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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
MKL icon
9201
Markel Group
MKL
$22.6B
– –
-5
Closed -$9.2K
MKL icon
9202
PUT
Markel Group
MKL
$22.6B
– –
-100
Closed -$172K
MLGO
9203
MicroAlgo
MLGO
$44M
– –
0
– –
MLKN icon
9204
CALL
MillerKnoll
MLKN
$1.58B
– –
-300
Closed -$6K
MLNK
9205
DELISTED
MeridianLink
MLNK
– –
-87
Closed -$1.68K
MLSS icon
9206
Milestone Scientific
MLSS
$41.6M
– –
-56
Closed -$61
MMI icon
9207
Marcus & Millichap
MMI
$1.21B
– –
-622
Closed -$23K
MMI icon
9208
PUT
Marcus & Millichap
MMI
$1.21B
– –
-1,000
Closed -$38K
MMLP icon
9209
Martin Midstream Partners
MMLP
$93.5M
– –
-13,746
Closed -$49.4K
MMSI icon
9210
CALL
Merit Medical Systems
MMSI
$5.35B
– –
-100
Closed -$9K
MNOV icon
9211
MediciNova
MNOV
$80.2M
$0 ﹤0.01%
16
-337
-95% -$596
MO icon
9212
Altria Group
MO
$115B
– –
-27,915
Closed -$1.52M
MODV
9213
CALL
DELISTED
ModivCare
MODV
– –
-200
Closed -$2K
MORN icon
9214
Morningstar
MORN
$7.86B
– –
-11
Closed -$3.46K
MORN icon
9215
PUT
Morningstar
MORN
$7.86B
– –
-100
Closed -$33K
MPAA icon
9216
Motorcar Parts of America
MPAA
$229M
– –
-171
Closed -$1.49K
MRAM icon
9217
CALL
Everspin Technologies
MRAM
$399M
– –
-2,100
Closed -$13K
MRC
9218
DELISTED
MRC Global
MRC
– –
-26
Closed -$336
MRCC
9219
DELISTED
Monroe Capital Corp
MRCC
$0 ﹤0.01%
29
-141
-83% -$1.18K
MRK icon
9220
Merck
MRK
$371B
– –
-41,291
Closed -$3.86M
MRSN
9221
PUT
DELISTED
Mersana Therapeutics
MRSN
– –
-4,976
Closed -$177K
MRUS
9222
DELISTED
Merus
MRUS
– –
-126
Closed -$5.49K
MRVL icon
9223
Marvell Technology
MRVL
$201B
– –
-5,375
Closed -$521K
MS icon
9224
Morgan Stanley
MS
$342B
– –
-11,472
Closed -$1.48M
MSA icon
9225
CALL
Mine Safety
MSA
$7.28B
– –
-4,800
Closed -$795K
367 368
369
370 371

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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.