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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
KBWD icon
9226
Invesco KBW High Dividend Yield Financial ETF
KBWD
$412M
– –
-284
Closed -$4K
KCE icon
9227
State Street SPDR S&P Capital Markets ETF
KCE
$483M
– –
-20
Closed -$1K
KELYA icon
9228
Kelly Services Class A
KELYA
$586M
– –
-784
Closed -$13K
KEUA
9229
DELISTED
KraneShares European Carbon Allowance Strategy ETF
KEUA
– –
-261
Closed -$8K
KFRC icon
9230
CALL
Kforce
KFRC
$977M
– –
-200
Closed -$12K
KWY
9231
Kingsway Corp
KWY
$299M
– –
-10,449
Closed -$85K
KIE icon
9232
State Street SPDR S&P Insurance ETF
KIE
$642M
– –
-103
Closed -$4K
NXDR
9233
Nextdoor Holdings
NXDR
$867M
$0 ﹤0.01%
+113
New +$280
NXDR
9234
PUT
Nextdoor Holdings
NXDR
$867M
– –
-20,600
Closed -$67K
KINS icon
9235
Kingstone Companies
KINS
$289M
$0 ﹤0.01%
+400
New +$590
KLIC icon
9236
Kulicke & Soffa
KLIC
$4.27B
– –
-1,171
Closed -$62.1K
KMDA icon
9237
CALL
Kamada
KMDA
$493M
– –
-300
Closed -$1K
KMPR icon
9238
CALL
Kemper
KMPR
$1.65B
– –
-400
Closed -$19K
KMPR icon
9239
Kemper
KMPR
$1.65B
– –
-17
Closed –
KNOP icon
9240
KNOT Offshore Partners
KNOP
$394M
– –
-1,882
Closed -$10.6K
KNOP icon
9241
PUT
KNOT Offshore Partners
KNOP
$394M
– –
-1,400
Closed -$6K
KNSL icon
9242
Kinsale Capital Group
KNSL
$8.5B
– –
-163
Closed -$63.3K
KNTK icon
9243
Kinetik
KNTK
$4.38B
– –
-2,806
Closed -$98K
KNTK icon
9244
PUT
Kinetik
KNTK
$4.38B
– –
-1,000
Closed -$35K
KOD icon
9245
Kodiak Sciences
KOD
$2.22B
$0 ﹤0.01%
202
-101,261
-100% -$357K
KOD icon
9246
PUT
Kodiak Sciences
KOD
$2.22B
– –
-900
Closed -$6K
KOP icon
9247
CALL
Koppers
KOP
$904M
– –
-1,200
Closed -$40K
KPLT icon
9248
CALL
Katapult Holdings
KPLT
$670M
– –
-856
Closed -$19K
KPLT icon
9249
Katapult Holdings
KPLT
$670M
– –
-316
Closed -$7K
KPLT icon
9250
PUT
Katapult Holdings
KPLT
$670M
– –
-132
Closed -$2K
368 369
370
371 372

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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.