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 | |
|---|---|---|---|---|---|---|
|
RFP
2801
CALL
DELISTED
Resolute Forest Products Inc.
RFP
| $1.25M | ﹤0.01% |
102,200
+102,153
| +217,347% | +$1.43M |
|
2802
PUT
Alto Ingredients
ALTO
$360M
| $1.25M | ﹤0.01% |
203,900
+201,777
| +9,504% | +$1.17M |
|
2803
PUT
Penske Automotive Group
PAG
$14.3B
| $1.25M | ﹤0.01% |
16,500
+16,302
| +8,233% | +$1.36M |
|
2804
PUT
Liberty Media Series A
FWONA
$22.3B
| $1.24M | ﹤0.01% |
32,379
+32,054
| +9,863% | +$1.24M |
|
2805
CALL
PetMed Express
PETS
$42.5M
| $1.24M | ﹤0.01% |
39,000
+38,490
| +7,547% | +$1.22M |
|
|
INFN
2806
CALL
DELISTED
Infinera Corporation Common Stock
INFN
| $1.24M | ﹤0.01% |
121,800
+120,245
| +7,733% | +$1.17M |
|
|
ACIC
2807
PUT
DELISTED
Atlas Crest Investment Corp.
ACIC
| $1.24M | ﹤0.01% |
+124,600
| New | +$1.24M |
|
2808
Celldex Therapeutics
CLDX
$2.77B
| $1.24M | ﹤0.01% |
37,111
+34,565
| +1,358% | +$949K |
|
|
BZUN
2809
PUT
Baozun
BZUN
$144M
| $1.24M | ﹤0.01% |
34,900
+34,070
| +4,105% | +$1.2M |
|
|
VRE
2810
PUT
DELISTED
Veris Residential
VRE
| $1.24M | ﹤0.01% |
+72,100
| New | +$1.21M |
|
2811
PUT
Agios Pharmaceuticals
AGIO
$2.16B
| $1.23M | ﹤0.01% |
22,400
+22,070
| +6,688% | +$1.23M |
|
2812
PUT
Sundial Growers
SNDL
$325M
| $1.23M | ﹤0.01% |
130,020
+129,151
| +14,862% | +$1.18M |
|
2813
PUT
Applovin
APP
$132B
| $1.23M | ﹤0.01% |
+16,400
| New | +$1.13M |
|
2814
CALL
AMN Healthcare
AMN
$1.28B
| $1.23M | ﹤0.01% |
12,700
+12,602
| +12,859% | +$1.09M |
|
2815
PUT
Gogo Inc
GOGO
$515M
| $1.23M | ﹤0.01% |
+108,100
| New | +$1.25M |
|
2816
PUT
Halozyme
HALO
$9.72B
| $1.23M | ﹤0.01% |
+27,100
| New | +$1.2M |
|
|
SKX
2817
CALL
DELISTED
Skechers
SKX
| $1.23M | ﹤0.01% |
24,700
+24,295
| +5,999% | +$1.15M |
|
2818
CALL
American Superconductor
AMSC
$1.48B
| $1.23M | ﹤0.01% |
70,600
+70,250
| +20,071% | +$1.12M |
|
2819
CALL
WEC Energy
WEC
$37.7B
| $1.23M | ﹤0.01% |
13,800
+13,656
| +9,483% | +$1.29M |
|
|
CTEV
2820
CALL
Claritev Corp
CTEV
$368M
| $1.23M | ﹤0.01% |
3,223
+3,190
| +9,667% | +$988K |
|
|
GES
2821
PUT
DELISTED
Guess Inc
GES
| $1.22M | ﹤0.01% |
46,400
+45,817
| +7,859% | +$1.27M |
|
2822
CALL
Invesco
IVZ
$13.3B
| $1.22M | ﹤0.01% |
45,800
+44,870
| +4,825% | +$1.22M |
|
|
KYNB
2823
PUT
Kyntra Bio
KYNB
$28.5M
| $1.22M | ﹤0.01% |
1,836
+1,834
| +91,700% | +$1.06M |
|
2824
CALL
Plains GP Holdings
PAGP
$5.23B
| $1.22M | ﹤0.01% |
102,300
+100,982
| +7,662% | +$1.08M |
|
|
ELMS
2825
CALL
DELISTED
Electric Last Mile Solutions, Inc. Class A Common stock
ELMS
| $1.22M | ﹤0.01% |
121,200
+120,069
| +10,616% | +$1.2M |
|
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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.