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 | |
|---|---|---|---|---|---|---|
4501
PUT
First Financial Bankshares
FFIN
$5.05B
| $168K | ﹤0.01% |
5,900
+4,100
| +228% | +$116K |
|
4502
PUT
MasterCraft Boat Holdings
MCFT
$596M
| $168K | ﹤0.01% |
5,500
+5,100
| +1,275% | +$147K |
|
4503
SKYX Platforms
SKYX
$143M
| $168K | ﹤0.01% |
63,296
+17,367
| +38% | +$55.8K |
|
4504
PUT
Upwork
UPWK
$1.18B
| $168K | ﹤0.01% |
18,000
-400
| -2% | -$3.62K |
|
4505
Beyond Meat
BYND
$274M
| $167K | ﹤0.01% |
12,879
+11,929
| +1,256% | +$151K |
|
4506
CALL
Immersion
IMMR
$243M
| $167K | ﹤0.01% |
23,700
-5,800
| -20% | -$42.9K |
|
4507
CALL
Jack Henry & Associates
JKHY
$11.4B
| $167K | ﹤0.01% |
1,000
-12,600
| -93% | -$1.96M |
|
4508
PUT
Redwire
RDW
$1.86B
| $167K | ﹤0.01% |
65,500
-29,500
| -31% | -$80.4K |
|
4509
CALL
TH International
THCH
$57.7M
| $167K | ﹤0.01% |
11,640
-20,000
| -63% | -$359K |
|
4510
CALL
Westlake Chemical Partners
WLKP
$772M
| $167K | ﹤0.01% |
7,700
+100
| +1% | +$2.19K |
|
|
AZEK
4511
CALL
DELISTED
The AZEK Co
AZEK
| $166K | ﹤0.01% |
5,500
-6,700
| -55% | -$173K |
|
4512
Bio-Rad Laboratories Class A
BIO
$8.76B
| $166K | ﹤0.01% |
440
-531
| -55% | -$216K |
|
4513
CALL
Compass
COMP
$8.67B
| $166K | ﹤0.01% |
47,600
+20,800
| +78% | +$68.2K |
|
4514
CALL
GoPro
GPRO
$120M
| $166K | ﹤0.01% |
40,300
-25,700
| -39% | -$110K |
|
4515
PUT
NiSource
NI
$21.5B
| $166K | ﹤0.01% |
6,100
| – | – |
|
4516
PUT
Zurn Elkay Water Solutions
ZWS
$8.6B
| $166K | ﹤0.01% |
+6,200
| New | +$141K |
|
|
DNMR
4517
PUT
DELISTED
Danimer Scientific, Inc.
DNMR
| $166K | ﹤0.01% |
1,748
-480
| -22% | -$61.6K |
|
4518
PUT
Alphatec Holdings
ATEC
$1.48B
| $165K | ﹤0.01% |
9,200
+7,700
| +513% | +$120K |
|
4519
iShares US Oil & Gas Exploration & Production ETF
IEO
$566M
| $165K | ﹤0.01% |
1,943
-805
| -29% | -$67.6K |
|
4520
Life Time Group Holdings
LTH
$10.2B
| $165K | ﹤0.01% |
+8,395
| New | +$161K |
|
4521
CALL
Photronics
PLAB
$1.65B
| $165K | ﹤0.01% |
6,400
-6,400
| -50% | -$119K |
|
4522
CALL
Rigel Pharmaceuticals
RIGL
$723M
| $165K | ﹤0.01% |
12,860
+2,380
| +23% | +$32.2K |
|
4523
RenaissanceRe
RNR
$13.8B
| $165K | ﹤0.01% |
886
+162
| +22% | +$32.2K |
|
4524
CALL
Xenon Pharmaceuticals
XENE
$6.1B
| $165K | ﹤0.01% |
4,300
-46,800
| -92% | -$1.86M |
|
|
CD
4525
PUT
DELISTED
Chindata Group Holdings Limited American Depositary Shares
CD
| $165K | ﹤0.01% |
23,100
+10,400
| +82% | +$66.4K |
|
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.