Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
AMC Entertainment Holdings
AMC
|
+$39.3M |
| 2 |
AT&T
T
|
+$29.8M |
| 3 |
NVIDIA
NVDA
|
+$28.3M |
| 4 |
Micron Technology
MU
|
+$22.9M |
| 5 |
Baidu
BIDU
|
+$22.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$36.1M |
| 2 |
Tesla
TSLA
|
+$35.2M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$25.9M |
| 4 |
Palantir
PLTR
|
+$25.7M |
| 5 |
Wells Fargo
WFC
|
+$20.4M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.47% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.26% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
GLDD
5126
PUT
DELISTED
Great Lakes Dredge & Dock
GLDD
| $277K | ﹤0.01% |
+19,000
| New | +$281K |
|
5127
PUT
Webster Financial
WBS
$12.5B
| $277K | ﹤0.01% |
5,200
+5,180
| +25,900% | +$287K |
|
5128
PUT
Core Laboratories
CLB
$477M
| $276K | ﹤0.01% |
7,100
+7,094
| +118,233% | +$254K |
|
|
ELME
5129
Elme Communities
ELME
$144M
| $276K | ﹤0.01% |
12,001
+10,157
| +551% | +$239K |
|
5130
CALL
Northern Oil and Gas
NOG
$2.27B
| $276K | ﹤0.01% |
+13,300
| New | +$217K |
|
5131
SL Green Realty
SLG
$3.81B
| $276K | ﹤0.01% |
3,461
+3,361
| +3,361% | +$255K |
|
5132
CALL
ReWalk Robotics
LFWD
$19.7M
| $276K | ﹤0.01% |
1,949
+1,929
| +9,645% | +$301K |
|
5133
CALL
Assured Guaranty
AGO
$3.73B
| $275K | ﹤0.01% |
5,800
+5,613
| +3,002% | +$263K |
|
5134
WisdomTree Japan Hedged Equity Fund
DXJ
$7.13B
| $275K | ﹤0.01% |
4,519
-8,375
| -65% | -$510K |
|
5135
PUT
Northwest Bancshares
NWBI
$2.3B
| $275K | ﹤0.01% |
20,200
+20,119
| +24,838% | +$284K |
|
|
SGMO
5136
DELISTED
SANGAMO THERAPEUTICS INC
SGMO
| $275K | ﹤0.01% |
22,994
+8,248
| +56% | +$93.4K |
|
5137
PUT
Unisys
UIS
$230M
| $275K | ﹤0.01% |
10,900
+10,774
| +8,551% | +$272K |
|
5138
Upbound Group
UPBD
$1.17B
| $275K | ﹤0.01% |
5,193
+2,039
| +65% | +$118K |
|
|
BDSI
5139
CALL
DELISTED
BioDelivery Sciences International, Inc.
BDSI
| $275K | ﹤0.01% |
76,900
+76,627
| +28,068% | +$270K |
|
5140
SPX Corp
SPXC
$9.98B
| $274K | ﹤0.01% |
4,500
+3,064
| +213% | +$186K |
|
5141
PUT
TriplePoint Venture Growth BDC
TPVG
$185M
| $274K | ﹤0.01% |
18,100
+17,940
| +11,213% | +$276K |
|
5142
PUT
TransUnion
TRU
$15.4B
| $274K | ﹤0.01% |
+2,500
| New | +$261K |
|
5143
CALL
TherapeuticsMD
TXMD
$23.5M
| $274K | ﹤0.01% |
+4,610
| New | +$279K |
|
|
SAFM
5144
DELISTED
Sanderson Farms Inc
SAFM
| $274K | ﹤0.01% |
1,462
-1,354
| -48% | -$228K |
|
|
HTGCR
5145
PUT
DELISTED
HERCULES TECHNOLOGY GROWTH CAP INC TRANS RGTS TO PUR COM STK
HTGCR
| $274K | ﹤0.01% |
16,100
+15,778
| +4,900% | +$269K |
|
5146
CALL
Gildan
GIL
$9.72B
| $273K | ﹤0.01% |
7,400
+7,073
| +2,163% | +$247K |
|
5147
CALL
Hilton Grand Vacations
HGV
$3.64B
| $273K | ﹤0.01% |
6,600
+6,599
| +659,900% | +$287K |
|
5148
LGI Homes
LGIH
$1.33B
| $273K | ﹤0.01% |
1,691
+629
| +59% | +$104K |
|
5149
CALL
Impinj
PI
$4.49B
| $273K | ﹤0.01% |
5,300
+5,251
| +10,716% | +$270K |
|
5150
CALL
Verastem
VSTM
$536M
| $273K | ﹤0.01% |
5,592
+5,530
| +8,919% | +$231K |
|
Similar funds
Simplex Trading's Q2 2021 Portfolio in Review
As of Q2 2021, Simplex Trading held 11,184 positions worth $104B, up 86% from $55.7B the previous quarter. Its ten largest holdings account for 40% of the portfolio.
Simplex Trading deployed $97.5B of net new capital in Q2 2021, opening 2,250 new positions and adding to 6,673 existing holdings. Its largest new stake was AT&T: 1,311,180 shares worth $28.5M.
By sector, the portfolio is most concentrated in Technology at 0.47% of assets, down from 0.65% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, an estimated $25.9M trimmed.
- Simplex Trading's largest Q2 2021 buy was AT&T: 1,311,180 shares worth $28.5M.
- Simplex Trading added most to AMC Entertainment Holdings in Q2 2021, an estimated $39.3M increase.
- Simplex Trading's biggest Q2 2021 reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, cutting an estimated $25.9M.
- Simplex Trading fully exited Invesco QQQ Trust in Q2 2021, selling an estimated $36.1M.
- Simplex Trading's ten largest holdings make up 40% of its $104B portfolio in Q2 2021.
- Simplex Trading opened 2,250 new positions and closed 1,197 in Q2 2021.
- Simplex Trading's portfolio value rose 86% quarter-over-quarter to $104B.
Based on Simplex Trading's 13F filing for Q2 2021, filed 12 Aug 2021.