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 | |
|---|---|---|---|---|---|---|
2401
CALL
The GEO Group
GEO
$4.13B
| $1.23M | ﹤0.01% |
172,300
+136,600
| +383% | +$1.06M |
|
2402
Ericsson
ERIC
$30.7B
| $1.23M | ﹤0.01% |
225,952
+36,108
| +19% | +$194K |
|
|
NKLA
2403
PUT
DELISTED
Nikola Corporation Common Stock
NKLA
| $1.23M | ﹤0.01% |
29,757
+12,237
| +70% | +$337K |
|
2404
CALL
GDS Holdings
GDS
$6.34B
| $1.23M | ﹤0.01% |
112,000
+84,200
| +303% | +$1.12M |
|
2405
PUT
Watts Water Technologies
WTS
$11.5B
| $1.23M | ﹤0.01% |
+6,700
| New | +$1.12M |
|
2406
PUT
Biomea Fusion
BMEA
$90.4M
| $1.23M | ﹤0.01% |
56,000
+37,500
| +203% | +$1.17M |
|
2407
PUT
Lattice Semiconductor
LSCC
$17.6B
| $1.23M | ﹤0.01% |
12,800
-8,000
| -38% | -$688K |
|
2408
CALL
Anavex Life Sciences
AVXL
$222M
| $1.23M | ﹤0.01% |
151,100
+34,500
| +30% | +$296K |
|
2409
PUT
MarketAxess Holdings
MKTX
$4.15B
| $1.23M | ﹤0.01% |
4,700
-1,100
| -19% | -$328K |
|
2410
CALL
Primerica
PRI
$9.81B
| $1.23M | ﹤0.01% |
6,200
| – | – |
|
2411
PUT
Acuity Brands
AYI
$9.88B
| $1.22M | ﹤0.01% |
7,500
-700
| -9% | -$112K |
|
2412
Global X Uranium ETF
URA
$5.52B
| $1.22M | ﹤0.01% |
56,341
-22,789
| -29% | -$466K |
|
2413
PUT
Corteva
CTVA
$59.7B
| $1.22M | ﹤0.01% |
21,300
+8,400
| +65% | +$490K |
|
2414
CALL
Bumble
BMBL
$367M
| $1.22M | ﹤0.01% |
72,700
-95,400
| -57% | -$1.65M |
|
2415
CALL
Charles River Laboratories
CRL
$10.9B
| $1.22M | ﹤0.01% |
5,800
-10,000
| -63% | -$1.99M |
|
|
DVAX
2416
CALL
DELISTED
Dynavax Technologies
DVAX
| $1.22M | ﹤0.01% |
94,200
-2,500
| -3% | -$28.5K |
|
2417
CALL
Runway Growth Finance
RWAY
$228M
| $1.22M | ﹤0.01% |
98,500
+8,100
| +9% | +$94.3K |
|
2418
Zimmer Biomet
ZBH
$17.7B
| $1.22M | ﹤0.01% |
8,351
-1,860
| -18% | -$253K |
|
|
DQ
2419
Daqo New Energy
DQ
$790M
| $1.21M | ﹤0.01% |
30,598
-14,274
| -32% | -$595K |
|
2420
CALL
Silicon Laboratories
SLAB
$7.15B
| $1.21M | ﹤0.01% |
7,700
+7,500
| +3,750% | +$1.13M |
|
2421
PUT
Deckers Outdoor
DECK
$13.3B
| $1.21M | ﹤0.01% |
13,800
-15,000
| -52% | -$1.21M |
|
2422
PUT
Rocket Companies
RKT
$36.9B
| $1.21M | ﹤0.01% |
135,300
-45,300
| -25% | -$394K |
|
2423
PUT
Insulet
PODD
$11.3B
| $1.21M | ﹤0.01% |
4,200
+800
| +24% | +$243K |
|
|
EGLE
2424
PUT
DELISTED
Eagle Bulk Shipping Inc.
EGLE
| $1.21M | ﹤0.01% |
25,200
+18,000
| +250% | +$795K |
|
2425
CALL
RLJ Lodging Trust
RLJ
$1.87B
| $1.21M | ﹤0.01% |
117,700
| – | – |
|
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.