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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
TMUS icon
351
CALL
T-Mobile US
TMUS
$179B
$31.2M 0.02%
191,600
+20,000
+12% +$3.58M
2021 Q2
21 quarters
TJX icon
352
CALL
TJX Companies
TJX
$150B
$31.1M 0.02%
234,900
+148,400
+172% +$21.4M
2014 Q4
47 quarters
ZM icon
353
CALL
Zoom
ZM
$26.6B
$30.8M 0.02%
338,800
+52,100
+18% +$4.97M
2019 Q2
29 quarters
CORZ icon
354
CALL
Core Scientific
CORZ
$4.17B
$30.6M 0.02%
1,916,900
+772,400
+67% +$15.2M
2024 Q1
10 quarters
TTWO icon
355
CALL
Take-Two Interactive
TTWO
$42B
$30.6M 0.02%
147,600
+7,400
+5% +$1.71M
2026 Q1
2 quarters
RKT icon
356
CALL
Rocket Companies
RKT
$40.6B
$30.5M 0.02%
2,650,800
+1,032,700
+64% +$14.1M
2020 Q3
24 quarters
OXY icon
357
PUT
Occidental Petroleum
OXY
$57.1B
$30.4M 0.02%
550,300
-154,100
-22% -$8.81M
2020 Q1
26 quarters
BP icon
358
CALL
BP
BP
$115B
$30.4M 0.02%
691,400
-347,300
-33% -$14.9M
2021 Q2
21 quarters
ECHO icon
359
PUT
EchoStar
ECHO
$30.1B
$30.4M 0.02%
339,800
-135,700
-29% -$12.3M
2023 Q3
12 quarters
MARA icon
360
CALL
Marathon Digital Holdings
MARA
$2.8B
$30.3M 0.02%
2,678,400
+113,100
+4% +$1.3M
2020 Q2
25 quarters
PEP icon
361
PUT
PepsiCo
PEP
$195B
$30M 0.02%
237,000
+19,300
+9% +$2.66M
2014 Q4
47 quarters
AXP icon
362
PUT
American Express
AXP
$218B
$29.9M 0.02%
98,400
+20,900
+27% +$6.98M
2015 Q1
46 quarters
BSX icon
363
CALL
Boston Scientific
BSX
$64.8B
$29.5M 0.02%
675,100
-198,100
-23% -$9.17M
2014 Q4
47 quarters
SOXL icon
364
Direxion Daily Semiconductor Bull 3X ETF
SOXL
$15.5B
$29.3M 0.02%
198,348
+60,201
+44% +$8.23M
2026 Q2
1 quarter
CCL icon
365
PUT
Carnival Corporation Ltd
CCL
$41.3B
$29.2M 0.02%
1,191,800
-903,500
-43% -$23.1M
2021 Q2
21 quarters
RIVN icon
366
CALL
Rivian
RIVN
$19.8B
$29.2M 0.02%
1,953,900
-19,000
-1% -$308K
2021 Q4
19 quarters
ZS icon
367
PUT
Zscaler
ZS
$31.6B
$28.6M 0.02%
143,200
-12,100
-8% -$2.06M
2018 Q2
33 quarters
SBUX icon
368
PUT
Starbucks
SBUX
$125B
$28.5M 0.02%
303,600
-241,700
-44% -$24.9M
2014 Q4
47 quarters
CCJ icon
369
PUT
Cameco
CCJ
$31.7B
$28.5M 0.02%
329,000
+140,800
+75% +$13.3M
2021 Q2
21 quarters
DE icon
370
PUT
Deere & Co
DE
$186B
$28.3M 0.02%
42,100
+10,800
+35% +$6.87M
2014 Q4
47 quarters
PAAS icon
371
CALL
Pan American Silver
PAAS
$16.5B
$28.2M 0.02%
619,900
-6,900
-1% -$329K
2015 Q3
44 quarters
DVN icon
372
CALL
Devon Energy
DVN
$49.8B
$28.2M 0.02%
611,600
-1,168,600
-66% -$53.6M
2021 Q2
21 quarters
AAL icon
373
CALL
American Airlines Group
AAL
$9.31B
$28.1M 0.02%
2,098,500
-834,300
-28% -$12.2M
2014 Q4
47 quarters
F icon
374
CALL
Ford
F
$49B
$27.8M 0.02%
2,307,700
-1,230,100
-35% -$17.1M
2014 Q4
47 quarters
ZS icon
375
CALL
Zscaler
ZS
$31.6B
$27.7M 0.02%
139,100
+8,200
+6% +$1.4M
2018 Q2
33 quarters
13 14
15
16 17

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Swiss National Bank
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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.