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 | |
|---|---|---|---|---|---|---|
8801
CALL
Adecoagro
AGRO
$1.53B
| $15K | ﹤0.01% |
1,500
+1,426
| +1,927% | +$14.2K |
|
|
OSG
8802
Octave Specialty Group
OSG
$252M
| $15K | ﹤0.01% |
960
-13,557
| -93% | -$218K |
|
8803
PUT
AnaptysBio
ANAB
$1.6B
| $15K | ﹤0.01% |
600
+57
| +10% | +$1.37K |
|
8804
CALL
American Resources Corp
AREC
$186M
| $15K | ﹤0.01% |
+6,200
| New | +$18.7K |
|
8805
PUT
AtriCure
ATRC
$1.77B
| $15K | ﹤0.01% |
200
+198
| +9,900% | +$14.4K |
|
8806
Aveanna Healthcare
AVAH
$2.06B
| $15K | ﹤0.01% |
+1,235
| New | +$14.6K |
|
8807
CALL
Burford Capital
BUR
$907M
| $15K | ﹤0.01% |
1,500
+1,383
| +1,182% | +$15.8K |
|
8808
Dine Brands
DIN
$432M
| $15K | ﹤0.01% |
+175
| New | +$16.2K |
|
8809
PUT
Diodes
DIOD
$4B
| $15K | ﹤0.01% |
200
+198
| +9,900% | +$15.2K |
|
|
DRRX
8810
CALL
DELISTED
DURECT Corp
DRRX
| $15K | ﹤0.01% |
940
+937
| +31,233% | +$16.3K |
|
8811
Entergy
ETR
$54.1B
| $15K | ﹤0.01% |
+308
| New | +$16.2K |
|
8812
CALL
National Vision
EYE
$1.6B
| $15K | ﹤0.01% |
300
+117
| +64% | +$5.74K |
|
8813
CALL
FirstCash
FCFS
$8.55B
| $15K | ﹤0.01% |
200
+199
| +19,900% | +$15.1K |
|
8814
Garrett Motion
GTX
$5.9B
| $15K | ﹤0.01% |
+1,892
| New | +$13.9K |
|
|
8815
PUT
Garrett Motion
GTX
$5.9B
| $15K | ﹤0.01% |
+1,900
| New | +$14K |
|
8816
Direxion Daily S&P 500 High Beta Bear 3X ETF
HIBS
$24.6M
| $15K | ﹤0.01% |
13
+8
| +160% | +$10.1K |
|
8817
PUT
KBR
KBR
$4.68B
| $15K | ﹤0.01% |
400
+333
| +497% | +$13.2K |
|
8818
CALL
Kosmos Energy
KOS
$1.56B
| $15K | ﹤0.01% |
+4,600
| New | +$14.3K |
|
8819
CALL
Materion
MTRN
$5.01B
| $15K | ﹤0.01% |
+200
| New | +$14.8K |
|
|
MYND
8820
Mynd.ai
MYND
$17.6M
| $15K | ﹤0.01% |
352
+199
| +130% | +$6.86K |
|
8821
CALL
Nautilus Biotechnolgy
NAUT
$215M
| $15K | ﹤0.01% |
1,500
+1,392
| +1,289% | +$15.1K |
|
8822
PUT
News Corp Class B
NWS
$16.4B
| $15K | ﹤0.01% |
600
+534
| +809% | +$13.2K |
|
8823
CALL
Phio Pharmaceuticals
PHIO
$12.1M
| $15K | ﹤0.01% |
63
+60
| +2,000% | +$14.8K |
|
8824
PUT
POSCO
PKX
$15.8B
| $15K | ﹤0.01% |
200
+195
| +3,900% | +$15.4K |
|
8825
Cartesian Therapeutics
RNAC
$232M
| $15K | ﹤0.01% |
126
-1,667
| -93% | -$199K |
|
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.