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 | |
|---|---|---|---|---|---|---|
|
HMHC
3176
CALL
DELISTED
Houghton Mifflin Harcourt Company
HMHC
| $963K | ﹤0.01% |
+87,300
| New | +$822K |
|
3177
PUT
Ionis Pharmaceuticals
IONS
$9.25B
| $961K | ﹤0.01% |
24,100
+23,915
| +12,927% | +$937K |
|
|
OTRK
3178
CALL
DELISTED
Ontrak
OTRK
| $961K | ﹤0.01% |
329
+327
| +16,350% | +$945K |
|
3179
PUT
Urban Outfitters
URBN
$6.22B
| $960K | ﹤0.01% |
23,300
+22,115
| +1,866% | +$834K |
|
|
KLR
3180
CALL
DELISTED
Kaleyra, Inc.
KLR
| $959K | ﹤0.01% |
22,400
+22,246
| +14,445% | +$1M |
|
|
TTCF
3181
PUT
DELISTED
Tattooed Chef, Inc Class A Common Stock
TTCF
| $958K | ﹤0.01% |
44,700
+43,796
| +4,845% | +$859K |
|
3182
PUT
Copa Holdings
CPA
$5.65B
| $956K | ﹤0.01% |
12,700
+12,588
| +11,239% | +$1.01M |
|
3183
Axalta
AXTA
$7.22B
| $953K | ﹤0.01% |
31,275
-30,762
| -50% | -$974K |
|
3184
PUT
Designer Brands
DBI
$298M
| $953K | ﹤0.01% |
57,600
+57,102
| +11,466% | +$1.01M |
|
3185
CALL
Graco
GGG
$13B
| $953K | ﹤0.01% |
12,600
+12,559
| +30,632% | +$943K |
|
3186
ProShares UltraPro S&P 500
UPRO
$5.09B
| $953K | ﹤0.01% |
16,822
-76,026
| -82% | -$3.99M |
|
|
CCXI
3187
CALL
DELISTED
ChemoCentryx, Inc.
CCXI
| $953K | ﹤0.01% |
71,200
+71,119
| +87,801% | +$1.75M |
|
3188
Calix
CALX
$2.32B
| $952K | ﹤0.01% |
+20,046
| New | +$880K |
|
3189
Masco
MAS
$16.4B
| $952K | ﹤0.01% |
+16,161
| New | +$996K |
|
3190
CALL
Tiptree Inc
TIPT
$678M
| $952K | ﹤0.01% |
+102,400
| New | +$1.08M |
|
3191
American Well
AMWL
$185M
| $951K | ﹤0.01% |
3,781
+1,177
| +45% | +$339K |
|
3192
Anterix
ATEX
$1.83B
| $950K | ﹤0.01% |
15,847
-1,441
| -8% | -$72.2K |
|
3193
PUT
Cedar Fair
FUN
$1.8B
| $950K | ﹤0.01% |
21,200
+21,055
| +14,521% | +$997K |
|
3194
PUT
Blue Owl Capital
OWL
$6.54B
| $950K | ﹤0.01% |
73,800
+73,397
| +18,213% | +$832K |
|
|
OTRK
3195
PUT
DELISTED
Ontrak
OTRK
| $948K | ﹤0.01% |
324
+322
| +16,100% | +$930K |
|
3196
PUT
Rayonier
RYN
$6.52B
| $948K | ﹤0.01% |
29,099
+29,069
| +96,897% | +$954K |
|
|
SWAV
3197
PUT
DELISTED
Shockwave Medical, Inc. Common Stock
SWAV
| $948K | ﹤0.01% |
5,000
+4,961
| +12,721% | +$812K |
|
3198
PUT
HF Sinclair
DINO
$16.4B
| $947K | ﹤0.01% |
28,800
+28,439
| +7,878% | +$989K |
|
3199
Perion Network
PERI
$371M
| $947K | ﹤0.01% |
44,250
-39,711
| -47% | -$671K |
|
3200
Inseego
INSG
$114M
| $946K | ﹤0.01% |
9,381
-1,917
| -17% | -$175K |
|
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.