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 | |
|---|---|---|---|---|---|---|
|
UFOX
4251
Defiance Space and Connective Tech ETF
UFOX
$825M
| $472K | ﹤0.01% |
12,423
+6,889
| +124% | +$252K |
|
|
ASXC
4252
PUT
DELISTED
Asensus Surgical, Inc.
ASXC
| $472K | ﹤0.01% |
+149,000
| New | +$372K |
|
4253
CALL
CBRE Group
CBRE
$43.1B
| $471K | ﹤0.01% |
5,500
+5,356
| +3,719% | +$457K |
|
4254
ClearPoint Neuro
CLPT
$436M
| $471K | ﹤0.01% |
24,710
+21,639
| +705% | +$418K |
|
|
LADR
4255
CALL
Ladder Capital
LADR
$1.25B
| $471K | ﹤0.01% |
40,900
+40,613
| +14,151% | +$477K |
|
|
NAGE
4256
CALL
Niagen Bioscience
NAGE
$262M
| $471K | ﹤0.01% |
47,800
+47,171
| +7,499% | +$411K |
|
|
VRAY
4257
CALL
DELISTED
ViewRay, Inc.
VRAY
| $471K | ﹤0.01% |
71,500
+71,346
| +46,329% | +$380K |
|
4258
Direxion Daily Gold Miners Index Bear 2X ETF
DUST
$70.9M
| $470K | ﹤0.01% |
246
-44
| -15% | -$75.8K |
|
4259
Principal Financial Group
PFG
$24.5B
| $470K | ﹤0.01% |
7,442
-975
| -12% | -$62.3K |
|
4260
CALL
Genesis Energy
GEL
$1.81B
| $469K | ﹤0.01% |
40,400
+39,860
| +7,381% | +$402K |
|
4261
PUT
Immersion
IMMR
$254M
| $469K | ﹤0.01% |
53,500
+53,052
| +11,842% | +$455K |
|
4262
Leggett & Platt
LEG
$1.47B
| $469K | ﹤0.01% |
9,059
+7,120
| +367% | +$371K |
|
4263
Workiva
WK
$3.28B
| $469K | ﹤0.01% |
4,214
+1,843
| +78% | +$179K |
|
|
GTHX
4264
PUT
DELISTED
G1 Therapeutics, Inc. Common Stock
GTHX
| $469K | ﹤0.01% |
21,400
+21,130
| +7,826% | +$469K |
|
|
CONN
4265
PUT
DELISTED
Conn's Inc.
CONN
| $469K | ﹤0.01% |
18,400
+18,160
| +7,567% | +$419K |
|
4266
PUT
Amcor
AMCR
$21.6B
| $468K | ﹤0.01% |
8,180
+8,104
| +10,663% | +$482K |
|
4267
Lakeland Industries
LAKE
$106M
| $467K | ﹤0.01% |
20,916
+19,809
| +1,789% | +$511K |
|
|
ORGN
4268
PUT
DELISTED
Origin Materials
ORGN
| $467K | ﹤0.01% |
1,900
+1,779
| +1,470% | +$530K |
|
|
TXNM
4269
TXNM Energy Inc
TXNM
$6.43B
| $467K | ﹤0.01% |
9,577
+2,188
| +30% | +$108K |
|
|
SYRS
4270
PUT
DELISTED
Syros Pharmaceuticals, Inc. Common Stock
SYRS
| $467K | ﹤0.01% |
8,580
+8,499
| +10,493% | +$503K |
|
|
PETQ
4271
CALL
DELISTED
PetIQ, Inc. Class A Common Stock
PETQ
| $467K | ﹤0.01% |
12,100
+12,060
| +30,150% | +$481K |
|
|
MMAT
4272
CALL
DELISTED
Meta Materials Inc. Common Stock
MMAT
| $467K | ﹤0.01% |
+2,157
| New | +$1.2M |
|
|
ACR
4273
CALL
ACRES Commercial Realty
ACR
$129M
| $465K | ﹤0.01% |
28,984
+28,604
| +7,527% | +$456K |
|
|
DRD
4274
CALL
DRDGold
DRD
$1.79B
| $465K | ﹤0.01% |
42,800
+42,532
| +15,870% | +$473K |
|
|
FREE
4275
PUT
DELISTED
Whole Earth Brands, Inc. Class A Common Stock
FREE
| $465K | ﹤0.01% |
32,100
+31,980
| +26,650% | +$427K |
|
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.