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 | |
|---|---|---|---|---|---|---|
3051
CALL
Medifast
MED
$110M
| $996K | ﹤0.01% |
72,900
+55,300
| +314% | +$772K |
|
3052
CALL
Impinj
PI
$3.97B
| $994K | ﹤0.01% |
5,500
+100
| +2% | +$15.8K |
|
3053
YPF
YPF
$20B
| $992K | ﹤0.01% |
40,859
+39,352
| +2,611% | +$1.21M |
|
|
UHT
3054
PUT
Universal Health Realty Income Trust
UHT
$614M
| $991K | ﹤0.01% |
+25,300
| New | +$1.02M |
|
|
CRON
3055
Cronos Group
CRON
$1.07B
| $987K | ﹤0.01% |
355,352
+330,130
| +1,309% | +$777K |
|
3056
Direxion Daily Junior Gold Miners Index Bull 2X ETF
JNUG
$378M
| $987K | ﹤0.01% |
6,056
-7
| -0.1% | -$713 |
|
3057
PUT
Philips
PHG
$24.3B
| $984K | ﹤0.01% |
37,440
+14,623
| +64% | +$375K |
|
|
GEMI
3058
PUT
Gemini Space Station
GEMI
$563M
| $984K | ﹤0.01% |
+41,100
| New | +$1.06M |
|
3059
CALL
New Fortress Energy
NFE
$96.4M
| $983K | ﹤0.01% |
445,100
+69,500
| +19% | +$198K |
|
3060
ReNew
RNW
$2.2B
| $983K | ﹤0.01% |
127,779
+102,306
| +402% | +$778K |
|
3061
PUT
UroGen Pharma
URGN
$2.02B
| $983K | ﹤0.01% |
49,300
-147,100
| -75% | -$2.64M |
|
3062
Rayonier Advanced Materials
RYAM
$573M
| $982K | ﹤0.01% |
+136,031
| New | +$701K |
|
3063
Invesco S&P 500 Low Volatility ETF
SPLV
$7.21B
| $982K | ﹤0.01% |
13,377
+6,193
| +86% | +$453K |
|
3064
CALL
Braze
BRZE
$2.65B
| $981K | ﹤0.01% |
34,500
+600
| +2% | +$17K |
|
3065
CALL
Church & Dwight Co
CHD
$23.4B
| $981K | ﹤0.01% |
11,200
+10,700
| +2,140% | +$1M |
|
3066
CALL
EXL Service
EXLS
$4.36B
| $981K | ﹤0.01% |
22,300
-16,700
| -43% | -$723K |
|
3067
Babcock & Wilcox
BW
$1.4B
| $978K | ﹤0.01% |
337,277
+105,733
| +46% | +$187K |
|
3068
CALL
SouthState Bank Corp
SSB
$10.2B
| $978K | ﹤0.01% |
9,900
+4,700
| +90% | +$461K |
|
3069
PUT
Ezcorp Inc
EZPW
$1.87B
| $976K | ﹤0.01% |
51,300
+24,800
| +94% | +$389K |
|
3070
PUT
nVent Electric
NVT
$24.1B
| $976K | ﹤0.01% |
9,900
+6,800
| +219% | +$591K |
|
3071
CALL
Public Service Enterprise Group
PEG
$39.5B
| $976K | ﹤0.01% |
11,700
-65,500
| -85% | -$5.49M |
|
3072
CALL
Byrna Technologies
BYRN
$93.7M
| $975K | ﹤0.01% |
44,000
-1,700
| -4% | -$37.7K |
|
3073
Enviri
NVRI
$620M
| $974K | ﹤0.01% |
76,819
+47,424
| +161% | +$490K |
|
3074
CALL
Thor Industries
THO
$3.98B
| $974K | ﹤0.01% |
9,400
+600
| +7% | +$60.4K |
|
3075
CALL
Rush Enterprises Class A
RUSHA
$5.98B
| $973K | ﹤0.01% |
18,200
+16,900
| +1,300% | +$940K |
|
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.