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 | |
|---|---|---|---|---|---|---|
4751
PUT
Community Health Systems
CYH
$382M
| $342K | ﹤0.01% |
22,200
+21,926
| +8,002% | +$298K |
|
4752
CALL
Energous
WATT
$71.8M
| $342K | ﹤0.01% |
199
+197
| +9,850% | +$358K |
|
4753
CALL
Allison Transmission
ALSN
$9.51B
| $341K | ﹤0.01% |
8,600
+8,496
| +8,169% | +$361K |
|
|
FOLD
4754
CALL
DELISTED
Amicus Therapeutics
FOLD
| $341K | ﹤0.01% |
35,400
+34,737
| +5,239% | +$339K |
|
4755
PUT
Genuine Parts
GPC
$17.9B
| $341K | ﹤0.01% |
2,700
+2,562
| +1,857% | +$322K |
|
4756
CALL
Nerdy
NRDY
$108M
| $341K | ﹤0.01% |
34,400
+32,508
| +1,718% | +$329K |
|
4757
PUT
Universal Corp
UVV
$1.37B
| $341K | ﹤0.01% |
6,000
+5,990
| +59,900% | +$346K |
|
4758
CALL
Altimmune
ALT
$568M
| $340K | ﹤0.01% |
34,600
+34,290
| +11,061% | +$469K |
|
|
BCLI
4759
PUT
DELISTED
BRAINSTORM CELL THERAPUTC
BCLI
| $340K | ﹤0.01% |
5,973
+5,898
| +7,864% | +$315K |
|
|
HGEN
4760
CALL
DELISTED
HUMANIGEN, INC.
HGEN
| $340K | ﹤0.01% |
19,600
+19,155
| +4,304% | +$349K |
|
4761
CALL
Alliance Resource Partners
ARLP
$3.34B
| $339K | ﹤0.01% |
47,100
+46,813
| +16,311% | +$293K |
|
4762
PUT
Brookfield Renewable
BEP
$9.6B
| $339K | ﹤0.01% |
8,800
+8,776
| +36,567% | +$347K |
|
4763
PUT
Box
BOX
$4.49B
| $339K | ﹤0.01% |
13,300
+12,745
| +2,296% | +$297K |
|
|
ASTR
4764
DELISTED
Astra Space, Inc. Class A Common Stock
ASTR
| $339K | ﹤0.01% |
1,833
-1,462
| -44% | -$232K |
|
|
VRAY
4765
DELISTED
ViewRay, Inc.
VRAY
| $339K | ﹤0.01% |
51,372
+46,173
| +888% | +$246K |
|
4766
CALL
Amkor Technology
AMKR
$10.6B
| $338K | ﹤0.01% |
14,300
+13,604
| +1,955% | +$303K |
|
4767
Invesco BuyBack Achievers ETF
PKW
$1.72B
| $338K | ﹤0.01% |
+3,750
| New | +$333K |
|
4768
PUT
Ingles Markets
IMKTA
$1.72B
| $337K | ﹤0.01% |
5,800
+5,731
| +8,306% | +$356K |
|
4769
CALL
Arcadia Biosciences
RKDA
$1.42M
| $337K | ﹤0.01% |
2,840
+2,824
| +17,650% | +$308K |
|
4770
Retractable Technologies
RVP
$20.1M
| $337K | ﹤0.01% |
+29,212
| New | +$307K |
|
4771
Trex
TREX
$4.4B
| $337K | ﹤0.01% |
3,300
-1,507
| -31% | -$152K |
|
4772
PUT
American Financial Group
AFG
$11.9B
| $336K | ﹤0.01% |
2,700
+2,677
| +11,639% | +$335K |
|
4773
EyePoint Inc
EYPT
$999M
| $336K | ﹤0.01% |
37,477
-7,821
| -17% | -$75.1K |
|
|
SEAH
4774
DELISTED
Sports Entertainment Acquisition Corp.
SEAH
| $336K | ﹤0.01% |
33,352
+18,968
| +132% | +$192K |
|
4775
CALL
Arcturus Therapeutics
ARCT
$165M
| $335K | ﹤0.01% |
9,900
+9,790
| +8,900% | +$331K |
|
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.