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 | |
|---|---|---|---|---|---|---|
451
Advanced Micro Devices
AMD
$901B
| $27.2M | 0.02% |
238,915
+134,922
| +130% | +$14M |
|
452
PUT
Abbott
ABT
$175B
| $27.2M | 0.02% |
249,200
+56,500
| +29% | +$6.02M |
|
453
CALL
Etsy
ETSY
$7.64B
| $27.1M | 0.02% |
320,600
+91,900
| +40% | +$8.66M |
|
454
PUT
CF Industries
CF
$19.6B
| $27.1M | 0.02% |
389,900
-24,400
| -6% | -$1.7M |
|
455
CALL
GameStop
GME
$9.69B
| $26.9M | 0.02% |
1,110,100
-464,500
| -29% | -$10.4M |
|
456
PUT
Cadence Design Systems
CDNS
$93B
| $26.9M | 0.02% |
114,600
+84,900
| +286% | +$18.5M |
|
457
CALL
CarMax
KMX
$8.15B
| $26.9M | 0.02% |
320,800
-117,500
| -27% | -$8.6M |
|
458
CALL
MetLife
MET
$60B
| $26.8M | 0.02% |
474,900
-373,800
| -44% | -$20.7M |
|
459
CALL
The Mosaic Company
MOS
$7.24B
| $26.8M | 0.02% |
775,900
+176,800
| +30% | +$6.83M |
|
460
PUT
NIO
NIO
$11.7B
| $26.8M | 0.02% |
2,764,500
+591,800
| +27% | +$5.01M |
|
461
PUT
Blackrock
BLK
$164B
| $26.6M | 0.02% |
38,500
-58,800
| -60% | -$39.4M |
|
462
PUT
Domino's
DPZ
$10.6B
| $26.6M | 0.02% |
78,900
-62,900
| -44% | -$19.8M |
|
463
PUT
Thermo Fisher Scientific
TMO
$196B
| $26.6M | 0.02% |
50,900
-25,500
| -33% | -$13.8M |
|
464
PUT
Rio Tinto
RIO
$150B
| $26.5M | 0.02% |
414,600
-271,200
| -40% | -$17.4M |
|
465
PUT
DexCom
DXCM
$27.6B
| $26.4M | 0.02% |
205,600
-72,900
| -26% | -$8.82M |
|
466
CALL
Warner Bros
WBD
$64.8B
| $26.4M | 0.02% |
2,105,900
+401,900
| +24% | +$5.22M |
|
467
CALL
Humana
HUM
$47.7B
| $26.4M | 0.02% |
59,000
-14,800
| -20% | -$7.45M |
|
468
PUT
Medtronic
MDT
$105B
| $26.3M | 0.02% |
298,700
-18,400
| -6% | -$1.58M |
|
469
PUT
Vertex Pharmaceuticals
VRTX
$120B
| $26.3M | 0.02% |
74,600
+12,500
| +20% | +$4.21M |
|
470
PUT
Marathon Petroleum
MPC
$92.2B
| $26.2M | 0.02% |
224,800
-268,100
| -54% | -$31.2M |
|
471
PUT
Southwest Airlines
LUV
$23.3B
| $26.2M | 0.02% |
723,200
-57,200
| -7% | -$1.79M |
|
472
CALL
Cameco
CCJ
$39.4B
| $26.1M | 0.02% |
832,500
-386,200
| -32% | -$10.9M |
|
473
PUT
Marathon Digital Holdings
MARA
$4.73B
| $26M | 0.02% |
1,879,000
-192,400
| -9% | -$1.94M |
|
|
WBA
474
CALL
DELISTED
Walgreens Boots Alliance
WBA
| $26M | 0.02% |
913,600
-339,300
| -27% | -$11.1M |
|
475
CALL
Digital Realty Trust
DLR
$66B
| $25.9M | 0.02% |
227,700
+154,000
| +209% | +$15.2M |
|
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.