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 | |
|---|---|---|---|---|---|---|
1001
Steel Dynamics
STLD
$34.7B
| $10.6M | 0.01% |
84,163
+56,258
| +202% | +$6.84M |
|
1002
Union Pacific
UNP
$181B
| $10.6M | 0.01% |
43,010
+31,781
| +283% | +$7.71M |
|
1003
Upstart Holdings
UPST
$2.64B
| $10.6M | 0.01% |
264,883
+211,154
| +393% | +$7.02M |
|
|
SMAR
1004
CALL
DELISTED
Smartsheet Inc.
SMAR
| $10.6M | 0.01% |
191,300
+128,600
| +205% | +$6.23M |
|
1005
Micron Technology
MU
$1.12T
| $10.6M | 0.01% |
102,047
+46,385
| +83% | +$4.85M |
|
1006
PUT
HSBC
HSBC
$349B
| $10.5M | 0.01% |
233,000
+133,800
| +135% | +$5.8M |
|
1007
CALL
First Citizens BancShares
FCNCA
$25.2B
| $10.5M | 0.01% |
5,700
-6,300
| -53% | -$12M |
|
1008
PUT
Macy's
M
$6.14B
| $10.5M | 0.01% |
668,000
+90,900
| +16% | +$1.48M |
|
1009
CALL
Alnylam Pharmaceuticals
ALNY
$35.9B
| $10.4M | 0.01% |
37,900
-50,500
| -57% | -$13.1M |
|
|
RDFN
1010
CALL
DELISTED
Redfin
RDFN
| $10.4M | 0.01% |
831,300
+357,200
| +75% | +$3.28M |
|
1011
CALL
SolarEdge
SEDG
$2.75B
| $10.4M | 0.01% |
454,200
-123,600
| -21% | -$3.01M |
|
1012
Marathon Digital Holdings
MARA
$4.87B
| $10.4M | 0.01% |
641,165
-723,251
| -53% | -$13.1M |
|
1013
CALL
Zions Bancorporation
ZION
$10.1B
| $10.4M | 0.01% |
219,700
-46,900
| -18% | -$2.22M |
|
1014
CALL
Digital Realty Trust
DLR
$66.4B
| $10.4M | 0.01% |
64,100
-13,300
| -17% | -$2.04M |
|
1015
Eaton
ETN
$161B
| $10.4M | 0.01% |
+31,262
| New | +$9.55M |
|
1016
CALL
Biogen
BIIB
$29.6B
| $10.3M | 0.01% |
53,200
-4,300
| -7% | -$900K |
|
|
1017
Biogen
BIIB
$29.6B
| $10.3M | 0.01% |
53,118
+32,405
| +156% | +$6.78M |
|
1018
PUT
Nutrien
NTR
$32.9B
| $10.3M | 0.01% |
214,200
+7,900
| +4% | +$381K |
|
1019
PUT
Align Technology
ALGN
$12B
| $10.2M | 0.01% |
40,200
-44,000
| -52% | -$10.4M |
|
1020
CALL
Applied Digital
APLD
$8.54B
| $10.2M | 0.01% |
1,237,600
+1,024,400
| +480% | +$5.43M |
|
1021
CALL
UL Solutions
ULS
$17.5B
| $10.2M | 0.01% |
207,100
+206,700
| +51,675% | +$10.1M |
|
1022
Newmont
NEM
$101B
| $10.2M | 0.01% |
190,777
-633,374
| -77% | -$31.5M |
|
1023
PUT
Vertex Pharmaceuticals
VRTX
$120B
| $10.2M | 0.01% |
21,900
-22,400
| -51% | -$10.8M |
|
1024
CALL
Emcor
EME
$34.2B
| $10.2M | 0.01% |
23,600
+3,000
| +15% | +$1.13M |
|
1025
CALL
Synchrony
SYF
$23.3B
| $10.1M | 0.01% |
203,400
-322,900
| -61% | -$15.6M |
|
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.