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 | |
|---|---|---|---|---|---|---|
5001
CALL
Vertex
VERX
$2.07B
| $105K | ﹤0.01% |
+3,000
| New | +$137K |
|
5002
PUT
Vanguard Total International Stock ETF
VXUS
$155B
| $105K | ﹤0.01% |
1,700
-4,500
| -73% | -$278K |
|
|
AIPI
5003
REX AI Equity Premium Income ETF
AIPI
$405M
| $105K | ﹤0.01% |
+2,634
| New | +$123K |
|
|
AEVA
5004
CALL
Aeva Technologies
AEVA
$1.19B
| $104K | ﹤0.01% |
14,900
+11,200
| +303% | +$46.1K |
|
5005
Altimmune
ALT
$543M
| $104K | ﹤0.01% |
20,821
-160,351
| -89% | -$1.02M |
|
5006
PUT
CarGurus
CARG
$3.23B
| $104K | ﹤0.01% |
3,600
+2,100
| +140% | +$73.6K |
|
5007
CALL
Caribou Biosciences
CRBU
$143M
| $104K | ﹤0.01% |
114,400
-3,600
| -3% | -$4.68K |
|
5008
ProShares UltraShort Euro
EUO
$34.8M
| $104K | ﹤0.01% |
3,240
-4,152
| -56% | -$141K |
|
5009
CALL
Ingles Markets
IMKTA
$1.71B
| $104K | ﹤0.01% |
1,600
-1,100
| -41% | -$70.2K |
|
5010
PUT
MiMedx Group
MDXG
$590M
| $104K | ﹤0.01% |
13,700
+5,700
| +71% | +$47.6K |
|
5011
CALL
LiveRamp
RAMP
$2.3B
| $104K | ﹤0.01% |
4,000
-18,200
| -82% | -$557K |
|
5012
CALL
Viavi Solutions
VIAV
$9.06B
| $104K | ﹤0.01% |
9,300
+1,600
| +21% | +$17.8K |
|
5013
PUT
Zevra Therapeutics
ZVRA
$569M
| $104K | ﹤0.01% |
13,900
-8,900
| -39% | -$70.7K |
|
5014
PUT
Amplitude
AMPL
$1.15B
| $103K | ﹤0.01% |
10,200
+9,400
| +1,175% | +$111K |
|
5015
ARKO Corp
ARKO
$889M
| $103K | ﹤0.01% |
26,143
+14,203
| +119% | +$83K |
|
5016
CALL
Black Hills Corp
BKH
$5.46B
| $103K | ﹤0.01% |
1,700
+1,400
| +467% | +$82.9K |
|
5017
PUT
Credit Acceptance
CACC
$5.94B
| $103K | ﹤0.01% |
+200
| New | +$98.9K |
|
5018
CALL
CAE Inc. Common Shares
CAE
$8.34B
| $103K | ﹤0.01% |
4,200
-8,200
| -66% | -$200K |
|
|
KLG
5019
PUT
DELISTED
WK Kellogg Co
KLG
| $103K | ﹤0.01% |
5,200
-43,300
| -89% | -$789K |
|
5020
CALL
Magnolia Oil & Gas
MGY
$6.01B
| $103K | ﹤0.01% |
+4,100
| New | +$99.4K |
|
5021
CALL
OFS Capital
OFS
$43.3M
| $103K | ﹤0.01% |
11,100
-200
| -2% | -$1.7K |
|
5022
CALL
Payoneer
PAYO
$2.42B
| $103K | ﹤0.01% |
14,100
-13,600
| -49% | -$127K |
|
5023
SM Energy
SM
$7.65B
| $103K | ﹤0.01% |
3,458
-5,075
| -59% | -$182K |
|
5024
PUT
Travere Therapeutics
TVTX
$5.22B
| $103K | ﹤0.01% |
5,800
-35,000
| -86% | -$710K |
|
5025
PUT
United States Antimony
UAMY
$754M
| $103K | ﹤0.01% |
47,000
+15,700
| +50% | +$27.2K |
|
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.