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 | |
|---|---|---|---|---|---|---|
3076
PUT
WisdomTree US Total Dividend Fund
DTD
$1.65B
| $670K | ﹤0.01% |
6,200
+4,900
| +377% | +$381K |
|
3077
CALL
Under Armour Class C
UA
$2.97B
| $670K | ﹤0.01% |
109,400
-141,000
| -56% | -$960K |
|
|
ZH
3078
PUT
Zhihu
ZH
$276M
| $670K | ﹤0.01% |
+157,100
| New | +$684K |
|
3079
Franklin Resources
BEN
$17.3B
| $669K | ﹤0.01% |
34,775
+31,447
| +945% | +$630K |
|
3080
CALL
United States Antimony
UAMY
$790M
| $669K | ﹤0.01% |
304,500
+5,400
| +2% | +$9.36K |
|
3081
PUT
Sportradar
SRAD
$4.36B
| $668K | ﹤0.01% |
30,900
+30,100
| +3,763% | +$628K |
|
3082
PUT
Brookfield Infrastructure Partners
BIP
$18.7B
| $667K | ﹤0.01% |
22,400
+15,900
| +245% | +$499K |
|
3083
Monolithic Power Systems
MPWR
$64.8B
| $667K | ﹤0.01% |
+1,151
| New | +$725K |
|
3084
PUT
Nokia
NOK
$50.2B
| $667K | ﹤0.01% |
126,700
+57,700
| +84% | +$282K |
|
3085
Vanguard FTSE Europe ETF
VGK
$30.1B
| $667K | ﹤0.01% |
9,502
+5,442
| +134% | +$375K |
|
3086
Biohaven
BHVN
$2.17B
| $666K | ﹤0.01% |
+27,728
| New | +$978K |
|
3087
Allegro MicroSystems
ALGM
$8.39B
| $665K | ﹤0.01% |
+26,468
| New | +$661K |
|
3088
Bank OZK
OZK
$5.57B
| $664K | ﹤0.01% |
+15,298
| New | +$724K |
|
|
3089
CALL
Biohaven
BHVN
$2.17B
| $663K | ﹤0.01% |
27,600
-8,000
| -22% | -$282K |
|
3090
CALL
Amprius Technologies
AMPX
$1.32B
| $660K | ﹤0.01% |
246,300
-104,000
| -30% | -$307K |
|
3091
PUT
Calumet Specialty Products
CLMT
$3.54B
| $660K | ﹤0.01% |
52,100
-270,600
| -84% | -$4.25M |
|
3092
CALL
MaxLinear
MXL
$5.8B
| $659K | ﹤0.01% |
60,700
+30,200
| +99% | +$505K |
|
3093
PUT
BlackLine
BL
$1.79B
| $658K | ﹤0.01% |
+13,600
| New | +$745K |
|
3094
Perion Network
PERI
$373M
| $658K | ﹤0.01% |
80,903
+61,295
| +313% | +$535K |
|
|
DM
3095
CALL
DELISTED
Desktop Metal, Inc.
DM
| $658K | ﹤0.01% |
134,200
+52,900
| +65% | +$137K |
|
3096
PUT
Alphatec Holdings
ATEC
$1.35B
| $656K | ﹤0.01% |
64,700
-30,800
| -32% | -$331K |
|
3097
Cracker Barrel
CBRL
$1.14B
| $655K | ﹤0.01% |
16,878
+11,284
| +202% | +$568K |
|
3098
CALL
Jack in the Box
JACK
$300M
| $655K | ﹤0.01% |
24,100
-70,800
| -75% | -$2.61M |
|
3099
CALL
Universal Display
OLED
$3.77B
| $655K | ﹤0.01% |
4,700
-25,000
| -84% | -$3.74M |
|
3100
CALL
Chemours
CC
$2.56B
| $654K | ﹤0.01% |
48,400
-38,600
| -44% | -$641K |
|
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.