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 |
Microsoft
MSFT
|
+$234M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$97.5M |
| 3 |
Amazon
AMZN
|
+$96.8M |
| 4 |
iShares Bitcoin Trust
IBIT
|
+$80.6M |
| 5 |
Pinduoduo
PDD
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$129M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$92.9M |
| 3 |
Broadcom
AVGO
|
+$82.9M |
| 4 |
Alphabet (Google) Class C
GOOG
|
+$68.4M |
| 5 |
Meta Platforms (Facebook)
META
|
+$59.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.79% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Healthcare | 0.25% |
| 4 | Financials | 0.17% |
| 5 | Industrials | 0.09% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2301
iShares US Technology ETF
IYW
$23.7B
| $2.05M | ﹤0.01% |
+10,488
| New | +$1.92M |
|
2302
CALL
RCI Hospitality Holdings
RICK
$199M
| $2.05M | ﹤0.01% |
67,200
+63,900
| +1,936% | +$2.29M |
|
2303
PUT
Parker-Hannifin
PH
$125B
| $2.05M | ﹤0.01% |
2,700
-700
| -21% | -$516K |
|
|
XNET
2304
PUT
Xunlei
XNET
$351M
| $2.05M | ﹤0.01% |
213,900
+182,400
| +579% | +$1.12M |
|
2305
PUT
Restaurant Brands International
QSR
$25.1B
| $2.05M | ﹤0.01% |
31,900
+7,000
| +28% | +$461K |
|
2306
Conagra Brands
CAG
$7.07B
| $2.04M | ﹤0.01% |
111,704
+19,892
| +22% | +$381K |
|
2307
PUT
Ivanhoe Electric
IE
$1.43B
| $2.04M | ﹤0.01% |
162,800
+140,200
| +620% | +$1.39M |
|
|
AIFC
2308
CALL
AI Financial Corp
AIFC
$60.6M
| $2.04M | ﹤0.01% |
+758,600
| New | +$4.54M |
|
2309
PUT
Sun Communities
SUI
$15B
| $2.04M | ﹤0.01% |
15,800
| – | – |
|
2310
CALL
10x Genomics
TXG
$5.87B
| $2.04M | ﹤0.01% |
174,300
+160,500
| +1,163% | +$2.09M |
|
2311
PUT
Klaviyo
KVYO
$4.91B
| $2.04M | ﹤0.01% |
73,500
-78,600
| -52% | -$2.54M |
|
2312
CALL
Coca-Cola Europacific Partners
CCEP
$46.5B
| $2.03M | ﹤0.01% |
22,500
+10,500
| +88% | +$974K |
|
2313
CALL
Genius Sports
GENI
$1.73B
| $2.03M | ﹤0.01% |
164,300
-50,700
| -24% | -$606K |
|
2314
CALL
GXO Logistics
GXO
$6.06B
| $2.03M | ﹤0.01% |
38,400
-73,100
| -66% | -$3.76M |
|
2315
PUT
Sprott Uranium Miners ETF
URNM
$1.78B
| $2.03M | ﹤0.01% |
38,000
+4,400
| +13% | +$221K |
|
2316
CALL
Innovative Industrial Properties
IIPR
$1.78B
| $2.02M | ﹤0.01% |
37,800
+11,100
| +42% | +$604K |
|
|
IRBT
2317
PUT
DELISTED
iRobot
IRBT
| $2.02M | ﹤0.01% |
564,300
+222,100
| +65% | +$859K |
|
2318
CALL
Dave & Buster's
PLAY
$343M
| $2.02M | ﹤0.01% |
111,400
-25,000
| -18% | -$657K |
|
2319
CALL
Comstock Resources
CRK
$3.97B
| $2.02M | ﹤0.01% |
102,000
-64,900
| -39% | -$1.2M |
|
2320
PUT
FIVE9
FIVN
$1.77B
| $2.02M | ﹤0.01% |
83,500
+70,000
| +519% | +$1.85M |
|
2321
AdvisorShares Pure US Cannabis ETF
MSOS
$864M
| $2.02M | ﹤0.01% |
421,735
+144,404
| +52% | +$569K |
|
|
CMA
2322
DELISTED
Comerica
CMA
| $2.02M | ﹤0.01% |
29,480
-25,587
| -46% | -$1.72M |
|
2323
Aurora
AUR
$11.7B
| $2.02M | ﹤0.01% |
374,316
+81,445
| +28% | +$478K |
|
2324
PUT
Aramark
ARMK
$15B
| $2.02M | ﹤0.01% |
52,500
+9,700
| +23% | +$393K |
|
2325
FuboTV Inc
FUBO
$245M
| $2.01M | ﹤0.01% |
40,342
-2,738
| -6% | -$124K |
|
Similar funds
Simplex Trading's Q3 2025 Portfolio in Review
As of Q3 2025, Simplex Trading held 10,358 positions worth $195B, up 12% from $175B the previous quarter. Its ten largest holdings account for 46% of the portfolio.
Simplex Trading's Q3 2025 filing shows 1,743 new, 3,828 increased, 3,250 reduced and 1,308 closed positions. Its largest new stake was Microsoft: 458,309 shares worth $237M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $129M.
By sector, the portfolio is most concentrated in Technology at 0.79% of assets, up from 0.74% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2025 buy was Microsoft: 458,309 shares worth $237M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q3 2025, an estimated $97.5M increase.
- Simplex Trading's biggest Q3 2025 reduction was Alphabet (Google) Class A, cutting an estimated $92.9M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q3 2025, selling an estimated $129M.
- Simplex Trading's ten largest holdings make up 46% of its $195B portfolio in Q3 2025.
- Simplex Trading opened 1,743 new positions and closed 1,308 in Q3 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $195B.
Based on Simplex Trading's 13F filing for Q3 2025, filed 12 Nov 2025.