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 | |
|---|---|---|---|---|---|---|
5476
Century Aluminum
CENX
$4.43B
| $70K | ﹤0.01% |
+8,039
| New | +$69.9K |
|
5477
PUT
Comtech Telecommunications
CMTL
$50.3M
| $70K | ﹤0.01% |
7,700
+7,600
| +7,600% | +$81.6K |
|
5478
PUT
Definitive Healthcare
DH
$73.7M
| $70K | ﹤0.01% |
6,400
-800
| -11% | -$8.24K |
|
5479
CALL
GrafTech
EAF
$175M
| $70K | ﹤0.01% |
1,400
+1,050
| +300% | +$48.9K |
|
5480
Empire State Realty Trust
ESRT
$869M
| $70K | ﹤0.01% |
9,361
+8,198
| +705% | +$51.7K |
|
5481
CALL
Ethan Allen Interiors
ETD
$568M
| $70K | ﹤0.01% |
2,500
-2,900
| -54% | -$78.8K |
|
5482
PUT
Fate Therapeutics
FATE
$287M
| $70K | ﹤0.01% |
14,900
-9,000
| -38% | -$49.7K |
|
5483
CALL
Installed Building Products
IBP
$6.02B
| $70K | ﹤0.01% |
+500
| New | +$58.9K |
|
5484
CALL
Richardson Electronics
RELL
$270M
| $70K | ﹤0.01% |
4,300
+3,800
| +760% | +$65.7K |
|
|
QNTM
5485
CALL
Quantum Biopharma Class B Subordinate Voting Shares
QNTM
$18.6M
| $70K | ﹤0.01% |
942
-1,135
| -55% | -$97.4K |
|
|
ASRT
5486
PUT
DELISTED
Assertio
ASRT
| $69K | ﹤0.01% |
853
-13,480
| -94% | -$1.25M |
|
5487
Brilliant Earth
BRLT
$17.1M
| $69K | ﹤0.01% |
17,892
+1,003
| +6% | +$3.81K |
|
5488
CALL
GSI Technology
GSIT
$219M
| $69K | ﹤0.01% |
+12,600
| New | +$54.7K |
|
5489
PUT
HighPeak Energy
HPK
$917M
| $69K | ﹤0.01% |
6,400
+4,200
| +191% | +$70.7K |
|
5490
Kulicke & Soffa
KLIC
$4.76B
| $69K | ﹤0.01% |
1,171
+605
| +107% | +$31.2K |
|
|
MESO
5491
CALL
Mesoblast
MESO
$1.84B
| $69K | ﹤0.01% |
8,850
-250
| -3% | -$1.79K |
|
5492
SI-BONE Inc
SIBN
$788M
| $69K | ﹤0.01% |
2,579
+740
| +40% | +$18K |
|
5493
CVR Partners
UAN
$1.35B
| $69K | ﹤0.01% |
867
-10,157
| -92% | -$890K |
|
5494
CALL
US Commodity Index
USCI
$368M
| $69K | ﹤0.01% |
1,300
+900
| +225% | +$48.7K |
|
5495
PUT
VirTra
VTSI
$34.8M
| $69K | ﹤0.01% |
9,100
+7,700
| +550% | +$51.4K |
|
|
SLCA
5496
CALL
DELISTED
U.S. SILICA HOLDINGS, INC.
SLCA
| $69K | ﹤0.01% |
5,700
-2,700
| -32% | -$33.4K |
|
|
NSTG
5497
DELISTED
NanoString Technologies, Inc.
NSTG
| $69K | ﹤0.01% |
17,092
+13,335
| +355% | +$98.5K |
|
5498
CALL
Adaptive Biotechnologies
ADPT
$3.65B
| $68K | ﹤0.01% |
10,200
-7,200
| -41% | -$53.5K |
|
5499
CALL
Avery Dennison
AVY
$13B
| $68K | ﹤0.01% |
400
-100
| -20% | -$17.1K |
|
|
KEEL
5500
PUT
Keel Infrastructure Corp
KEEL
$2.44B
| $68K | ﹤0.01% |
46,400
-11,400
| -20% | -$13.2K |
|
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.