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 | |
|---|---|---|---|---|---|---|
|
ZNTE
1751
CALL
DELISTED
Zanite Acquisition Corp. Class A Common Stock
ZNTE
| $2.8M | ﹤0.01% |
278,800
+274,565
| +6,483% | +$2.76M |
|
1752
CALL
OptimizeRx
OPRX
$117M
| $2.8M | ﹤0.01% |
45,200
+44,888
| +14,387% | +$2.28M |
|
1753
PUT
Tootsie Roll Industries
TR
$2.82B
| $2.8M | ﹤0.01% |
95,670
+94,471
| +7,879% | +$2.66M |
|
|
RDS.A
1754
DELISTED
Royal Dutch Shell PLC ADS Class A
RDS.A
| $2.8M | ﹤0.01% |
69,240
-55,290
| -44% | -$2.2M |
|
|
JMIA
1755
Jumia Technologies
JMIA
$726M
| $2.8M | ﹤0.01% |
92,213
-42,309
| -31% | -$1.28M |
|
1756
PUT
STMicroelectronics
STM
$46B
| $2.79M | ﹤0.01% |
76,800
+75,497
| +5,794% | +$2.82M |
|
|
SWAV
1757
CALL
DELISTED
Shockwave Medical, Inc. Common Stock
SWAV
| $2.79M | ﹤0.01% |
14,700
+14,628
| +20,317% | +$2.39M |
|
|
NLSN
1758
CALL
DELISTED
Nielsen Holdings plc
NLSN
| $2.79M | ﹤0.01% |
113,000
+112,777
| +50,573% | +$2.94M |
|
1759
MongoDB
MDB
$24B
| $2.79M | ﹤0.01% |
7,709
+2,519
| +49% | +$779K |
|
1760
Invesco S&P 500 Equal Weight ETF
RSP
$96.1B
| $2.79M | ﹤0.01% |
18,488
+3,547
| +24% | +$528K |
|
1761
PUT
HDFC Bank
HDB
$119B
| $2.79M | ﹤0.01% |
76,200
+74,970
| +6,095% | +$2.75M |
|
1762
PUT
Martin Marietta Materials
MLM
$33.6B
| $2.78M | ﹤0.01% |
7,900
+7,785
| +6,770% | +$2.77M |
|
|
RAPT
1763
CALL
DELISTED
RAPT Therapeutics
RAPT
| $2.78M | ﹤0.01% |
10,925
+10,919
| +181,983% | +$2.04M |
|
1764
CALL
Virtu Financial
VIRT
$5.2B
| $2.78M | ﹤0.01% |
100,500
+99,988
| +19,529% | +$2.97M |
|
|
GMS
1765
CALL
DELISTED
GMS Inc
GMS
| $2.77M | ﹤0.01% |
57,600
+56,891
| +8,024% | +$2.53M |
|
1766
CALL
Nutrien
NTR
$32.7B
| $2.77M | ﹤0.01% |
45,700
+44,764
| +4,782% | +$2.65M |
|
1767
DexCom
DXCM
$27.6B
| $2.77M | ﹤0.01% |
+25,932
| New | +$2.49M |
|
1768
CALL
Flowers Foods
FLO
$1.64B
| $2.77M | ﹤0.01% |
114,400
+114,288
| +102,043% | +$2.78M |
|
1769
CALL
Citizens Financial Group
CFG
$30.4B
| $2.77M | ﹤0.01% |
60,300
+59,733
| +10,535% | +$2.82M |
|
1770
CALL
e.l.f. Beauty
ELF
$4.56B
| $2.76M | ﹤0.01% |
101,800
+101,390
| +24,729% | +$2.9M |
|
1771
PUT
National Beverage
FIZZ
$2.87B
| $2.76M | ﹤0.01% |
+58,500
| New | +$2.84M |
|
1772
PUT
Norfolk Southern
NSC
$78.8B
| $2.76M | ﹤0.01% |
10,400
+9,987
| +2,418% | +$2.76M |
|
1773
Direxion Daily MSCI Emerging Markets Bull 3X ETF
EDC
$147M
| $2.76M | ﹤0.01% |
25,706
+15,432
| +150% | +$1.59M |
|
1774
CALL
Vanguard Emerging Markets Government Bond ETF
VWOB
$6.15B
| $2.75M | ﹤0.01% |
26,300
+26,083
| +12,020% | +$2.06M |
|
1775
PUT
Banco Bradesco
BBD
$38.1B
| $2.75M | ﹤0.01% |
590,977
+588,425
| +23,057% | +$2.56M |
|
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.