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 | |
|---|---|---|---|---|---|---|
3126
PUT
Deckers Outdoor
DECK
$13.7B
| $998K | ﹤0.01% |
15,600
+15,174
| +3,562% | +$856K |
|
3127
TransDigm Group
TDG
$72.1B
| $998K | ﹤0.01% |
1,543
-4,167
| -73% | -$2.61M |
|
3128
CALL
Acadia Healthcare
ACHC
$2.97B
| $997K | ﹤0.01% |
15,900
+15,645
| +6,135% | +$981K |
|
3129
MetLife
MET
$61.3B
| $996K | ﹤0.01% |
+16,644
| New | +$1.05M |
|
|
RFP
3130
DELISTED
Resolute Forest Products Inc.
RFP
| $996K | ﹤0.01% |
81,706
+8,047
| +11% | +$113K |
|
|
CNR
3131
DELISTED
Cornerstone Building Brands, Inc.
CNR
| $995K | ﹤0.01% |
54,765
+2,724
| +5% | +$43.9K |
|
3132
Tootsie Roll Industries
TR
$2.89B
| $991K | ﹤0.01% |
33,898
+17,381
| +105% | +$490K |
|
|
IPG
3133
CALL
DELISTED
Interpublic Group of Companies
IPG
| $990K | ﹤0.01% |
30,500
+29,963
| +5,580% | +$958K |
|
3134
Banco Santander
SAN
$200B
| $989K | ﹤0.01% |
253,130
-9,516
| -4% | -$36.9K |
|
3135
PUT
BGC Group
BGC
$5.61B
| $986K | ﹤0.01% |
173,900
+173,568
| +52,280% | +$992K |
|
3136
CALL
Perella Weinberg Partners
PWP
$1.17B
| $986K | ﹤0.01% |
+76,700
| New | +$904K |
|
|
3137
CALL
Banco Santander
SAN
$200B
| $984K | ﹤0.01% |
251,800
+249,201
| +9,588% | +$967K |
|
|
CLVS
3138
CALL
DELISTED
Clovis Oncology, Inc.
CLVS
| $984K | ﹤0.01% |
169,800
+167,910
| +8,884% | +$984K |
|
3139
CALL
Clarivate
CLVT
$1.36B
| $982K | ﹤0.01% |
35,700
+35,566
| +26,542% | +$978K |
|
3140
Cracker Barrel
CBRL
$1.17B
| $981K | ﹤0.01% |
+6,611
| New | +$1.06M |
|
3141
Equinox Gold
EQX
$7.51B
| $981K | ﹤0.01% |
141,291
+3,636
| +3% | +$31.1K |
|
|
LHCG
3142
CALL
DELISTED
LHC Group LLC
LHCG
| $981K | ﹤0.01% |
+4,900
| New | +$983K |
|
|
OPLN
3143
Openlane
OPLN
$4.25B
| $980K | ﹤0.01% |
55,866
-25,687
| -31% | -$435K |
|
|
SPTN
3144
CALL
DELISTED
SpartanNash
SPTN
| $979K | ﹤0.01% |
50,700
+50,487
| +23,703% | +$1.01M |
|
|
DVAX
3145
DELISTED
Dynavax Technologies
DVAX
| $978K | ﹤0.01% |
99,357
+5,839
| +6% | +$53.1K |
|
3146
PUT
Arvinas
ARVN
$536M
| $977K | ﹤0.01% |
12,700
+12,566
| +9,378% | +$872K |
|
3147
PUT
Frontline
FRO
$8.62B
| $977K | ﹤0.01% |
108,600
+107,781
| +13,160% | +$867K |
|
3148
Roundhill Video Games ETF
NERD
$14.5M
| $977K | ﹤0.01% |
31,002
-18,173
| -37% | -$578K |
|
3149
Kimbell Royalty Partners
KRP
$1.45B
| $976K | ﹤0.01% |
76,002
-612
| -0.8% | -$7.29K |
|
3150
CALL
Vanguard Short-Term Treasury ETF
VGSH
$29.3B
| $976K | ﹤0.01% |
12,600
+12,511
| +14,057% | +$770K |
|
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.