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 |
Walmart Inc
WMT
|
+$43.6M |
| 2 |
Apple
AAPL
|
+$40.9M |
| 3 |
VanEck Oil Services ETF
OIH
|
+$37.7M |
| 4 |
Citigroup
C
|
+$34.2M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$32.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$189M |
| 2 |
Invesco QQQ Trust
QQQ
|
+$123M |
| 3 |
NVIDIA
NVDA
|
+$115M |
| 4 |
Tesla
TSLA
|
+$52M |
| 5 |
Meta Platforms (Facebook)
META
|
+$49M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.42% |
| 2 | Consumer Discretionary | 0.2% |
| 3 | Healthcare | 0.17% |
| 4 | Industrials | 0.15% |
| 5 | Communication Services | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
251
CALL
Ulta Beauty
ULTA
$20.7B
| $60.1M | 0.05% |
110,100
+53,800
| +96% | +$27.6M |
|
252
PUT
Lockheed Martin
LMT
$119B
| $60M | 0.05% |
126,900
-80,200
| -39% | -$37.6M |
|
253
PUT
Pinterest
PINS
$12.7B
| $59.2M | 0.05% |
2,169,200
-833,500
| -28% | -$21.6M |
|
254
PUT
Honeywell
HON
$74.2B
| $58.9M | 0.05% |
327,106
+26,949
| +9% | +$5.07M |
|
255
PUT
Las Vegas Sands
LVS
$30.5B
| $58.2M | 0.05% |
1,013,100
-242,800
| -19% | -$13.6M |
|
256
CALL
MongoDB
MDB
$24.2B
| $58.2M | 0.05% |
249,500
-41,300
| -14% | -$8.67M |
|
257
PUT
Linde
LIN
$235B
| $58.1M | 0.05% |
163,400
-65,800
| -29% | -$22M |
|
258
CALL
Roku
ROKU
$21.3B
| $57M | 0.05% |
866,600
-163,900
| -16% | -$9.59M |
|
259
PUT
ConocoPhillips
COP
$146B
| $57M | 0.05% |
574,300
+144,600
| +34% | +$15.8M |
|
|
B
260
CALL
Barrick Mining
B
$63B
| $56.5M | 0.05% |
3,042,900
+779,100
| +34% | +$14M |
|
261
PUT
Proshares UltraShort Technology
REW
$3.31M
| $55.5M | 0.05% |
308,788
-9,200
| -3% | -$1.27M |
|
|
ATVI
262
PUT
DELISTED
Activision Blizzard
ATVI
| $55.5M | 0.05% |
648,400
+360,400
| +125% | +$28M |
|
263
CALL
Marathon Petroleum
MPC
$93.8B
| $55.4M | 0.05% |
411,000
-84,500
| -17% | -$10.6M |
|
264
PUT
Roblox
RBLX
$36.3B
| $55.4M | 0.05% |
1,230,800
-202,400
| -14% | -$7.73M |
|
265
PUT
SolarEdge
SEDG
$2.99B
| $55.2M | 0.05% |
181,600
+54,900
| +43% | +$16.7M |
|
266
CALL
Sea Limited
SE
$64.5B
| $55.2M | 0.05% |
637,600
+118,000
| +23% | +$8.06M |
|
267
CALL
Blackrock
BLK
$161B
| $54.9M | 0.05% |
82,000
+28,900
| +54% | +$20.4M |
|
268
PUT
Zoom
ZM
$25.3B
| $54.2M | 0.05% |
733,600
+33,800
| +5% | +$2.44M |
|
269
PUT
Dollar Tree
DLTR
$23.8B
| $54.1M | 0.05% |
376,800
-168,000
| -31% | -$24.4M |
|
270
PUT
NextEra Energy
NEE
$186B
| $53.9M | 0.05% |
699,800
-209,800
| -23% | -$16.1M |
|
271
CALL
American Airlines Group
AAL
$9.93B
| $53.9M | 0.05% |
3,652,100
-1,950,800
| -35% | -$30.4M |
|
272
PUT
Dick's Sporting Goods
DKS
$18.5B
| $52.5M | 0.05% |
370,100
-67,300
| -15% | -$8.96M |
|
273
CALL
American Express
AXP
$236B
| $52M | 0.05% |
315,100
+50,100
| +19% | +$8.31M |
|
274
PUT
Bristol-Myers Squibb
BMY
$125B
| $51.1M | 0.04% |
737,500
-406,200
| -36% | -$28.6M |
|
|
ATVI
275
CALL
DELISTED
Activision Blizzard
ATVI
| $51.1M | 0.04% |
596,500
+137,500
| +30% | +$10.7M |
|
Similar funds
Simplex Trading's Q1 2023 Portfolio in Review
As of Q1 2023, Simplex Trading held 10,803 positions worth $114B, up 24% from $91.9B the previous quarter. Its ten largest holdings account for 38% of the portfolio.
Simplex Trading deployed $10.1B of net new capital in Q1 2023, opening 1,536 new positions and adding to 3,665 existing holdings. Its largest new stake was Walmart Inc: 918,957 shares worth $45.2M.
By sector, the portfolio is most concentrated in Technology at 0.42% of assets, up from 0.35% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Meta Platforms (Facebook), an estimated $49M trimmed.
- Simplex Trading's largest Q1 2023 buy was Walmart Inc: 918,957 shares worth $45.2M.
- Simplex Trading added most to Apple in Q1 2023, an estimated $40.9M increase.
- Simplex Trading's biggest Q1 2023 reduction was Meta Platforms (Facebook), cutting an estimated $49M.
- Simplex Trading fully exited Amazon in Q1 2023, selling an estimated $189M.
- Simplex Trading's ten largest holdings make up 38% of its $114B portfolio in Q1 2023.
- Simplex Trading opened 1,536 new positions and closed 1,729 in Q1 2023.
- Simplex Trading's portfolio value rose 24% quarter-over-quarter to $114B.
Based on Simplex Trading's 13F filing for Q1 2023, filed 27 Apr 2023.