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 | |
|---|---|---|---|---|---|---|
2551
NNN REIT
NNN
$9.39B
| $1.51M | ﹤0.01% |
32,223
+21,329
| +196% | +$999K |
|
2552
CALL
Saic
SAIC
$5.03B
| $1.51M | ﹤0.01% |
17,200
+16,932
| +6,318% | +$1.51M |
|
2553
CALL
Pediatrix Medical
MD
$2.16B
| $1.51M | ﹤0.01% |
50,000
+49,708
| +17,023% | +$1.47M |
|
2554
PUT
Quantum-Si Incorporated
QSI
$168M
| $1.51M | ﹤0.01% |
123,000
+121,886
| +10,941% | +$1.28M |
|
2555
PUT
Manhattan Associates
MANH
$8.97B
| $1.51M | ﹤0.01% |
10,400
+10,397
| +346,567% | +$1.38M |
|
2556
CALL
Rekor Systems
REKR
$83.8M
| $1.5M | ﹤0.01% |
147,900
+147,421
| +30,777% | +$2.26M |
|
|
MRTX
2557
CALL
DELISTED
Mirati Therapeutics, Inc. Common Stock
MRTX
| $1.5M | ﹤0.01% |
9,300
+9,085
| +4,226% | +$1.46M |
|
2558
PUT
JB Hunt Transport Services
JBHT
$27.1B
| $1.5M | ﹤0.01% |
9,200
+8,970
| +3,900% | +$1.51M |
|
2559
CALL
MillerKnoll
MLKN
$1.5B
| $1.5M | ﹤0.01% |
31,800
+31,763
| +85,846% | +$1.44M |
|
2560
LiveRamp
RAMP
$2.29B
| $1.5M | ﹤0.01% |
31,983
+29,670
| +1,283% | +$1.43M |
|
2561
Devon Energy
DVN
$51.9B
| $1.5M | ﹤0.01% |
+51,224
| New | +$1.32M |
|
2562
Under Armour Class C
UA
$2.92B
| $1.49M | ﹤0.01% |
80,480
-119,801
| -60% | -$2.26M |
|
2563
Cadence Design Systems
CDNS
$90B
| $1.49M | ﹤0.01% |
10,916
+4,123
| +61% | +$546K |
|
2564
Viatris
VTRS
$20.1B
| $1.49M | ﹤0.01% |
104,384
-69,088
| -40% | -$1,000K |
|
|
ONEM
2565
CALL
DELISTED
1Life Healthcare
ONEM
| $1.49M | ﹤0.01% |
45,100
+44,813
| +15,614% | +$1.69M |
|
2566
CALL
Stride
LRN
$3.69B
| $1.49M | ﹤0.01% |
46,400
+46,003
| +11,588% | +$1.37M |
|
|
SUMO
2567
PUT
DELISTED
Sumo Logic, Inc. Common Stock
SUMO
| $1.49M | ﹤0.01% |
72,200
+71,554
| +11,076% | +$1.38M |
|
|
IAA
2568
DELISTED
IAA, Inc. Common Stock
IAA
| $1.49M | ﹤0.01% |
27,305
+17,328
| +174% | +$995K |
|
2569
CALL
Ross Stores
ROST
$76.6B
| $1.49M | ﹤0.01% |
12,000
+11,953
| +25,432% | +$1.49M |
|
2570
PUT
Fomento Económico Mexicano
FMX
$43.3B
| $1.49M | ﹤0.01% |
17,600
+17,524
| +23,058% | +$1.44M |
|
2571
ProShares Short VIX Short-Term Futures ETF
SVXY
$220M
| $1.49M | ﹤0.01% |
53,542
+22,122
| +70% | +$565K |
|
|
HIBB
2572
CALL
DELISTED
Hibbett, Inc. Common Stock
HIBB
| $1.49M | ﹤0.01% |
16,600
+16,345
| +6,410% | +$1.28M |
|
|
ZNGA
2573
DELISTED
ZYNGA INC. CL A COMMON
ZNGA
| $1.49M | ﹤0.01% |
139,870
+63,976
| +84% | +$674K |
|
2574
CALL
Sonoco
SON
$5.76B
| $1.49M | ﹤0.01% |
22,200
+22,199
| +2,219,900% | +$1.47M |
|
2575
CALL
BCE
BCE
$19.9B
| $1.48M | ﹤0.01% |
30,100
+29,871
| +13,044% | +$1.45M |
|
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.