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 |
Netflix
NFLX
|
+$73.1M |
| 2 |
Western Digital
WDC
|
+$51.8M |
| 3 |
iShares Semiconductor ETF
SOXX
|
+$46M |
| 4 |
Meta Platforms (Facebook)
META
|
+$41.8M |
| 5 |
Alibaba
BABA
|
+$37.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$262M |
| 2 |
Microsoft
MSFT
|
+$194M |
| 3 |
iShares Russell 2000 ETF
IWM
|
+$149M |
| 4 |
Apple
AAPL
|
+$119M |
| 5 |
Amazon
AMZN
|
+$107M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.59% |
| 2 | Consumer Discretionary | 0.21% |
| 3 | Healthcare | 0.2% |
| 4 | Industrials | 0.18% |
| 5 | Communication Services | 0.16% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2601
Cenovus Energy
CVE
$54.6B
| $1.01M | ﹤0.01% |
+59,916
| New | +$1.04M |
|
|
SLDE
2602
CALL
Slide Insurance Holdings
SLDE
$2.32B
| $1.01M | ﹤0.01% |
51,900
+34,200
| +193% | +$570K |
|
2603
PUT
Cinemark Holdings
CNK
$3.82B
| $1.01M | ﹤0.01% |
43,500
-48,800
| -53% | -$1.28M |
|
2604
CALL
Pembina Pipeline
PBA
$29.9B
| $1.01M | ﹤0.01% |
26,500
+20,100
| +314% | +$773K |
|
2605
CALL
Natera
NTRA
$37.5B
| $1.01M | ﹤0.01% |
4,400
-17,100
| -80% | -$3.57M |
|
|
PBT
2606
Permian Basin Royalty Trust
PBT
$1.36B
| $1M | ﹤0.01% |
59,028
+13,109
| +29% | +$235K |
|
2607
PUT
Scotiabank
BNS
$106B
| $1M | ﹤0.01% |
13,600
-4,500
| -25% | -$306K |
|
2608
HF Sinclair
DINO
$15.9B
| $1M | ﹤0.01% |
21,731
-4,041
| -16% | -$208K |
|
2609
PUT
Bank of Montreal
BMO
$125B
| $999K | ﹤0.01% |
7,700
-26,100
| -77% | -$3.31M |
|
|
SERV
2610
Serve Robotics
SERV
$409M
| $998K | ﹤0.01% |
96,112
+59,347
| +161% | +$713K |
|
2611
PUT
Herbalife
HLF
$1.23B
| $995K | ﹤0.01% |
77,200
-112,700
| -59% | -$1.19M |
|
2612
ARK Genomic Revolution ETF
ARKG
$1.51B
| $993K | ﹤0.01% |
34,278
-110,406
| -76% | -$3.31M |
|
|
PPL
2613
PPL Corp
PPL
$27.3B
| $991K | ﹤0.01% |
28,297
+21,912
| +343% | +$790K |
|
2614
-1x Short VIX Futures ETF
SVIX
$182M
| $991K | ﹤0.01% |
40,896
-56,038
| -58% | -$1.15M |
|
2615
CALL
Anavex Life Sciences
AVXL
$222M
| $991K | ﹤0.01% |
278,300
+57,000
| +26% | +$349K |
|
2616
PUT
New Fortress Energy
NFE
$101M
| $989K | ﹤0.01% |
867,800
-157,200
| -15% | -$232K |
|
|
SMST
2617
PUT
Defiance Daily Target 2x Short MSTR ETF
SMST
$33.7M
| $987K | ﹤0.01% |
11,700
+10,900
| +1,363% | +$607K |
|
2618
CALL
Kyndryl
KD
$2.66B
| $985K | ﹤0.01% |
37,100
+4,800
| +15% | +$130K |
|
2619
PUT
Bausch Health
BHC
$1.65B
| $985K | ﹤0.01% |
141,700
-379,500
| -73% | -$2.5M |
|
|
DFDV
2620
PUT
DeFi Development Corp
DFDV
$81.3M
| $984K | ﹤0.01% |
251,200
-241,380
| -49% | -$2.21M |
|
2621
PUT
Weibo
WB
$1.9B
| $983K | ﹤0.01% |
96,200
+12,100
| +14% | +$130K |
|
2622
GoPro
GPRO
$116M
| $983K | ﹤0.01% |
697,223
+124,119
| +22% | +$225K |
|
2623
CALL
Grindr
GRND
$2.64B
| $983K | ﹤0.01% |
72,600
+29,700
| +69% | +$404K |
|
2624
Clear Secure
YOU
$5.26B
| $983K | ﹤0.01% |
+28,010
| New | +$954K |
|
2625
CALL
KULR Technology Group
KULR
$117M
| $978K | ﹤0.01% |
330,300
-90,100
| -21% | -$331K |
|
Similar funds
Simplex Trading's Q4 2025 Portfolio in Review
As of Q4 2025, Simplex Trading held 10,526 positions worth $177B, down 9% from $195B the previous quarter. Its ten largest holdings account for 49% of the portfolio.
Simplex Trading withdrew a net $23.2B in Q4 2025, closing 2,184 positions and reducing 4,088 holdings. Its most notable exit was iShares Russell 2000 ETF, an estimated $149M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.59% of assets, down from 0.79% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in Western Digital worth $58.9M.
- Simplex Trading's largest Q4 2025 buy was Western Digital: 341,762 shares worth $58.9M.
- Simplex Trading added most to Netflix in Q4 2025, an estimated $73.1M increase.
- Simplex Trading's biggest Q4 2025 reduction was NVIDIA, cutting an estimated $262M.
- Simplex Trading fully exited iShares Russell 2000 ETF in Q4 2025, selling an estimated $149M.
- Simplex Trading's ten largest holdings make up 49% of its $177B portfolio in Q4 2025.
- Simplex Trading opened 1,476 new positions and closed 2,184 in Q4 2025.
- Simplex Trading's portfolio value fell 9% quarter-over-quarter to $177B.
Based on Simplex Trading's 13F filing for Q4 2025, filed 11 Feb 2026.