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 | |
|---|---|---|---|---|---|---|
4551
CALL
Kopin
KOPN
$586M
| $160K | ﹤0.01% |
172,500
+118,400
| +219% | +$174K |
|
4552
YieldMax NVDA Option Income Strategy ETF
NVDY
$1.29B
| $160K | ﹤0.01% |
10,448
-19,449
| -65% | -$382K |
|
4553
Oshkosh
OSK
$8.82B
| $160K | ﹤0.01% |
+1,710
| New | +$171K |
|
4554
CALL
Perion Network
PERI
$380M
| $160K | ﹤0.01% |
19,700
-18,900
| -49% | -$165K |
|
4555
CALL
RBC Bearings
RBC
$17.4B
| $160K | ﹤0.01% |
500
+100
| +25% | +$33.7K |
|
4556
CALL
Sonos
SONO
$2.09B
| $160K | ﹤0.01% |
15,000
-14,000
| -48% | -$184K |
|
|
TE
4557
T1 Energy
TE
$1.04B
| $160K | ﹤0.01% |
127,667
+50,792
| +66% | +$93.7K |
|
4558
CALL
Alta Equipment Group
ALTG
$194M
| $159K | ﹤0.01% |
34,000
+16,300
| +92% | +$102K |
|
4559
Atkore
ATKR
$2.41B
| $159K | ﹤0.01% |
+2,657
| New | +$190K |
|
4560
CALL
Clarivate
CLVT
$1.38B
| $159K | ﹤0.01% |
40,700
+28,500
| +234% | +$135K |
|
4561
PUT
Crexendo
CXDO
$217M
| $159K | ﹤0.01% |
32,800
+27,300
| +496% | +$160K |
|
4562
CALL
Inspire Medical Systems
INSP
$1.47B
| $159K | ﹤0.01% |
1,000
-5,800
| -85% | -$1.05M |
|
4563
PUT
Janux Therapeutics
JANX
$912M
| $159K | ﹤0.01% |
5,900
+900
| +18% | +$33.9K |
|
|
KREF
4564
KKR Real Estate Finance Trust
KREF
$466M
| $159K | ﹤0.01% |
14,776
-9,123
| -38% | -$98.3K |
|
4565
PUT
Playtika
PLTK
$1.53B
| $159K | ﹤0.01% |
30,900
-500
| -2% | -$3.14K |
|
4566
CALL
Bruker
BRKR
$9.4B
| $158K | ﹤0.01% |
3,800
+3,100
| +443% | +$161K |
|
4567
PUT
United States Copper Index Fund
CPER
$742M
| $158K | ﹤0.01% |
+5,000
| New | +$144K |
|
4568
CALL
Hexcel
HXL
$7.97B
| $158K | ﹤0.01% |
2,900
-1,100
| -28% | -$68.7K |
|
4569
ICL Group
ICL
$6.58B
| $158K | ﹤0.01% |
27,784
-48,220
| -63% | -$284K |
|
|
JKS
4570
JinkoSolar
JKS
$764M
| $158K | ﹤0.01% |
8,529
-4,918
| -37% | -$109K |
|
4571
MasTec
MTZ
$22.7B
| $158K | ﹤0.01% |
1,360
-5,060
| -79% | -$683K |
|
|
ACH
4572
CALL
Accendra Health
ACH
$254M
| $158K | ﹤0.01% |
17,500
+14,100
| +415% | +$149K |
|
|
SGMO
4573
DELISTED
SANGAMO THERAPEUTICS INC
SGMO
| $158K | ﹤0.01% |
242,294
+49,756
| +26% | +$52.7K |
|
|
SPTN
4574
CALL
DELISTED
SpartanNash
SPTN
| $158K | ﹤0.01% |
7,800
-12,800
| -62% | -$246K |
|
4575
CALL
TriNet
TNET
$3.23B
| $158K | ﹤0.01% |
2,000
-3,500
| -64% | -$291K |
|
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.