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 | |
|---|---|---|---|---|---|---|
3651
CALL
Gossamer Bio
GOSS
$100M
| $394K | ﹤0.01% |
358,600
+70,500
| +24% | +$81.5K |
|
3652
PUT
O-I Glass
OI
$1.39B
| $394K | ﹤0.01% |
34,400
+29,500
| +602% | +$336K |
|
3653
CALL
Calix
CALX
$2.34B
| $393K | ﹤0.01% |
11,100
-1,000
| -8% | -$37.1K |
|
3654
PUT
Vivid Seats
SEAT
$88.7M
| $392K | ﹤0.01% |
6,635
+750
| +13% | +$60.4K |
|
3655
CALL
Suburban Propane Partners
SPH
$1.24B
| $392K | ﹤0.01% |
18,700
+8,000
| +75% | +$163K |
|
3656
CALL
Avery Dennison
AVY
$12.9B
| $391K | ﹤0.01% |
2,200
-800
| -27% | -$147K |
|
3657
CALL
Immatics
IMTX
$1.19B
| $391K | ﹤0.01% |
86,800
-25,000
| -22% | -$130K |
|
3658
CALL
Allegro MicroSystems
ALGM
$8.29B
| $389K | ﹤0.01% |
15,500
-11,400
| -42% | -$285K |
|
3659
PUT
Coeur Mining
CDE
$15.4B
| $389K | ﹤0.01% |
65,800
-60,100
| -48% | -$371K |
|
|
MASI
3660
DELISTED
Masimo
MASI
| $389K | ﹤0.01% |
2,338
+1,513
| +183% | +$263K |
|
|
DFTX
3661
PUT
Definium Therapeutics
DFTX
$5.57B
| $389K | ﹤0.01% |
66,500
-2,300
| -3% | -$16.5K |
|
3662
PUT
AGCO
AGCO
$8.96B
| $388K | ﹤0.01% |
4,200
+2,900
| +223% | +$283K |
|
|
LPRO
3663
Open Lending Corp
LPRO
$373M
| $388K | ﹤0.01% |
+140,774
| New | +$700K |
|
3664
Direxion Daily MSFT Bull 2X ETF
MSFU
$825M
| $388K | ﹤0.01% |
13,030
+7,437
| +133% | +$270K |
|
3665
ON Semiconductor
ON
$32.8B
| $388K | ﹤0.01% |
+9,548
| New | +$481K |
|
3666
Portillo's
PTLO
$339M
| $388K | ﹤0.01% |
+32,671
| New | +$425K |
|
3667
PUT
Ameriprise Financial
AMP
$48.3B
| $387K | ﹤0.01% |
800
+300
| +60% | +$157K |
|
3668
Cardiff Oncology
CRDF
$63.6M
| $387K | ﹤0.01% |
123,433
+96,369
| +356% | +$381K |
|
3669
PUT
Huntington Ingalls Industries
HII
$11.8B
| $387K | ﹤0.01% |
1,900
-1,500
| -44% | -$285K |
|
3670
CALL
Humacyte
HUMA
$170M
| $387K | ﹤0.01% |
227,200
+83,000
| +58% | +$312K |
|
|
CRESY
3671
PUT
Cresud
CRESY
$808M
| $386K | ﹤0.01% |
35,296
+6,454
| +22% | +$74.9K |
|
3672
Melco Resorts & Entertainment
MLCO
$2.19B
| $386K | ﹤0.01% |
73,349
-130,896
| -64% | -$737K |
|
|
SHCO
3673
PUT
DELISTED
Soho House & Co
SHCO
| $386K | ﹤0.01% |
62,500
+31,000
| +98% | +$224K |
|
3674
CALL
ThredUp
TDUP
$760M
| $386K | ﹤0.01% |
160,200
+156,100
| +3,807% | +$359K |
|
3675
CALL
Howard Hughes
HHH
$4B
| $385K | ﹤0.01% |
5,200
-4,800
| -48% | -$362K |
|
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.