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 | |
|---|---|---|---|---|---|---|
|
SJT
6726
PUT
San Juan Basin Royalty Trust
SJT
$117M
| $100K | ﹤0.01% |
19,500
+19,420
| +24,275% | +$97.4K |
|
6727
Westlake Corp
WLK
$9.03B
| $100K | ﹤0.01% |
1,112
-89
| -7% | -$8.64K |
|
|
XNET
6728
PUT
Xunlei
XNET
$340M
| $100K | ﹤0.01% |
+22,100
| New | +$113K |
|
|
MARK
6729
PUT
DELISTED
Remark Holdings, Inc.
MARK
| $100K | ﹤0.01% |
5,420
+5,338
| +6,510% | +$99.9K |
|
|
MYOV
6730
CALL
DELISTED
Myovant Sciences Ltd.
MYOV
| $100K | ﹤0.01% |
4,400
+4,156
| +1,703% | +$87.4K |
|
|
PEI
6731
DELISTED
Pennsylvania Real Estate Investment Trust
PEI
| $100K | ﹤0.01% |
2,690
-560
| -17% | -$18.3K |
|
6732
Bio-Rad Laboratories Class A
BIO
$8.71B
| $99K | ﹤0.01% |
+154
| New | +$93.7K |
|
6733
PUT
Grid Dynamics Holdings
GDYN
$576M
| $99K | ﹤0.01% |
+6,600
| New | +$103K |
|
6734
CALL
IAMGOLD
IAG
$8.2B
| $99K | ﹤0.01% |
33,700
+33,643
| +59,023% | +$113K |
|
|
INN
6735
CALL
Summit Hotel Properties
INN
$746M
| $99K | ﹤0.01% |
10,700
+10,676
| +44,483% | +$106K |
|
6736
PUT
KALA BIO
KALA
$14.1M
| $99K | ﹤0.01% |
+8
| New | +$126K |
|
6737
PUT
Lee Enterprises
LEE
$172M
| $99K | ﹤0.01% |
3,500
+3,399
| +3,365% | +$100K |
|
|
LGHL
6738
CALL
Lion Group Holding
LGHL
$853K
| – | – |
0
| – | – |
|
6739
CALL
Mustang Bio
MBIO
$4.32M
| $99K | ﹤0.01% |
+40
| New | +$98K |
|
6740
Ormat Technologies
ORA
$6B
| $99K | ﹤0.01% |
+1,430
| New | +$102K |
|
6741
CALL
SEACOR Marine Holdings
SMHI
$256M
| $99K | ﹤0.01% |
+22,600
| New | +$99.7K |
|
6742
PUT
Teekay
TK
$1.01B
| $99K | ﹤0.01% |
26,800
+26,469
| +7,997% | +$93.6K |
|
6743
CALL
CVR Partners
UAN
$1.36B
| $99K | ﹤0.01% |
1,600
+1,560
| +3,900% | +$87.4K |
|
6744
CALL
Telefônica Brasil
VIV
$20.6B
| $99K | ﹤0.01% |
11,700
+11,589
| +10,441% | +$97.3K |
|
|
AFI
6745
CALL
DELISTED
Armstrong Flooring, Inc.
AFI
| $99K | ﹤0.01% |
16,100
+15,937
| +9,777% | +$91.4K |
|
6746
PUT
AdaptHealth
AHCO
$1.47B
| $98K | ﹤0.01% |
3,600
+3,595
| +71,900% | +$103K |
|
6747
CALL
Capricor Therapeutics
CAPR
$223M
| $98K | ﹤0.01% |
19,200
+18,795
| +4,641% | +$79.6K |
|
|
CIVI
6748
CALL
DELISTED
Civitas Resources
CIVI
| $98K | ﹤0.01% |
2,100
+2,075
| +8,300% | +$84.2K |
|
|
DOYU
6749
PUT
DouYu International Holdings
DOYU
$139M
| $98K | ﹤0.01% |
+1,440
| New | +$124K |
|
6750
PUT
Harmonic Inc
HLIT
$1.25B
| $98K | ﹤0.01% |
11,600
+11,500
| +11,500% | +$88.1K |
|
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.