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 | |
|---|---|---|---|---|---|---|
|
NSLR
5226
Neostellar Capital Corp
NSLR
$269M
| $101K | ﹤0.01% |
25,108
+18,610
| +286% | +$72.9K |
|
|
ATSG
5227
CALL
DELISTED
Air Transport Services Group
ATSG
| $101K | ﹤0.01% |
6,300
-11,000
| -64% | -$168K |
|
5228
PUT
Alpha Pro Tech
APT
$50.4M
| $100K | ﹤0.01% |
17,700
+4,400
| +33% | +$25.4K |
|
|
DAWN
5229
DELISTED
Day One Biopharmaceuticals
DAWN
| $100K | ﹤0.01% |
7,240
-10,185
| -58% | -$145K |
|
|
JAMF
5230
CALL
DELISTED
Jamf
JAMF
| $100K | ﹤0.01% |
5,800
-14,700
| -72% | -$261K |
|
|
LX
5231
PUT
LexinFintech Holdings
LX
$241M
| $100K | ﹤0.01% |
36,800
+31,800
| +636% | +$55.5K |
|
5232
Odyssey Marine Exploration
OMEX
$34.9M
| $100K | ﹤0.01% |
+121,487
| New | +$456K |
|
|
AHRT
5233
PUT
AH Realty Trust
AHRT
$529M
| $99K | ﹤0.01% |
9,200
+100
| +1% | +$1.17K |
|
5234
CALL
AMC Global Media
AMCX
$492M
| $99K | ﹤0.01% |
11,400
+3,800
| +50% | +$36.7K |
|
5235
Aterian
ATER
$4.45M
| $99K | ﹤0.01% |
34,510
+13,979
| +68% | +$41.8K |
|
5236
CNX Resources
CNX
$5.06B
| $99K | ﹤0.01% |
+3,049
| New | +$82.1K |
|
5237
PUT
Editas Medicine
EDIT
$396M
| $99K | ﹤0.01% |
29,100
-33,500
| -54% | -$146K |
|
5238
CALL
Vertical Aerospace
EVTL
$158M
| $99K | ﹤0.01% |
14,300
+12,860
| +893% | +$106K |
|
5239
PUT
Globant
GLOB
$1.58B
| $99K | ﹤0.01% |
500
-600
| -55% | -$116K |
|
5240
CALL
Janux Therapeutics
JANX
$925M
| $99K | ﹤0.01% |
2,200
-14,700
| -87% | -$640K |
|
5241
CALL
Outdoor Holding Co
POWW
$249M
| $99K | ﹤0.01% |
69,900
+3,400
| +5% | +$5.39K |
|
5242
Prothena Corp
PRTA
$425M
| $99K | ﹤0.01% |
5,977
+3,710
| +164% | +$79.8K |
|
|
SCPH
5243
PUT
DELISTED
scPharmaceuticals
SCPH
| $99K | ﹤0.01% |
21,900
+18,400
| +526% | +$89K |
|
|
SGMO
5244
DELISTED
SANGAMO THERAPEUTICS INC
SGMO
| $99K | ﹤0.01% |
114,736
+70,832
| +161% | +$51.9K |
|
5245
SmartRent
SMRT
$195M
| $99K | ﹤0.01% |
57,558
+55,428
| +2,602% | +$105K |
|
5246
PUT
Aldeyra Therapeutics
ALDX
$92.9M
| $98K | ﹤0.01% |
18,200
+7,400
| +69% | +$35.2K |
|
5247
PUT
Dycom Industries
DY
$12B
| $98K | ﹤0.01% |
500
-8,300
| -94% | -$1.5M |
|
5248
PUT
First Trust Water ETF
FIW
$1.85B
| $98K | ﹤0.01% |
+900
| New | +$94.1K |
|
5249
CALL
Gold Royalty Corp
GROY
$600M
| $98K | ﹤0.01% |
72,500
-300
| -0.4% | -$407 |
|
5250
CALL
FerroAtlántica
GSM
$594M
| $98K | ﹤0.01% |
21,200
+2,400
| +13% | +$11.6K |
|
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.