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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
+6.46%
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
$122B
AUM Growth
+$7.84B
Cap. Flow
-$3.39B
Cap. Flow %
-2.78%
Top 10 Hldgs %
42.57%
Holding
10,535
New
1,474
Increased
3,350
Reduced
3,913
Closed
1,517

Top Buys

Rank Stock Value
1
MSFT icon
Microsoft
MSFT
+$53.9M
2
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$52.9M
3
NVDA icon
NVIDIA
NVDA
+$47.1M
4
PYPL icon
PayPal
PYPL
+$41.7M
5
GOOG icon
Alphabet (Google) Class C
GOOG
+$28.4M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$51.4M
2
WMT icon
Walmart Inc
WMT
+$46.4M
3
OIH icon
VanEck Oil Services ETF
OIH
+$34.2M
4
ADBE icon
Adobe
ADBE
+$33.5M
5
SBUX icon
Starbucks
SBUX
+$26.8M

Sector Composition

Rank Sector Weight
1 Technology 0.41%
2 Healthcare 0.21%
3 Consumer Discretionary 0.21%
4 Communication Services 0.2%
5 Financials 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
TRX icon
9951
CALL
TRX Gold Corp
TRX
$279M
– –
-2,700
Closed -$1K
TRX icon
9952
TRX Gold Corp
TRX
$279M
– –
-100
Closed -$50
TS icon
9953
Tenaris
TS
$29.4B
– –
-47,270
Closed -$1.31M
TSE
9954
DELISTED
Trinseo
TSE
– –
-36,737
Closed -$593K
TSLX icon
9955
Sixth Street Specialty
TSLX
$1.59B
– –
-3,578
Closed -$65.2K
TSN icon
9956
Tyson Foods
TSN
$20.1B
– –
-85,992
Closed -$4.68M
TTEC icon
9957
CALL
TTEC Holdings
TTEC
$95.9M
– –
-300
Closed -$11K
TTGT icon
9958
CALL
TechTarget
TTGT
$260M
– –
-2,300
Closed -$83K
TTWO icon
9959
Take-Two Interactive
TTWO
$43.4B
– –
-57,207
Closed -$7.48M
TURN
9960
DELISTED
180 Degree Capital
TURN
– –
-113
Closed -$529
TUSK icon
9961
Mammoth Energy Services
TUSK
$137M
– –
-5,024
Closed -$20.8K
TUYA
9962
CALL
Tuya Inc
TUYA
$1.07B
– –
-41,100
Closed -$77K
TUYA
9963
Tuya Inc
TUYA
$1.07B
$0 ﹤0.01%
+84
New +$161
TVTX icon
9964
Travere Therapeutics
TVTX
$5.23B
– –
-4,793
Closed -$87.2K
TWM icon
9965
ProShares UltraShort Russell2000
TWM
$42.4M
– –
-4,270
Closed -$330K
TYL icon
9966
Tyler Technologies
TYL
$11.7B
– –
-287
Closed -$111K
TYRA icon
9967
CALL
Tyra Biosciences
TYRA
$1.82B
– –
-200
Closed -$3K
TZOO icon
9968
Travelzoo
TZOO
$105M
– –
-2
Closed -$16
UAA icon
9969
Under Armour
UAA
$3.1B
– –
-145,670
Closed -$1.38M
UAMY icon
9970
United States Antimony
UAMY
$865M
$0 ﹤0.01%
2,700
+2,500
+1,250% +$860
UBX
9971
DELISTED
Unity Biotechnology
UBX
– –
-4,517
Closed -$11.9K
UBT icon
9972
ProShares Ultra 20+ Year Treasury
UBT
$58.4M
– –
-170
Closed -$4K
UDR icon
9973
CALL
UDR
UDR
$12.8B
– –
-2,200
Closed -$90K
UEIC icon
9974
CALL
Universal Electronics
UEIC
$57.7M
– –
-27,300
Closed -$276K
UFCS icon
9975
United Fire Group
UFCS
$1.27B
– –
-19
Closed –
397 398
399
400 401

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Simplex Trading's Q2 2023 Portfolio in Review

As of Q2 2023, Simplex Trading held 10,535 positions worth $122B, up 6.9% from $114B the previous quarter. Its ten largest holdings account for 43% of the portfolio.

Simplex Trading's Q2 2023 filing shows 1,474 new, 3,350 increased, 3,913 reduced and 1,517 closed positions. Its largest new stake was Microsoft: 171,935 shares worth $58.5M. The largest sale was Apple, an estimated $51.4M.

By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.42% a quarter earlier, followed by Healthcare and Consumer Discretionary.

  • Simplex Trading's largest Q2 2023 buy was Microsoft: 171,935 shares worth $58.5M.
  • Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q2 2023, an estimated $52.9M increase.
  • Simplex Trading's biggest Q2 2023 reduction was Adobe, cutting an estimated $33.5M.
  • Simplex Trading fully exited Apple in Q2 2023, selling an estimated $51.4M.
  • Simplex Trading's ten largest holdings make up 43% of its $122B portfolio in Q2 2023.
  • Simplex Trading opened 1,474 new positions and closed 1,517 in Q2 2023.
  • Simplex Trading's portfolio value rose 6.9% quarter-over-quarter to $122B.

Based on Simplex Trading's 13F filing for Q2 2023, filed 4 Aug 2023.