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 | |
|---|---|---|---|---|---|---|
5426
PUT
Horizon Technology Finance
HRZN
$298M
| $74K | ﹤0.01% |
6,200
-400
| -6% | -$4.79K |
|
|
MLNK
5427
PUT
DELISTED
MeridianLink
MLNK
| $74K | ﹤0.01% |
3,600
| – | – |
|
|
MREO
5428
CALL
Mereo BioPharma
MREO
$51.9M
| $74K | ﹤0.01% |
56,400
+23,000
| +69% | +$26.7K |
|
5429
CALL
OceanFirst Financial
OCFC
$1.69B
| $74K | ﹤0.01% |
+4,800
| New | +$74.9K |
|
5430
CALL
Stellus Capital Investment Corp
SCM
$212M
| $74K | ﹤0.01% |
5,300
+5,200
| +5,200% | +$73.8K |
|
5431
PUT
Tenable Holdings
TENB
$3.6B
| $74K | ﹤0.01% |
1,700
-1,900
| -53% | -$77.6K |
|
5432
State Street SPDR S&P Oil & Gas Equipment & Services ETF
XES
$370M
| $74K | ﹤0.01% |
948
+403
| +74% | +$29.6K |
|
|
ITI
5433
CALL
DELISTED
Iteris, Inc.
ITI
| $74K | ﹤0.01% |
18,700
+14,500
| +345% | +$64.7K |
|
|
BRY
5434
CALL
DELISTED
Berry Corp
BRY
| $73K | ﹤0.01% |
10,700
+7,300
| +215% | +$52.6K |
|
5435
Lightwave Logic
LWLG
$971M
| $73K | ﹤0.01% |
10,493
-13,844
| -57% | -$80.5K |
|
|
MRUS
5436
CALL
DELISTED
Merus
MRUS
| $73K | ﹤0.01% |
2,800
-5,400
| -66% | -$118K |
|
5437
Microvast
MVST
$273M
| $73K | ﹤0.01% |
45,881
-3,232
| -7% | -$4.61K |
|
5438
CALL
Ocean Power Technologies
OPTT
$48.1M
| $73K | ﹤0.01% |
123,300
+12,200
| +11% | +$6.69K |
|
|
REVG
5439
DELISTED
REV Group
REVG
| $73K | ﹤0.01% |
5,544
+4,144
| +296% | +$47.3K |
|
|
SLRN
5440
DELISTED
ACELYRIN
SLRN
| $73K | ﹤0.01% |
+3,511
| New | +$71.8K |
|
5441
Sterling Infrastructure
STRL
$18.4B
| $73K | ﹤0.01% |
1,314
-283
| -18% | -$12.5K |
|
5442
CALL
Alaunos Therapeutics
TCRT
$4.66M
| $73K | ﹤0.01% |
955
-494
| -34% | -$40K |
|
5443
CALL
Zymeworks
ZYME
$1.61B
| $73K | ﹤0.01% |
8,500
-22,100
| -72% | -$198K |
|
|
PDCO
5444
PUT
DELISTED
Patterson Companies, Inc.
PDCO
| $73K | ﹤0.01% |
2,200
-4,500
| -67% | -$124K |
|
5445
CALL
Anika Therapeutics
ANIK
$246M
| $72K | ﹤0.01% |
2,800
-200
| -7% | -$5.35K |
|
5446
CALL
Aqua Metals
AQMS
$9.46M
| $72K | ﹤0.01% |
310
-141
| -31% | -$30.7K |
|
5447
Atara Biotherapeutics
ATRA
$72.5M
| $72K | ﹤0.01% |
1,811
+1,285
| +244% | +$72.7K |
|
5448
PUT
Carpenter Technology
CRS
$25.7B
| $72K | ﹤0.01% |
1,300
+600
| +86% | +$29.4K |
|
5449
State Street SPDR Bloomberg Convertible Securities ETF
CWB
$5.57B
| $72K | ﹤0.01% |
1,040
+977
| +1,551% | +$65.7K |
|
5450
8x8 Inc
EGHT
$261M
| $72K | ﹤0.01% |
17,029
+9,918
| +139% | +$35.7K |
|
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.