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 |
Boeing
BA
|
+$55.8M |
| 2 |
Microsoft
MSFT
|
+$42.2M |
| 3 |
Pinduoduo
PDD
|
+$41.3M |
| 4 |
Apple
AAPL
|
+$32M |
| 5 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$28.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Broadcom
AVGO
|
+$95.2M |
| 2 |
Citigroup
C
|
+$57.2M |
| 3 |
Pfizer
PFE
|
+$56.4M |
| 4 |
TSMC
TSM
|
+$39.7M |
| 5 |
Starbucks
SBUX
|
+$35.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.4% |
| 2 | Consumer Discretionary | 0.29% |
| 3 | Healthcare | 0.15% |
| 4 | Industrials | 0.13% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
251
CALL
Intuitive Surgical
ISRG
$121B
| $63.7M | 0.04% |
129,600
+27,400
| +27% | +$12.8M |
|
252
CALL
MongoDB
MDB
$24.5B
| $63.6M | 0.04% |
235,200
+86,500
| +58% | +$22.5M |
|
253
PUT
General Motors
GM
$74.1B
| $63.4M | 0.04% |
1,414,600
-395,000
| -22% | -$18.3M |
|
254
PUT
Datadog
DDOG
$87.5B
| $63.4M | 0.04% |
550,700
+44,400
| +9% | +$5.19M |
|
255
CALL
Wynn Resorts
WYNN
$9.79B
| $63.3M | 0.04% |
660,400
+326,000
| +97% | +$26.2M |
|
256
PUT
SiriusXM
SIRI
$10B
| $63.3M | 0.04% |
2,676,300
+2,575,860
| +2,565% | +$80M |
|
257
PUT
Linde
LIN
$235B
| $63.3M | 0.04% |
132,700
-21,800
| -14% | -$9.95M |
|
258
CALL
Western Digital
WDC
$192B
| $62.9M | 0.04% |
1,219,541
-153,468
| -11% | -$7.75M |
|
259
PUT
United Airlines
UAL
$38.1B
| $62.5M | 0.04% |
1,094,500
-680,000
| -38% | -$31.5M |
|
260
PUT
Blackrock
BLK
$164B
| $62.4M | 0.04% |
65,700
+7,700
| +13% | +$6.66M |
|
|
261
CALL
General Motors
GM
$74.1B
| $62.1M | 0.04% |
1,385,800
-1,076,100
| -44% | -$49.9M |
|
262
CALL
Apollo Global Management
APO
$68.6B
| $62.1M | 0.04% |
497,100
+175,500
| +55% | +$20.3M |
|
263
CALL
Roblox
RBLX
$35.5B
| $62.1M | 0.04% |
1,402,200
-606,300
| -30% | -$25.3M |
|
264
CALL
Applovin
APP
$139B
| $61.9M | 0.04% |
474,400
+62,300
| +15% | +$5.68M |
|
265
PUT
Union Pacific
UNP
$174B
| $61.7M | 0.04% |
250,300
+111,000
| +80% | +$26.9M |
|
266
PUT
ARK Space & Defense Innovation ETF
ARKX
$817M
| $61.5M | 0.04% |
1,447,800
-47,000
| -3% | -$711K |
|
267
PUT
T-Mobile US
TMUS
$207B
| $61.4M | 0.04% |
297,400
-158,400
| -35% | -$30.3M |
|
268
PUT
Texas Instruments
TXN
$268B
| $61.2M | 0.04% |
296,400
-109,800
| -27% | -$22.1M |
|
269
CALL
Marvell Technology
MRVL
$189B
| $60.8M | 0.04% |
842,700
-749,500
| -47% | -$51.8M |
|
|
NVO
270
CALL
Novo Nordisk
NVO
$213B
| $60.5M | 0.04% |
507,900
-224,800
| -31% | -$30M |
|
271
PUT
Airbnb
ABNB
$83.1B
| $60.4M | 0.04% |
476,500
-228,800
| -32% | -$29.7M |
|
|
XYZ
272
PUT
Block Inc
XYZ
$46.1B
| $60.2M | 0.04% |
896,900
-189,100
| -17% | -$12.2M |
|
273
CALL
Robinhood
HOOD
$93.8B
| $59.9M | 0.04% |
2,556,200
+12,300
| +0.5% | +$259K |
|
274
PUT
Estee Lauder
EL
$29.9B
| $59.4M | 0.03% |
595,500
+147,000
| +33% | +$13.9M |
|
|
275
PUT
MongoDB
MDB
$24.5B
| $59.1M | 0.03% |
218,500
+64,700
| +42% | +$16.8M |
|
Similar funds
Simplex Trading's Q3 2024 Portfolio in Review
As of Q3 2024, Simplex Trading held 9,964 positions worth $170B, up 5.3% from $162B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q3 2024 filing shows 1,185 new, 3,232 increased, 3,829 reduced and 1,476 closed positions. Its largest new stake was Boeing: 325,328 shares worth $49.5M. The largest sale was Broadcom, an estimated $95.2M.
By sector, the portfolio is most concentrated in Technology at 0.4% of assets, down from 0.53% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2024 buy was Boeing: 325,328 shares worth $49.5M.
- Simplex Trading added most to Pinduoduo in Q3 2024, an estimated $41.3M increase.
- Simplex Trading's biggest Q3 2024 reduction was Citigroup, cutting an estimated $57.2M.
- Simplex Trading fully exited Broadcom in Q3 2024, selling an estimated $95.2M.
- Simplex Trading's ten largest holdings make up 50% of its $170B portfolio in Q3 2024.
- Simplex Trading opened 1,185 new positions and closed 1,476 in Q3 2024.
- Simplex Trading's portfolio value rose 5.3% quarter-over-quarter to $170B.
Based on Simplex Trading's 13F filing for Q3 2024, filed 8 Nov 2024.