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 | |
|---|---|---|---|---|---|---|
4751
Protalix BioTherapeutics
PLX
$183M
| $132K | ﹤0.01% |
+66,379
| New | +$158K |
|
|
RNAM
4752
DELISTED
Avidity Biosciences
RNAM
| $132K | ﹤0.01% |
11,972
+2,725
| +29% | +$34.2K |
|
4753
CALL
Sanmina
SANM
$8.78B
| $132K | ﹤0.01% |
2,200
-4,800
| -69% | -$263K |
|
|
AVID
4754
PUT
DELISTED
Avid Technology Inc
AVID
| $132K | ﹤0.01% |
5,200
+4,300
| +478% | +$111K |
|
|
AHRT
4755
CALL
AH Realty Trust
AHRT
$536M
| $131K | ﹤0.01% |
11,300
-27,700
| -71% | -$323K |
|
4756
PUT
A.O. Smith
AOS
$8.55B
| $131K | ﹤0.01% |
1,800
-7,100
| -80% | -$486K |
|
4757
PUT
Avantor
AVTR
$9.73B
| $131K | ﹤0.01% |
6,400
+3,600
| +129% | +$72.8K |
|
4758
CRISPR Therapeutics
CRSP
$4.69B
| $131K | ﹤0.01% |
2,340
-13,437
| -85% | -$762K |
|
4759
CALL
Custom Truck One Source
CTOS
$2.21B
| $131K | ﹤0.01% |
19,500
+16,400
| +529% | +$108K |
|
4760
PUT
First American
FAF
$7.98B
| $131K | ﹤0.01% |
2,300
| – | – |
|
4761
CALL
Comfort Systems
FIX
$53.5B
| $131K | ﹤0.01% |
800
+700
| +700% | +$104K |
|
|
4762
PUT
Comfort Systems
FIX
$53.5B
| $131K | ﹤0.01% |
800
| – | – |
|
4763
PUT
Flowers Foods
FLO
$1.58B
| $131K | ﹤0.01% |
5,300
-11,100
| -68% | -$294K |
|
|
SA
4764
PUT
Seabridge Gold
SA
$2.72B
| $131K | ﹤0.01% |
10,900
+7,200
| +195% | +$97.9K |
|
4765
CALL
INNOVATE Corp
VATE
$106M
| $131K | ﹤0.01% |
7,500
-5,970
| -44% | -$128K |
|
|
VRE
4766
CALL
DELISTED
Veris Residential
VRE
| $131K | ﹤0.01% |
8,200
-2,300
| -22% | -$37.2K |
|
4767
West Pharmaceutical
WST
$23.7B
| $131K | ﹤0.01% |
+344
| New | +$123K |
|
4768
CALL
4D Molecular Therapeutics
FDMT
$502M
| $130K | ﹤0.01% |
7,200
-3,500
| -33% | -$64.4K |
|
4769
CALL
Renaissance International IPO ETF
IPOS
$10.7M
| $130K | ﹤0.01% |
4,000
+1,800
| +82% | +$28.5K |
|
4770
PUT
Rexford Industrial Realty
REXR
$8.63B
| $130K | ﹤0.01% |
2,500
+1,000
| +67% | +$54.5K |
|
4771
PUT
Surgery Partners
SGRY
$2.15B
| $130K | ﹤0.01% |
2,900
-600
| -17% | -$22.9K |
|
4772
CALL
Aclaris Therapeutics
ACRS
$715M
| $129K | ﹤0.01% |
12,500
-121,100
| -91% | -$1.1M |
|
4773
CALL
AMES National
ATLO
$271M
| $129K | ﹤0.01% |
+7,200
| New | +$135K |
|
4774
CALL
Endava
DAVA
$165M
| $129K | ﹤0.01% |
2,500
-4,600
| -65% | -$247K |
|
4775
Dine Brands
DIN
$462M
| $129K | ﹤0.01% |
2,239
+1,727
| +337% | +$110K |
|
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.