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 | |
|---|---|---|---|---|---|---|
6276
PUT
Bentley Systems
BSY
$10.8B
| $136K | ﹤0.01% |
2,100
+2,098
| +104,900% | +$115K |
|
6277
CleanSpark
CLSK
$3.53B
| $136K | ﹤0.01% |
8,226
-76,945
| -90% | -$1.41M |
|
|
OLP
6278
PUT
One Liberty Properties
OLP
$530M
| $136K | ﹤0.01% |
4,800
+4,704
| +4,900% | +$122K |
|
6279
PUT
Prospect Capital
PSEC
$1.07B
| $136K | ﹤0.01% |
+16,300
| New | +$136K |
|
6280
CALL
RB Global
RBA
$20.4B
| $136K | ﹤0.01% |
2,300
+2,280
| +11,400% | +$140K |
|
6281
PUT
Reinsurance Group of America
RGA
$15.5B
| $136K | ﹤0.01% |
1,200
+1,171
| +4,038% | +$147K |
|
|
OLOX
6282
PUT
Olenox Industries
OLOX
$6.74M
| $136K | ﹤0.01% |
+4
| New | +$94.9K |
|
|
CGRN
6283
PUT
DELISTED
Capstone Green Energy Corporation Common Stock
CGRN
| $136K | ﹤0.01% |
24,300
+24,213
| +27,831% | +$183K |
|
|
AUD
6284
DELISTED
Audacy, Inc.
AUD
| $136K | ﹤0.01% |
31,596
+14,341
| +83% | +$65.9K |
|
|
QUMU
6285
DELISTED
Qumu Corp.
QUMU
| $136K | ﹤0.01% |
47,339
+46,852
| +9,621% | +$230K |
|
|
AXU
6286
DELISTED
Alexco Resource Corp
AXU
| $136K | ﹤0.01% |
54,541
-10,133
| -16% | -$28.5K |
|
|
ARNA
6287
PUT
DELISTED
Arena Pharmaceuticals Inc
ARNA
| $136K | ﹤0.01% |
2,000
+1,849
| +1,225% | +$121K |
|
|
STL
6288
PUT
DELISTED
Sterling Bancorp
STL
| $136K | ﹤0.01% |
5,500
+5,441
| +9,222% | +$137K |
|
6289
PUT
ADT
ADT
$5.58B
| $135K | ﹤0.01% |
12,600
+12,057
| +2,220% | +$121K |
|
|
BHR
6290
CALL
Braemar Hotels & Resorts
BHR
$156M
| $135K | ﹤0.01% |
21,900
+21,514
| +5,574% | +$133K |
|
6291
CALL
Brookdale Senior Living
BKD
$3.49B
| $135K | ﹤0.01% |
17,100
+16,966
| +12,661% | +$122K |
|
6292
VanEck Social Sentiment ETF
BUZZ
$90.5M
| $135K | ﹤0.01% |
5,058
-6,546
| -56% | -$162K |
|
6293
CALL
Diodes
DIOD
$3.78B
| $135K | ﹤0.01% |
1,700
+1,681
| +8,847% | +$129K |
|
6294
Markel Group
MKL
$23.3B
| $135K | ﹤0.01% |
114
+13
| +13% | +$15.6K |
|
6295
Onto Innovation
ONTO
$12.9B
| $135K | ﹤0.01% |
1,856
+461
| +33% | +$31.7K |
|
6296
CALL
Option Care Health
OPCH
$3.45B
| $135K | ﹤0.01% |
6,200
+5,872
| +1,790% | +$113K |
|
6297
iShares Residential and Multisector Real Estate ETF
REZ
$879M
| $135K | ﹤0.01% |
+1,624
| New | +$130K |
|
6298
CALL
Hanover Insurance
THG
$8.1B
| $135K | ﹤0.01% |
+1,000
| New | +$137K |
|
|
ABTC
6299
American Bitcoin Corp
ABTC
$403M
| $135K | ﹤0.01% |
+1
| New | +$125K |
|
|
EMKR
6300
PUT
DELISTED
Emcore Corp
EMKR
| $135K | ﹤0.01% |
1,470
+1,457
| +11,208% | +$118K |
|
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.