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 | |
|---|---|---|---|---|---|---|
3951
PUT
Civeo
CVEO
$365M
| $263K | ﹤0.01% |
+11,500
| New | +$255K |
|
3952
Coty
COTY
$2.39B
| $263K | ﹤0.01% |
85,384
-55,774
| -40% | -$203K |
|
3953
CALL
HF Sinclair
DINO
$16.3B
| $263K | ﹤0.01% |
5,700
-11,400
| -67% | -$588K |
|
3954
CALL
IMAX
IMAX
$2.59B
| $262K | ﹤0.01% |
7,100
-18,100
| -72% | -$631K |
|
3955
Simon Property Group
SPG
$76.8B
| $262K | ﹤0.01% |
1,415
-11,297
| -89% | -$2.05M |
|
|
RZLV
3956
Rezolve AI
RZLV
$905M
| $262K | ﹤0.01% |
102,033
-136,302
| -57% | -$514K |
|
3957
CALL
Ambev
ABEV
$48.2B
| $262K | ﹤0.01% |
105,900
+46,600
| +79% | +$111K |
|
3958
PUT
NNN REIT
NNN
$9.35B
| $262K | ﹤0.01% |
6,600
+3,600
| +120% | +$148K |
|
|
DOCU
3959
DocuSign
DOCU
$11.1B
| $261K | ﹤0.01% |
3,820
-17,091
| -82% | -$1.18M |
|
3960
10x Genomics
TXG
$5.85B
| $261K | ﹤0.01% |
+15,986
| New | +$241K |
|
3961
Tradr TSLA Bear Daily ETF
TSLQ
$153M
| $260K | ﹤0.01% |
14,338
-5,907
| -29% | -$131K |
|
3962
PUT
Sun Communities
SUI
$15.5B
| $260K | ﹤0.01% |
2,100
-13,700
| -87% | -$1.71M |
|
3963
PUT
HUB Group
HUBG
$2.88B
| $260K | ﹤0.01% |
6,100
| – | – |
|
3964
Watsco Inc
WSO
$12.7B
| $260K | ﹤0.01% |
771
+723
| +1,506% | +$258K |
|
|
TXNM
3965
PUT
TXNM Energy Inc
TXNM
$6.41B
| $259K | ﹤0.01% |
4,400
-1,600
| -27% | -$92.3K |
|
3966
CALL
Legend Biotech
LEGN
$3.65B
| $259K | ﹤0.01% |
11,900
-25,300
| -68% | -$725K |
|
3967
PUT
EVgo
EVGO
$221M
| $259K | ﹤0.01% |
88,900
-96,800
| -52% | -$352K |
|
3968
ScottsMiracle-Gro
SMG
$4.06B
| $259K | ﹤0.01% |
4,433
+3,876
| +696% | +$217K |
|
3969
CALL
Axos Financial
AX
$5.59B
| $258K | ﹤0.01% |
3,000
-1,800
| -38% | -$148K |
|
3970
Revvity
RVTY
$12.3B
| $258K | ﹤0.01% |
2,669
+2,222
| +497% | +$213K |
|
3971
A.O. Smith
AOS
$8.52B
| $258K | ﹤0.01% |
3,857
-5,175
| -57% | -$350K |
|
3972
Ascent Industries
ACNT
$139M
| $258K | ﹤0.01% |
+15,932
| New | +$219K |
|
3973
PUT
LXP Industrial Trust
LXP
$3.53B
| $258K | ﹤0.01% |
5,200
+4,800
| +1,200% | +$230K |
|
3974
CALL
TAL Education Group
TAL
$6.08B
| $257K | ﹤0.01% |
23,600
+1,500
| +7% | +$17K |
|
3975
Everest Group
EG
$15.7B
| $257K | ﹤0.01% |
+757
| New | +$250K |
|
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.