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 |
Amazon
AMZN
|
+$168M |
| 2 |
NVIDIA
NVDA
|
+$141M |
| 3 |
TSMC
TSM
|
+$121M |
| 4 |
Meta Platforms (Facebook)
META
|
+$107M |
| 5 |
SPDR Gold Trust
GLD
|
+$103M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$174M |
| 2 |
Western Digital
WDC
|
+$87.7M |
| 3 |
Broadcom
AVGO
|
+$62.2M |
| 4 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$52M |
| 5 |
Netflix
NFLX
|
+$44.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.3% |
| 2 | Technology | 0.62% |
| 3 | Communication Services | 0.22% |
| 4 | Consumer Discretionary | 0.21% |
| 5 | Healthcare | 0.2% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2851
CALL
Tyson Foods
TSN
$17.8B
| $718K | ﹤0.01% |
11,200
-125,500
| -92% | -$7.79M |
|
2852
PUT
Domino's
DPZ
$9.91B
| $718K | ﹤0.01% |
2,000
-1,000
| -33% | -$395K |
|
2853
CALL
Kopin
KOPN
$855M
| $717K | ﹤0.01% |
318,700
-122,400
| -28% | -$296K |
|
|
AMRZ
2854
PUT
Amrize Ltd
AMRZ
$20.4B
| $717K | ﹤0.01% |
12,800
-27,600
| -68% | -$1.58M |
|
2855
Amplify Energy
AMPY
$175M
| $716K | ﹤0.01% |
+114,802
| New | +$624K |
|
2856
PUT
Cannae Holdings
CNNE
$665M
| $716K | ﹤0.01% |
+63,000
| New | +$846K |
|
|
SKE
2857
PUT
Skeena Resources
SKE
$3.73B
| $716K | ﹤0.01% |
24,100
+8,700
| +56% | +$267K |
|
2858
Sprouts Farmers Market
SFM
$6.19B
| $715K | ﹤0.01% |
+9,271
| New | +$692K |
|
2859
CALL
Westlake Corp
WLK
$7.96B
| $713K | ﹤0.01% |
6,100
+3,000
| +97% | +$291K |
|
2860
CALL
United Bankshares
UBSI
$6.26B
| $712K | ﹤0.01% |
+17,200
| New | +$715K |
|
2861
PUT
Dentsply Sirona
XRAY
$1.77B
| $711K | ﹤0.01% |
61,300
-13,000
| -17% | -$162K |
|
2862
CALL
Adecoagro
AGRO
$1.46B
| $710K | ﹤0.01% |
47,300
+27,900
| +144% | +$276K |
|
2863
Rithm Capital
RITM
$4.99B
| $709K | ﹤0.01% |
74,822
-197,080
| -72% | -$2.06M |
|
2864
CALL
Western Midstream Partners
WES
$18.3B
| $708K | ﹤0.01% |
+17,200
| New | +$711K |
|
2865
PUT
Kinetik
KNTK
$4.04B
| $707K | ﹤0.01% |
14,600
+13,500
| +1,227% | +$575K |
|
2866
CALL
Martin Marietta Materials
MLM
$34.1B
| $706K | ﹤0.01% |
1,200
+1,000
| +500% | +$638K |
|
|
PSIX
2867
CALL
Power Solutions International
PSIX
$1.06B
| $706K | ﹤0.01% |
11,600
+7,600
| +190% | +$542K |
|
2868
PUT
RBC Bearings
RBC
$15.8B
| $706K | ﹤0.01% |
1,300
+1,200
| +1,200% | +$637K |
|
2869
CALL
Tradeweb Markets
TW
$21.3B
| $706K | ﹤0.01% |
6,000
+5,700
| +1,900% | +$652K |
|
2870
Lowe's Companies
LOW
$103B
| $706K | ﹤0.01% |
+2,987
| New | +$779K |
|
2871
PUT
Enliven Therapeutics
ELVN
$3.36B
| $706K | ﹤0.01% |
18,000
+100
| +0.6% | +$2.77K |
|
2872
PUT
Compass
COMP
$6.82B
| $705K | ﹤0.01% |
96,400
+54,600
| +131% | +$574K |
|
2873
CALL
ACM Research
ACMR
$5.64B
| $704K | ﹤0.01% |
17,900
-24,800
| -58% | -$1.32M |
|
2874
Polaris
PII
$2.97B
| $704K | ﹤0.01% |
12,922
-91
| -0.7% | -$5.7K |
|
|
JHG
2875
PUT
DELISTED
Janus Henderson
JHG
| $704K | ﹤0.01% |
13,700
+11,100
| +427% | +$550K |
|
Similar funds
Simplex Trading's Q1 2026 Portfolio in Review
As of Q1 2026, Simplex Trading held 10,500 positions worth $149B, down 16% from $177B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q1 2026 filing shows 2,157 new, 2,651 increased, 3,926 reduced and 1,574 closed positions. Its largest new stake was Amazon: 764,884 shares worth $159M. The largest sale was Apple, an estimated $174M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, up from 98% a quarter earlier, followed by Technology and Communication Services.
- Simplex Trading's largest Q1 2026 buy was Amazon: 764,884 shares worth $159M.
- Simplex Trading added most to NVIDIA in Q1 2026, an estimated $141M increase.
- Simplex Trading's biggest Q1 2026 reduction was Apple, cutting an estimated $174M.
- Simplex Trading fully exited Direxion Daily Semiconductor Bull 3X ETF in Q1 2026, selling an estimated $52M.
- Simplex Trading's ten largest holdings make up 51% of its $149B portfolio in Q1 2026.
- Simplex Trading opened 2,157 new positions and closed 1,574 in Q1 2026.
- Simplex Trading's portfolio value fell 16% quarter-over-quarter to $149B.
Based on Simplex Trading's 13F filing for Q1 2026, filed 14 May 2026.