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 | |
|---|---|---|---|---|---|---|
|
EFOR
4076
PUT
Everforth Inc
EFOR
$971M
| $242K | ﹤0.01% |
3,200
-600
| -16% | -$43.1K |
|
4077
PUT
Cogent Communications
CCOI
$600M
| $242K | ﹤0.01% |
3,600
+3,300
| +1,100% | +$216K |
|
4078
PUT
Commercial Metals
CMC
$7.61B
| $242K | ﹤0.01% |
4,600
+200
| +5% | +$9.33K |
|
|
VISN
4079
PUT
Vistance Networks Inc
VISN
$2.64B
| $242K | ﹤0.01% |
43,000
-40,500
| -49% | -$194K |
|
4080
PUT
CVR Partners
UAN
$1.28B
| $242K | ﹤0.01% |
3,000
-62,400
| -95% | -$5.47M |
|
|
ENFN
4081
CALL
DELISTED
Enfusion, Inc.
ENFN
| $242K | ﹤0.01% |
+21,600
| New | +$192K |
|
4082
Cipher Digital
CIFR
$7.61B
| $241K | ﹤0.01% |
84,319
-8,152
| -9% | -$20.1K |
|
4083
CALL
Carpenter Technology
CRS
$26.8B
| $241K | ﹤0.01% |
4,300
-1,200
| -22% | -$58.7K |
|
4084
Manulife Financial
MFC
$73.5B
| $241K | ﹤0.01% |
+12,765
| New | +$244K |
|
4085
Natera
NTRA
$35.9B
| $241K | ﹤0.01% |
+4,960
| New | +$253K |
|
4086
CALL
Amcor
AMCR
$21B
| $240K | ﹤0.01% |
4,820
-10,720
| -69% | -$559K |
|
4087
PUT
California Resources
CRC
$4.53B
| $240K | ﹤0.01% |
5,300
-500
| -9% | -$20.3K |
|
|
OPI
4088
DELISTED
Office Properties Income Trust
OPI
| $240K | ﹤0.01% |
31,223
+24,403
| +358% | +$185K |
|
4089
CALL
Cooper-Standard Automotive
CPS
$547M
| $239K | ﹤0.01% |
16,800
+2,500
| +17% | +$30.5K |
|
4090
CALL
Edgewell Personal Care
EPC
$1.29B
| $239K | ﹤0.01% |
5,800
+4,400
| +314% | +$188K |
|
|
SCPH
4091
DELISTED
scPharmaceuticals
SCPH
| $239K | ﹤0.01% |
23,528
+16,036
| +214% | +$167K |
|
4092
PUT
ProShares UltraShort Industrials
SIJ
$5.93M
| $239K | ﹤0.01% |
2,350
-1,175
| -33% | -$69.4K |
|
4093
PUT
CDW
CDW
$18.7B
| $238K | ﹤0.01% |
1,300
+300
| +30% | +$52.4K |
|
4094
Casella Waste Systems
CWST
$5.83B
| $238K | ﹤0.01% |
+2,639
| New | +$235K |
|
4095
Fortinet
FTNT
$107B
| $238K | ﹤0.01% |
3,150
| – | – |
|
4096
CALL
Green Brick Partners
GRBK
$3.17B
| $238K | ﹤0.01% |
4,200
-6,200
| -60% | -$289K |
|
|
GRFS
4097
Grifois
GRFS
$5.59B
| $238K | ﹤0.01% |
26,049
-131
| -0.5% | -$1.08K |
|
4098
PUT
Magnite
MGNI
$2.82B
| $238K | ﹤0.01% |
17,500
-26,600
| -60% | -$296K |
|
4099
CALL
Woodside Energy
WDS
$43.9B
| $238K | ﹤0.01% |
10,300
-4,200
| -29% | -$96.2K |
|
|
NVRO
4100
PUT
DELISTED
NEVRO CORP.
NVRO
| $238K | ﹤0.01% |
9,400
-48,600
| -84% | -$1.4M |
|
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.