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 | |
|---|---|---|---|---|---|---|
4851
PUT
ATI
ATI
$24.3B
| $323K | ﹤0.01% |
15,500
+15,327
| +8,860% | +$351K |
|
4852
Lexicon Pharmaceuticals
LXRX
$1.03B
| $323K | ﹤0.01% |
70,413
+44,739
| +174% | +$215K |
|
4853
PUT
Teekay Tankers
TNK
$2.71B
| $323K | ﹤0.01% |
22,400
+21,950
| +4,878% | +$314K |
|
|
TSE
4854
DELISTED
Trinseo
TSE
| $323K | ﹤0.01% |
+5,401
| New | +$345K |
|
|
EB
4855
DELISTED
Eventbrite
EB
| $322K | ﹤0.01% |
+16,999
| New | +$360K |
|
|
MTLS
4856
PUT
Materialise
MTLS
$366M
| $322K | ﹤0.01% |
13,400
+13,355
| +29,678% | +$374K |
|
4857
PUT
Public Service Enterprise Group
PEG
$38.7B
| $322K | ﹤0.01% |
5,400
+5,374
| +20,669% | +$332K |
|
4858
PUT
Principal Financial Group
PFG
$24.3B
| $322K | ﹤0.01% |
5,100
+4,569
| +860% | +$292K |
|
|
SOHU
4859
Sohu.com
SOHU
$352M
| $322K | ﹤0.01% |
17,337
+13,627
| +367% | +$243K |
|
|
VLRS
4860
PUT
Controladora Vuela Compania de Aviacion
VLRS
$869M
| $322K | ﹤0.01% |
16,800
+16,580
| +7,536% | +$282K |
|
|
MRNS
4861
CALL
DELISTED
Marinus Pharmaceuticals, Inc
MRNS
| $322K | ﹤0.01% |
18,000
+17,685
| +5,614% | +$284K |
|
|
SFT
4862
DELISTED
Shift Technologies, Inc. Class A Common Stock
SFT
| $322K | ﹤0.01% |
3,758
-515
| -12% | -$41.2K |
|
|
MILE
4863
PUT
DELISTED
Metromile, Inc. Common Stock
MILE
| $322K | ﹤0.01% |
35,300
+34,352
| +3,624% | +$308K |
|
4864
PUT
Enova International
ENVA
$6.09B
| $321K | ﹤0.01% |
9,400
+9,282
| +7,866% | +$327K |
|
4865
Rogers Communications
RCI
$18.8B
| $321K | ﹤0.01% |
6,057
+4,493
| +287% | +$227K |
|
|
SNP
4866
DELISTED
CHINA PETROLEUM & CHEMICAL CORPORATION ADS (REP 100 ORDINARY H SHARES)
SNP
| $321K | ﹤0.01% |
+6,300
| New | +$333K |
|
|
REV
4867
PUT
DELISTED
Revlon, Inc.
REV
| $321K | ﹤0.01% |
+25,000
| New | +$314K |
|
4868
CALL
Jacobs Solutions
J
$16B
| $320K | ﹤0.01% |
2,902
+2,872
| +9,573% | +$325K |
|
4869
AutoZone
AZO
$51.3B
| $319K | ﹤0.01% |
214
+159
| +289% | +$230K |
|
4870
CALL
BJ's Restaurants
BJRI
$1.47B
| $319K | ﹤0.01% |
6,500
+6,271
| +2,738% | +$347K |
|
4871
IAMGOLD
IAG
$8.05B
| $319K | ﹤0.01% |
108,283
+45,857
| +73% | +$154K |
|
4872
PUT
Kura Oncology
KURA
$793M
| $319K | ﹤0.01% |
15,300
+15,219
| +18,789% | +$378K |
|
4873
Magnolia Oil & Gas
MGY
$5.93B
| $319K | ﹤0.01% |
+20,433
| New | +$262K |
|
|
KIN
4874
PUT
DELISTED
Kindred Biosciences, Inc.
KIN
| $319K | ﹤0.01% |
34,800
+34,428
| +9,255% | +$200K |
|
4875
PUT
Clearfield
CLFD
$401M
| $318K | ﹤0.01% |
8,500
+8,469
| +27,319% | +$301K |
|
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.