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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
-4.36%
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
$156B
AUM Growth
-$22.4B
Cap. Flow
-$7.93B
Cap. Flow %
-5.08%
Top 10 Hldgs %
50.56%
Holding
10,070
New
1,566
Increased
3,139
Reduced
3,654
Closed
1,547

Top Buys

Rank Stock Value
1
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$272M
2
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$99M
3
NVDA icon
NVIDIA
NVDA
+$89.9M
4
TSM icon
TSMC
TSM
+$87.7M
5
AMZN icon
Amazon
AMZN
+$61M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$518M
2
MSTR icon
Strategy Inc
MSTR
+$81.2M
3
BABA icon
Alibaba
BABA
+$66.7M
4
AMD icon
Advanced Micro Devices
AMD
+$44.3M
5
UBER icon
Uber
UBER
+$41.3M

Sector Composition

Rank Sector Weight
1 Technology 0.41%
2 Consumer Discretionary 0.22%
3 Healthcare 0.17%
4 Communication Services 0.15%
5 Financials 0.13%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
HNI icon
8951
CALL
HNI Corp
HNI
$3.01B
– –
-300
Closed -$15K
HNI icon
8952
PUT
HNI Corp
HNI
$3.01B
– –
-500
Closed -$25K
HOOK
8953
DELISTED
HOOKIPA Pharma
HOOK
– –
-121
Closed –
HRI icon
8954
Herc Holdings
HRI
$5.48B
– –
-315
Closed -$53.7K
HRTS icon
8955
Tema ETF Trust Tema Heart & Health ETF
HRTS
$54.6M
– –
-367
Closed -$10K
HRTX icon
8956
Heron Therapeutics
HRTX
$86M
– –
-7,498
Closed -$14.6K
HRZN icon
8957
CALL
Horizon Technology Finance
HRZN
$301M
– –
-1,400
Closed -$12K
HSIC icon
8958
Henry Schein
HSIC
$9.76B
– –
-64
Closed -$4.72K
HSII
8959
DELISTED
Heidrick & Struggles
HSII
– –
-94
Closed -$4K
HSII
8960
PUT
DELISTED
Heidrick & Struggles
HSII
– –
-300
Closed -$13K
HTBK
8961
CALL
DELISTED
Heritage Commerce
HTBK
– –
-900
Closed -$8K
HTOO icon
8962
Fusion Fuel Green
HTOO
$8.77M
– –
-71
Closed -$1K
HUBG icon
8963
HUB Group
HUBG
$2.99B
– –
-748
Closed -$31.2K
HUMA icon
8964
Humacyte
HUMA
$171M
– –
-96,175
Closed -$361K
HURN icon
8965
Huron Consulting
HURN
$1.82B
– –
-69
Closed -$8K
AGIG
8966
CALL
Abundia Global Impact Group
AGIG
$44M
– –
-990
Closed -$12K
AGIG
8967
PUT
Abundia Global Impact Group
AGIG
$44M
– –
-80
Closed -$1K
HY icon
8968
PUT
Hyster-Yale Materials Handling
HY
$595M
– –
-200
Closed -$10K
HYG icon
8969
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
$16.3B
– –
-306,276
Closed -$24.1M
HYPR icon
8970
CALL
Hyperfine
HYPR
$95.3M
– –
-14,200
Closed -$12K
HYPR icon
8971
Hyperfine
HYPR
$95.3M
$0 ﹤0.01%
+222
New +$228
PPLI
8972
People Inc
PPLI
$3.13B
– –
-8,567
Closed -$312K
IAG icon
8973
IAMGOLD
IAG
$8.62B
– –
-48,261
Closed -$285K
IAS
8974
PUT
DELISTED
Integral Ad Science
IAS
– –
-100
Closed -$1K
IBEX icon
8975
CALL
IBEX
IBEX
$447M
– –
-200
Closed -$4K
357 358
359
360 361

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Simplex Trading's Q1 2025 Portfolio in Review

As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.

Simplex Trading withdrew a net $7.93B in Q1 2025, closing 1,547 positions and reducing 3,654 holdings. Its most notable exit was Alibaba, an estimated $66.7M position sold in full.

By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.68% a quarter earlier, followed by Consumer Discretionary and Healthcare.

Against the trend, Simplex Trading opened a new position in iShares 20+ Year Treasury Bond ETF worth $278M.

  • Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
  • Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
  • Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
  • Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
  • Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
  • Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
  • Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.

Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.