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 | |
|---|---|---|---|---|---|---|
3926
CALL
Protolabs
PRLB
$1.78B
| $297K | ﹤0.01% |
8,500
| – | – |
|
3927
PUT
Check Point Software Technologies
CHKP
$14.1B
| $296K | ﹤0.01% |
1,300
+500
| +63% | +$106K |
|
3928
PUT
Pagaya Technologies
PGY
$1.38B
| $296K | ﹤0.01% |
28,300
-9,100
| -24% | -$101K |
|
3929
PUT
BBB Foods
TBBB
$4.81B
| $296K | ﹤0.01% |
+11,100
| New | +$309K |
|
3930
CALL
Alpha and Omega Semiconductor
AOSL
$863M
| $295K | ﹤0.01% |
11,900
+5,600
| +89% | +$187K |
|
|
BRSL
3931
PUT
Brightstar Lottery PLC
BRSL
$1.92B
| $295K | ﹤0.01% |
18,200
-26,000
| -59% | -$449K |
|
3932
CALL
Penumbra
PEN
$12.6B
| $294K | ﹤0.01% |
1,100
-5,500
| -83% | -$1.49M |
|
3933
CALL
Petco
WOOF
$811M
| $294K | ﹤0.01% |
96,400
+2,000
| +2% | +$6.26K |
|
3934
PUT
PACS Group
PACS
$7.43B
| $294K | ﹤0.01% |
26,200
-53,600
| -67% | -$704K |
|
3935
CALL
WisdomTree US Total Dividend Fund
DTD
$1.66B
| $293K | ﹤0.01% |
3,800
+1,200
| +46% | +$93.2K |
|
3936
PUT
Idexx Laboratories
IDXX
$44.9B
| $293K | ﹤0.01% |
700
-300
| -30% | -$130K |
|
3937
PUT
Applied Industrial Technologies
AIT
$12.9B
| $292K | ﹤0.01% |
1,300
-9,900
| -88% | -$2.44M |
|
3938
Builders FirstSource
BLDR
$7.93B
| $292K | ﹤0.01% |
+2,341
| New | +$341K |
|
3939
CALL
Globus Medical
GMED
$10.9B
| $292K | ﹤0.01% |
4,000
-500
| -11% | -$41.3K |
|
|
ATYR
3940
aTyr Pharma
ATYR
$48.4M
| $292K | ﹤0.01% |
96,852
+83,691
| +636% | +$305K |
|
3941
CALL
AutoNation
AN
$7.37B
| $291K | ﹤0.01% |
1,800
-10,000
| -85% | -$1.78M |
|
3942
CALL
Beazer Homes USA
BZH
$913M
| $291K | ﹤0.01% |
14,300
+100
| +0.7% | +$2.4K |
|
3943
Capricor Therapeutics
CAPR
$380M
| $291K | ﹤0.01% |
30,727
-34,483
| -53% | -$479K |
|
3944
CALL
Invesco CurrencyShares Swiss Franc Trust
FXF
$409M
| $291K | ﹤0.01% |
+2,900
| New | +$287K |
|
3945
PUT
Nabors Industries
NBR
$1.12B
| $291K | ﹤0.01% |
7,000
-6,100
| -47% | -$311K |
|
3946
CALL
Universal Corp
UVV
$1.36B
| $291K | ﹤0.01% |
5,200
-2,900
| -36% | -$155K |
|
3947
PUT
Freedom Holding
FRHC
$9.84B
| $290K | ﹤0.01% |
2,200
-9,500
| -81% | -$1.33M |
|
3948
BRC Group Holdings
RILY
$270M
| $290K | ﹤0.01% |
74,984
+7,509
| +11% | +$34.1K |
|
3949
Legend Biotech
LEGN
$3.68B
| $289K | ﹤0.01% |
8,524
-1,786
| -17% | -$64.1K |
|
|
NOVA
3950
CALL
DELISTED
Sunnova Energy
NOVA
| $289K | ﹤0.01% |
779,500
+121,400
| +18% | +$234K |
|
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.