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 | |
|---|---|---|---|---|---|---|
2751
GraniteShares 2x Long TSLA Daily ETF
TSLR
$60M
| $889K | ﹤0.01% |
27,752
+8,152
| +42% | +$264K |
|
2752
PUT
Yeti Holdings
YETI
$3.82B
| $888K | ﹤0.01% |
20,100
-42,100
| -68% | -$1.62M |
|
2753
KNOT Offshore Partners
KNOP
$355M
| $887K | ﹤0.01% |
85,733
+84,752
| +8,639% | +$821K |
|
2754
Ardelyx
ARDX
$1.24B
| $886K | ﹤0.01% |
151,934
-57,299
| -27% | -$319K |
|
2755
CALL
Arcutis Biotherapeutics
ARQT
$3.42B
| $886K | ﹤0.01% |
30,500
-45,000
| -60% | -$1.15M |
|
|
SVM
2756
CALL
Silvercorp Metals
SVM
$2.13B
| $884K | ﹤0.01% |
106,000
-181,300
| -63% | -$1.32M |
|
|
NXRT
2757
PUT
NexPoint Residential Trust
NXRT
$665M
| $882K | ﹤0.01% |
+29,300
| New | +$898K |
|
2758
CALL
Church & Dwight Co
CHD
$23.1B
| $880K | ﹤0.01% |
10,500
-700
| -6% | -$59.8K |
|
2759
CALL
TORM
TRMD
$3.1B
| $877K | ﹤0.01% |
44,800
-18,900
| -30% | -$399K |
|
2760
CALL
Microvision
MVIS
$88.2M
| $877K | ﹤0.01% |
1,059,200
+228,900
| +28% | +$243K |
|
2761
GitLab
GTLB
$5.28B
| $873K | ﹤0.01% |
23,249
-23,816
| -51% | -$1.03M |
|
2762
PUT
Surgery Partners
SGRY
$2.06B
| $871K | ﹤0.01% |
56,400
+55,900
| +11,180% | +$1.03M |
|
2763
iShares MSCI USA Momentum Factor ETF
MTUM
$25.5B
| $869K | ﹤0.01% |
+3,472
| New | +$872K |
|
2764
Bitwise Bitcoin ETF
BITB
$2.46B
| $868K | ﹤0.01% |
18,246
+11,011
| +152% | +$599K |
|
2765
PUT
BlackBerry
BB
$5.01B
| $867K | ﹤0.01% |
228,700
-360,000
| -61% | -$1.58M |
|
2766
CALL
TTEC Holdings
TTEC
$103M
| $867K | ﹤0.01% |
240,700
+208,200
| +641% | +$708K |
|
|
DPRO
2767
CALL
Draganfly
DPRO
$156M
| $864K | ﹤0.01% |
125,100
-262,800
| -68% | -$2.22M |
|
2768
CALL
Vestis
VSTS
$2.06B
| $864K | ﹤0.01% |
129,500
-235,500
| -65% | -$1.37M |
|
2769
Kaiser Aluminum
KALU
$2.67B
| $864K | ﹤0.01% |
7,520
+7,005
| +1,360% | +$667K |
|
2770
PUT
Boston Properties
BXP
$11B
| $864K | ﹤0.01% |
12,800
-50,500
| -80% | -$3.59M |
|
2771
CALL
Icahn Enterprises
IEP
$5.17B
| $863K | ﹤0.01% |
114,300
+17,700
| +18% | +$143K |
|
2772
PUT
iShares 0-5 Year Investment Grade Corporate Bond ETF
SLQD
$2.36B
| $861K | ﹤0.01% |
12,500
+7,000
| +127% | +$355K |
|
2773
Plexus
PLXS
$6.81B
| $861K | ﹤0.01% |
+5,858
| New | +$859K |
|
2774
CALL
Talos Energy
TALO
$2.49B
| $861K | ﹤0.01% |
78,100
+17,200
| +28% | +$180K |
|
2775
Quest Diagnostics
DGX
$25.1B
| $860K | ﹤0.01% |
4,958
+4,147
| +511% | +$755K |
|
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.