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 | |
|---|---|---|---|---|---|---|
|
CBAY
2526
CALL
DELISTED
Cymabay Therapeutics
CBAY
| $1.09M | ﹤0.01% |
99,700
-18,600
| -16% | -$173K |
|
2527
CALL
Jones Lang LaSalle
JLL
$15.1B
| $1.09M | ﹤0.01% |
7,000
+6,600
| +1,650% | +$936K |
|
2528
PUT
Repligen
RGEN
$7.44B
| $1.09M | ﹤0.01% |
7,700
+7,200
| +1,440% | +$1.15M |
|
2529
CALL
DoubleVerify
DV
$1.62B
| $1.08M | ﹤0.01% |
27,900
+15,600
| +127% | +$503K |
|
2530
PUT
Newell Brands
NWL
$2.16B
| $1.08M | ﹤0.01% |
124,600
+78,500
| +170% | +$781K |
|
2531
CALL
Pliant Therapeutics
PLRX
$67.5M
| $1.08M | ﹤0.01% |
59,800
+23,700
| +66% | +$561K |
|
2532
CALL
Pinnacle West Capital
PNW
$12.9B
| $1.08M | ﹤0.01% |
13,300
+2,900
| +28% | +$231K |
|
2533
Rio Tinto
RIO
$148B
| $1.08M | ﹤0.01% |
16,965
-37,208
| -69% | -$2.39M |
|
|
AZUL
2534
PUT
DELISTED
Azul
AZUL
| $1.08M | ﹤0.01% |
79,100
-76,000
| -49% | -$691K |
|
|
PLL
2535
PUT
DELISTED
Piedmont Lithium
PLL
| $1.08M | ﹤0.01% |
18,700
+700
| +4% | +$40.1K |
|
2536
CALL
Transmedics
TMDX
$2.5B
| $1.07M | ﹤0.01% |
12,800
-19,100
| -60% | -$1.46M |
|
2537
PUT
Invesco Equal Weight 0-30 Year Treasury ETF
GOVI
$1.22B
| $1.07M | ﹤0.01% |
27,000
-24,600
| -48% | -$728K |
|
2538
PUT
Sunoco
SUN
$14.2B
| $1.07M | ﹤0.01% |
24,600
-2,000
| -8% | -$88.5K |
|
|
CERE
2539
PUT
DELISTED
Cerevel Therapeutics Holdings, Inc. Common Stock
CERE
| $1.07M | ﹤0.01% |
33,700
-16,100
| -32% | -$494K |
|
2540
PUT
Eos Energy Enterprises
EOSE
$1.23B
| $1.06M | ﹤0.01% |
245,500
+215,500
| +718% | +$565K |
|
2541
PUT
Hormel Foods
HRL
$13.9B
| $1.06M | ﹤0.01% |
26,500
-130,700
| -83% | -$5.24M |
|
2542
PUT
J.M. Smucker
SJM
$12.6B
| $1.06M | ﹤0.01% |
7,200
-19,500
| -73% | -$2.97M |
|
|
ABCM
2543
DELISTED
Abcam PLC
ABCM
| $1.06M | ﹤0.01% |
43,419
+40,625
| +1,454% | +$701K |
|
2544
PUT
HEICO Corp Class A
HEI.A
$35.4B
| $1.06M | ﹤0.01% |
6,000
+5,700
| +1,900% | +$764K |
|
|
TE
2545
CALL
T1 Energy
TE
$1.4B
| $1.06M | ﹤0.01% |
113,500
+18,000
| +19% | +$135K |
|
2546
CALL
Texas Roadhouse
TXRH
$12.7B
| $1.05M | ﹤0.01% |
9,400
+4,300
| +84% | +$473K |
|
2547
CALL
Guardant Health
GH
$19.5B
| $1.05M | ﹤0.01% |
29,400
-76,000
| -72% | -$2.18M |
|
2548
Myriad Genetics
MYGN
$530M
| $1.05M | ﹤0.01% |
45,387
+28,685
| +172% | +$626K |
|
2549
CALL
NeoGenomics
NEO
$1.81B
| $1.05M | ﹤0.01% |
65,500
-7,000
| -10% | -$115K |
|
2550
PUT
United Microelectronic
UMC
$48.9B
| $1.05M | ﹤0.01% |
133,400
+101,800
| +322% | +$839K |
|
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.