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 | |
|---|---|---|---|---|---|---|
|
MAXN
2426
CALL
DELISTED
Maxeon Solar Technologies
MAXN
| $1.66M | ﹤0.01% |
773
+770
| +25,667% | +$1.45M |
|
|
MPT
2427
CALL
Medical Properties Trust
MPT
$2.89B
| $1.66M | ﹤0.01% |
82,400
+81,866
| +15,331% | +$1.75M |
|
2428
CALL
Omnicom Group
OMC
$22.7B
| $1.66M | ﹤0.01% |
20,700
+20,504
| +10,461% | +$1.67M |
|
2429
CALL
Seres Therapeutics
MCRB
$48M
| $1.65M | ﹤0.01% |
3,465
+3,414
| +6,694% | +$1.44M |
|
2430
Nexstar Media Group
NXST
$5.6B
| $1.65M | ﹤0.01% |
11,174
-3,847
| -26% | -$572K |
|
|
FL
2431
CALL
DELISTED
Foot Locker
FL
| $1.65M | ﹤0.01% |
26,800
+25,978
| +3,160% | +$1.57M |
|
2432
CALL
Mid-America Apartment Communities
MAA
$15.6B
| $1.65M | ﹤0.01% |
9,800
+9,709
| +10,669% | +$1.55M |
|
|
TUP
2433
CALL
DELISTED
Tupperware Brands Corporation
TUP
| $1.65M | ﹤0.01% |
69,500
+69,261
| +28,979% | +$1.76M |
|
2434
Amgen
AMGN
$203B
| $1.65M | ﹤0.01% |
+6,766
| New | +$1.66M |
|
|
DAY
2435
PUT
DELISTED
Dayforce
DAY
| $1.65M | ﹤0.01% |
17,200
+17,035
| +10,324% | +$1.54M |
|
2436
CALL
EPR Properties
EPR
$4.86B
| $1.65M | ﹤0.01% |
31,300
+30,492
| +3,774% | +$1.52M |
|
2437
Marathon Digital Holdings
MARA
$4.62B
| $1.65M | ﹤0.01% |
52,460
-337,908
| -87% | -$10.7M |
|
2438
PUT
J.M. Smucker
SJM
$12.6B
| $1.65M | ﹤0.01% |
12,700
+12,495
| +6,095% | +$1.66M |
|
2439
CALL
McKesson
MCK
$98.5B
| $1.64M | ﹤0.01% |
+8,600
| New | +$1.66M |
|
2440
PUT
Magnite
MGNI
$2.65B
| $1.64M | ﹤0.01% |
48,600
+47,707
| +5,342% | +$1.62M |
|
2441
PUT
Targa Resources
TRGP
$60.4B
| $1.64M | ﹤0.01% |
37,000
+36,792
| +17,688% | +$1.42M |
|
2442
PUT
AGCO
AGCO
$8.78B
| $1.64M | ﹤0.01% |
12,600
+12,593
| +179,900% | +$1.77M |
|
|
GOOS
2443
Canada Goose Holdings
GOOS
$868M
| $1.64M | ﹤0.01% |
37,523
+3,821
| +11% | +$156K |
|
|
SEAH
2444
PUT
DELISTED
Sports Entertainment Acquisition Corp.
SEAH
| $1.64M | ﹤0.01% |
162,800
+162,584
| +75,270% | +$1.64M |
|
|
CCXI
2445
DELISTED
ChemoCentryx, Inc.
CCXI
| $1.64M | ﹤0.01% |
+122,500
| New | +$3.02M |
|
2446
CALL
Trane Technologies
TT
$106B
| $1.64M | ﹤0.01% |
8,900
+8,824
| +11,611% | +$1.57M |
|
|
CVM.WS
2447
PUT
DELISTED
Cel-Sci Corp Series S
CVM.WS
| $1.64M | ﹤0.01% |
188,600
+185,927
| +6,956% | +$1.61M |
|
2448
PUT
Fox Class B
FOX
$20.7B
| $1.64M | ﹤0.01% |
44,100
+43,087
| +4,253% | +$1.56M |
|
2449
CALL
Synaptics
SYNA
$4.41B
| $1.63M | ﹤0.01% |
10,500
+10,490
| +104,900% | +$1.42M |
|
2450
CALL
Zevra Therapeutics
ZVRA
$563M
| $1.63M | ﹤0.01% |
127,400
+126,593
| +15,687% | +$1.36M |
|
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.