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 | |
|---|---|---|---|---|---|---|
|
USX
7951
CALL
DELISTED
U.S. Xpress Enterprises, Inc. Class A Common Stock
USX
| $39K | ﹤0.01% |
4,600
+4,411
| +2,334% | +$46.9K |
|
|
PHAS
7952
PUT
DELISTED
PhaseBio Pharmaceuticals, Inc. Common Stock
PHAS
| $39K | ﹤0.01% |
10,500
+10,486
| +74,900% | +$34.9K |
|
|
QTNT
7953
CALL
DELISTED
Quotient Limited Ordinary Shares
QTNT
| $39K | ﹤0.01% |
270
+266
| +6,650% | +$42.5K |
|
|
LMRK
7954
CALL
DELISTED
Landmark Infrastructure Partners LP Common Units
LMRK
| $39K | ﹤0.01% |
3,100
+3,088
| +25,733% | +$38.9K |
|
|
CYB
7955
DELISTED
WisdomTree Chinese Yuan Strategy Fund
CYB
| $39K | ﹤0.01% |
1,432
-1,970
| -58% | -$54.5K |
|
|
ASRT
7956
PUT
DELISTED
Assertio
ASRT
| $38K | ﹤0.01% |
1,640
+1,630
| +16,300% | +$47K |
|
7957
CALL
Compañía de Minas Buenaventura
BVN
$7.72B
| $38K | ﹤0.01% |
4,200
+4,128
| +5,733% | +$43.3K |
|
7958
PUT
CorMedix
CRMD
$577M
| $38K | ﹤0.01% |
5,600
+5,403
| +2,743% | +$43K |
|
7959
Evolution Petroleum
EPM
$131M
| $38K | ﹤0.01% |
7,726
+1,858
| +32% | +$7.3K |
|
7960
PUT
FNB Corp
FNB
$6.81B
| $38K | ﹤0.01% |
3,100
+2,916
| +1,585% | +$37.9K |
|
7961
PUT
Goldgroup Mining Inc.
GORO
$152M
| $38K | ﹤0.01% |
14,800
+14,139
| +2,139% | +$39.1K |
|
7962
PUT
IMAX
IMAX
$2.59B
| $38K | ﹤0.01% |
1,800
+1,722
| +2,208% | +$37.1K |
|
7963
Direxion Daily S&P Biotech Bear 3X ETF
LABD
$67.8M
| $38K | ﹤0.01% |
202
-941
| -82% | -$211K |
|
7964
PUT
Mercury Insurance
MCY
$6.07B
| $38K | ﹤0.01% |
600
+573
| +2,122% | +$36.3K |
|
7965
Medallion Financial
MFIN
$229M
| $38K | ﹤0.01% |
+4,385
| New | +$37.8K |
|
7966
CALL
Mueller Industries
MLI
$14.7B
| $38K | ﹤0.01% |
+3,600
| New | +$40.7K |
|
|
MRSN
7967
PUT
DELISTED
Mersana Therapeutics
MRSN
| $38K | ﹤0.01% |
112
+109
| +3,633% | +$41.3K |
|
7968
PUT
Blue Owl Capital
OBDC
$5.47B
| $38K | ﹤0.01% |
2,700
+2,689
| +24,445% | +$38.6K |
|
|
OGI
7969
Organigram Holdings
OGI
$134M
| $38K | ﹤0.01% |
3,409
+2,264
| +198% | +$25.8K |
|
|
OPRA
7970
PUT
Opera Ltd
OPRA
$1.71B
| $38K | ﹤0.01% |
3,800
+3,689
| +3,323% | +$39.1K |
|
7971
PUT
Patterson-UTI
PTEN
$3.48B
| $38K | ﹤0.01% |
3,900
+3,824
| +5,032% | +$32.3K |
|
7972
RPAR Risk Parity ETF
RPAR
$574M
| $38K | ﹤0.01% |
1,563
+1,144
| +273% | +$27.2K |
|
7973
Ryanair
RYAAY
$31B
| $38K | ﹤0.01% |
898
-275
| -23% | -$12.4K |
|
7974
PUT
Travelzoo
TZOO
$77.8M
| $38K | ﹤0.01% |
2,600
+2,507
| +2,696% | +$40.3K |
|
7975
PUT
Vertiv
VRT
$104B
| $38K | ﹤0.01% |
1,400
+1,341
| +2,273% | +$32.1K |
|
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.