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Simplex Trading

Simplex Trading Portfolio holdings

AUM $171B
1-Year Est. Return 85%
 

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.

This Fund
S&P 500
This Quarter Est. Return
-4.36%
1 Year Est. Return
+85%
3 Year Est. Return
+183.25%
5 Year Est. Return
+145.21%
10 Year Est. Return
+1,056.84%
AUM
$156B
AUM Growth
-$22.4B
Cap. Flow
-$536M
Cap. Flow %
-0.34%
Top 10 Hldgs %
50.56%
Holding
10,070
New
1,566
Increased
3,139
Reduced
3,654
Closed
1,547

Top Buys

Rank Stock Value
1
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$272M
2
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$99M
3
NVDA icon
NVIDIA
NVDA
+$89.9M
4
TSM icon
TSMC
TSM
+$87.7M
5
AMZN icon
Amazon
AMZN
+$61M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$518M
2
MSTR icon
Strategy Inc
MSTR
+$81.2M
3
BABA icon
Alibaba
BABA
+$66.7M
4
AMD icon
Advanced Micro Devices
AMD
+$44.3M
5
UBER icon
Uber
UBER
+$41.3M

Sector Composition

Rank Sector Weight
1 Miscellaneous 98.56%
2 Technology 0.41%
3 Consumer Discretionary 0.22%
4 Healthcare 0.17%
5 Communication Services 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
IPO icon
9026
Renaissance IPO ETF
IPO
$152M
– –
-296
Closed -$12K
IRIX icon
9027
IRIDEX
IRIX
$12.2M
$0 ﹤0.01%
125
-380
-75% -$537
IRON icon
9028
PUT
Disc Medicine
IRON
$3.04B
– –
-200
Closed -$12K
IRTC icon
9029
iRhythm Holdings
IRTC
$4.06B
– –
-7,139
Closed -$756K
IRWD icon
9030
CALL
Ironwood Pharmaceuticals
IRWD
$704M
– –
-900
Closed -$3K
IRWD icon
9031
PUT
Ironwood Pharmaceuticals
IRWD
$704M
– –
-1,200
Closed -$5K
ISPR icon
9032
PUT
Ispire Technology
ISPR
$88.4M
– –
-200
Closed -$1K
ITOS
9033
DELISTED
iTeos Therapeutics
ITOS
– –
-6,070
Closed -$44.6K
ITP icon
9034
CALL
IT Tech Packaging
ITP
$2.74M
– –
-2,000
Closed -$1K
ITP icon
9035
IT Tech Packaging
ITP
$2.74M
$0 ﹤0.01%
2,079
-1,196
-37% -$438
ITT icon
9036
ITT
ITT
$18.3B
– –
-1,604
Closed -$228K
IUSV icon
9037
iShares Core S&P US Value ETF
IUSV
$27.9B
– –
-48
Closed -$4K
IVVD icon
9038
Invivyd
IVVD
$243M
– –
-4,362
Closed -$3.91K
IVW icon
9039
iShares S&P 500 Growth ETF
IVW
$77.2B
$0 ﹤0.01%
+1
New +$101
IWD icon
9040
iShares Russell 1000 Value ETF
IWD
$84.1B
– –
-3,040
Closed -$562K
IWN icon
9041
iShares Russell 2000 Value ETF
IWN
$14.6B
– –
-5,238
Closed -$859K
IWO icon
9042
iShares Russell 2000 Growth ETF
IWO
$14.7B
– –
-572
Closed -$164K
IWV icon
9043
iShares Russell 3000 ETF
IWV
$20.5B
– –
-250
Closed -$83K
IXC icon
9044
iShares Global Energy ETF
IXC
$2.86B
– –
-82
Closed -$3K
IXJ icon
9045
iShares Global Healthcare ETF
IXJ
$4.31B
$0 ﹤0.01%
5
-139
-97% -$12.6K
IXN icon
9046
iShares Global Tech ETF
IXN
$9.68B
– –
-303
Closed -$25K
IYC icon
9047
iShares US Consumer Discretionary ETF
IYC
$1.18B
– –
-99
Closed -$9K
IYE icon
9048
iShares US Energy ETF
IYE
$1.87B
– –
-100
Closed -$4K
IYT icon
9049
iShares US Transportation ETF
IYT
$2.17B
– –
-11,066
Closed -$747K
J icon
9050
Jacobs Solutions
J
$17.1B
– –
-2,649
Closed -$341K
360 361
362
363 364

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Simplex Trading's Q1 2025 Portfolio in Review

As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.

Simplex Trading's Q1 2025 filing shows 1,566 new, 3,139 increased, 3,654 reduced and 1,547 closed positions. Its largest new stake was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M. The largest sale was Apple, an estimated $518M.

By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.

  • Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
  • Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
  • Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
  • Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
  • Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
  • Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
  • Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.

Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.