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 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$272M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$99M |
| 3 |
NVIDIA
NVDA
|
+$89.9M |
| 4 |
TSMC
TSM
|
+$87.7M |
| 5 |
Amazon
AMZN
|
+$61M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$518M |
| 2 |
Strategy Inc
MSTR
|
+$81.2M |
| 3 |
Alibaba
BABA
|
+$66.7M |
| 4 |
Advanced Micro Devices
AMD
|
+$44.3M |
| 5 |
Uber
UBER
|
+$41.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Consumer Discretionary | 0.22% |
| 3 | Healthcare | 0.17% |
| 4 | Communication Services | 0.15% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2101
CALL
Icahn Enterprises
IEP
$5.17B
| $1.85M | ﹤0.01% |
204,000
-176,000
| -46% | -$1.69M |
|
2102
CALL
Pitney Bowes
PBI
$2.42B
| $1.85M | ﹤0.01% |
204,300
-372,900
| -65% | -$3.38M |
|
2103
CALL
Cooper Companies
COO
$13.7B
| $1.85M | ﹤0.01% |
21,900
+8,100
| +59% | +$726K |
|
|
GTLS
2104
PUT
DELISTED
Chart Industries
GTLS
| $1.85M | ﹤0.01% |
12,800
+2,200
| +21% | +$405K |
|
2105
PUT
Applied Optoelectronics
AAOI
$8.04B
| $1.84M | ﹤0.01% |
120,200
-61,800
| -34% | -$1.55M |
|
2106
Entergy
ETR
$54.1B
| $1.84M | ﹤0.01% |
21,568
+16,746
| +347% | +$1.38M |
|
2107
PUT
Rayonier Advanced Materials
RYAM
$565M
| $1.84M | ﹤0.01% |
+320,600
| New | +$2.25M |
|
2108
PUT
Yext
YEXT
$501M
| $1.84M | ﹤0.01% |
+299,200
| New | +$1.93M |
|
2109
HDFC Bank
HDB
$119B
| $1.84M | ﹤0.01% |
+55,364
| New | +$1.69M |
|
2110
PUT
Sibanye-Stillwater
SBSW
$5.92B
| $1.84M | ﹤0.01% |
401,700
+111,700
| +39% | +$424K |
|
2111
CALL
OneMain Financial
OMF
$6.9B
| $1.84M | ﹤0.01% |
37,600
-15,600
| -29% | -$827K |
|
2112
Rubrik
RBRK
$15.1B
| $1.84M | ﹤0.01% |
30,131
-4,510
| -13% | -$308K |
|
2113
PUT
Concentrix
CNXC
$1.36B
| $1.84M | ﹤0.01% |
33,000
+26,700
| +424% | +$1.28M |
|
2114
CALL
Goodyear
GT
$2.07B
| $1.83M | ﹤0.01% |
198,700
-14,600
| -7% | -$133K |
|
2115
PUT
Rapid7
RPD
$634M
| $1.83M | ﹤0.01% |
69,200
+47,800
| +223% | +$1.63M |
|
2116
PUT
IES Holdings
IESC
$12.5B
| $1.83M | ﹤0.01% |
11,100
+1,500
| +16% | +$313K |
|
2117
CALL
Anavex Life Sciences
AVXL
$222M
| $1.83M | ﹤0.01% |
213,400
+49,100
| +30% | +$464K |
|
2118
PUT
AutoNation
AN
$6.97B
| $1.83M | ﹤0.01% |
11,300
-5,800
| -34% | -$1.03M |
|
2119
Blackrock
BLK
$164B
| $1.83M | ﹤0.01% |
+1,931
| New | +$1.89M |
|
2120
CALL
McCormick & Company Non-Voting
MKC
$13.4B
| $1.83M | ﹤0.01% |
22,200
-15,800
| -42% | -$1.24M |
|
2121
PUT
Consolidated Edison
ED
$41.6B
| $1.82M | ﹤0.01% |
16,500
-26,000
| -61% | -$2.55M |
|
|
QXO
2122
QXO Inc
QXO
$14.2B
| $1.82M | ﹤0.01% |
134,585
+52,875
| +65% | +$719K |
|
|
CIVI
2123
CALL
DELISTED
Civitas Resources
CIVI
| $1.82M | ﹤0.01% |
52,100
+23,400
| +82% | +$1.04M |
|
2124
CALL
Centrus Energy
LEU
$3.22B
| $1.82M | ﹤0.01% |
29,200
-120,700
| -81% | -$10.2M |
|
2125
CALL
Lantheus
LNTH
$6.82B
| $1.81M | ﹤0.01% |
18,600
-1,600
| -8% | -$150K |
|
Similar funds
Simplex Trading's Q1 2025 Portfolio in Review
As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading withdrew a net $7.93B in Q1 2025, closing 1,547 positions and reducing 3,654 holdings. Its most notable exit was Alibaba, an estimated $66.7M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.68% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in iShares 20+ Year Treasury Bond ETF worth $278M.
- Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
- Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
- Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
- Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
- Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
- Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
- Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.