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 | Miscellaneous | 98.51% |
| 2 | Technology | 0.42% |
| 3 | Consumer Discretionary | 0.2% |
| 4 | Healthcare | 0.17% |
| 5 | Industrials | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
301
CALL
Twilio
TWLO
$35.8B
| $46M | 0.04% |
690,400
+61,500
| +10% | +$3.79M |
|
302
PUT
MetLife
MET
$62B
| $46M | 0.04% |
793,100
+350,000
| +79% | +$23.6M |
|
303
CALL
Trade Desk
TTD
$6.78B
| $45.9M | 0.04% |
753,900
-217,600
| -22% | -$11.6M |
|
304
CALL
United States Oil Fund
USO
$1.61B
| $45.5M | 0.04% |
684,500
+230,800
| +51% | +$15.4M |
|
305
CALL
Analog Devices
ADI
$176B
| $45.4M | 0.04% |
230,100
+51,300
| +29% | +$9.2M |
|
|
306
Walmart Inc
WMT
$850B
| $45.2M | 0.04% |
+918,957
| New | +$43.6M |
|
307
CALL
EOG Resources
EOG
$76.2B
| $45.1M | 0.04% |
393,800
+111,900
| +40% | +$13.6M |
|
308
PUT
Sea Limited
SE
$68.7B
| $45M | 0.04% |
520,500
+20,900
| +4% | +$1.43M |
|
309
CALL
Regeneron Pharmaceuticals
REGN
$85.2B
| $44.9M | 0.04% |
54,700
-2,200
| -4% | -$1.66M |
|
310
PUT
Align Technology
ALGN
$11.3B
| $44.9M | 0.04% |
134,500
+40,800
| +44% | +$12M |
|
311
CALL
Datadog
DDOG
$76.5B
| $44.8M | 0.04% |
617,200
+188,700
| +44% | +$13.9M |
|
312
PUT
Diamondback Energy
FANG
$55.8B
| $44.7M | 0.04% |
331,000
+5,700
| +2% | +$794K |
|
313
CALL
Marvell Technology
MRVL
$201B
| $44.7M | 0.04% |
1,033,200
-77,800
| -7% | -$3.28M |
|
314
CALL
GE Aerospace
GE
$350B
| $44.7M | 0.04% |
735,386
-383,524
| -34% | -$25.7M |
|
315
CALL
Gilead Sciences
GILD
$187B
| $44.6M | 0.04% |
537,400
-37,300
| -6% | -$3.09M |
|
316
CALL
Danaher
DHR
$146B
| $44.3M | 0.04% |
198,077
-25,944
| -12% | -$5.9M |
|
317
PUT
Thermo Fisher Scientific
TMO
$227B
| $44M | 0.04% |
76,400
+21,100
| +38% | +$11.9M |
|
|
WBA
318
CALL
DELISTED
Walgreens Boots Alliance
WBA
| $43.3M | 0.04% |
1,252,900
+361,000
| +40% | +$12.8M |
|
319
CALL
Abbott
ABT
$187B
| $43M | 0.04% |
424,500
-95,000
| -18% | -$10M |
|
320
PUT
Capital One
COF
$135B
| $42.5M | 0.04% |
441,800
+139,100
| +46% | +$14.6M |
|
321
CALL
RH
RH
$2.8B
| $42.2M | 0.04% |
173,200
+73,200
| +73% | +$21.3M |
|
322
PUT
AT&T
T
$176B
| $42M | 0.04% |
2,513,300
-2,332,400
| -48% | -$44.6M |
|
323
PUT
Ford
F
$58.3B
| $41.9M | 0.04% |
3,322,100
-5,134,700
| -61% | -$64.3M |
|
324
PUT
D.R. Horton
DHI
$39.9B
| $41.8M | 0.04% |
427,600
-45,500
| -10% | -$4.34M |
|
325
CALL
Marriott International
MAR
$87.8B
| $41.8M | 0.04% |
251,500
+122,500
| +95% | +$20.4M |
|
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's Q1 2023 filing shows 1,536 new, 3,663 increased, 3,631 reduced and 1,728 closed positions. Its largest new stake was Walmart Inc: 918,957 shares worth $45.2M. The largest sale was Amazon, an estimated $189M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- 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 1,728 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.