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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
-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
KPTI icon
9251
PUT
Karyopharm Therapeutics
KPTI
$169M
– –
-267
Closed -$7K
KRC icon
9252
Kilroy Realty
KRC
$4.57B
– –
-2,197
Closed -$76.2K
KRG icon
9253
PUT
Kite Realty
KRG
$5.95B
– –
-600
Closed -$13K
KRMD icon
9254
CALL
KORU Medical Systems
KRMD
$175M
– –
-1,800
Closed -$6K
KRON
9255
CALL
DELISTED
Kronos Bio
KRON
– –
-10,700
Closed -$18K
KRP icon
9256
Kimbell Royalty Partners
KRP
$1.48B
– –
-11,634
Closed -$176K
KSS icon
9257
Kohl's
KSS
$2.09B
– –
-39,268
Closed -$991K
KTEC icon
9258
KraneShares Hang Seng TECH Index ETF
KTEC
$56.4M
– –
-950
Closed -$11K
KULR icon
9259
CALL
KULR Technology Group
KULR
$118M
– –
-6,825
Closed -$34K
KULR icon
9260
KULR Technology Group
KULR
$118M
$0 ﹤0.01%
+96
New +$547
KVHI icon
9261
KVH Industries
KVHI
$178M
– –
-608
Closed -$5K
KYN icon
9262
CALL
Kayne Anderson Energy Infrastructure Fund
KYN
$2.54B
– –
-2,500
Closed -$20K
LAB icon
9263
PUT
Standard BioTools
LAB
$331M
– –
-1,000
Closed -$1K
MZTI
9264
PUT
The Marzetti Company
MZTI
$2.93B
– –
-100
Closed -$20K
LAW icon
9265
CS Disco
LAW
$234M
– –
-544
Closed -$4.74K
LAZ icon
9266
Lazard
LAZ
$4.38B
– –
-7,052
Closed -$236K
LBRDK icon
9267
Liberty Broadband Class C
LBRDK
$4.05B
– –
-944
Closed -$84.2K
LBTYK icon
9268
Liberty Global Class C
LBTYK
$3.21B
$0 ﹤0.01%
39
-1,704
-98% -$32.8K
LCID icon
9269
Lucid Motors
LCID
$2.49B
– –
-388
Closed -$25.1K
LDTC
9270
DELISTED
LeddarTech
LDTC
– –
-2
Closed -$11
LDTC
9271
PUT
DELISTED
LeddarTech
LDTC
– –
-600
Closed -$3K
LE icon
9272
Lands' End
LE
$362M
– –
-2,928
Closed -$24.9K
LESL icon
9273
Leslie's
LESL
$12.7M
$0 ﹤0.01%
7
-208
-97% -$27.2K
LEU icon
9274
Centrus Energy
LEU
$3.33B
– –
-5,523
Closed -$238K
LFMD icon
9275
LifeMD
LFMD
$185M
– –
-2,190
Closed -$9.49K
369 370
371
372 373

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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 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.