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 | |
|---|---|---|---|---|---|---|
6126
Genesis Energy
GEL
$1.87B
| $150K | ﹤0.01% |
12,931
-2,126
| -14% | -$21.5K |
|
6127
Manitowoc
MTW
$497M
| $150K | ﹤0.01% |
+6,156
| New | +$147K |
|
6128
PROG Holdings
PRG
$1.75B
| $150K | ﹤0.01% |
3,132
+236
| +8% | +$11.7K |
|
|
TGNA
6129
DELISTED
TEGNA Inc
TGNA
| $150K | ﹤0.01% |
8,019
-71,362
| -90% | -$1.4M |
|
6130
PUT
VirnetX Holding Corp
VHC
$54.4M
| $150K | ﹤0.01% |
+1,770
| New | +$166K |
|
6131
XBiotech
XBIT
$68M
| $150K | ﹤0.01% |
9,075
+7,069
| +352% | +$120K |
|
|
VIRX
6132
CALL
DELISTED
Viracta Therapeutics, Inc. Common Stock
VIRX
| $150K | ﹤0.01% |
13,300
+12,845
| +2,823% | +$129K |
|
|
MRNS
6133
DELISTED
Marinus Pharmaceuticals, Inc
MRNS
| $150K | ﹤0.01% |
8,393
-164
| -2% | -$2.64K |
|
|
SI
6134
DELISTED
Silvergate Capital Corporation
SI
| $150K | ﹤0.01% |
1,325
-6,628
| -83% | -$751K |
|
|
BKEP
6135
PUT
DELISTED
Blueknight Energy Partners L.P.
BKEP
| $150K | ﹤0.01% |
+39,800
| New | +$143K |
|
|
MSGN
6136
DELISTED
MSG Networks Inc.
MSGN
| $150K | ﹤0.01% |
10,316
+6,497
| +170% | +$101K |
|
6137
PUT
DarioHealth
DRIO
$70.9M
| $149K | ﹤0.01% |
350
+349
| +34,900% | +$133K |
|
6138
PUT
Diana Shipping
DSX
$302M
| $149K | ﹤0.01% |
41,050
+40,891
| +25,718% | +$120K |
|
6139
Essential Properties Realty Trust
EPRT
$6.77B
| $149K | ﹤0.01% |
+5,511
| New | +$143K |
|
6140
iShares MSCI South Africa ETF
EZA
$547M
| $149K | ﹤0.01% |
3,066
-4,640
| -60% | -$237K |
|
|
HITI
6141
High Tide
HITI
$186M
| $149K | ﹤0.01% |
+18,716
| New | +$150K |
|
6142
PUT
Kornit Digital
KRNT
$705M
| $149K | ﹤0.01% |
1,200
+1,196
| +29,900% | +$126K |
|
6143
Invesco Aerospace & Defense ETF
PPA
$8.24B
| $149K | ﹤0.01% |
1,993
+73
| +4% | +$5.49K |
|
6144
PUT
Rayonier Advanced Materials
RYAM
$604M
| $149K | ﹤0.01% |
22,300
+21,961
| +6,478% | +$179K |
|
6145
CALL
Sterling Infrastructure
STRL
$18.3B
| $149K | ﹤0.01% |
6,200
+6,141
| +10,408% | +$137K |
|
6146
PUT
Trupanion
TRUP
$1.07B
| $149K | ﹤0.01% |
1,300
+1,289
| +11,718% | +$112K |
|
6147
Vanguard Long-Term Treasury ETF
VGLT
$10B
| $149K | ﹤0.01% |
+1,705
| New | +$145K |
|
|
ZEUS
6148
CALL
DELISTED
Olympic Steel
ZEUS
| $149K | ﹤0.01% |
5,100
+5,034
| +7,627% | +$159K |
|
|
XIFR
6149
XPLR Infrastructure LP
XIFR
$1.12B
| $149K | ﹤0.01% |
1,956
-1,494
| -43% | -$107K |
|
|
SGFY
6150
CALL
DELISTED
Signify Health, Inc.
SGFY
| $149K | ﹤0.01% |
4,900
+4,893
| +69,900% | +$135K |
|
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.