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 | |
|---|---|---|---|---|---|---|
5901
CALL
AvePoint
AVPT
$2.76B
| $174K | ﹤0.01% |
261,400
+259,596
| +14,390% | +$2.83M |
|
5902
PUT
Barings BDC
BBDC
$864M
| $174K | ﹤0.01% |
16,500
+16,358
| +11,520% | +$171K |
|
5903
Boise Cascade
BCC
$2.69B
| $174K | ﹤0.01% |
2,984
-6,211
| -68% | -$403K |
|
5904
PUT
Caleres
CAL
$431M
| $174K | ﹤0.01% |
6,400
+6,295
| +5,995% | +$158K |
|
|
EXK
5905
Endeavour Silver
EXK
$2.23B
| $174K | ﹤0.01% |
28,476
-44,012
| -61% | -$275K |
|
5906
Golar LNG
GLNG
$5B
| $174K | ﹤0.01% |
13,183
+10,573
| +405% | +$126K |
|
5907
PUT
La-Z-Boy
LZB
$1.58B
| $174K | ﹤0.01% |
4,700
+4,691
| +52,122% | +$197K |
|
5908
Murphy USA
MUSA
$11.2B
| $174K | ﹤0.01% |
1,305
+33
| +3% | +$4.56K |
|
5909
CALL
Vir Biotechnology
VIR
$1.46B
| $174K | ﹤0.01% |
3,696
+3,362
| +1,007% | +$153K |
|
5910
PUT
Metallus
MTUS
$838M
| $174K | ﹤0.01% |
+12,300
| New | +$166K |
|
|
ONC
5911
BeOne Medicines Ltd
ONC
$32.8B
| $174K | ﹤0.01% |
508
+178
| +54% | +$59K |
|
|
LUNA
5912
PUT
DELISTED
Luna Innovations Incorporated
LUNA
| $174K | ﹤0.01% |
16,100
+15,999
| +15,841% | +$174K |
|
|
ADVM
5913
CALL
DELISTED
Adverum Biotechnologies
ADVM
| $173K | ﹤0.01% |
4,970
+4,964
| +82,733% | +$267K |
|
5914
Genworth Financial
GNW
$3.76B
| $173K | ﹤0.01% |
44,608
+38,466
| +626% | +$154K |
|
5915
Harmonic Inc
HLIT
$1.25B
| $173K | ﹤0.01% |
20,307
+4,050
| +25% | +$31K |
|
5916
CALL
Manitowoc
MTW
$497M
| $173K | ﹤0.01% |
+7,100
| New | +$169K |
|
5917
PUT
TriNet
TNET
$3.02B
| $173K | ﹤0.01% |
2,400
+2,353
| +5,006% | +$182K |
|
5918
ProShares UltraShort Russell2000
TWM
$44.3M
| $173K | ﹤0.01% |
2,617
+2,403
| +1,123% | +$169K |
|
5919
PUT
Twist Bioscience
TWST
$5.7B
| $173K | ﹤0.01% |
1,300
+1,240
| +2,067% | +$144K |
|
5920
CALL
Aquestive Therapeutics
AQST
$463M
| $172K | ﹤0.01% |
43,400
+42,787
| +6,980% | +$171K |
|
5921
VanEck Brazil Small-Cap ETF
BRF
$21.9M
| $172K | ﹤0.01% |
6,993
+6,894
| +6,964% | +$156K |
|
5922
BWX Technologies
BWXT
$15.5B
| $172K | ﹤0.01% |
+2,969
| New | +$191K |
|
5923
EnerSys
ENS
$6.78B
| $172K | ﹤0.01% |
+1,763
| New | +$164K |
|
|
FPI
5924
PUT
Farmland Partners
FPI
$408M
| $172K | ﹤0.01% |
14,300
+14,223
| +18,471% | +$183K |
|
5925
CALL
Ichor Holdings
ICHR
$2.62B
| $172K | ﹤0.01% |
3,200
+3,101
| +3,132% | +$171K |
|
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.