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Simplex Trading

Simplex Trading Portfolio holdings

AUM $184B Turnover 28.44%
1-Year Est. Return 51.71%
 

Simplex Trading is a market maker that trades for its own account, mainly in US stock options and options on futures, using software it builds itself. Its work pairs software developers with data-driven traders. It was founded in Chicago in 2004, and Erik Swanson, who joined straight out of college as a trader, has been its chief executive since 2014. It also invests in early-stage financial and technology start-ups.

This Fund
S&P 500
This Quarter Est. Return
-0.22%
1 Year Est. Return
+51.71%
3 Year Est. Return
+194.66%
5 Year Est. Return
+164.83%
10 Year Est. Return
+968.67%
AUM
$184B
AUM Growth
+$13.3B
Cap. Flow
-$519M
Cap. Flow %
-0.28%
Top 10 Hldgs %
50.68%
Holding
10,644
New
1,493
Increased
3,697
Reduced
3,633
Closed
1,534
Avg Time Held Equity + Options
3 years
Top 10 Avg Time Held Equity + Options
3.9 years
Top 20 Avg Time Held Equity + Options
4.3 years
Avg Time Held Equity only
0.5 years
Top 10 Avg Time Held Equity only
0.5 years
Top 20 Avg Time Held Equity only
0.4 years

Top Buys

Rank Stock Value
1
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$92.6M
2
HYG icon
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
+$80.6M
3
AMZN icon
Amazon
AMZN
+$26.3M
4
XLI icon
State Street Industrial Select Sector SPDR ETF
XLI
+$25.7M
5
GLD icon
SPDR Gold Trust
GLD
+$20.7M

Top Sells

Rank Stock Value
1
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$128M
2
NVDA icon
NVIDIA
NVDA
+$97.8M
3
TSLA icon
Tesla
TSLA
+$53.9M
4
MU icon
Micron Technology
MU
+$50M
5
USO icon
United States Oil Fund
USO
+$49.2M

