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 | |
|---|---|---|---|---|---|---|
2926
Compass Minerals
CMP
$1.25B
| $1.14M | ﹤0.01% |
59,597
-799
| -1% | -$15.9K |
|
2927
Madison Square Garden
MSGS
$9.54B
| $1.14M | ﹤0.01% |
5,034
+3,128
| +164% | +$641K |
|
2928
CALL
Dana Inc
DAN
$2.94B
| $1.14M | ﹤0.01% |
56,900
-192,500
| -77% | -$3.57M |
|
|
CWAN
2929
PUT
DELISTED
Clearwater Analytics
CWAN
| $1.14M | ﹤0.01% |
63,100
-2,800
| -4% | -$56.8K |
|
|
IVES
2930
Dan IVES Wedbush AI Revolution ETF
IVES
$975M
| $1.14M | ﹤0.01% |
+35,404
| New | +$1.02M |
|
2931
CALL
Zai Lab
ZLAB
$2.12B
| $1.14M | ﹤0.01% |
33,500
+14,300
| +74% | +$492K |
|
2932
PUT
Appian
APPN
$1.91B
| $1.13M | ﹤0.01% |
37,100
+25,400
| +217% | +$763K |
|
2933
PUT
Nuvation Bio
NUVB
$2.29B
| $1.13M | ﹤0.01% |
+306,700
| New | +$836K |
|
2934
CALL
Aramark
ARMK
$15.2B
| $1.13M | ﹤0.01% |
29,500
-7,800
| -21% | -$316K |
|
2935
Academy Sports + Outdoors
ASO
$3.09B
| $1.13M | ﹤0.01% |
22,614
+1,137
| +5% | +$58K |
|
2936
PUT
Service Corp International
SCI
$11.5B
| $1.13M | ﹤0.01% |
13,600
+5,600
| +70% | +$447K |
|
2937
Joby Aviation
JOBY
$7.22B
| $1.13M | ﹤0.01% |
69,970
-26,666
| -28% | -$405K |
|
2938
PUT
Weatherford International
WFRD
$6.2B
| $1.13M | ﹤0.01% |
16,500
+12,900
| +358% | +$766K |
|
2939
Ryder
R
$10.3B
| $1.13M | ﹤0.01% |
5,982
+2,278
| +62% | +$411K |
|
2940
CALL
Semtech
SMTC
$11.3B
| $1.13M | ﹤0.01% |
15,800
-57,200
| -78% | -$3.11M |
|
2941
PUT
Churchill Downs
CHDN
$6.14B
| $1.13M | ﹤0.01% |
11,600
+600
| +5% | +$61.7K |
|
|
SMLR
2942
DELISTED
Semler Scientific
SMLR
| $1.13M | ﹤0.01% |
37,506
-20,488
| -35% | -$705K |
|
|
ETHW
2943
CALL
Bitwise Ethereum ETF
ETHW
$204M
| $1.12M | ﹤0.01% |
37,700
+15,000
| +66% | +$422K |
|
2944
PUT
Halozyme
HALO
$9.7B
| $1.12M | ﹤0.01% |
15,300
+200
| +1% | +$13.3K |
|
2945
CALL
Hyatt Hotels
H
$18B
| $1.12M | ﹤0.01% |
7,900
-6,500
| -45% | -$932K |
|
2946
CALL
Sensata Technologies
ST
$6.73B
| $1.12M | ﹤0.01% |
36,700
-1,100
| -3% | -$34.8K |
|
2947
PUT
H.B. Fuller
FUL
$3.03B
| $1.12M | ﹤0.01% |
+18,900
| New | +$1.14M |
|
2948
PUT
Alcon
ALC
$33B
| $1.12M | ﹤0.01% |
15,000
-16,200
| -52% | -$1.35M |
|
2949
CALL
Glaukos
GKOS
$8.85B
| $1.12M | ﹤0.01% |
13,700
+3,800
| +38% | +$349K |
|
2950
CALL
Microvast
MVST
$266M
| $1.12M | ﹤0.01% |
290,300
-140,300
| -33% | -$438K |
|
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.