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 | |
|---|---|---|---|---|---|---|
3026
PUT
Sabre
SABR
$716M
| $711K | ﹤0.01% |
253,200
-275,000
| -52% | -$973K |
|
|
TSSI
3027
CALL
TSS Inc
TSSI
$284M
| $711K | ﹤0.01% |
90,700
+78,300
| +631% | +$932K |
|
|
CYBR
3028
PUT
DELISTED
CyberArk
CYBR
| $709K | ﹤0.01% |
2,100
-3,800
| -64% | -$1.37M |
|
3029
CALL
Glaukos
GKOS
$9.05B
| $708K | ﹤0.01% |
7,200
-13,200
| -65% | -$1.76M |
|
3030
CALL
Sturm, Ruger & Co
RGR
$620M
| $707K | ﹤0.01% |
18,000
+6,100
| +51% | +$229K |
|
|
AIV
3031
CALL
Aimco
AIV
$384M
| $704K | ﹤0.01% |
80,100
+56,700
| +242% | +$504K |
|
3032
PUT
Aramark
ARMK
$15.2B
| $704K | ﹤0.01% |
20,400
-1,000
| -5% | -$36.8K |
|
3033
CALL
Zai Lab
ZLAB
$2.17B
| $704K | ﹤0.01% |
19,500
+18,000
| +1,200% | +$554K |
|
3034
CALL
Teucrium Agricultural Fund
TAGS
$19.3M
| $700K | ﹤0.01% |
144,000
-55,300
| -28% | -$1.43M |
|
3035
RUM Group Inc
RUM
$1.65B
| $699K | ﹤0.01% |
98,924
-41,595
| -30% | -$434K |
|
3036
PUT
Brookfield Renewable
BEP
$9.99B
| $698K | ﹤0.01% |
31,500
+11,000
| +54% | +$246K |
|
3037
PUT
HealthEquity
HQY
$8.03B
| $698K | ﹤0.01% |
7,900
+7,800
| +7,800% | +$800K |
|
3038
PUT
Mercury Insurance
MCY
$6B
| $698K | ﹤0.01% |
+12,500
| New | +$674K |
|
3039
PUT
Structure Therapeutics
GPCR
$3.62B
| $697K | ﹤0.01% |
40,300
+11,000
| +38% | +$269K |
|
3040
PUT
Rush Street Interactive
RSI
$3.28B
| $697K | ﹤0.01% |
65,100
+53,600
| +466% | +$705K |
|
3041
PUT
Tyler Technologies
TYL
$12.7B
| $697K | ﹤0.01% |
1,200
+700
| +140% | +$416K |
|
|
ANSS
3042
CALL
DELISTED
Ansys
ANSS
| $696K | ﹤0.01% |
2,200
-1,500
| -41% | -$503K |
|
3043
CALL
Imperial Petroleum
IMPP
$218M
| $696K | ﹤0.01% |
284,200
+136,000
| +92% | +$377K |
|
|
TUYA
3044
Tuya Inc
TUYA
$1.02B
| $696K | ﹤0.01% |
230,025
+224,026
| +3,734% | +$663K |
|
3045
CALL
Weatherford International
WFRD
$6.46B
| $696K | ﹤0.01% |
13,000
+11,200
| +622% | +$710K |
|
3046
iShares 1-3 Year Treasury Bond ETF
SHY
$25.4B
| $695K | ﹤0.01% |
8,405
-2,628
| -24% | -$216K |
|
|
TPC
3047
PUT
Tutor Perini Cor
TPC
$4.54B
| $695K | ﹤0.01% |
30,000
-200
| -0.7% | -$4.93K |
|
3048
PUT
Crescent Energy
CRGY
$3.61B
| $692K | ﹤0.01% |
61,600
-16,300
| -21% | -$225K |
|
|
GTLS
3049
CALL
DELISTED
Chart Industries
GTLS
| $692K | ﹤0.01% |
4,800
-6,000
| -56% | -$1.1M |
|
|
CALY
3050
PUT
Callaway Golf Company
CALY
$3.3B
| $691K | ﹤0.01% |
105,000
+87,700
| +507% | +$644K |
|
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.