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 | |
|---|---|---|---|---|---|---|
|
DESP
4976
DELISTED
Despegar.com
DESP
| $127K | ﹤0.01% |
10,316
-20,008
| -66% | -$241K |
|
4977
EPR Properties
EPR
$4.9B
| $127K | ﹤0.01% |
2,610
-10,637
| -80% | -$486K |
|
4978
Huntington Ingalls Industries
HII
$12.6B
| $127K | ﹤0.01% |
483
-2,547
| -84% | -$674K |
|
4979
CALL
Hawkins
HWKN
$2.7B
| $127K | ﹤0.01% |
+1,000
| New | +$113K |
|
|
MAG
4980
PUT
DELISTED
MAG Silver
MAG
| $127K | ﹤0.01% |
9,100
+500
| +6% | +$6.59K |
|
4981
PUT
MiMedx Group
MDXG
$636M
| $127K | ﹤0.01% |
21,500
-7,500
| -26% | -$49.7K |
|
4982
CALL
Tetra Tech
TTEK
$8.42B
| $127K | ﹤0.01% |
2,700
-30,800
| -92% | -$1.37M |
|
4983
Direxion Daily Utilities Bull 3X ETF
UTSL
$40.9M
| $127K | ﹤0.01% |
3,190
+101
| +3% | +$3.17K |
|
|
LSXMA
4984
PUT
DELISTED
Liberty Media Corporation Series A Liberty SiriusXM Common Stock
LSXMA
| $127K | ﹤0.01% |
1,700
-251,200
| -99% | -$5.67M |
|
4985
CALL
Alta Equipment Group
ALTG
$197M
| $126K | ﹤0.01% |
18,800
+2,800
| +18% | +$21.5K |
|
4986
CALL
Apogee Enterprises
APOG
$832M
| $126K | ﹤0.01% |
1,800
-900
| -33% | -$57.9K |
|
|
CRESY
4987
PUT
Cresud
CRESY
$823M
| $126K | ﹤0.01% |
14,724
-4,638
| -24% | -$37.5K |
|
|
CWAN
4988
PUT
DELISTED
Clearwater Analytics
CWAN
| $126K | ﹤0.01% |
5,000
+4,400
| +733% | +$99K |
|
|
EFC
4989
PUT
Ellington Financial
EFC
$1.69B
| $126K | ﹤0.01% |
9,800
+4,100
| +72% | +$52.9K |
|
4990
National Beverage
FIZZ
$3B
| $126K | ﹤0.01% |
2,695
+1,076
| +66% | +$51.1K |
|
4991
CALL
Granite Construction
GVA
$5.03B
| $126K | ﹤0.01% |
1,600
| – | – |
|
4992
PUT
Kamada
KMDA
$410M
| $126K | ﹤0.01% |
23,500
-23,300
| -50% | -$129K |
|
4993
CALL
ONE Gas
OGS
$4.9B
| $126K | ﹤0.01% |
1,700
+900
| +113% | +$61.9K |
|
4994
CALL
Protagonist Therapeutics
PTGX
$8.92B
| $126K | ﹤0.01% |
2,800
-800
| -22% | -$32.3K |
|
4995
CALL
Ring Energy
REI
$315M
| $126K | ﹤0.01% |
79,300
-135,700
| -63% | -$243K |
|
4996
ProShares Short Russell2000
RWM
$132M
| $126K | ﹤0.01% |
6,707
-2,795
| -29% | -$55.3K |
|
4997
CALL
TPG
TPG
$6.85B
| $126K | ﹤0.01% |
2,200
-20,000
| -90% | -$985K |
|
4998
ProShares UltraPro Short 20+ Year Treasury
TTT
$19M
| $126K | ﹤0.01% |
2,106
+1,349
| +178% | +$86.1K |
|
|
RVNC
4999
DELISTED
Revance Therapeutics, Inc.
RVNC
| $126K | ﹤0.01% |
24,378
-33,744
| -58% | -$168K |
|
5000
CALL
Sphere 3D
ANY
$18M
| $125K | ﹤0.01% |
13,840
-8,470
| -38% | -$80.7K |
|
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.