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 | |
|---|---|---|---|---|---|---|
2576
CALL
Mirion Technologies
MIR
$4.05B
| $1.02M | ﹤0.01% |
121,000
-31,600
| -21% | -$256K |
|
2577
PUT
United States Copper Index Fund
CPER
$742M
| $1.02M | ﹤0.01% |
44,000
+36,600
| +495% | +$864K |
|
2578
CALL
Sigma Lithium
SGML
$1.08B
| $1.02M | ﹤0.01% |
25,300
-24,900
| -50% | -$949K |
|
2579
PUT
BRC Group Holdings
RILY
$277M
| $1.02M | ﹤0.01% |
22,100
-197,100
| -90% | -$6.94M |
|
2580
CALL
GrowGeneration
GRWG
$82.9M
| $1.01M | ﹤0.01% |
298,800
+26,700
| +10% | +$94.5K |
|
2581
PUT
Gartner
IT
$9.41B
| $1.01M | ﹤0.01% |
2,900
-10,800
| -79% | -$3.52M |
|
2582
Rambus
RMBS
$10.4B
| $1.01M | ﹤0.01% |
15,831
+11,240
| +245% | +$619K |
|
2583
CALL
Service Corp International
SCI
$11.4B
| $1.01M | ﹤0.01% |
15,700
-16,300
| -51% | -$1.09M |
|
2584
PUT
NOV
NOV
$7.45B
| $1.01M | ﹤0.01% |
63,200
+60,300
| +2,079% | +$983K |
|
2585
CALL
Amphenol
APH
$188B
| $1.01M | ﹤0.01% |
23,800
-51,200
| -68% | -$1.99M |
|
2586
Innoviz Technologies
INVZ
$135M
| $1.01M | ﹤0.01% |
355,430
+44,179
| +14% | +$122K |
|
2587
PUT
Revvity
RVTY
$12.3B
| $1.01M | ﹤0.01% |
8,500
+6,200
| +270% | +$762K |
|
2588
CALL
Cemex
CX
$17.4B
| $1.01M | ﹤0.01% |
142,500
+75,700
| +113% | +$482K |
|
2589
CALL
Harmony Gold Mining
HMY
$9.92B
| $1.01M | ﹤0.01% |
240,000
+34,800
| +17% | +$160K |
|
2590
PUT
Jackson Financial
JXN
$8.32B
| $1.01M | ﹤0.01% |
32,900
+23,800
| +262% | +$767K |
|
2591
PUT
Shutterstock
SSTK
$205M
| $1.01M | ﹤0.01% |
20,700
+19,300
| +1,379% | +$1.1M |
|
2592
CALL
Terex
TEX
$7.98B
| $1M | ﹤0.01% |
16,800
+8,000
| +91% | +$397K |
|
2593
Vertiv
VRT
$112B
| $1M | ﹤0.01% |
40,591
-7,286
| -15% | -$125K |
|
2594
CALL
World Acceptance Corp
WRLD
$950M
| $1M | ﹤0.01% |
7,500
-9,600
| -56% | -$1.03M |
|
2595
CALL
Yeti Holdings
YETI
$3.82B
| $1M | ﹤0.01% |
25,900
-41,800
| -62% | -$1.62M |
|
2596
PUT
Hewlett Packard
HPE
$63.2B
| $1M | ﹤0.01% |
59,800
+42,400
| +244% | +$648K |
|
2597
CALL
InterDigital
IDCC
$6.68B
| $1M | ﹤0.01% |
10,400
+3,600
| +53% | +$292K |
|
|
EXAS
2598
DELISTED
Exact Sciences
EXAS
| $999K | ﹤0.01% |
10,643
+10,343
| +3,448% | +$807K |
|
2599
ResMed
RMD
$28.3B
| $998K | ﹤0.01% |
+4,572
| New | +$1.02M |
|
2600
CALL
Vipshop
VIPS
$6.84B
| $998K | ﹤0.01% |
60,500
+2,100
| +4% | +$32.9K |
|
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.