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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
RVTY icon
9501
PUT
Revvity
RVTY
$14.5B
– –
-100
Closed -$11K
RWAY icon
9502
CALL
Runway Growth Finance
RWAY
$279M
– –
-300
Closed -$3K
RWAY icon
9503
Runway Growth Finance
RWAY
$279M
– –
-6,918
Closed -$77.5K
RWM icon
9504
ProShares Short Russell2000
RWM
$131M
– –
-3,165
Closed -$59K
RXST icon
9505
RxSight
RXST
$265M
– –
-34,730
Closed -$1.03M
RYZ
9506
Ryerson Holding Corp
RYZ
$1.37B
– –
-423
Closed -$7K
RYZ
9507
PUT
Ryerson Holding Corp
RYZ
$1.37B
– –
-700
Closed -$12K
RYAN icon
9508
PUT
Ryan Specialty Holdings
RYAN
$5.12B
– –
-4,300
Closed -$275K
RYTM icon
9509
Rhythm Pharmaceuticals
RYTM
$7.07B
– –
-2,475
Closed -$137K
RZLT icon
9510
Rezolute
RZLT
$441M
$0 ﹤0.01%
32
-1,613
-98% -$7.02K
SACH
9511
CALL
Sachem Capital Corp
SACH
$42.9M
– –
-5,200
Closed -$7K
SACH
9512
PUT
Sachem Capital Corp
SACH
$42.9M
– –
-1,100
Closed -$1K
SAFT icon
9513
CALL
Safety Insurance
SAFT
$1.51B
– –
-200
Closed -$16K
SAFE
9514
Safehold
SAFE
$1.07B
– –
-1,997
Closed -$35.1K
SAH icon
9515
Sonic Automotive
SAH
$2.56B
$0 ﹤0.01%
+15
New +$1.01K
SAM icon
9516
Boston Beer
SAM
$1.74B
– –
-413
Closed -$101K
SAND
9517
DELISTED
Sandstorm Gold
SAND
– –
-96,015
Closed -$600K
SANM icon
9518
CALL
Sanmina
SANM
$10.6B
– –
-100
Closed -$7K
SATL icon
9519
Satellogic
SATL
$713M
– –
-13,119
Closed -$44.1K
SB icon
9520
PUT
Safe Bulkers
SB
$934M
– –
-14,000
Closed -$49K
EDVA
9521
Endovia Health Sciences, Inc.
EDVA
$1.83M
– –
-71
Closed -$1K
SBRA icon
9522
Sabra Healthcare REIT
SBRA
$5.31B
– –
-2,839
Closed -$47.9K
SBS icon
9523
PUT
Sabesp
SBS
$18.1B
– –
-5,157
Closed -$14K
SBUX icon
9524
Starbucks
SBUX
$119B
– –
-359,550
Closed -$37.2M
SCHA icon
9525
Schwab U.S Small- Cap ETF
SCHA
$22.9B
$0 ﹤0.01%
+27
New +$688
379 380
381
382 383

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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.