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 | |
|---|---|---|---|---|---|---|
3201
Western Alliance Bancorporation
WAL
$9.04B
| $599K | ﹤0.01% |
7,799
-15,081
| -66% | -$1.27M |
|
3202
CALL
Broadstone Net Lease
BNL
$4.29B
| $598K | ﹤0.01% |
35,100
+25,600
| +269% | +$415K |
|
3203
PUT
Camtek
CAMT
$7.07B
| $598K | ﹤0.01% |
10,200
-14,800
| -59% | -$1.19M |
|
3204
Arvinas
ARVN
$530M
| $597K | ﹤0.01% |
85,082
+38,175
| +81% | +$598K |
|
3205
ATI
ATI
$26.3B
| $597K | ﹤0.01% |
+11,488
| New | +$652K |
|
3206
PUT
Liquidia Corp
LQDA
$7.51B
| $597K | ﹤0.01% |
40,500
-71,500
| -64% | -$1.04M |
|
3207
CALL
ReNew
RNW
$2.2B
| $597K | ﹤0.01% |
101,400
+84,300
| +493% | +$543K |
|
3208
PUT
Vitesse Energy
VTS
$636M
| $597K | ﹤0.01% |
24,300
+4,900
| +25% | +$125K |
|
3209
Alight
ALIT
$520M
| $596K | ﹤0.01% |
+5,033
| New | +$662K |
|
|
MCW
3210
DELISTED
Mister Car Wash
MCW
| $596K | ﹤0.01% |
75,587
-16,830
| -18% | -$130K |
|
3211
Sturm, Ruger & Co
RGR
$620M
| $596K | ﹤0.01% |
+15,189
| New | +$570K |
|
3212
PUT
Aecom
ACM
$9.12B
| $593K | ﹤0.01% |
6,400
+100
| +2% | +$10.1K |
|
|
MGIC
3213
PUT
DELISTED
Magic Software Enterprises
MGIC
| $593K | ﹤0.01% |
45,700
+45,400
| +15,133% | +$581K |
|
3214
Li Auto
LI
$13.1B
| $592K | ﹤0.01% |
23,528
-322,268
| -93% | -$8.3M |
|
3215
PUT
argenx
ARGX
$55.6B
| $591K | ﹤0.01% |
1,000
-6,700
| -87% | -$4.23M |
|
3216
PUT
Rexford Industrial Realty
REXR
$8.63B
| $591K | ﹤0.01% |
15,100
-8,300
| -35% | -$332K |
|
3217
Invesco CurrencyShares British Pound Sterling Trust
FXB
$76.7M
| $590K | ﹤0.01% |
+4,748
| New | +$576K |
|
|
AL
3218
PUT
DELISTED
Air Lease Corp
AL
| $589K | ﹤0.01% |
12,200
+10,600
| +663% | +$497K |
|
3219
CALL
Roper Technologies
ROP
$37.1B
| $589K | ﹤0.01% |
1,000
+100
| +11% | +$56.1K |
|
3220
Star Bulk Carriers
SBLK
$3.02B
| $589K | ﹤0.01% |
37,896
-8,170
| -18% | -$127K |
|
3221
CALL
Cullen/Frost Bankers
CFR
$10.3B
| $588K | ﹤0.01% |
4,700
-9,700
| -67% | -$1.3M |
|
|
TEN
3222
PUT
Tsakos Energy Navigation Ltd
TEN
$1.18B
| $588K | ﹤0.01% |
34,500
+17,900
| +108% | +$312K |
|
3223
Adecoagro
AGRO
$1.48B
| $587K | ﹤0.01% |
52,591
+51,291
| +3,945% | +$526K |
|
3224
CALL
Charles River Laboratories
CRL
$10.8B
| $587K | ﹤0.01% |
3,900
-28,400
| -88% | -$4.76M |
|
3225
PUT
Ginkgo Bioworks
DNA
$487M
| $587K | ﹤0.01% |
103,100
-49,600
| -32% | -$505K |
|
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.