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 | |
|---|---|---|---|---|---|---|
6876
Mustang Bio
MBIO
$4.5M
| $90K | ﹤0.01% |
36
+10
| +38% | +$24.5K |
|
6877
ALPS O'Shares Global Internet Giants ETF
OGIG
$103M
| $90K | ﹤0.01% |
1,594
-4,301
| -73% | -$231K |
|
6878
CALL
Titan International
TWI
$475M
| $90K | ﹤0.01% |
10,700
+10,288
| +2,497% | +$100K |
|
|
NAGE
6879
Niagen Bioscience
NAGE
$264M
| $90K | ﹤0.01% |
9,214
-13,269
| -59% | -$116K |
|
|
BCOV
6880
PUT
DELISTED
Brightcove, Inc.
BCOV
| $90K | ﹤0.01% |
6,300
+6,227
| +8,530% | +$100K |
|
|
EXTN
6881
PUT
DELISTED
Exterran Corporation
EXTN
| $90K | ﹤0.01% |
19,000
+18,809
| +9,848% | +$80.5K |
|
|
FST
6882
CALL
DELISTED
FAST Acquisition Corp.
FST
| $90K | ﹤0.01% |
7,700
+7,659
| +18,680% | +$94.7K |
|
|
RBAC
6883
PUT
DELISTED
RedBall Acquisition Corp.
RBAC
| $90K | ﹤0.01% |
9,300
+7,918
| +573% | +$78.4K |
|
|
EPZM
6884
DELISTED
Epizyme, Inc
EPZM
| $90K | ﹤0.01% |
10,917
+10,233
| +1,496% | +$86.3K |
|
|
AFMD
6885
PUT
DELISTED
Affimed
AFMD
| $89K | ﹤0.01% |
1,050
+1,046
| +26,150% | +$95.4K |
|
|
ALEX
6886
CALL
DELISTED
Alexander & Baldwin
ALEX
| $89K | ﹤0.01% |
4,900
+4,869
| +15,706% | +$89.7K |
|
6887
A.O. Smith
AOS
$8.24B
| $89K | ﹤0.01% |
1,245
-3,719
| -75% | -$257K |
|
6888
First Trust Dow Jones Internet Index Fund ETF
FDN
$5B
| $89K | ﹤0.01% |
+365
| New | +$83.4K |
|
6889
CALL
MicroSectors FANG+ ETNs due Jan 8 2038
FNGS
$548M
| $89K | ﹤0.01% |
2,800
+2,784
| +17,400% | +$82.2K |
|
6890
Hanmi Financial
HAFC
$940M
| $89K | ﹤0.01% |
4,698
-6,737
| -59% | -$138K |
|
6891
PUT
HCI Group
HCI
$2.32B
| $89K | ﹤0.01% |
900
+869
| +2,803% | +$70.5K |
|
6892
CALL
Henry Schein
HSIC
$9.7B
| $89K | ﹤0.01% |
1,200
+1,068
| +809% | +$80.5K |
|
6893
PUT
Coca-Cola Femsa
KOF
$22.9B
| $89K | ﹤0.01% |
1,700
+1,699
| +169,900% | +$83.6K |
|
6894
monday.com
MNDY
$3.73B
| $89K | ﹤0.01% |
+400
| New | +$87.1K |
|
6895
CALL
Regis Corp
RGS
$68.5M
| $89K | ﹤0.01% |
480
+476
| +11,900% | +$102K |
|
6896
PUT
Smart Sand
SND
$179M
| $89K | ﹤0.01% |
26,800
+26,515
| +9,304% | +$69.4K |
|
6897
CALL
Textron
TXT
$15B
| $89K | ﹤0.01% |
1,300
+1,238
| +1,997% | +$80K |
|
|
TPC
6898
Tutor Perini Cor
TPC
$4.38B
| $89K | ﹤0.01% |
+6,488
| New | +$103K |
|
|
GATO
6899
PUT
DELISTED
Gatos Silver, Inc.
GATO
| $89K | ﹤0.01% |
+5,100
| New | +$71.9K |
|
|
ACOR
6900
PUT
DELISTED
Acorda Therapeutics
ACOR
| $89K | ﹤0.01% |
1,025
+1,015
| +10,150% | +$88.8K |
|
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.