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 | |
|---|---|---|---|---|---|---|
2176
PUT
Dine Brands
DIN
$432M
| $1.97M | ﹤0.01% |
22,100
+22,067
| +66,870% | +$2.04M |
|
2177
ArcelorMittal
MT
$50.4B
| $1.97M | ﹤0.01% |
63,495
+63,484
| +577,127% | +$1.97M |
|
2178
CALL
LendingTree
TREE
$544M
| $1.97M | ﹤0.01% |
9,300
+9,220
| +11,525% | +$1.94M |
|
2179
EOG Resources
EOG
$78B
| $1.97M | ﹤0.01% |
23,579
-41,383
| -64% | -$3.27M |
|
2180
PUT
American Well
AMWL
$181M
| $1.96M | ﹤0.01% |
7,800
+7,730
| +11,043% | +$2.23M |
|
2181
PUT
PG&E
PCG
$47.8B
| $1.96M | ﹤0.01% |
192,900
+189,222
| +5,145% | +$2.03M |
|
|
ARNC
2182
CALL
DELISTED
Arconic Corporation
ARNC
| $1.96M | ﹤0.01% |
55,000
+54,428
| +9,515% | +$1.8M |
|
2183
Zillow
Z
$7.04B
| $1.96M | ﹤0.01% |
16,012
-4,697
| -23% | -$572K |
|
2184
PUT
The GEO Group
GEO
$4.13B
| $1.96M | ﹤0.01% |
274,600
+272,723
| +14,530% | +$1.72M |
|
|
ACIC
2185
CALL
DELISTED
Atlas Crest Investment Corp.
ACIC
| $1.95M | ﹤0.01% |
+196,100
| New | +$1.95M |
|
2186
CALL
UGI
UGI
$8B
| $1.95M | ﹤0.01% |
42,100
+41,914
| +22,534% | +$1.89M |
|
|
SAND
2187
CALL
DELISTED
Sandstorm Gold
SAND
| $1.95M | ﹤0.01% |
246,800
+244,600
| +11,118% | +$1.98M |
|
|
TRTN
2188
CALL
DELISTED
Triton International Limited
TRTN
| $1.95M | ﹤0.01% |
37,200
+37,033
| +22,175% | +$1.96M |
|
|
AMRS
2189
DELISTED
Amyris Inc.
AMRS
| $1.95M | ﹤0.01% |
118,959
+6,928
| +6% | +$103K |
|
2190
CALL
Acuity Brands
AYI
$9.88B
| $1.95M | ﹤0.01% |
10,400
+10,389
| +94,445% | +$1.89M |
|
|
SRTA
2191
CALL
Strata Critical Medical Inc
SRTA
$436M
| $1.94M | ﹤0.01% |
185,200
+182,277
| +6,236% | +$1.8M |
|
2192
CALL
GoodRx Holdings
GDRX
$1B
| $1.94M | ﹤0.01% |
54,000
+53,306
| +7,681% | +$1.97M |
|
2193
iShares US Home Construction ETF
ITB
$2.41B
| $1.94M | ﹤0.01% |
28,095
-1,635
| -5% | -$116K |
|
2194
CALL
Azenta
AZTA
$1.26B
| $1.94M | ﹤0.01% |
+20,400
| New | +$1.98M |
|
2195
CALL
First Horizon
FHN
$12.1B
| $1.94M | ﹤0.01% |
112,400
+110,574
| +6,056% | +$2.01M |
|
2196
US Global Jets ETF
JETS
$802M
| $1.94M | ﹤0.01% |
80,276
-48,945
| -38% | -$1.28M |
|
|
LFTR
2197
CALL
DELISTED
Lefteris Acquisition Corp. Class A Common Stock
LFTR
| $1.94M | ﹤0.01% |
199,100
+199,077
| +865,552% | +$1.95M |
|
|
EMBJ
2198
CALL
Embraer S.A. ADS
EMBJ
$11.6B
| $1.94M | ﹤0.01% |
+128,200
| New | +$1.66M |
|
2199
Elastic
ESTC
$6.1B
| $1.94M | ﹤0.01% |
13,311
+1,057
| +9% | +$132K |
|
2200
PUT
ManpowerGroup
MAN
$2.39B
| $1.94M | ﹤0.01% |
16,300
+16,276
| +67,817% | +$1.92M |
|
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.