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 |
Microsoft
MSFT
|
+$53.9M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$52.9M |
| 3 |
NVIDIA
NVDA
|
+$47.1M |
| 4 |
PayPal
PYPL
|
+$41.7M |
| 5 |
Alphabet (Google) Class C
GOOG
|
+$28.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$51.4M |
| 2 |
Walmart Inc
WMT
|
+$46.4M |
| 3 |
VanEck Oil Services ETF
OIH
|
+$34.2M |
| 4 |
Adobe
ADBE
|
+$33.5M |
| 5 |
Starbucks
SBUX
|
+$26.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Healthcare | 0.21% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.2% |
| 5 | Financials | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2826
PUT
Stem
STEM
$50.1M
| $789K | ﹤0.01% |
6,900
-3,165
| -31% | -$314K |
|
2827
PUT
Innovative Industrial Properties
IIPR
$1.79B
| $788K | ﹤0.01% |
10,800
-6,700
| -38% | -$472K |
|
2828
STAAR Surgical
STAA
$1.15B
| $788K | ﹤0.01% |
15,003
+5,691
| +61% | +$347K |
|
|
BLUE
2829
DELISTED
bluebird bio
BLUE
| $787K | ﹤0.01% |
11,965
-2,105
| -15% | -$154K |
|
2830
CALL
Vaalco Energy
EGY
$562M
| $787K | ﹤0.01% |
209,400
+12,000
| +6% | +$49K |
|
2831
CALL
Boise Cascade
BCC
$2.75B
| $786K | ﹤0.01% |
8,700
-900
| -9% | -$65.7K |
|
2832
iShares US Regional Banks ETF
IAT
$672M
| $786K | ﹤0.01% |
23,248
+11,543
| +99% | +$388K |
|
2833
PUT
Mettler-Toledo International
MTD
$26.9B
| $786K | ﹤0.01% |
600
-1,600
| -73% | -$2.25M |
|
2834
PUT
Nokia
NOK
$50.3B
| $786K | ﹤0.01% |
189,000
+42,500
| +29% | +$180K |
|
2835
PUT
Old National Bancorp
ONB
$10.1B
| $786K | ﹤0.01% |
56,400
+100
| +0.2% | +$1.33K |
|
2836
Wolfspeed
WOLF
$1.18B
| $786K | ﹤0.01% |
14,157
+7,275
| +106% | +$371K |
|
2837
PUT
Copa Holdings
CPA
$5.61B
| $785K | ﹤0.01% |
7,100
+5,100
| +255% | +$511K |
|
|
JKS
2838
CALL
JinkoSolar
JKS
$792M
| $785K | ﹤0.01% |
17,700
-19,100
| -52% | -$864K |
|
2839
CALL
Bruker
BRKR
$9.15B
| $783K | ﹤0.01% |
10,600
+10,400
| +5,200% | +$793K |
|
|
CIVI
2840
PUT
DELISTED
Civitas Resources
CIVI
| $783K | ﹤0.01% |
11,300
-20,600
| -65% | -$1.42M |
|
|
SAFE
2841
PUT
Safehold
SAFE
$1.2B
| $783K | ﹤0.01% |
39,500
-13,100
| -25% | -$347K |
|
2842
Direxion Daily Technology Bear 3x ETF
TECS
$74M
| $783K | ﹤0.01% |
571
+568
| +18,933% | +$1.09M |
|
2843
Chemours
CC
$2.54B
| $780K | ﹤0.01% |
+21,148
| New | +$645K |
|
2844
PUT
Chefs' Warehouse
CHEF
$3.86B
| $779K | ﹤0.01% |
21,800
-29,900
| -58% | -$991K |
|
2845
PUT
indie Semiconductor
INDI
$695M
| $778K | ﹤0.01% |
82,800
+12,000
| +17% | +$108K |
|
2846
Global X Lithium & Battery Tech ETF
LIT
$1.49B
| $778K | ﹤0.01% |
11,970
+3,396
| +40% | +$212K |
|
2847
Direxion Daily Gold Miners Index Bull 2X ETF
NUGT
$881M
| $776K | ﹤0.01% |
22,267
-158,185
| -88% | -$6.63M |
|
|
MDC
2848
CALL
DELISTED
M.D.C. Holdings, Inc.
MDC
| $776K | ﹤0.01% |
16,600
+13,700
| +472% | +$570K |
|
2849
CALL
Procore
PCOR
$7.06B
| $774K | ﹤0.01% |
11,900
+10,700
| +892% | +$629K |
|
2850
CALL
Leggett & Platt
LEG
$1.5B
| $773K | ﹤0.01% |
26,100
-25,400
| -49% | -$799K |
|
Similar funds
Simplex Trading's Q2 2023 Portfolio in Review
As of Q2 2023, Simplex Trading held 10,535 positions worth $122B, up 6.9% from $114B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q2 2023 filing shows 1,474 new, 3,350 increased, 3,913 reduced and 1,517 closed positions. Its largest new stake was Microsoft: 171,935 shares worth $58.5M. The largest sale was Apple, an estimated $51.4M.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.42% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q2 2023 buy was Microsoft: 171,935 shares worth $58.5M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q2 2023, an estimated $52.9M increase.
- Simplex Trading's biggest Q2 2023 reduction was Adobe, cutting an estimated $33.5M.
- Simplex Trading fully exited Apple in Q2 2023, selling an estimated $51.4M.
- Simplex Trading's ten largest holdings make up 43% of its $122B portfolio in Q2 2023.
- Simplex Trading opened 1,474 new positions and closed 1,517 in Q2 2023.
- Simplex Trading's portfolio value rose 6.9% quarter-over-quarter to $122B.
Based on Simplex Trading's 13F filing for Q2 2023, filed 4 Aug 2023.