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 | |
|---|---|---|---|---|---|---|
|
SAGE
1401
PUT
DELISTED
Sage Therapeutics
SAGE
| $3.98M | ﹤0.01% |
70,100
+69,149
| +7,271% | +$4.89M |
|
1402
PUT
Cheniere Energy
LNG
$56.5B
| $3.96M | ﹤0.01% |
45,600
+45,437
| +27,875% | +$3.7M |
|
1403
PUT
Elastic
ESTC
$6.1B
| $3.95M | ﹤0.01% |
27,100
+27,059
| +65,998% | +$3.38M |
|
|
HIMX
1404
CALL
Himax Technologies
HIMX
$2.2B
| $3.95M | ﹤0.01% |
+236,900
| New | +$3.13M |
|
1405
CALL
Mirion Technologies
MIR
$4.05B
| $3.94M | ﹤0.01% |
379,300
+375,900
| +11,056% | +$3.87M |
|
1406
PUT
McKesson
MCK
$98.5B
| $3.92M | ﹤0.01% |
+20,500
| New | +$3.96M |
|
1407
Direxion Daily Energy Bull 2X ETF
ERX
$249M
| $3.92M | ﹤0.01% |
138,724
-42,721
| -24% | -$1.13M |
|
1408
PUT
Host Hotels & Resorts
HST
$16.8B
| $3.91M | ﹤0.01% |
228,800
+228,032
| +29,692% | +$3.97M |
|
1409
CALL
Albemarle
ALB
$13.5B
| $3.91M | ﹤0.01% |
23,200
+23,053
| +15,682% | +$3.72M |
|
1410
PUT
Reliance Steel & Aluminium
RS
$20.8B
| $3.91M | ﹤0.01% |
25,900
+25,881
| +136,216% | +$4.2M |
|
|
RIDE
1411
PUT
DELISTED
Lordstown Motors Corp. Class A Common Stock
RIDE
| $3.91M | ﹤0.01% |
23,560
+23,381
| +13,062% | +$3.59M |
|
|
CALY
1412
PUT
Callaway Golf Company
CALY
$3.26B
| $3.9M | ﹤0.01% |
115,800
+114,606
| +9,598% | +$3.68M |
|
1413
CALL
Arrowhead Research
ARWR
$12.1B
| $3.9M | ﹤0.01% |
+47,100
| New | +$3.51M |
|
|
PFPT
1414
CALL
DELISTED
Proofpoint, Inc.
PFPT
| $3.89M | ﹤0.01% |
22,400
+22,167
| +9,514% | +$3.6M |
|
1415
CALL
Unilever
UL
$131B
| $3.89M | ﹤0.01% |
59,111
+58,690
| +13,941% | +$3.9M |
|
|
RIDE
1416
CALL
DELISTED
Lordstown Motors Corp. Class A Common Stock
RIDE
| $3.88M | ﹤0.01% |
23,373
+23,193
| +12,885% | +$3.56M |
|
1417
CALL
nLIGHT
LASR
$3.95B
| $3.87M | ﹤0.01% |
106,800
+106,781
| +562,005% | +$3.19M |
|
1418
PUT
Vanguard Consumer Discretionary ETF
VCR
$5.84B
| $3.87M | ﹤0.01% |
20,100
+19,938
| +12,307% | +$6.11M |
|
1419
PUT
Vroom Inc
VRM
$36.9M
| $3.86M | ﹤0.01% |
1,154
+1,146
| +14,325% | +$3.9M |
|
1420
CALL
Travelers Companies
TRV
$80.8B
| $3.86M | ﹤0.01% |
25,800
+25,737
| +40,852% | +$3.99M |
|
1421
Diamondback Energy
FANG
$57.6B
| $3.86M | ﹤0.01% |
+41,105
| New | +$3.39M |
|
1422
CALL
Macerich
MAC
$7.32B
| $3.86M | ﹤0.01% |
+211,500
| New | +$3.17M |
|
1423
CALL
Booz Allen Hamilton
BAH
$8.7B
| $3.86M | ﹤0.01% |
45,300
+44,751
| +8,151% | +$3.78M |
|
1424
CALL
Deutsche Bank
DB
$66.3B
| $3.86M | ﹤0.01% |
294,900
+292,292
| +11,208% | +$3.96M |
|
1425
CALL
Winnebago Industries
WGO
$870M
| $3.85M | ﹤0.01% |
56,600
+56,527
| +77,434% | +$4.17M |
|
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.