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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
RCL icon
1526
Royal Caribbean
RCL
$89.7B
$3.22M ﹤0.01%
12,120
+2,452
+25% +$696K
2026 Q2
1 quarter
TRMB icon
1527
CALL
Trimble
TRMB
$12.9B
$3.22M ﹤0.01%
56,400
+17,700
+46% +$1.01M
2016 Q4
39 quarters
NBIX icon
1528
CALL
Neurocrine Biosciences
NBIX
$17.7B
$3.22M ﹤0.01%
22,700
+20,600
+981% +$3.31M
2014 Q4
47 quarters
OKLO icon
1529
Oklo
OKLO
$5.05B
$3.22M ﹤0.01%
86,935
-16,097
-16% -$680K
2026 Q2
1 quarter
MP icon
1530
MP Materials
MP
$6.55B
$3.22M ﹤0.01%
+68,006
New +$3.45M
2026 Q3
0 quarters
TFPM icon
1531
PUT
Triple Flag Precious Metals
TFPM
$6.45B
$3.21M ﹤0.01%
104,200
+98,700
+1,795% +$3.09M
2024 Q4
7 quarters
XEL icon
1532
CALL
Xcel Energy
XEL
$52.1B
$3.21M ﹤0.01%
45,500
+24,400
+116% +$1.88M
2018 Q2
33 quarters
LSCC icon
1533
CALL
Lattice Semiconductor
LSCC
$17.5B
$3.2M ﹤0.01%
25,500
+13,600
+114% +$1.68M
2018 Q2
33 quarters
CMI icon
1534
CALL
Cummins
CMI
$63.5B
$3.2M ﹤0.01%
6,200
-8,100
-57% -$4.89M
2014 Q4
47 quarters
SRPT icon
1535
CALL
Sarepta Therapeutics
SRPT
$1.79B
$3.2M ﹤0.01%
175,500
-11,800
-6% -$221K
2021 Q2
21 quarters
GENI icon
1536
CALL
Genius Sports
GENI
$1.71B
$3.19M ﹤0.01%
556,800
+3,600
+0.7% +$25.2K
2021 Q2
21 quarters
SBAC icon
1537
SBA Communications
SBAC
$19.8B
$3.19M ﹤0.01%
19,919
+18,964
+1,986% +$3.44M
2026 Q1
2 quarters
FUBO icon
1538
PUT
FuboTV Inc
FUBO
$238M
$3.19M ﹤0.01%
355,600
-96,200
-21% -$958K
2020 Q4
23 quarters
ARE icon
1539
PUT
Alexandria Real Estate Equities
ARE
$7.85B
$3.18M ﹤0.01%
67,000
+19,400
+41% +$985K
2026 Q1
2 quarters
ROP icon
1540
CALL
Roper Technologies
ROP
$47.3B
$3.18M ﹤0.01%
9,100
-7,200
-44% -$2.76M
2020 Q4
23 quarters
ILMN icon
1541
PUT
Illumina
ILMN
$32.2B
$3.17M ﹤0.01%
11,600
+6,200
+115% +$1.3M
2014 Q4
47 quarters
ALGN icon
1542
Align Technology
ALGN
$12.1B
$3.17M ﹤0.01%
21,827
+5,473
+33% +$905K
2025 Q1
6 quarters
XLP icon
1543
State Street Consumer Staples Select Sector SPDR ETF
XLP
$15.1B
$3.17M ﹤0.01%
39,286
-15,314
-28% -$1.29M
2026 Q2
1 quarter
CRM icon
1544
Salesforce
CRM
$179B
$3.17M ﹤0.01%
13,787
-12,394
-47% -$2.56M
2026 Q2
1 quarter
TVTX icon
1545
CALL
Travere Therapeutics
TVTX
$5B
$3.16M ﹤0.01%
53,700
+23,500
+78% +$1.43M
2020 Q3
24 quarters
VG icon
1546
Venture Global Inc
VG
$31.7B
$3.16M ﹤0.01%
250,050
+77,656
+45% +$1.06M
2026 Q2
1 quarter
NVMI icon
1547
CALL
Nova
NVMI
$10.8B
$3.16M ﹤0.01%
8,200
+7,800
+1,950% +$3.11M
2020 Q2
25 quarters
GBTC icon
1548
PUT
Grayscale Bitcoin Trust
GBTC
$11.2B
$3.16M ﹤0.01%
48,900
+13,300
+37% +$733K
2024 Q4
7 quarters
XIFR icon
1549
PUT
XPLR Infrastructure LP
XIFR
$694M
$3.16M ﹤0.01%
301,400
+201,700
+202% +$2.35M
2016 Q2
41 quarters
PFE icon
1550
Pfizer
PFE
$168B
$3.15M ﹤0.01%
110,427
-530,550
-83% -$14.1M
2022 Q3
16 quarters
60 61
62
63 64

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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.