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 | Miscellaneous | 98.56% |
| 2 | Technology | 0.41% |
| 3 | Consumer Discretionary | 0.22% |
| 4 | Healthcare | 0.17% |
| 5 | Communication Services | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1076
PUT
Oneok
OKE
$60.2B
| $7.23M | ﹤0.01% |
72,900
-37,700
| -34% | -$3.74M |
|
1077
CALL
Royal Bank of Canada
RY
$292B
| $7.21M | ﹤0.01% |
64,000
-26,500
| -29% | -$3.12M |
|
1078
State Street Consumer Staples Select Sector SPDR ETF
XLP
$14.5B
| $7.21M | ﹤0.01% |
88,343
+25,500
| +41% | +$2.04M |
|
1079
CALL
Teradyne
TER
$55.8B
| $7.2M | ﹤0.01% |
87,200
-21,500
| -20% | -$2.41M |
|
1080
CALL
Albertsons Companies
ACI
$6.09B
| $7.19M | ﹤0.01% |
327,000
-284,700
| -47% | -$5.87M |
|
1081
CALL
Alcoa
AA
$13.2B
| $7.17M | ﹤0.01% |
235,000
-101,500
| -30% | -$3.55M |
|
1082
iShares MSCI Emerging Markets ETF
EEM
$31.9B
| $7.16M | ﹤0.01% |
163,914
-1,933
| -1% | -$84K |
|
1083
Nice
NICE
$6.18B
| $7.16M | ﹤0.01% |
46,451
+27,970
| +151% | +$4.47M |
|
1084
PUT
GitLab
GTLB
$8.3B
| $7.16M | ﹤0.01% |
152,300
-29,600
| -16% | -$1.81M |
|
1085
CALL
Axsome Therapeutics
AXSM
$10.8B
| $7.14M | ﹤0.01% |
61,200
-104,400
| -63% | -$11.9M |
|
1086
CALL
Grayscale Bitcoin Trust
GBTC
$12B
| $7.12M | ﹤0.01% |
109,300
+20,000
| +22% | +$1.47M |
|
1087
CALL
Abercrombie & Fitch
ANF
$6.65B
| $7.06M | ﹤0.01% |
92,400
-7,900
| -8% | -$851K |
|
1088
CALL
Avantor
AVTR
$10.1B
| $7.06M | ﹤0.01% |
435,300
+192,000
| +79% | +$3.64M |
|
1089
AST SpaceMobile
ASTS
$18.7B
| $7.03M | ﹤0.01% |
309,098
+36,850
| +14% | +$943K |
|
1090
CALL
Barclays
BCS
$90.6B
| $7.02M | ﹤0.01% |
456,800
-383,600
| -46% | -$5.74M |
|
1091
First Solar
FSLR
$22B
| $7.01M | ﹤0.01% |
+55,440
| New | +$8.66M |
|
1092
PUT
Travelers Companies
TRV
$77B
| $7.01M | ﹤0.01% |
26,500
+18,300
| +223% | +$4.56M |
|
1093
PUT
Regency Centers
REG
$13.8B
| $7M | ﹤0.01% |
+94,900
| New | +$6.91M |
|
1094
CALL
C3.ai
AI
$1.67B
| $6.99M | ﹤0.01% |
332,200
-716,400
| -68% | -$20.3M |
|
1095
PUT
Edwards Lifesciences
EW
$51.8B
| $6.98M | ﹤0.01% |
96,300
-51,000
| -35% | -$3.65M |
|
1096
PUT
Flutter Entertainment
FLUT
$17.4B
| $6.96M | ﹤0.01% |
31,400
+29,100
| +1,265% | +$7.54M |
|
1097
PUT
APA Corp
APA
$15B
| $6.95M | ﹤0.01% |
330,500
-340,700
| -51% | -$7.49M |
|
1098
CALL
Cboe Global Markets
CBOE
$31.2B
| $6.95M | ﹤0.01% |
30,700
-94,500
| -75% | -$19.6M |
|
1099
Petrobras
PBR
$130B
| $6.94M | ﹤0.01% |
483,943
+114,123
| +31% | +$1.57M |
|
1100
PUT
Ferguson
FERG
$44.2B
| $6.94M | ﹤0.01% |
43,300
+39,400
| +1,010% | +$6.83M |
|
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's Q1 2025 filing shows 1,566 new, 3,139 increased, 3,654 reduced and 1,547 closed positions. Its largest new stake was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M. The largest sale was Apple, an estimated $518M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- 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.