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 | |
|---|---|---|---|---|---|---|
|
OIG
6401
DELISTED
Orbital Infrastructure Group, Inc. Common Stock
OIG
| $126K | ﹤0.01% |
+721
| New | +$126K |
|
|
ATRS
6402
PUT
DELISTED
Antares Pharma, Inc.
ATRS
| $126K | ﹤0.01% |
28,900
+28,392
| +5,589% | +$116K |
|
6403
PUT
Akebia Therapeutics
AKBA
$354M
| $125K | ﹤0.01% |
33,100
+32,224
| +3,679% | +$108K |
|
|
NBP
6404
PUT
NovaBridge Biosciences American Depositary Shares
NBP
$185M
| $125K | ﹤0.01% |
1,500
+1,497
| +49,900% | +$98.8K |
|
6405
Kratos Defense & Security Solutions
KTOS
$8.74B
| $125K | ﹤0.01% |
4,407
-42,992
| -91% | -$1.14M |
|
6406
PUT
NBT Bancorp
NBTB
$2.74B
| $125K | ﹤0.01% |
3,500
+3,494
| +58,233% | +$135K |
|
6407
Palomar
PLMR
$3.55B
| $125K | ﹤0.01% |
1,664
+610
| +58% | +$44K |
|
6408
Yeti Holdings
YETI
$3.71B
| $125K | ﹤0.01% |
+1,365
| New | +$119K |
|
6409
CALL
BioXcel Therapeutics
BTAI
$24.9M
| $124K | ﹤0.01% |
269
+267
| +13,350% | +$146K |
|
6410
CACI
CACI
$11B
| $124K | ﹤0.01% |
489
-1,177
| -71% | -$304K |
|
6411
Commault Systems
CVLT
$4.88B
| $124K | ﹤0.01% |
1,590
+383
| +32% | +$27.8K |
|
6412
CALL
Finance of America Companies
FOA
$203M
| $124K | ﹤0.01% |
+1,630
| New | +$158K |
|
6413
CALL
Haverty Furniture Companies
HVT
$397M
| $124K | ﹤0.01% |
2,900
+2,897
| +96,567% | +$127K |
|
6414
CALL
LSI Industries
LYTS
$859M
| $124K | ﹤0.01% |
15,500
+15,490
| +154,900% | +$130K |
|
6415
NiSource
NI
$21.3B
| $124K | ﹤0.01% |
5,065
+3,735
| +281% | +$95K |
|
|
PDS
6416
Precision Drilling
PDS
$999M
| $124K | ﹤0.01% |
+2,980
| New | +$92.6K |
|
|
HTT
6417
High Templar Tech Ltd
HTT
$379M
| $124K | ﹤0.01% |
51,799
-23,773
| -31% | -$50.9K |
|
6418
Relmada Therapeutics
RLMD
$557M
| $124K | ﹤0.01% |
3,886
-4,357
| -53% | -$151K |
|
6419
PUT
Siebert Financial
SIEB
$66.7M
| $124K | ﹤0.01% |
25,900
+25,611
| +8,862% | +$106K |
|
6420
CALL
iShares 0-5 Year Investment Grade Corporate Bond ETF
SLQD
$2.37B
| $124K | ﹤0.01% |
2,500
+2,457
| +5,714% | +$127K |
|
6421
CALL
Vanda Pharmaceuticals
VNDA
$307M
| $124K | ﹤0.01% |
5,800
+5,740
| +9,567% | +$103K |
|
|
HYRE
6422
DELISTED
HyreCar Inc. Common Stock
HYRE
| $124K | ﹤0.01% |
5,974
-2,349
| -28% | -$36.1K |
|
|
NAVB
6423
PUT
DELISTED
Navidea Biopharmaceuticals Inc.
NAVB
| $124K | ﹤0.01% |
68,000
+67,879
| +56,098% | +$120K |
|
6424
CALL
Arvinas
ARVN
$518M
| $123K | ﹤0.01% |
1,600
+1,565
| +4,471% | +$109K |
|
|
BPT
6425
CALL
DELISTED
BP Prudhoe Bay Royalty Trust
BPT
| $123K | ﹤0.01% |
+24,200
| New | +$96.7K |
|
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.