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 | |
|---|---|---|---|---|---|---|
5376
CALL
Ethan Allen Interiors
ETD
$574M
| $240K | ﹤0.01% |
8,700
+8,613
| +9,900% | +$249K |
|
5377
Gold Fields
GFI
$28.9B
| $240K | ﹤0.01% |
27,045
+8,740
| +48% | +$90.6K |
|
5378
CALL
PTC
PTC
$15.7B
| $240K | ﹤0.01% |
1,700
+1,259
| +285% | +$172K |
|
5379
Snap-on
SNA
$21.1B
| $240K | ﹤0.01% |
1,078
-6,725
| -86% | -$1.61M |
|
5380
CALL
E.W. Scripps
SSP
$259M
| $240K | ﹤0.01% |
+11,800
| New | +$247K |
|
|
DMK
5381
CALL
DELISTED
DMK Pharmaceuticals Corporation Common Stock
DMK
| $240K | ﹤0.01% |
3,129
+3,111
| +17,283% | +$189K |
|
|
ACB
5382
Aurora Cannabis
ACB
$174M
| $239K | ﹤0.01% |
2,644
+393
| +17% | +$34K |
|
5383
PUT
Brookfield
BN
$104B
| $239K | ﹤0.01% |
8,721
+8,514
| +4,113% | +$218K |
|
5384
Comtech Telecommunications
CMTL
$51.8M
| $239K | ﹤0.01% |
9,903
+7,204
| +267% | +$176K |
|
5385
CALL
Cyclerion Therapeutics
CYCN
$14.5M
| $239K | ﹤0.01% |
+3,065
| New | +$192K |
|
5386
PUT
Entergy
ETR
$50.6B
| $239K | ﹤0.01% |
4,800
+4,680
| +3,900% | +$247K |
|
5387
Direxion Daily Junior Gold Miners Index Bear 2X ETF
JDST
$31.6M
| $239K | ﹤0.01% |
115
+111
| +2,775% | +$208K |
|
|
RTB
5388
RTB Digital
RTB
$220M
| $239K | ﹤0.01% |
+57
| New | +$240K |
|
5389
PUT
Vivani Medical
VANI
$112M
| $239K | ﹤0.01% |
16,133
+16,118
| +107,453% | +$312K |
|
5390
PUT
Xylem
XYL
$27.1B
| $239K | ﹤0.01% |
2,000
+1,888
| +1,686% | +$216K |
|
|
BIOR
5391
CALL
DELISTED
Biora Therapeutics, Inc. Common Stock
BIOR
| $239K | ﹤0.01% |
268
+267
| +26,700% | +$204K |
|
5392
PUT
NexGen Energy
NXE
$6.11B
| $238K | ﹤0.01% |
58,200
+57,733
| +12,363% | +$246K |
|
|
TEN
5393
CALL
Tsakos Energy Navigation Ltd
TEN
$1.22B
| $238K | ﹤0.01% |
27,700
+27,625
| +36,833% | +$253K |
|
|
ATH
5394
DELISTED
Athene Holding Ltd. Class A Common Shares
ATH
| $238K | ﹤0.01% |
+3,534
| New | +$213K |
|
5395
Aldeyra Therapeutics
ALDX
$95.9M
| $237K | ﹤0.01% |
20,925
+7,359
| +54% | +$88.5K |
|
5396
CALL
Arcutis Biotherapeutics
ARQT
$3.42B
| $237K | ﹤0.01% |
8,700
+8,692
| +108,650% | +$245K |
|
|
ARR
5397
PUT
Armour Residential REIT
ARR
$2.33B
| $237K | ﹤0.01% |
4,160
+4,097
| +6,503% | +$246K |
|
|
SLAI
5398
CALL
DELISTED
SOLAI Ltd ADS
SLAI
| $237K | ﹤0.01% |
430
+429
| +42,900% | +$380K |
|
5399
CALL
Choice Hotels
CHH
$5.03B
| $237K | ﹤0.01% |
+2,000
| New | +$233K |
|
5400
CALL
Liberty Media Series A
FWONA
$22.8B
| $237K | ﹤0.01% |
5,431
+5,405
| +20,788% | +$209K |
|
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.