock Market ET VTI 922908769 $20.9M 7.23% 56,505 SH
2 Msci Eafe EFA 464287465 $13.7M 4.73% 131,779 SH
3 Vicor Corp VICR 925815102 $9.7M 3.35% 25,507 SH
4 MYR Group MYRG 55405W104 $8.9M 3.06% 17,700 SH
5 iShares Short Treasury Bond ET SHV 464288679 $7.5M 2.59% 67,806 SH
6 Dycom Industries Inc DY 267475101 $7.1M 2.47% 14,125 SH
7 Ttm Technologies Inc TTMI 87305R109 $6.0M 2.09% 32,331 SH
8 Extreme Networks Inc. EXTR 30226D106 $5.2M 1.81% 161,853 SH
9 iShares Russell 3000 ETF IWV 464287689 $5.2M 1.79% 12,154 SH
10 Cytokinetics Inc CYTK 23282W605 $4.8M 1.67% 56,589 SH
11 Citigroup Inc New C 172967424 $4.7M 1.62% 33,462 SH
12 BridgeBio Pharma Inc. BBIO 10806X102 $4.6M 1.58% 61,163 SH
13 Mercury Systems MRCY 589378108 $4.5M 1.54% 36,457 SH
14 Vanguard FTSE Emerging Markets VWO 922042858 $4.3M 1.50% 72,554 SH
15 Group 1 Automotive GPI 398905109 $4.3M 1.47% 14,627 SH
16 Arrow Electronics ARW 042735100 $4.1M 1.42% 19,295 SH
17 Somnigroup International Inc. SGI 88023U101 $3.7M 1.28% 47,124 SH
18 ASML Holding N.V. ASML N07059210 $3.7M 1.27% 1,847 SH
19 Coherent Corp COHR 19247G107 $3.6M 1.24% 9,063 SH
20 Griffon Corp GFF 398433102 $3.4M 1.17% 34,647 SH
21 Tutor Perini Corp TPC 901109108 $3.3M 1.15% 40,160 SH
22 Impinj, Inc. PI 453204109 $3.3M 1.15% 23,262 SH
23 General Mtrs Corp GM 37045V100 $3.3M 1.13% 42,500 SH
24 Super Micro Computer, Inc. SMCI 86800U302 $3.2M 1.10% 108,638 SH
25 Commercial Vehicle Group CVGI 202608105 $3.1M 1.08% 677,040 SH
26 Watts Water Tech Inc A Class A WTS 942749102 $2.8M 0.98% 7,210 SH
27 Fidelity Total Market Index Fu SAIDF 315911693 $2.7M 0.93% 12,965 SH
28 Barrett Business Services Inc. BBSI 068463108 $2.7M 0.92% 74,741 SH
29 Koppers Holdings Inc. KOP 50060P106 $2.6M 0.90% 58,116 SH
30 Cisco Systems Inc CSCO 17275R102 $2.6M 0.90% 22,200 SH
31 Williams Sonoma WSM 969904101 $2.5M 0.88% 10,926 SH
32 Mckesson Corporation MCK 58155Q103 $2.5M 0.86% 3,305 SH
33 Astronics Corporation ATRO 046433108 $2.4M 0.83% 29,430 SH
34 Pegasystems Inc PEGA 705573103 $2.4M 0.82% 78,843 SH
35 Darling Ingredients, Inc. DAR 237266101 $2.3M 0.80% 42,464 SH
36 NPK International, Inc. NPKI 651718504 $2.2M 0.77% 140,567 SH
37 Ishares Russell 2000 IWM 464287655 $2.2M 0.75% 7,231 SH
38 Onto Innovation ONTO 683344105 $2.2M 0.74% 5,691 SH
39 Sm Energy Company SM 78454L100 $2.1M 0.74% 81,890 SH
40 HNI Corporation HNI 404251100 $2.1M 0.73% 52,031 SH
41 Franco-Nevada FNV 351858105 $2.1M 0.72% 10,018 SH
42 Freshpet Inc. FRPT 358039105 $2.1M 0.72% 35,193 SH
43 Kohls KSS 500255104 $2.0M 0.69% 112,800 SH
44 Hanover Insurance Group THG 410867105 $2.0M 0.68% 9,232 SH
45 Aurinia Pharmaceuticals AUPH 05156V102 $1.9M 0.67% 113,387 SH
46 Schwab Emerging Mrkets Equity SCHE 808524706 $1.9M 0.65% 52,159 SH
47 Goosehead Insurance Inc. GSHD 38267D109 $1.9M 0.65% 38,750 SH
48 Kopin Corporation KOPN 500600101 $1.9M 0.64% 413,323 SH
49 Pagaya Technologies Ltd. PGY M7S64L123 $1.8M 0.62% 98,735 SH
50 Steven Madden Ltd SHOO 556269108 $1.8M 0.61% 41,822 SH
Filing History
Period Filed AUM Holdings Accession
2026-06-30 2026-08-14 $289.2M 177 0001376474-26-000566
2026-03-31 2026-05-15 $239.8M 179 0001376474-26-000378
2025-12-31 2026-02-12 $237.8M 172 0001376474-26-000161
2025-09-30 2025-11-13 $229.3M 171 0001376474-25-000926
Filer Information
Address
67 BATTERYMARCH STREET,
3RD FLOOR
BOSTON, MA 02110
Phone
(617) 757-7630
Filing Manager
IRONWOOD INVESTMENT MANAGEMENT LLC
BOSTON, MA
Signatory
Shantelle Reidy
Chief Compliance Officer