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 | |
|---|---|---|---|---|---|---|
|
NSLR
3851
Neostellar Capital Corp
NSLR
$269M
| $326K | ﹤0.01% |
65,640
+27,672
| +73% | +$161K |
|
3852
Talkspace
TALK
$873M
| $326K | ﹤0.01% |
127,697
+99,343
| +350% | +$310K |
|
|
TEN
3853
Tsakos Energy Navigation Ltd
TEN
$1.18B
| $326K | ﹤0.01% |
19,160
+15,772
| +466% | +$275K |
|
3854
PUT
Uranium Energy
UEC
$4.67B
| $325K | ﹤0.01% |
68,200
-86,600
| -56% | -$543K |
|
|
UNIT
3855
Uniti Group
UNIT
$2.53B
| $325K | ﹤0.01% |
+64,568
| New | +$349K |
|
3856
CALL
Vanguard FTSE Developed Markets ETF
VEA
$225B
| $325K | ﹤0.01% |
6,400
-19,900
| -76% | -$1.01M |
|
|
ZEPP
3857
PUT
Zepp Health
ZEPP
$68M
| $325K | ﹤0.01% |
+110,100
| New | +$328K |
|
|
ACB
3858
CALL
Aurora Cannabis
ACB
$168M
| $324K | ﹤0.01% |
73,900
-546,300
| -88% | -$2.58M |
|
3859
Byrna Technologies
BYRN
$90.1M
| $324K | ﹤0.01% |
19,299
-9,967
| -34% | -$258K |
|
3860
PUT
Sally Beauty Holdings
SBH
$1.48B
| $324K | ﹤0.01% |
35,900
+21,000
| +141% | +$207K |
|
3861
PUT
Badger Meter
BMI
$3.9B
| $323K | ﹤0.01% |
1,700
| – | – |
|
|
CNR
3862
PUT
Core Natural Resources Inc
CNR
$4.02B
| $323K | ﹤0.01% |
4,200
-82,100
| -95% | -$6.94M |
|
|
HITI
3863
CALL
High Tide
HITI
$181M
| $322K | ﹤0.01% |
170,700
+6,800
| +4% | +$17.9K |
|
3864
Invesco Mortgage Capital
IVR
$769M
| $322K | ﹤0.01% |
40,901
-3,184
| -7% | -$26.8K |
|
|
JKS
3865
CALL
JinkoSolar
JKS
$782M
| $322K | ﹤0.01% |
17,300
-32,300
| -65% | -$719K |
|
3866
Direxion Daily Small Cap Bear 3x ETF
TZA
$245M
| $322K | ﹤0.01% |
+1,894
| New | +$262K |
|
3867
Beam Therapeutics
BEAM
$2.7B
| $321K | ﹤0.01% |
16,467
+10,571
| +179% | +$277K |
|
3868
CALL
Microvision
MVIS
$86.6M
| $321K | ﹤0.01% |
258,900
-321,100
| -55% | -$447K |
|
3869
PUT
Extreme Networks
EXTR
$3.92B
| $320K | ﹤0.01% |
24,200
+2,700
| +13% | +$42.3K |
|
3870
Idexx Laboratories
IDXX
$44.9B
| $320K | ﹤0.01% |
+762
| New | +$331K |
|
3871
ADT
ADT
$5.38B
| $319K | ﹤0.01% |
+39,210
| New | +$296K |
|
3872
PUT
Macerich
MAC
$7.52B
| $319K | ﹤0.01% |
18,600
-72,700
| -80% | -$1.39M |
|
3873
Ingles Markets
IMKTA
$1.71B
| $318K | ﹤0.01% |
4,883
-455
| -9% | -$29K |
|
3874
PUT
SSR Mining
SSRM
$5.27B
| $318K | ﹤0.01% |
31,800
-37,800
| -54% | -$349K |
|
3875
PUT
Visteon
VC
$2.85B
| $318K | ﹤0.01% |
4,100
-2,100
| -34% | -$177K |
|
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.