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 | |
|---|---|---|---|---|---|---|
5026
PUT
United Microelectronic
UMC
$48.2B
| $103K | ﹤0.01% |
14,500
+5,700
| +65% | +$36.3K |
|
5027
PUT
C.H. Robinson
CHRW
$17.6B
| $102K | ﹤0.01% |
1,000
-28,300
| -97% | -$2.86M |
|
|
ETNB
5028
PUT
DELISTED
89bio
ETNB
| $102K | ﹤0.01% |
14,100
+2,200
| +18% | +$19.2K |
|
5029
FTAI Aviation
FTAI
$21B
| $102K | ﹤0.01% |
923
-6,476
| -88% | -$765K |
|
5030
CALL
Fortive
FTV
$17.8B
| $102K | ﹤0.01% |
1,858
-13,403
| -88% | -$787K |
|
5031
CALL
Inspired Entertainment
INSE
$180M
| $102K | ﹤0.01% |
12,000
-63,200
| -84% | -$608K |
|
5032
PUT
Interparfums
IPAR
$3.99B
| $102K | ﹤0.01% |
900
-2,800
| -76% | -$372K |
|
5033
NIO
NIO
$12.1B
| $102K | ﹤0.01% |
26,830
-1,215,117
| -98% | -$5.35M |
|
5034
PUT
Rocket Pharmaceuticals
RCKT
$336M
| $102K | ﹤0.01% |
15,300
-300
| -2% | -$2.96K |
|
5035
Sprott Gold Miners ETF
SGDM
$547M
| $102K | ﹤0.01% |
+2,692
| New | +$88.6K |
|
5036
PUT
Vicor
VICR
$9.73B
| $102K | ﹤0.01% |
2,200
+2,000
| +1,000% | +$106K |
|
5037
CALL
Artisan Partners
APAM
$2.8B
| $101K | ﹤0.01% |
2,600
-200
| -7% | -$8.47K |
|
5038
Arhaus
ARHS
$1.04B
| $101K | ﹤0.01% |
11,660
+10,845
| +1,331% | +$116K |
|
5039
PUT
California Resources
CRC
$4.59B
| $101K | ﹤0.01% |
2,300
-3,400
| -60% | -$161K |
|
5040
PUT
Dana Inc
DAN
$2.86B
| $101K | ﹤0.01% |
7,600
+200
| +3% | +$2.88K |
|
|
DESP
5041
PUT
DELISTED
Despegar.com
DESP
| $101K | ﹤0.01% |
5,400
-11,400
| -68% | -$219K |
|
|
ESPR
5042
CALL
DELISTED
Esperion Therapeutics
ESPR
| $101K | ﹤0.01% |
70,700
-373,600
| -84% | -$688K |
|
5043
Leggett & Platt
LEG
$1.36B
| $101K | ﹤0.01% |
12,890
+11,299
| +710% | +$107K |
|
5044
PUT
Perma-Fix Environmental Services
PESI
$352M
| $101K | ﹤0.01% |
13,900
+7,400
| +114% | +$66.5K |
|
5045
CALL
PTC Therapeutics
PTCT
$5.65B
| $101K | ﹤0.01% |
2,000
+400
| +25% | +$20K |
|
5046
The RealReal
REAL
$1.46B
| $101K | ﹤0.01% |
18,886
+18,717
| +11,075% | +$142K |
|
5047
CALL
Saic
SAIC
$4.94B
| $101K | ﹤0.01% |
900
-900
| -50% | -$97.2K |
|
5048
PUT
Sabra Healthcare REIT
SBRA
$5.36B
| $101K | ﹤0.01% |
5,800
-2,600
| -31% | -$43.8K |
|
|
PAL
5049
Proficient Auto Logistics
PAL
$186M
| $101K | ﹤0.01% |
+12,114
| New | +$120K |
|
|
QQQP
5050
Tradr 2X Long Innovation 100 Quarterly ETF
QQQP
$17.6M
| $101K | ﹤0.01% |
+920
| New | +$121K |
|
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.