We are live on ! Find out more
Simplex Trading

Simplex Trading Portfolio holdings

AUM $149B
1-Year Est. Return 62.07%
 

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
-4.08%
1 Year Est. Return
+62.07%
3 Year Est. Return
+116.86%
5 Year Est. Return
+116.02%
10 Year Est. Return
+774.44%
AUM
$127B
AUM Growth
+$5.5B
Cap. Flow
+$11.9B
Cap. Flow %
9.37%
Top 10 Hldgs %
44.01%
Holding
10,417
New
1,399
Increased
3,690
Reduced
3,364
Closed
1,719

Top Buys

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$113M
2
GLD icon
SPDR Gold Trust
GLD
+$68.6M
3
NVDA icon
NVIDIA
NVDA
+$63.4M
4
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$55.2M
5
AAPL icon
Apple
AAPL
+$54.9M

Top Sells

Rank Stock Value
1
NFLX icon
Netflix
NFLX
+$27.1M
2
QCOM icon
Qualcomm
QCOM
+$24.6M
3
DIS icon
Walt Disney
DIS
+$21.2M
4
AMD icon
Advanced Micro Devices
AMD
+$18.2M
5
SNOW icon
Snowflake
SNOW
+$16.1M

Sector Composition

Rank Sector Weight
1 Technology 0.44%
2 Consumer Discretionary 0.32%
3 Healthcare 0.22%
4 Financials 0.17%
5 Communication Services 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
MGTX icon
9351
MeiraGTx Holdings
MGTX
$1.12B
– –
-8,912
Closed -$54.1K
MGTX icon
9352
PUT
MeiraGTx Holdings
MGTX
$1.12B
– –
-8,700
Closed -$58K
KG
9353
Kestrel Group
KG
$71.3M
– –
-810
Closed -$34K
MHO icon
9354
M/I Homes
MHO
$3.76B
– –
-610
Closed -$56.4K
MIDU icon
9355
Direxion Daily Mid Cap Bull 3X ETF
MIDU
$72.8M
– –
-182
Closed -$7K
MIND icon
9356
MIND Technology
MIND
$50M
$0 ﹤0.01%
+82
New +$508
MIST icon
9357
Milestone Pharmaceuticals
MIST
$149M
– –
-3,588
Closed -$11.2K
MIRM icon
9358
Mirum Pharmaceuticals
MIRM
$6.97B
– –
-1,674
Closed -$45.8K
MLNK
9359
DELISTED
MeridianLink
MLNK
– –
-50
Closed -$1K
MLNK
9360
PUT
DELISTED
MeridianLink
MLNK
– –
-3,600
Closed -$74K
MLSS icon
9361
Milestone Scientific
MLSS
$35.6M
$0 ﹤0.01%
91
-397
-81% -$418
MLSS icon
9362
PUT
Milestone Scientific
MLSS
$35.6M
– –
-2,000
Closed -$1K
MRSH
9363
Marsh
MRSH
$84.2B
– –
-8,529
Closed -$1.63M
MMI icon
9364
Marcus & Millichap
MMI
$1.13B
– –
-200
Closed -$6K
MMI icon
9365
PUT
Marcus & Millichap
MMI
$1.13B
– –
-300
Closed -$9K
MMLP icon
9366
CALL
Martin Midstream Partners
MMLP
$95.5M
– –
-1,700
Closed -$3K
MMS icon
9367
PUT
Maximus
MMS
$3.02B
– –
-100
Closed -$8K
MNTS icon
9368
CALL
Momentus
MNTS
$92.1M
– –
-1
Closed -$4K
MODV
9369
DELISTED
ModivCare
MODV
– –
-261
Closed -$10.2K
MORN icon
9370
PUT
Morningstar
MORN
$6.37B
– –
-100
Closed -$19K
MPAA icon
9371
Motorcar Parts of America
MPAA
$256M
– –
-928
Closed -$7.67K
MPAA icon
9372
PUT
Motorcar Parts of America
MPAA
$256M
– –
-2,600
Closed -$20K
MPC icon
9373
Marathon Petroleum
MPC
$91.2B
– –
-14,431
Closed -$2.01M
MPLX icon
9374
MPLX
MPLX
$58.4B
– –
-35,552
Closed -$1.24M
MRC
9375
DELISTED
MRC Global
MRC
– –
-2,470
Closed -$24.8K
373 374
375
376 377

Similar funds

Mitsubishi UFJ Asset Management
Mitsubishi UFJ Asset Management Tokyo, Japan $149B AUM 24.71% 1-Year Est. Return
Creative Planning
Creative Planning Overland Park, Kansas $147B AUM 18.73% 1-Year Est. Return
Jennison Associates
Jennison Associates New York $145B AUM 34.61% 1-Year Est. Return
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return
Sumitomo Mitsui Trust Group
Sumitomo Mitsui Trust Group Minato-Ku, Tokyo, Japan $154B AUM 29.96% 1-Year Est. Return
Canada Pension Plan Investment Board
Canada Pension Plan Investment Board Toronto Ontario, Ontario, Canada $155B AUM 29.93% 1-Year Est. Return
Victory Capital Management
Victory Capital Management San Antonio, Texas $156B AUM 27.51% 1-Year Est. Return
First Trust Advisors
First Trust Advisors Wheaton, Illinois $140B AUM 27.84% 1-Year Est. Return

Simplex Trading's Q3 2023 Portfolio in Review

As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.

Simplex Trading deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.

By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.

On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.

  • Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
  • Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
  • Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
  • Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
  • Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
  • Simplex Trading opened 1,399 new positions and closed 1,719 in Q3 2023.
  • Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.

Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.