Sector Composition

Rank Sector Weight
1 Miscellaneous 98.84%
2 Technology 0.45%
3 Consumer Discretionary 0.14%
4 Healthcare 0.14%
5 Financials 0.1%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow Held Since
UMAC icon
1551
CALL
Unusual Machines
UMAC
$657M
$3.14M ﹤0.01%
128,300
+12,800
+11% +$297K
2025 Q1
6 quarters
KBH icon
1552
PUT
KB Home
KBH
$3.04B
$3.14M ﹤0.01%
67,500
-3,300
-5% -$178K
2014 Q4
47 quarters
Q icon
1553
CALL
Qnity Electronics Inc
Q
$26.5B
$3.13M ﹤0.01%
24,900
+7,000
+39% +$916K
2025 Q4
3 quarters
IFF icon
1554
PUT
International Flavors & Fragrances
IFF
$20.7B
$3.13M ﹤0.01%
37,500
-5,700
-13% -$470K
2026 Q1
2 quarters
DGXX icon
1555
CALL
Digi Power X Inc
DGXX
$231M
$3.13M ﹤0.01%
763,400
+210,600
+38% +$843K
2025 Q4
3 quarters
ALL icon
1556
CALL
Allstate
ALL
$64.9B
$3.13M ﹤0.01%
14,100
+2,100
+18% +$533K
2015 Q1
46 quarters
FE icon
1557
PUT
FirstEnergy
FE
$26.9B
$3.12M ﹤0.01%
72,100
-6,000
-8% -$282K
2014 Q4
47 quarters
NSC icon
1558
CALL
Norfolk Southern
NSC
$74.3B
$3.12M ﹤0.01%
10,100
+8,200
+432% +$2.72M
2014 Q4
47 quarters
GPN icon
1559
Global Payments
GPN
$26.5B
$3.11M ﹤0.01%
38,106
-644
-2% -$55.2K
2026 Q1
2 quarters
CARR icon
1560
CALL
Carrier Global
CARR
$44.7B
$3.11M ﹤0.01%
56,700
+2,200
+4% +$136K
2021 Q1
22 quarters
ISRG icon
1561
Intuitive Surgical
ISRG
$156B
$3.11M ﹤0.01%
7,646
+1,560
+26% +$595K
2026 Q2
1 quarter
PAA icon
1562
PUT
Plains All American Pipeline
PAA
$17.1B
$3.11M ﹤0.01%
131,000
-34,900
-21% -$850K
2014 Q4
47 quarters
MNDY icon
1563
PUT
monday.com
MNDY
$3.28B
$3.11M ﹤0.01%
39,600
+1,700
+4% +$147K
2021 Q2
21 quarters
SIL icon
1564
Global X Silver Miners ETF NEW
SIL
$3.9B
$3.11M ﹤0.01%
36,111
-21,682
-38% -$1.89M
2025 Q4
3 quarters
SHAK icon
1565
CALL
Shake Shack
SHAK
$3.03B
$3.1M ﹤0.01%
52,900
+25,000
+90% +$1.59M
2021 Q1
22 quarters
TSLY icon
1566
PUT
YieldMax TSLA Option Income Strategy ETF
TSLY
$625M
$3.1M ﹤0.01%
161,900
+29,800
+23% +$689K
2025 Q4
3 quarters
UEC icon
1567
CALL
Uranium Energy
UEC
$3.58B
$3.1M ﹤0.01%
327,900
-73,200
-18% -$779K
2018 Q2
33 quarters
PGY icon
1568
PUT
Pagaya Technologies
PGY
$1.45B
$3.1M ﹤0.01%
178,900
-290,500
-62% -$5.74M
2022 Q3
16 quarters
KVYO icon
1569
CALL
Klaviyo
KVYO
$5.98B
$3.1M ﹤0.01%
196,900
+68,500
+53% +$1.2M
2023 Q3
12 quarters
DVA icon
1570
CALL
DaVita
DVA
$11.5B
$3.1M ﹤0.01%
17,700
+14,800
+510% +$2.97M
2014 Q4
47 quarters
FMC icon
1571
CALL
FMC
FMC
$879M
$3.1M ﹤0.01%
347,000
-28,500
-8% -$312K
2016 Q1
42 quarters
UNIT icon
1572
PUT
Uniti Group
UNIT
$988M
$3.09M ﹤0.01%
369,000
-500
-0.1% -$5.03K
2015 Q2
45 quarters
VGK icon
1573
CALL
Vanguard FTSE Europe ETF
VGK
$30.2B
$3.09M ﹤0.01%
33,600
-43,100
-56% -$3.88M
2026 Q1
2 quarters
AXSM icon
1574
Axsome Therapeutics
AXSM
$7.85B
$3.09M ﹤0.01%
16,755
-2,888
-15% -$628K
2026 Q2
1 quarter
GRPN icon
1575
CALL
Groupon
GRPN
$521M
$3.08M ﹤0.01%
156,100
+80,300
+106% +$1.83M
2015 Q3
44 quarters
61 62
63
64 65

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Simplex Trading's Q3 2026 Portfolio in Review

As of Q3 2026, Simplex Trading held 10,644 positions worth $184B, up 7.8% from $171B the previous quarter. Its ten largest holdings account for 51% of the portfolio.

Simplex Trading's Q3 2026 filing shows 1,493 new, 3,697 increased, 3,633 reduced and 1,534 closed positions. Its largest new stake was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M. The largest sale was Alphabet (Google) Class A, an estimated $128M.

By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.

  • Simplex Trading's largest Q3 2026 buy was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M.
  • Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q3 2026, an estimated $92.6M increase.
  • Simplex Trading's biggest Q3 2026 reduction was NVIDIA, cutting an estimated $97.8M.
  • Simplex Trading fully exited Alphabet (Google) Class A in Q3 2026, selling an estimated $128M.
  • Simplex Trading's ten largest holdings make up 51% of its $184B portfolio in Q3 2026.
  • Simplex Trading opened 1,493 new positions and closed 1,534 in Q3 2026.
  • Simplex Trading's portfolio value rose 7.8% quarter-over-quarter to $184B.

Based on Simplex Trading's 13F filing for Q3 2026, filed 4 Nov 2026.