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 | |
|---|---|---|---|---|---|---|
3451
Advanced Energy
AEIS
$11.7B
| $802K | ﹤0.01% |
7,120
+6,262
| +730% | +$664K |
|
3452
PUT
Icahn Enterprises
IEP
$5.19B
| $802K | ﹤0.01% |
14,600
+14,435
| +8,748% | +$822K |
|
3453
CALL
La-Z-Boy
LZB
$1.62B
| $800K | ﹤0.01% |
21,600
+21,508
| +23,378% | +$904K |
|
3454
ProShares UltraPro Short 20+ Year Treasury
TTT
$18.4M
| $800K | ﹤0.01% |
21,801
-9,014
| -29% | -$373K |
|
|
GMS
3455
PUT
DELISTED
GMS Inc
GMS
| $799K | ﹤0.01% |
16,600
+16,455
| +11,348% | +$730K |
|
3456
CALL
Invesco Equal Weight 0-30 Year Treasury ETF
GOVI
$1.23B
| $799K | ﹤0.01% |
51,200
+50,921
| +18,251% | +$1.82M |
|
3457
SSR Mining
SSRM
$5.45B
| $799K | ﹤0.01% |
51,252
+42,818
| +508% | +$720K |
|
3458
PUT
Qiagen
QGEN
$8.47B
| $798K | ﹤0.01% |
15,560
+15,495
| +23,838% | +$800K |
|
3459
Stride
LRN
$3.83B
| $797K | ﹤0.01% |
24,819
-1,115
| -4% | -$33.2K |
|
|
ARNA
3460
CALL
DELISTED
Arena Pharmaceuticals Inc
ARNA
| $797K | ﹤0.01% |
11,700
+11,616
| +13,829% | +$757K |
|
|
ECHO
3461
CALL
EchoStar
ECHO
$25.1B
| $796K | ﹤0.01% |
32,800
+32,546
| +12,813% | +$835K |
|
3462
Sprouts Farmers Market
SFM
$7.23B
| $796K | ﹤0.01% |
32,070
-54,393
| -63% | -$1.45M |
|
3463
CALL
Energy Fuels
UUUU
$2.93B
| $796K | ﹤0.01% |
131,600
+131,133
| +28,080% | +$805K |
|
3464
PUT
Adient
ADNT
$1.62B
| $795K | ﹤0.01% |
+17,600
| New | +$823K |
|
3465
PUT
Flex
FLEX
$42.5B
| $795K | ﹤0.01% |
59,052
+57,568
| +3,879% | +$782K |
|
|
UBX
3466
CALL
DELISTED
Unity Biotechnology
UBX
| $795K | ﹤0.01% |
17,140
+17,104
| +47,511% | +$824K |
|
3467
Arista Networks
ANET
$215B
| $794K | ﹤0.01% |
35,088
-32,768
| -48% | -$684K |
|
3468
CALL
Flowserve
FLS
$9.29B
| $794K | ﹤0.01% |
19,700
+19,630
| +28,043% | +$811K |
|
3469
PUT
Rush Street Interactive
RSI
$3.26B
| $794K | ﹤0.01% |
64,800
+64,422
| +17,043% | +$865K |
|
3470
PUT
Waters Corp
WAT
$36.4B
| $794K | ﹤0.01% |
2,300
+2,262
| +5,953% | +$716K |
|
3471
Nano X Imaging
NNOX
$61.7M
| $793K | ﹤0.01% |
24,748
-24,835
| -50% | -$755K |
|
3472
United States 12 Month Oil Fund,
USL
$44.8M
| $793K | ﹤0.01% |
31,008
-17,760
| -36% | -$414K |
|
3473
PUT
PBF Energy
PBF
$7.43B
| $792K | ﹤0.01% |
+51,800
| New | +$800K |
|
|
PDS
3474
CALL
Precision Drilling
PDS
$1.04B
| $792K | ﹤0.01% |
19,000
+18,944
| +33,829% | +$589K |
|
3475
PUT
XP
XP
$8.65B
| $792K | ﹤0.01% |
18,200
+18,046
| +11,718% | +$746K |
|
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.