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 | |
|---|---|---|---|---|---|---|
|
VRAY
5651
DELISTED
ViewRay, Inc.
VRAY
| $60K | ﹤0.01% |
171,300
-163,337
| -49% | -$169K |
|
5652
CALL
American Financial Group
AFG
$11.8B
| $59K | ﹤0.01% |
500
-1,900
| -79% | -$224K |
|
5653
CALL
Argan
AGX
$8B
| $59K | ﹤0.01% |
1,500
+1,400
| +1,400% | +$56.6K |
|
5654
PUT
Cricut
CRCT
$984M
| $59K | ﹤0.01% |
4,900
+4,600
| +1,533% | +$50.3K |
|
5655
CALL
Amdocs
DOX
$5.92B
| $59K | ﹤0.01% |
600
+100
| +20% | +$9.41K |
|
5656
PUT
Cedar Fair
FUN
$1.77B
| $59K | ﹤0.01% |
1,500
+1,100
| +275% | +$47K |
|
5657
CALL
Hayward Holdings
HAYW
$3.21B
| $59K | ﹤0.01% |
4,600
+3,100
| +207% | +$35.8K |
|
5658
MeiraGTx Holdings
MGTX
$1.09B
| $59K | ﹤0.01% |
8,912
+8,005
| +883% | +$51.5K |
|
5659
CALL
Maximus
MMS
$3.17B
| $59K | ﹤0.01% |
700
-300
| -30% | -$24.7K |
|
5660
CALL
Movado Group
MOV
$849M
| $59K | ﹤0.01% |
2,200
-200
| -8% | -$5.23K |
|
|
NFGC
5661
PUT
New Found Gold
NFGC
$522M
| $59K | ﹤0.01% |
12,000
+6,600
| +122% | +$31.5K |
|
5662
PUT
Oxford Industries
OXM
$566M
| $59K | ﹤0.01% |
600
-2,800
| -82% | -$287K |
|
5663
CALL
POSCO
PKX
$16.1B
| $59K | ﹤0.01% |
800
-1,000
| -56% | -$72.7K |
|
5664
PUT
Ribbon Communications
RBBN
$377M
| $59K | ﹤0.01% |
21,400
-36,300
| -63% | -$101K |
|
5665
PUT
RPC Inc
RES
$1.24B
| $59K | ﹤0.01% |
8,300
-5,000
| -38% | -$36.6K |
|
5666
Rimini Street
RMNI
$445M
| $59K | ﹤0.01% |
12,362
+2,642
| +27% | +$10.9K |
|
|
SFIX
5667
Stitch Fix
SFIX
$536M
| $59K | ﹤0.01% |
+15,465
| New | +$58.6K |
|
5668
CALL
SLR Investment Corp
SLRC
$686M
| $59K | ﹤0.01% |
4,200
-3,700
| -47% | -$53K |
|
5669
PUT
Stagwell
STGW
$2.09B
| $59K | ﹤0.01% |
8,300
+6,000
| +261% | +$39.6K |
|
5670
PUT
TFS Financial
TFSL
$5.16B
| $59K | ﹤0.01% |
4,700
-1,600
| -25% | -$19.4K |
|
5671
PUT
Titan Machinery
TITN
$396M
| $59K | ﹤0.01% |
2,000
-5,500
| -73% | -$166K |
|
|
UCTT
5672
Ultra Clean Holdings
UCTT
$3.73B
| $59K | ﹤0.01% |
+1,544
| New | +$49.7K |
|
5673
Uranium Energy
UEC
$4.75B
| $59K | ﹤0.01% |
17,604
-19,093
| -52% | -$54.5K |
|
5674
CALL
Workhorse Group
WKHS
$33.2M
| $59K | ﹤0.01% |
23
+8
| +53% | +$23.1K |
|
5675
Watts Water Technologies
WTS
$11.5B
| $59K | ﹤0.01% |
323
-40
| -11% | -$6.69K |
|
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.