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 | |
|---|---|---|---|---|---|---|
2751
BJs Wholesale Club
BJ
$11.9B
| $943K | ﹤0.01% |
8,269
-18,632
| -69% | -$1.92M |
|
2752
CALL
New Oriental
EDU
$7.84B
| $941K | ﹤0.01% |
19,700
-9,900
| -33% | -$509K |
|
2753
Eldorado Gold
EGO
$8.31B
| $939K | ﹤0.01% |
+55,863
| New | +$839K |
|
2754
CALL
Axcelis
ACLS
$4.12B
| $938K | ﹤0.01% |
18,900
+13,100
| +226% | +$828K |
|
2755
Kosmos Energy
KOS
$1.56B
| $938K | ﹤0.01% |
411,681
+62,744
| +18% | +$185K |
|
2756
iShares MSCI USA Momentum Factor ETF
MTUM
$25.6B
| $938K | ﹤0.01% |
+4,641
| New | +$992K |
|
2757
PUT
MKS Inc
MKSI
$22.2B
| $937K | ﹤0.01% |
11,700
+11,100
| +1,850% | +$1.12M |
|
2758
CALL
Urban Outfitters
URBN
$5.99B
| $937K | ﹤0.01% |
17,900
-233,600
| -93% | -$12.8M |
|
2759
DXC Technology
DXC
$1.63B
| $936K | ﹤0.01% |
+54,912
| New | +$1.07M |
|
2760
PUT
Xerox
XRX
$337M
| $936K | ﹤0.01% |
193,900
-9,900
| -5% | -$74.3K |
|
2761
CALL
KULR Technology Group
KULR
$117M
| $935K | ﹤0.01% |
88,575
+12,625
| +17% | +$197K |
|
|
LAZR
2762
PUT
DELISTED
Luminar Technologies
LAZR
| $935K | ﹤0.01% |
173,600
-165,000
| -49% | -$998K |
|
2763
CALL
Markel Group
MKL
$25B
| $934K | ﹤0.01% |
500
+100
| +25% | +$184K |
|
2764
CALL
MasTec
MTZ
$26.7B
| $933K | ﹤0.01% |
8,000
-18,500
| -70% | -$2.5M |
|
2765
CALL
Flowserve
FLS
$9.25B
| $932K | ﹤0.01% |
19,100
-8,100
| -30% | -$460K |
|
2766
CALL
Vaxcyte
PCVX
$7.89B
| $932K | ﹤0.01% |
24,700
+14,400
| +140% | +$1.15M |
|
2767
Raymond James Financial
RJF
$32.5B
| $931K | ﹤0.01% |
+6,706
| New | +$1.04M |
|
2768
Ovintiv
OVV
$17.5B
| $930K | ﹤0.01% |
21,735
+10,330
| +91% | +$441K |
|
2769
CALL
Credit Acceptance
CACC
$6B
| $929K | ﹤0.01% |
1,800
+1,400
| +350% | +$692K |
|
2770
CALL
Sunoco
SUN
$14.2B
| $928K | ﹤0.01% |
16,000
+11,400
| +248% | +$645K |
|
2771
PUT
Open Text
OTEX
$5.43B
| $927K | ﹤0.01% |
36,700
+20,700
| +129% | +$568K |
|
2772
CALL
DT Midstream
DTM
$14.9B
| $926K | ﹤0.01% |
9,600
+9,400
| +4,700% | +$940K |
|
2773
CALL
Invesco
IVZ
$13.3B
| $926K | ﹤0.01% |
61,100
-225,300
| -79% | -$3.84M |
|
2774
LCI Industries
LCII
$2.51B
| $923K | ﹤0.01% |
+10,561
| New | +$1.06M |
|
2775
PUT
Anavex Life Sciences
AVXL
$222M
| $922K | ﹤0.01% |
107,500
+33,200
| +45% | +$314K |
|
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.