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 | |
|---|---|---|---|---|---|---|
|
GOCO
4826
PUT
DELISTED
GoHealth
GOCO
| $328K | ﹤0.01% |
1,953
+1,916
| +5,178% | +$336K |
|
4827
Oceaneering
OII
$4.64B
| $328K | ﹤0.01% |
+21,102
| New | +$294K |
|
4828
PUT
Emergent Biosolutions
EBS
$379M
| $327K | ﹤0.01% |
5,200
+5,129
| +7,224% | +$330K |
|
4829
Idexx Laboratories
IDXX
$44.9B
| $327K | ﹤0.01% |
518
-1,351
| -72% | -$746K |
|
4830
PUT
Myriad Genetics
MYGN
$476M
| $327K | ﹤0.01% |
10,700
+10,698
| +534,900% | +$309K |
|
|
PINC
4831
CALL
DELISTED
Premier
PINC
| $327K | ﹤0.01% |
9,400
+9,397
| +313,233% | +$324K |
|
|
VXRT
4832
DELISTED
Vaxart
VXRT
| $327K | ﹤0.01% |
43,666
+2,699
| +7% | +$18.8K |
|
4833
Becton Dickinson
BDX
$46.4B
| $326K | ﹤0.01% |
1,376
-2,468
| -64% | -$592K |
|
4834
PUT
VanEck Energy Income ETF
EINC
$77.6M
| $326K | ﹤0.01% |
5,000
+4,947
| +9,334% | +$264K |
|
4835
CALL
Advanced Drainage Systems
WMS
$10.6B
| $326K | ﹤0.01% |
2,800
+2,702
| +2,757% | +$300K |
|
|
CMBT
4836
CALL
CMB.TECH NV
CMBT
$4.52B
| $326K | ﹤0.01% |
35,000
+34,989
| +318,082% | +$319K |
|
|
ABB
4837
PUT
DELISTED
ABB Ltd
ABB
| $326K | ﹤0.01% |
9,600
+9,476
| +7,642% | +$317K |
|
4838
Jones Lang LaSalle
JLL
$15.8B
| $325K | ﹤0.01% |
1,666
-1,081
| -39% | -$211K |
|
|
LADR
4839
PUT
Ladder Capital
LADR
$1.24B
| $325K | ﹤0.01% |
28,200
+27,520
| +4,047% | +$323K |
|
4840
PUT
Loop Industries
LOOP
$34.8M
| $325K | ﹤0.01% |
26,400
+26,368
| +82,400% | +$257K |
|
4841
PUT
Post Holdings
POST
$4.42B
| $325K | ﹤0.01% |
4,584
+4,567
| +26,865% | +$337K |
|
|
ALLK
4842
CALL
DELISTED
Allakos
ALLK
| $324K | ﹤0.01% |
3,800
+3,778
| +17,173% | +$377K |
|
4843
CALL
Ares Management
ARES
$28.1B
| $324K | ﹤0.01% |
5,100
+5,041
| +8,544% | +$282K |
|
4844
Bread Financial
BFH
$4.32B
| $324K | ﹤0.01% |
3,908
-8,127
| -68% | -$735K |
|
4845
CALL
Masco
MAS
$14.3B
| $324K | ﹤0.01% |
5,500
+5,231
| +1,945% | +$322K |
|
4846
CALL
Radian Group
RDN
$5.28B
| $324K | ﹤0.01% |
14,600
+13,479
| +1,202% | +$315K |
|
4847
Transocean
RIG
$5.48B
| $324K | ﹤0.01% |
71,735
-95,484
| -57% | -$362K |
|
4848
CALL
Westlake Corp
WLK
$9.26B
| $324K | ﹤0.01% |
3,600
+3,572
| +12,757% | +$347K |
|
|
FMDG
4849
CALL
DELISTED
Fieldstone Merlin Dynamic Large Cap Growth ETF
FMDG
| $324K | ﹤0.01% |
18,900
+18,457
| +4,166% | +$316K |
|
4850
CALL
A10 Networks
ATEN
$2.07B
| $323K | ﹤0.01% |
28,700
+28,467
| +12,218% | +$276K |
|
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.