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 | |
|---|---|---|---|---|---|---|
4726
Viavi Solutions
VIAV
$8.65B
| $137K | ﹤0.01% |
12,275
+10,022
| +445% | +$112K |
|
|
TSSI
4727
PUT
TSS Inc
TSSI
$273M
| $137K | ﹤0.01% |
17,500
+13,000
| +289% | +$155K |
|
4728
Global X Autonomous & Electric Vehicles ETF
DRIV
$377M
| $136K | ﹤0.01% |
6,478
+2,679
| +71% | +$61.8K |
|
4729
PUT
First Financial Bankshares
FFIN
$5B
| $136K | ﹤0.01% |
3,800
-1,600
| -30% | -$58.7K |
|
4730
CALL
Harmony Biosciences
HRMY
$2.08B
| $136K | ﹤0.01% |
4,100
-600
| -13% | -$21.5K |
|
4731
PUT
NGL Energy Partners
NGL
$2.01B
| $136K | ﹤0.01% |
30,000
-27,700
| -48% | -$138K |
|
4732
PetMed Express
PETS
$42.3M
| $136K | ﹤0.01% |
32,641
+29,928
| +1,103% | +$136K |
|
4733
CALL
Westlake Chemical Partners
WLKP
$766M
| $136K | ﹤0.01% |
5,900
-2,000
| -25% | -$47.6K |
|
|
PAL
4734
PUT
Proficient Auto Logistics
PAL
$187M
| $136K | ﹤0.01% |
+16,300
| New | +$161K |
|
|
EQC
4735
CALL
DELISTED
Equity Commonwealth
EQC
| $136K | ﹤0.01% |
84,700
| – | – |
|
4736
AMC Global Media
AMCX
$427M
| $135K | ﹤0.01% |
19,655
-3,428
| -15% | -$28.7K |
|
4737
CALL
Customers Bancorp
CUBI
$2.65B
| $135K | ﹤0.01% |
2,700
-8,600
| -76% | -$451K |
|
|
DADA
4738
PUT
DELISTED
Dada Nexus
DADA
| $135K | ﹤0.01% |
73,200
+67,500
| +1,184% | +$116K |
|
4739
CALL
Editas Medicine
EDIT
$413M
| $135K | ﹤0.01% |
116,900
+81,200
| +227% | +$119K |
|
4740
CALL
Farmers National Banc Corp
FMNB
$941M
| $135K | ﹤0.01% |
10,400
+9,000
| +643% | +$123K |
|
|
SCS
4741
PUT
DELISTED
Steelcase
SCS
| $135K | ﹤0.01% |
12,400
+10,000
| +417% | +$115K |
|
4742
PUT
SandRidge Energy
SD
$501M
| $135K | ﹤0.01% |
11,900
-6,700
| -36% | -$79.5K |
|
4743
CALL
Steris
STE
$22.5B
| $135K | ﹤0.01% |
600
-6,500
| -92% | -$1.43M |
|
4744
Neuronetics
STIM
$137M
| $135K | ﹤0.01% |
+36,873
| New | +$135K |
|
4745
PUT
TMC The Metals Company
TMC
$1.57B
| $135K | ﹤0.01% |
78,900
-333,300
| -81% | -$560K |
|
4746
PUT
Ibotta
IBTA
$614M
| $135K | ﹤0.01% |
3,200
+2,000
| +167% | +$117K |
|
4747
GoodRx Holdings
GDRX
$1.07B
| $134K | ﹤0.01% |
30,514
+15,282
| +100% | +$71.7K |
|
|
ADAM
4748
CALL
Adamas Trust
ADAM
$803M
| $134K | ﹤0.01% |
20,800
+5,400
| +35% | +$34.4K |
|
4749
PUT
Talos Energy
TALO
$2.44B
| $134K | ﹤0.01% |
13,800
-238,200
| -95% | -$2.26M |
|
|
SW
4750
Smurfit Westrock
SW
$24.9B
| $134K | ﹤0.01% |
2,975
-286
| -9% | -$14.5K |
|
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.