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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
-4.08%
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
$127B
AUM Growth
+$5.5B
Cap. Flow
+$559M
Cap. Flow %
0.44%
Top 10 Hldgs %
44.01%
Holding
10,417
New
1,401
Increased
3,688
Reduced
3,363
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 Miscellaneous 98.25%
2 Technology 0.44%
3 Consumer Discretionary 0.32%
4 Healthcare 0.22%
5 Financials 0.17%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
YPF icon
10001
YPF Sociedad Anonima ADS
YPF
$20.6B
– –
-202
Closed -$2.85K
YRD
10002
CALL
Yiren Digital
YRD
$89.2M
– –
-1,800
Closed -$4K
YRD
10003
Yiren Digital
YRD
$89.2M
$0 ﹤0.01%
+12
New +$29
YQ
10004
17 Education & Technology Group
YQ
$28.3M
$0 ﹤0.01%
40
-81
-67% -$351
YUMC icon
10005
Yum China
YUMC
$14.8B
– –
-2,643
Closed -$148K
YYY icon
10006
Amplify CEF High Income ETF
YYY
$735M
– –
-278
Closed -$3K
Z icon
10007
Zillow
Z
$7.78B
– –
-49,961
Closed -$2.57M
ZD icon
10008
Ziff Davis
ZD
$1.91B
– –
-70
Closed -$4.8K
ZDGE icon
10009
Zedge
ZDGE
$38.9M
– –
-1,912
Closed -$4.01K
ZDGE icon
10010
PUT
Zedge
ZDGE
$38.9M
– –
-1,900
Closed -$4K
ZEUS
10011
CALL
DELISTED
Olympic Steel
ZEUS
– –
-200
Closed -$9K
ZETA icon
10012
Zeta Global
ZETA
$7.87B
– –
-3,766
Closed -$31.1K
ZGN icon
10013
Zegna
ZGN
$5.32B
– –
-405
Closed -$5K
ZKIN icon
10014
ZK International Group
ZKIN
– –
-28
Closed -$118
ZLAB icon
10015
CALL
Zai Lab
ZLAB
$2.94B
– –
-600
Closed -$16K
ZS icon
10016
Zscaler
ZS
$27.7B
– –
-9,856
Closed -$1.48M
ZVIA icon
10017
PUT
Zevia
ZVIA
$98.8M
– –
-600
Closed -$2K
ZVRA icon
10018
Zevra Therapeutics
ZVRA
$736M
– –
-12,694
Closed -$63.4K
LFWD icon
10019
ReWalk Robotics
LFWD
$19.8M
$0 ﹤0.01%
2
– –
ASTH icon
10020
PUT
Astrana Health
ASTH
$1.91B
– –
-600
Closed -$18K
BODI icon
10021
The Beachbody Company
BODI
$41.9M
$0 ﹤0.01%
39
-110
-74% -$2.21K
BODI icon
10022
PUT
The Beachbody Company
BODI
$41.9M
– –
-62
Closed -$1K
LENZ
10023
CALL
LENZ Therapeutics
LENZ
$187M
– –
-42,329
Closed -$770K
LENZ
10024
LENZ Therapeutics
LENZ
$187M
$0 ﹤0.01%
+27
New +$470
LENZ
10025
PUT
LENZ Therapeutics
LENZ
$187M
– –
-42,129
Closed -$766K
399 400
401
402 403

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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's Q3 2023 filing shows 1,401 new, 3,688 increased, 3,363 reduced and 1,719 closed positions. Its largest new stake was Amazon: 841,102 shares worth $107M. The largest sale was Netflix, an estimated $27.1M.

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

  • 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 1,401 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.